CONFIG_DRAM_END configuration change from Richard Cochran

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@5038 7fd9a85b-ad96-42d3-883c-3090e2eb8679

171 files changed, 467 insertions, 836 deletions

diff --git a/nuttx/configs/amber/README.txt b/nuttx/configs/amber/README.txt
index e91ea38110..9ef22917e3 100644
--- a/nuttx/configs/amber/README.txt
+++ b/nuttx/configs/amber/README.txt
@@ -413,10 +413,6 @@ Amber Web Server Configuration Options
 
        CONFIG_DRAM_START=0x800100
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
        have LEDs
 
diff --git a/nuttx/configs/amber/hello/defconfig b/nuttx/configs/amber/hello/defconfig
index 2b56cc0039..828c2fbdc2 100644
--- a/nuttx/configs/amber/hello/defconfig
+++ b/nuttx/configs/amber/hello/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -82,7 +81,6 @@ CONFIG_ARCH_BOARD_AMBER=y
 CONFIG_BOARD_LOOPSPERMSEC=800
 CONFIG_DRAM_SIZE=4096
 CONFIG_DRAM_START=0x800100
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=y
 CONFIG_ARCH_IRQPRIO=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/avr32dev1/README.txt b/nuttx/configs/avr32dev1/README.txt
index fcd2d9727d..68d0192274 100755
--- a/nuttx/configs/avr32dev1/README.txt
+++ b/nuttx/configs/avr32dev1/README.txt
@@ -1,450 +1,446 @@
-README

-^^^^^^

-

-This is the README file for the NuttX port to the Atmel AVR32DEV1 board.

-

-Contents

-^^^^^^^^

-

- * GPIO Pin Configuration

- * Serial Connection

- * Toolchains

- * Development Environment

- * GNU Toolchains

- * IDEs

-   - Makefile Build

-   - Native Build

- * AVR32 Bootloader

-   - Boot Sequence

-   - Link Address

-   - Entering the ISP

-   - BatchISP

- * Reset

- * Make Tip

- * AVR32DEV1 Configuration Options

- * Configurations

-

-GPIO Pin Configuration

-^^^^^^^^^^^^^^^^^^^^^^

-

-The only GPIO pin usage is for LEDs (2) and Buttons (2):

-

-  PIN 13  PA7  LED1

-  PIN 14  PA8  LED2

-  PIN 24  PB2  KEY1

-  PIN 25  PB3  KEY2

-

-(See configs/avr32dev/src/avr32dev_internal.h).  And also for

-crystals (4), JTAG (1), and USB (1):

-

-  PIN 30  PA11 XIN32

-  PIN 31  PA12 XOUT32

-  PIN 35  PA15 EVTO (JTAG)

-  PIN 39  PA18 X1IN

-  PIN 40  PA19 X1OUT

-  PIN 61  PA26 ID (USB)

-

-All GPIO pins are brought out through connectors J1 (PINS 33-64)

-and J2 (PINS 1-32).

-

-NOTE:  There seems to be some difference in labeling for OSC0 and

-OSC1 between MCUZone.com and Atmel:

-

-  Oscillator pinout

-  -------------------------- --------------------

-  QFP48 QFP64 Pad Oscillator AVR32DEV1

-   PIN   PIN       PIN       LABEL

-  ----- ----- ---- --------- --------------------

-   30    39   PA18 XIN0      X1IN   (12MHz)

-         41   PA28 XIN1      PA28   (no crystal)

-   22    30   PA11 XIN32     XIN32  (32KHz)

-   31    40   PA19 XOUT0     X1OUT  (12Mhz)

-         42   PA29 XOUT1     PA29   (no crystal)

-   23    31   PA12 XOUT32    XOUT32 (32 Khz)

-  ----- ----- ---- --------- --------------------

-

-NOTE 1: These crystal inputs/outputs are analog signals and my

-assumption is that they need no pin multiplexing setting to

-enable them for the external crystal function.

-

-NOTE 2: There is no support for OSC1.

-

-NOTE 3: There are solder pads for the 32KHz OSC32, but the

-crystal is not populated on my board.  Therefore, the RTC will

-have to run from the (uncalibrated) RCOSC.

-

-Serial Connection

-^^^^^^^^^^^^^^^^^

-

-USART1 is the default USART1 used in the configuration files to

-provide a serial console (of course, that can be easily changed

-by editting the configuration file).  The AVR32DEV1 board has no

-RS-232 drivers or connectors on board.  I use an off-board MAX232

-module that I got on eBay (search for MAX232 if you want to find

-one).  I connect the MAX232 board as follows:

-

-In configs/avr32dev/include/board.h:

-

-  #define PINMUX_USART1_RXD   PINMUX_USART1_RXD_1

-  #define PINMUX_USART1_TXD   PINMUX_USART1_TXD_1

-

-In arch/avr/src/at32uc3/at32uc3b_pinmux.h:

-

-  #define PINMUX_USART1_RXD_1 (GPIO_PERIPH | GPIO_FUNCD | GPIO_PORTA | 17)

-  #define PINMUX_USART1_TXD_1 (GPIO_PERIPH | GPIO_FUNCA | GPIO_PORTA | 23)

-

-PA17 and PA23 are avaiable from the AVR32DEV1:

-

-  FUNC GPIO  PIN   Header 16X2 (J1) MX232 Board

-  ---- ----- ----- ---------------- ------------

-  RXD  PA17  PIN37 Pin 5            PIN4 RXD (5V TTL/CMOS)

-  TXD  PA23  PIN47 Pin 15           PIN3 TXD (5V TTL/CMOS)

-                                    PIN2 GND

-                                    PIN1 VCC (5V)

-

-  Voltage on GPIO Pins with respect to Ground for TCK, RESET_N, PA03-PA08,

-  PA11-PA12, PA18-PA19, PA28-PA31............................-0.3 to 3.6V

-  Other Pins ............................................... -0.3 to 5.5V

-

-  I get the 5V from another USB port (using the 5V power cable that normally

-  provides the extra current needed by my USB IDE drive).

-

-Development Environment

-^^^^^^^^^^^^^^^^^^^^^^^

-

-  Either Linux or Cygwin on Windows can be used for the development environment.

-  The source has been built only using the GNU toolchain (see below).  Other

-  toolchains will likely cause problems. Testing was performed using the Cygwin

-  environment.

-

-GNU Toolchains

-^^^^^^^^^^^^^^

-

-Atmel Toolchain:

-

-  The build logic in these directories assume that you are using the GNU

-  toolchain with the Atmel patches.  The patch file, pre-patched tool

-  sources,and pre-built binaries are available from the Atmel website.

-

-    CONFIG_AVR32_AVRTOOLSW=y  # Use the windows version

-    CONFIG_AVR32_AVRTOOLSL=y  # Ue the Linux version

-

-  NOTE: The NuttX builtroot cannot be used to build the AVR32 toolchain.

-  This is because the Atmel patches that add support for the AVR32 are not

-  included in the NuttX buildroot.

-

-WinAVR:

-

-  Another option for use under Windows is WinAVR:

-  http://sourceforge.net/projects/winavr/files/.  WinAVR includes the

-  AVR32 toolchain as well as the AVR toolchain and various support

-  libraries and header files.

-

-IDEs

-^^^^

-

-  NuttX is built using command-line make.  It can be used with an IDE, but some

-  effort will be required to create the project.

-  

-  Makefile Build

-  --------------

-  Under Eclipse, it is pretty easy to set up an "empty makefile project" and

-  simply use the NuttX makefile to build the system.  That is almost for free

-  under Linux.  Under Windows, you will need to set up the "Cygwin GCC" empty

-  makefile project in order to work with Windows (Google for "Eclipse Cygwin" -

-  there is a lot of help on the internet).

-

-  Native Build

-  ------------

-  Here are a few tips before you start that effort:

-

-  1) Select the toolchain that you will be using in your .config file

-  2) Start the NuttX build at least one time from the Cygwin command line

-     before trying to create your project.  This is necessary to create

-     certain auto-generated files and directories that will be needed.

-  3) Set up include pathes:  You will need include/, arch/avr/src/at32uc3,

-     arch/avr/src/common, arch/arm/src/avr, and sched/.

-  4) All assembly files need to have the definition option -D __ASSEMBLY__

-     on the command line.

-

-  Startup files will probably cause you some headaches.  The NuttX startup file

-  is arch/avr/src/avr3/up_nommuhead.S.

-

-AVR32 Bootloader

-^^^^^^^^^^^^^^^^

-

-  Boot Sequence

-  -------------

-  

-    "An AVR UC3 part having the bootloader programmed resets as any other

-     part at 80000000h. Bootloader execution begins here. The bootloader

-     first performs the boot process to know whether it should start the

-     USB DFU ISP or the application. If the tested conditions indicate

-     that the USB DFU ISP should be started, then execution continues in

-     the bootloader area, i.e. between 80000000h and 80002000h, else

-     the bootloader launches the application at 80002000h."

-  

-  Link Address

-  ------------

-

-  The linker scripts (ld.script) assume that you are using the DFU

-  bootloader.  The bootloader resides at 0x8000:0000 and so the ld.script

-  files link the application to execute after the bootloader at

-  0x8000:2000. To link so that NuttX boots directly without using the

-  bootloader, change the flash definition from:

-

-    flash (rxai!w)  : ORIGIN = 0x80002000, LENGTH = 256K - 8K

-

-  to:

-    flash (rxai!w)  : ORIGIN = 0x80000000, LENGTH = 256K

-

-  Or to use the MSC bootloader:

-

-    flash (rxai!w)  : ORIGIN = 0x80008000, LENGTH = 256K - 32K

-

-  Entering the ISP

-  ----------------

-

-  In order to use the USB port to download the FLASH(ISP), you need to

-  use the S3(PA13) to make CPU return to boot status. In this mode, the

-  on chip bootloader will run, making the ISP possible.

-

-  BatchISP

-  --------

-

-  Unlike other Atmel parts, the AVR32 will not work with the FLIP GUI

-  program.  Instead, you must use the command-line loader call BatchISP.

-  If need to download FLIP from the atmel.com website, install the USB

-  driver in the FLIP usb directory.  Then in the bin directory where

-  you installed FLIP, you will also find batchisp.exe.

-

-  NOTE: The AVR32DEV1 setenv.sh files will add the path to the BatchISP

-  bin directory to the Cygwin PATH variable.  If you use a different

-  version of FLIP or if you install FLIP in a different location, you

-  will need to modify the setenv.sh files.

-

-  Notes from "AVR32 UC3 USB DFU Bootloader" (doc7745.pdf)

-  

-  "To launch BatchISP, open a command prompt. Windows or Cygwin command

-   prompt can be used provided that the bin folder of the FLIP installation

-   directory is in the PATH (Windows’ or Cygwin’s) environment variable.

-   When running BatchISP on AT32UC3xxxxx, the target part has to be specified

-   with -device at32uc3xxxxx and the communication port with -hardware usb.

-   Commands can then be placed after -operation. These commands are executed

-   in order. BatchISP options can be placed in a text file invoked using

-   -cmdfile rather than on the command line.

-

-  "BatchISP works with an internal ISP buffer per target memory. These ISP

-   buffers can be filled from several sources. All target operations (program,

-   verify, read) are performed using these buffers."

- 

-  The following BatchISP command line will erase FLASH, write the nuttx binary

-  into FLASH, and reset the AVR32.  This command line is available in the

-  script config/avr32dev1/tools/doisp.sh:

-

-     batchisp -device at32uc3b0256 -hardware usb -operation erase f memory flash \

-     blankcheck loadbuffer nuttx.elf program verify start reset 0

-

-  "BatchISP main commands available on AT32UC3xxxxx are:

-  

-   - ASSERT { PASS | FAIL } changes the displayed results of the following

-     operations according to the expected behavior.

-   - ONFAIL { ASK | ABORT | RETRY | IGNORE } changes the interactive behavior

-     of BatchISP in case of failure.

-   - WAIT <Nsec> inserts a pause between two ISP operations.

-   - ECHO <comment> displays a message.

-   - ERASE F erases internal flash contents, except the bootloader.

-   - MEMORY { FLASH | SECURITY | CONFIGURATION | BOOTLOADER | SIGNATURE | USER }

-     selects a target memory on which to apply the following operations.

-   - ADDRANGE <addrMin> <addrMax> selects in the current target memory an

-     address range on which to apply the following operations.

-   - BLANKCHECK checks that the selected address range is erased.

-   - FILLBUFFER <data> fills the ISP buffer with a byte value.

-   - LOADBUFFER { <in_elffile> | <in_hexfile> } loads the ISP buffer from an

-     input file.

-   - PROGRAM programs the selected address range with the ISP buffer.

-   - VERIFY verifies that the selected address range has the same contents

-     as the ISP buffer.

-   - READ reads the selected address range to the ISP buffer.

-   - SAVEBUFFER <out_hexfile> { HEX386 | HEX86 } saves the ISP buffer to an

-      output file.

-   - START { RESET | NORESET } 0 starts the execution of the programmed

-     application with an optional hardware reset of the target.

-

-  "The AT32UC3xxxxx memories made available by BatchISP are:

-

-  - FLASH: This memory is the internal flash array of the target, including the

-    bootloader protected area. E.g. on AT32UC3A0512 (512-kB internal flash),

-    addresses from 0 to 0x7FFFF can be accessed in this memory.

-  - SECURITY: This memory contains only one byte. The least significant bit

-    of this byte reflects the value of the target Security bit which can only

-    be set to 1. Once set, the only accepted commands will be ERASE and START.

-    After an ERASE command, all commands are accepted until the end of the

-    non-volatile ISP session, even if the Security bit is set.

-  - CONFIGURATION: This memory contains one byte per target general-purpose

-    fuse bit.  The least significant bit of each byte reflects the value of

-    the corresponding GP fuse bit.

-  - BOOTLOADER: This memory contains three bytes concerning the ISP: the ISP

-    version in BCD format without the major version number (always 1), the

-    ISP ID0 and the ISP ID1.

-  - SIGNATURE: This memory contains four bytes concerning the part: the product

-    manufacturer ID, the product family ID, the product ID and the product

-    revision.

-  - USER: This memory is the internal flash User page of the target, with

-    addresses from 0 to 0x1FF.

-

-  "For further details about BatchISP commands, launch batchisp -h or see the

-   help files installed with FLIP ..."

-

-Reset

-^^^^^

-

-   I don't trust the reset button -- if you reset and something weird happens,

-   try a full power cycle.

-

-Make Tip

-^^^^^^^^

-

-   Because this build uses a native Windows toolchain and the native Windows

-   tools do not understand Cygwin's symbolic links, the NuttX make system does

-   something weird:  It copies the configuration directories instead of linking

-   to them (it could, perhaps, use the NTFS 'mklink' command, but it doesn't).

-

-   A consequence of this is that you can easily get confused when you edit

-   a file in one of the "linked" directories, re-build NuttX, and then not see your

-   changes when you run the program.  That is because build is still using the

-   version of the file in the copied directory, not your modified file! To work

-   around this annoying behavior, do the following when you re-build:

-   

-   make clean_context all <-- Remove and re-copy all of the directories, then make all

-   doisp.sh               <-- Load the code onto the board.

-

-AVR32DEV1 Configuration Options

-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

-

-    CONFIG_ARCH - Identifies the arch/ subdirectory.  This should

-       be set to:

-

-       CONFIG_ARCH=avr

-

-    CONFIG_ARCH_family - For use in C code:

-

-       CONFIG_ARCH_AVR=y

-

-    CONFIG_ARCH_architecture - For use in C code:

-

-       CONFIG_ARCH_AVR32=y

-

-    CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory

-

-       CONFIG_ARCH_CHIP=at32uc3

-

-    CONFIG_ARCH_CHIP_name - For use in C code to identify the exact

-       chip:

-

-       CONFIG_ARCH_CHIP_AT32UC3B0256

-

-    CONFIG_ARCH_BOARD - Identifies the configs subdirectory and

-       hence, the board that supports the particular chip or SoC.

-

-       CONFIG_ARCH_BOARD=avr32dev1 (for the AV32DEV1 board)

-

-    CONFIG_ARCH_BOARD_name - For use in C code

-

-       CONFIG_ARCH_BOARD_AVR32DEV1

-

-    CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation

-       of delay loops

-

-    CONFIG_ENDIAN_BIG - define if big endian (default is little

-       endian)

-

-    CONFIG_DRAM_SIZE - Describes the installed DRAM (SRAM in this case):

-

-       CONFIG_DRAM_SIZE=0x00010000 (64Kb)

-

-    CONFIG_DRAM_START - The start address of installed DRAM

-

-       CONFIG_DRAM_START=0x20000000

-

-    CONFIG_DRAM_END - Last address+1 of installed RAM

-

-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)

-

-    CONFIG_ARCH_IRQPRIO - The AT32UC3B0256 supports interrupt prioritization

-

-       CONFIG_ARCH_IRQPRIO=y

-

-    CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that

-       have LEDs

-

-    CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt

-       stack. If defined, this symbol is the size of the interrupt

-        stack in bytes.  If not defined, the user task stacks will be

-      used during interrupt handling.

-

-    CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions

-

-    CONFIG_ARCH_LEDS -  Use LEDs to show state. Unique to board architecture.

-

-    CONFIG_ARCH_CALIBRATION - Enables some build in instrumentation that

-       cause a 100 second delay during boot-up.  This 100 second delay

-       serves no purpose other than it allows you to calibratre

-       CONFIG_ARCH_LOOPSPERMSEC.  You simply use a stop watch to measure

-       the 100 second delay then adjust CONFIG_ARCH_LOOPSPERMSEC until

-       the delay actually is 100 seconds.

-

-  Individual subsystems can be enabled:

-  

-    CONFIG_AVR32_GPIOIRQ - GPIO interrupt support

-    CONFIG_AVR32_GPIOIRQSETA - Set of GPIOs on PORTA that support interrupts

-    CONFIG_AVR32_GPIOIRQSETB - Set of GPIOs on PORTB that support interrupts

-

-    CONFIG_AVR32_USARTn - Enable support for USARTn

-    CONFIG_AVR32_USARTn_RS232 - Configure USARTn as an RS232 interface.

-    CONFIG_AVR32_USARTn_SPI - Configure USARTn as an SPI interface.

-    CONFIG_AVR32_USARTn_RS485 - Configure USARTn as an RS485 interface.

-    CONFIG_AVR32_USARTn_MAN - Configure USARTn as an Manchester interface.

-    CONFIG_AVR32_USARTn_MODEM - Configure USARTn as an Modem interface.

-    CONFIG_AVR32_USARTn_IRDA - Configure USARTn as an IRDA interface.

-    CONFIG_AVR32_USARTn_ISO786 - Configure USARTn as an ISO786 interface.

-

-  AT32UC3B0256 specific device driver settings

-

-    CONFIG_USARTn_SERIAL_CONSOLE - selects the USARTn for the

-       console and ttys0 (default is the USART0).

-    CONFIG_USARTn_RXBUFSIZE - Characters are buffered as received.

-       This specific the size of the receive buffer

-    CONFIG_USARTn_TXBUFSIZE - Characters are buffered before

-       being sent.  This specific the size of the transmit buffer

-    CONFIG_USARTn_BAUD - The configure BAUD of the USART.  Must be

-    CONFIG_USARTn_BITS - The number of bits.  Must be either 7 or 8.

-    CONFIG_USARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity

-    CONFIG_USARTn_2STOP - Two stop bits

-

-Configurations

-^^^^^^^^^^^^^^

-

-Each Stellaris LM3S6965 Evaluation Kit configuration is maintained in a

-sudirectory and can be selected as follow:

-

-    cd tools

-    ./configure.sh avr32dev1/<subdir>

-    cd -

-    . ./setenv.sh

-

-Where <subdir> is one of the following:

-

-  nsh:

-    Configures the NuttShell (nsh) located at examples/nsh.  The

-    Configuration enables only the serial NSH interface.

-

-  ostest:

-    This configuration directory, performs a simple OS test using

-    examples/ostest.

-

-    NOTE: Round-robin scheduling is disabled in this test because

-    the RR test in examples/ostest declares data structures that

-    are too large for the poor little uc3 SRAM.

-

-

+README
+^^^^^^
+
+This is the README file for the NuttX port to the Atmel AVR32DEV1 board.
+
+Contents
+^^^^^^^^
+
+ * GPIO Pin Configuration
+ * Serial Connection
+ * Toolchains
+ * Development Environment
+ * GNU Toolchains
+ * IDEs
+   - Makefile Build
+   - Native Build
+ * AVR32 Bootloader
+   - Boot Sequence
+   - Link Address
+   - Entering the ISP
+   - BatchISP
+ * Reset
+ * Make Tip
+ * AVR32DEV1 Configuration Options
+ * Configurations
+
+GPIO Pin Configuration
+^^^^^^^^^^^^^^^^^^^^^^
+
+The only GPIO pin usage is for LEDs (2) and Buttons (2):
+
+  PIN 13  PA7  LED1
+  PIN 14  PA8  LED2
+  PIN 24  PB2  KEY1
+  PIN 25  PB3  KEY2
+
+(See configs/avr32dev/src/avr32dev_internal.h).  And also for
+crystals (4), JTAG (1), and USB (1):
+
+  PIN 30  PA11 XIN32
+  PIN 31  PA12 XOUT32
+  PIN 35  PA15 EVTO (JTAG)
+  PIN 39  PA18 X1IN
+  PIN 40  PA19 X1OUT
+  PIN 61  PA26 ID (USB)
+
+All GPIO pins are brought out through connectors J1 (PINS 33-64)
+and J2 (PINS 1-32).
+
+NOTE:  There seems to be some difference in labeling for OSC0 and
+OSC1 between MCUZone.com and Atmel:
+
+  Oscillator pinout
+  -------------------------- --------------------
+  QFP48 QFP64 Pad Oscillator AVR32DEV1
+   PIN   PIN       PIN       LABEL
+  ----- ----- ---- --------- --------------------
+   30    39   PA18 XIN0      X1IN   (12MHz)
+         41   PA28 XIN1      PA28   (no crystal)
+   22    30   PA11 XIN32     XIN32  (32KHz)
+   31    40   PA19 XOUT0     X1OUT  (12Mhz)
+         42   PA29 XOUT1     PA29   (no crystal)
+   23    31   PA12 XOUT32    XOUT32 (32 Khz)
+  ----- ----- ---- --------- --------------------
+
+NOTE 1: These crystal inputs/outputs are analog signals and my
+assumption is that they need no pin multiplexing setting to
+enable them for the external crystal function.
+
+NOTE 2: There is no support for OSC1.
+
+NOTE 3: There are solder pads for the 32KHz OSC32, but the
+crystal is not populated on my board.  Therefore, the RTC will
+have to run from the (uncalibrated) RCOSC.
+
+Serial Connection
+^^^^^^^^^^^^^^^^^
+
+USART1 is the default USART1 used in the configuration files to
+provide a serial console (of course, that can be easily changed
+by editting the configuration file).  The AVR32DEV1 board has no
+RS-232 drivers or connectors on board.  I use an off-board MAX232
+module that I got on eBay (search for MAX232 if you want to find
+one).  I connect the MAX232 board as follows:
+
+In configs/avr32dev/include/board.h:
+
+  #define PINMUX_USART1_RXD   PINMUX_USART1_RXD_1
+  #define PINMUX_USART1_TXD   PINMUX_USART1_TXD_1
+
+In arch/avr/src/at32uc3/at32uc3b_pinmux.h:
+
+  #define PINMUX_USART1_RXD_1 (GPIO_PERIPH | GPIO_FUNCD | GPIO_PORTA | 17)
+  #define PINMUX_USART1_TXD_1 (GPIO_PERIPH | GPIO_FUNCA | GPIO_PORTA | 23)
+
+PA17 and PA23 are avaiable from the AVR32DEV1:
+
+  FUNC GPIO  PIN   Header 16X2 (J1) MX232 Board
+  ---- ----- ----- ---------------- ------------
+  RXD  PA17  PIN37 Pin 5            PIN4 RXD (5V TTL/CMOS)
+  TXD  PA23  PIN47 Pin 15           PIN3 TXD (5V TTL/CMOS)
+                                    PIN2 GND
+                                    PIN1 VCC (5V)
+
+  Voltage on GPIO Pins with respect to Ground for TCK, RESET_N, PA03-PA08,
+  PA11-PA12, PA18-PA19, PA28-PA31............................-0.3 to 3.6V
+  Other Pins ............................................... -0.3 to 5.5V
+
+  I get the 5V from another USB port (using the 5V power cable that normally
+  provides the extra current needed by my USB IDE drive).
+
+Development Environment
+^^^^^^^^^^^^^^^^^^^^^^^
+
+  Either Linux or Cygwin on Windows can be used for the development environment.
+  The source has been built only using the GNU toolchain (see below).  Other
+  toolchains will likely cause problems. Testing was performed using the Cygwin
+  environment.
+
+GNU Toolchains
+^^^^^^^^^^^^^^
+
+Atmel Toolchain:
+
+  The build logic in these directories assume that you are using the GNU
+  toolchain with the Atmel patches.  The patch file, pre-patched tool
+  sources,and pre-built binaries are available from the Atmel website.
+
+    CONFIG_AVR32_AVRTOOLSW=y  # Use the windows version
+    CONFIG_AVR32_AVRTOOLSL=y  # Ue the Linux version
+
+  NOTE: The NuttX builtroot cannot be used to build the AVR32 toolchain.
+  This is because the Atmel patches that add support for the AVR32 are not
+  included in the NuttX buildroot.
+
+WinAVR:
+
+  Another option for use under Windows is WinAVR:
+  http://sourceforge.net/projects/winavr/files/.  WinAVR includes the
+  AVR32 toolchain as well as the AVR toolchain and various support
+  libraries and header files.
+
+IDEs
+^^^^
+
+  NuttX is built using command-line make.  It can be used with an IDE, but some
+  effort will be required to create the project.
+  
+  Makefile Build
+  --------------
+  Under Eclipse, it is pretty easy to set up an "empty makefile project" and
+  simply use the NuttX makefile to build the system.  That is almost for free
+  under Linux.  Under Windows, you will need to set up the "Cygwin GCC" empty
+  makefile project in order to work with Windows (Google for "Eclipse Cygwin" -
+  there is a lot of help on the internet).
+
+  Native Build
+  ------------
+  Here are a few tips before you start that effort:
+
+  1) Select the toolchain that you will be using in your .config file
+  2) Start the NuttX build at least one time from the Cygwin command line
+     before trying to create your project.  This is necessary to create
+     certain auto-generated files and directories that will be needed.
+  3) Set up include pathes:  You will need include/, arch/avr/src/at32uc3,
+     arch/avr/src/common, arch/arm/src/avr, and sched/.
+  4) All assembly files need to have the definition option -D __ASSEMBLY__
+     on the command line.
+
+  Startup files will probably cause you some headaches.  The NuttX startup file
+  is arch/avr/src/avr3/up_nommuhead.S.
+
+AVR32 Bootloader
+^^^^^^^^^^^^^^^^
+
+  Boot Sequence
+  -------------
+  
+    "An AVR UC3 part having the bootloader programmed resets as any other
+     part at 80000000h. Bootloader execution begins here. The bootloader
+     first performs the boot process to know whether it should start the
+     USB DFU ISP or the application. If the tested conditions indicate
+     that the USB DFU ISP should be started, then execution continues in
+     the bootloader area, i.e. between 80000000h and 80002000h, else
+     the bootloader launches the application at 80002000h."
+  
+  Link Address
+  ------------
+
+  The linker scripts (ld.script) assume that you are using the DFU
+  bootloader.  The bootloader resides at 0x8000:0000 and so the ld.script
+  files link the application to execute after the bootloader at
+  0x8000:2000. To link so that NuttX boots directly without using the
+  bootloader, change the flash definition from:
+
+    flash (rxai!w)  : ORIGIN = 0x80002000, LENGTH = 256K - 8K
+
+  to:
+    flash (rxai!w)  : ORIGIN = 0x80000000, LENGTH = 256K
+
+  Or to use the MSC bootloader:
+
+    flash (rxai!w)  : ORIGIN = 0x80008000, LENGTH = 256K - 32K
+
+  Entering the ISP
+  ----------------
+
+  In order to use the USB port to download the FLASH(ISP), you need to
+  use the S3(PA13) to make CPU return to boot status. In this mode, the
+  on chip bootloader will run, making the ISP possible.
+
+  BatchISP
+  --------
+
+  Unlike other Atmel parts, the AVR32 will not work with the FLIP GUI
+  program.  Instead, you must use the command-line loader call BatchISP.
+  If need to download FLIP from the atmel.com website, install the USB
+  driver in the FLIP usb directory.  Then in the bin directory where
+  you installed FLIP, you will also find batchisp.exe.
+
+  NOTE: The AVR32DEV1 setenv.sh files will add the path to the BatchISP
+  bin directory to the Cygwin PATH variable.  If you use a different
+  version of FLIP or if you install FLIP in a different location, you
+  will need to modify the setenv.sh files.
+
+  Notes from "AVR32 UC3 USB DFU Bootloader" (doc7745.pdf)
+  
+  "To launch BatchISP, open a command prompt. Windows or Cygwin command
+   prompt can be used provided that the bin folder of the FLIP installation
+   directory is in the PATH (Windows’ or Cygwin’s) environment variable.
+   When running BatchISP on AT32UC3xxxxx, the target part has to be specified
+   with -device at32uc3xxxxx and the communication port with -hardware usb.
+   Commands can then be placed after -operation. These commands are executed
+   in order. BatchISP options can be placed in a text file invoked using
+   -cmdfile rather than on the command line.
+
+  "BatchISP works with an internal ISP buffer per target memory. These ISP
+   buffers can be filled from several sources. All target operations (program,
+   verify, read) are performed using these buffers."
+ 
+  The following BatchISP command line will erase FLASH, write the nuttx binary
+  into FLASH, and reset the AVR32.  This command line is available in the
+  script config/avr32dev1/tools/doisp.sh:
+
+     batchisp -device at32uc3b0256 -hardware usb -operation erase f memory flash \
+     blankcheck loadbuffer nuttx.elf program verify start reset 0
+
+  "BatchISP main commands available on AT32UC3xxxxx are:
+  
+   - ASSERT { PASS | FAIL } changes the displayed results of the following
+     operations according to the expected behavior.
+   - ONFAIL { ASK | ABORT | RETRY | IGNORE } changes the interactive behavior
+     of BatchISP in case of failure.
+   - WAIT <Nsec> inserts a pause between two ISP operations.
+   - ECHO <comment> displays a message.
+   - ERASE F erases internal flash contents, except the bootloader.
+   - MEMORY { FLASH | SECURITY | CONFIGURATION | BOOTLOADER | SIGNATURE | USER }
+     selects a target memory on which to apply the following operations.
+   - ADDRANGE <addrMin> <addrMax> selects in the current target memory an
+     address range on which to apply the following operations.
+   - BLANKCHECK checks that the selected address range is erased.
+   - FILLBUFFER <data> fills the ISP buffer with a byte value.
+   - LOADBUFFER { <in_elffile> | <in_hexfile> } loads the ISP buffer from an
+     input file.
+   - PROGRAM programs the selected address range with the ISP buffer.
+   - VERIFY verifies that the selected address range has the same contents
+     as the ISP buffer.
+   - READ reads the selected address range to the ISP buffer.
+   - SAVEBUFFER <out_hexfile> { HEX386 | HEX86 } saves the ISP buffer to an
+      output file.
+   - START { RESET | NORESET } 0 starts the execution of the programmed
+     application with an optional hardware reset of the target.
+
+  "The AT32UC3xxxxx memories made available by BatchISP are:
+
+  - FLASH: This memory is the internal flash array of the target, including the
+    bootloader protected area. E.g. on AT32UC3A0512 (512-kB internal flash),
+    addresses from 0 to 0x7FFFF can be accessed in this memory.
+  - SECURITY: This memory contains only one byte. The least significant bit
+    of this byte reflects the value of the target Security bit which can only
+    be set to 1. Once set, the only accepted commands will be ERASE and START.
+    After an ERASE command, all commands are accepted until the end of the
+    non-volatile ISP session, even if the Security bit is set.
+  - CONFIGURATION: This memory contains one byte per target general-purpose
+    fuse bit.  The least significant bit of each byte reflects the value of
+    the corresponding GP fuse bit.
+  - BOOTLOADER: This memory contains three bytes concerning the ISP: the ISP
+    version in BCD format without the major version number (always 1), the
+    ISP ID0 and the ISP ID1.
+  - SIGNATURE: This memory contains four bytes concerning the part: the product
+    manufacturer ID, the product family ID, the product ID and the product
+    revision.
+  - USER: This memory is the internal flash User page of the target, with
+    addresses from 0 to 0x1FF.
+
+  "For further details about BatchISP commands, launch batchisp -h or see the
+   help files installed with FLIP ..."
+
+Reset
+^^^^^
+
+   I don't trust the reset button -- if you reset and something weird happens,
+   try a full power cycle.
+
+Make Tip
+^^^^^^^^
+
+   Because this build uses a native Windows toolchain and the native Windows
+   tools do not understand Cygwin's symbolic links, the NuttX make system does
+   something weird:  It copies the configuration directories instead of linking
+   to them (it could, perhaps, use the NTFS 'mklink' command, but it doesn't).
+
+   A consequence of this is that you can easily get confused when you edit
+   a file in one of the "linked" directories, re-build NuttX, and then not see your
+   changes when you run the program.  That is because build is still using the
+   version of the file in the copied directory, not your modified file! To work
+   around this annoying behavior, do the following when you re-build:
+   
+   make clean_context all <-- Remove and re-copy all of the directories, then make all
+   doisp.sh               <-- Load the code onto the board.
+
+AVR32DEV1 Configuration Options
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+    CONFIG_ARCH - Identifies the arch/ subdirectory.  This should
+       be set to:
+
+       CONFIG_ARCH=avr
+
+    CONFIG_ARCH_family - For use in C code:
+
+       CONFIG_ARCH_AVR=y
+
+    CONFIG_ARCH_architecture - For use in C code:
+
+       CONFIG_ARCH_AVR32=y
+
+    CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
+
+       CONFIG_ARCH_CHIP=at32uc3
+
+    CONFIG_ARCH_CHIP_name - For use in C code to identify the exact
+       chip:
+
+       CONFIG_ARCH_CHIP_AT32UC3B0256
+
+    CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
+       hence, the board that supports the particular chip or SoC.
+
+       CONFIG_ARCH_BOARD=avr32dev1 (for the AV32DEV1 board)
+
+    CONFIG_ARCH_BOARD_name - For use in C code
+
+       CONFIG_ARCH_BOARD_AVR32DEV1
+
+    CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation
+       of delay loops
+
+    CONFIG_ENDIAN_BIG - define if big endian (default is little
+       endian)
+
+    CONFIG_DRAM_SIZE - Describes the installed DRAM (SRAM in this case):
+
+       CONFIG_DRAM_SIZE=0x00010000 (64Kb)
+
+    CONFIG_DRAM_START - The start address of installed DRAM
+
+       CONFIG_DRAM_START=0x20000000
+
+    CONFIG_ARCH_IRQPRIO - The AT32UC3B0256 supports interrupt prioritization
+
+       CONFIG_ARCH_IRQPRIO=y
+
+    CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
+       have LEDs
+
+    CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
+       stack. If defined, this symbol is the size of the interrupt
+        stack in bytes.  If not defined, the user task stacks will be
+      used during interrupt handling.
+
+    CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
+
+    CONFIG_ARCH_LEDS -  Use LEDs to show state. Unique to board architecture.
+
+    CONFIG_ARCH_CALIBRATION - Enables some build in instrumentation that
+       cause a 100 second delay during boot-up.  This 100 second delay
+       serves no purpose other than it allows you to calibratre
+       CONFIG_ARCH_LOOPSPERMSEC.  You simply use a stop watch to measure
+       the 100 second delay then adjust CONFIG_ARCH_LOOPSPERMSEC until
+       the delay actually is 100 seconds.
+
+  Individual subsystems can be enabled:
+  
+    CONFIG_AVR32_GPIOIRQ - GPIO interrupt support
+    CONFIG_AVR32_GPIOIRQSETA - Set of GPIOs on PORTA that support interrupts
+    CONFIG_AVR32_GPIOIRQSETB - Set of GPIOs on PORTB that support interrupts
+
+    CONFIG_AVR32_USARTn - Enable support for USARTn
+    CONFIG_AVR32_USARTn_RS232 - Configure USARTn as an RS232 interface.
+    CONFIG_AVR32_USARTn_SPI - Configure USARTn as an SPI interface.
+    CONFIG_AVR32_USARTn_RS485 - Configure USARTn as an RS485 interface.
+    CONFIG_AVR32_USARTn_MAN - Configure USARTn as an Manchester interface.
+    CONFIG_AVR32_USARTn_MODEM - Configure USARTn as an Modem interface.
+    CONFIG_AVR32_USARTn_IRDA - Configure USARTn as an IRDA interface.
+    CONFIG_AVR32_USARTn_ISO786 - Configure USARTn as an ISO786 interface.
+
+  AT32UC3B0256 specific device driver settings
+
+    CONFIG_USARTn_SERIAL_CONSOLE - selects the USARTn for the
+       console and ttys0 (default is the USART0).
+    CONFIG_USARTn_RXBUFSIZE - Characters are buffered as received.
+       This specific the size of the receive buffer
+    CONFIG_USARTn_TXBUFSIZE - Characters are buffered before
+       being sent.  This specific the size of the transmit buffer
+    CONFIG_USARTn_BAUD - The configure BAUD of the USART.  Must be
+    CONFIG_USARTn_BITS - The number of bits.  Must be either 7 or 8.
+    CONFIG_USARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity
+    CONFIG_USARTn_2STOP - Two stop bits
+
+Configurations
+^^^^^^^^^^^^^^
+
+Each Stellaris LM3S6965 Evaluation Kit configuration is maintained in a
+sudirectory and can be selected as follow:
+
+    cd tools
+    ./configure.sh avr32dev1/<subdir>
+    cd -
+    . ./setenv.sh
+
+Where <subdir> is one of the following:
+
+  nsh:
+    Configures the NuttShell (nsh) located at examples/nsh.  The
+    Configuration enables only the serial NSH interface.
+
+  ostest:
+    This configuration directory, performs a simple OS test using
+    examples/ostest.
+
+    NOTE: Round-robin scheduling is disabled in this test because
+    the RR test in examples/ostest declares data structures that
+    are too large for the poor little uc3 SRAM.
+
+
diff --git a/nuttx/configs/avr32dev1/nsh/defconfig b/nuttx/configs/avr32dev1/nsh/defconfig
index afbd08fae7..99f3a538ef 100755
--- a/nuttx/configs/avr32dev1/nsh/defconfig
+++ b/nuttx/configs/avr32dev1/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -83,7 +82,6 @@ CONFIG_ARCH_BOARD_AVR32DEV1=y
 CONFIG_BOARD_LOOPSPERMSEC=1140
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x00000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=y
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/avr32dev1/ostest/defconfig b/nuttx/configs/avr32dev1/ostest/defconfig
index 59c5080db7..c00113c06b 100755
--- a/nuttx/configs/avr32dev1/ostest/defconfig
+++ b/nuttx/configs/avr32dev1/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -83,7 +82,6 @@ CONFIG_ARCH_BOARD_AVR32DEV1=y
 CONFIG_BOARD_LOOPSPERMSEC=1140
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x00000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=y
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/c5471evm/README.txt b/nuttx/configs/c5471evm/README.txt
index 1e127d5658..1329ee6d82 100644
--- a/nuttx/configs/c5471evm/README.txt
+++ b/nuttx/configs/c5471evm/README.txt
@@ -73,8 +73,6 @@ ARM/C5471-specific Configuration Options
 	CONFIG_ROM_VECTORS - should be defined for the C5471 because the
 	   interrupt vectors are in ROM
 
-	CONFIG_DRAM_END - the size of installed DRAM. Unique to c5471
-
 	CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
 	   have LEDs
 
diff --git a/nuttx/configs/c5471evm/httpd/defconfig b/nuttx/configs/c5471evm/httpd/defconfig
index eb09501691..4b9c656c1c 100644
--- a/nuttx/configs/c5471evm/httpd/defconfig
+++ b/nuttx/configs/c5471evm/httpd/defconfig
@@ -50,7 +50,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
 # CONFIG_ROM_VECTORS - unique to c5471
-# CONFIG_DRAM_END - the size of installed DRAM.
 #   Unique to c5471
 # CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to c5471.
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
@@ -68,11 +67,13 @@ CONFIG_ARCH_BOARD=c5471evm
 CONFIG_ARCH_BOARD_C5471EVM=y
 CONFIG_BOARD_LOOPSPERMSEC=1250
 CONFIG_ROM_VECTORS=n
-CONFIG_DRAM_END=0x11000000
 CONFIG_ARCH_LEDS=y
 CONFIG_ARCH_INTERRUPTSTACK=0
 CONFIG_ARCH_STACKDUMP=y
 
+CONFIG_DRAM_START=0
+CONFIG_DRAM_SIZE=0x11000000
+
 #
 # C5471 specific device driver settings
 #
diff --git a/nuttx/configs/c5471evm/nettest/defconfig b/nuttx/configs/c5471evm/nettest/defconfig
index 96d221cf1c..dac94afe4a 100644
--- a/nuttx/configs/c5471evm/nettest/defconfig
+++ b/nuttx/configs/c5471evm/nettest/defconfig
@@ -50,7 +50,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
 # CONFIG_ROM_VECTORS - unique to c5471
-# CONFIG_DRAM_END - the size of installed DRAM.
 #   Unique to c5471
 # CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to c5471.
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
@@ -68,11 +67,13 @@ CONFIG_ARCH_BOARD=c5471evm
 CONFIG_ARCH_BOARD_C5471EVM=y
 CONFIG_BOARD_LOOPSPERMSEC=1250
 CONFIG_ROM_VECTORS=n
-CONFIG_DRAM_END=0x11000000
 CONFIG_ARCH_LEDS=y
 CONFIG_ARCH_INTERRUPTSTACK=0
 CONFIG_ARCH_STACKDUMP=y
 
+CONFIG_DRAM_START=0
+CONFIG_DRAM_SIZE=0x11000000
+
 #
 # General build options
 #
diff --git a/nuttx/configs/c5471evm/nsh/defconfig b/nuttx/configs/c5471evm/nsh/defconfig
index dedbd8bdee..67384f5993 100644
--- a/nuttx/configs/c5471evm/nsh/defconfig
+++ b/nuttx/configs/c5471evm/nsh/defconfig
@@ -50,7 +50,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
 # CONFIG_ROM_VECTORS - unique to c5471
-# CONFIG_DRAM_END - the size of installed DRAM.
 #   Unique to c5471
 # CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to c5471.
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
@@ -68,11 +67,13 @@ CONFIG_ARCH_BOARD=c5471evm
 CONFIG_ARCH_BOARD_C5471EVM=y
 CONFIG_BOARD_LOOPSPERMSEC=1250
 CONFIG_ROM_VECTORS=n
-CONFIG_DRAM_END=0x11000000
 CONFIG_ARCH_LEDS=y
 CONFIG_ARCH_INTERRUPTSTACK=0
 CONFIG_ARCH_STACKDUMP=y
 
+CONFIG_DRAM_START=0
+CONFIG_DRAM_SIZE=0x11000000
+
 #
 # C5471 specific device driver settings
 #
diff --git a/nuttx/configs/c5471evm/ostest/defconfig b/nuttx/configs/c5471evm/ostest/defconfig
index f24a607f13..3b57c80422 100644
--- a/nuttx/configs/c5471evm/ostest/defconfig
+++ b/nuttx/configs/c5471evm/ostest/defconfig
@@ -50,7 +50,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
 # CONFIG_ROM_VECTORS - unique to c5471
-# CONFIG_DRAM_END - the size of installed DRAM.
 #   Unique to c5471
 # CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to c5471.
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
@@ -68,11 +67,13 @@ CONFIG_ARCH_BOARD=c5471evm
 CONFIG_ARCH_BOARD_C5471EVM=y
 CONFIG_BOARD_LOOPSPERMSEC=1250
 CONFIG_ROM_VECTORS=n
-CONFIG_DRAM_END=0x11000000
 CONFIG_ARCH_LEDS=y
 CONFIG_ARCH_INTERRUPTSTACK=0
 CONFIG_ARCH_STACKDUMP=y
 
+CONFIG_DRAM_START=0
+CONFIG_DRAM_SIZE=0x11000000
+
 #
 # C5471 specific device driver settings
 #
diff --git a/nuttx/configs/compal_e88/nsh_highram/defconfig b/nuttx/configs/compal_e88/nsh_highram/defconfig
index 1e63f5a1dd..f8894c92a3 100644
--- a/nuttx/configs/compal_e88/nsh_highram/defconfig
+++ b/nuttx/configs/compal_e88/nsh_highram/defconfig
@@ -50,7 +50,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
 # CONFIG_ROM_VECTORS - unique to c5471
-# CONFIG_DRAM_END - the size of installed DRAM.
 #   Unique to c5471
 # CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to c5471.
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
@@ -68,11 +67,13 @@ CONFIG_ARCH_BOARD=compal_e88
 CONFIG_ARCH_BOARD_COMPALE88=y
 CONFIG_BOARD_LOOPSPERMSEC=1250
 CONFIG_ROM_VECTORS=n
-CONFIG_DRAM_END=0x00840000
 CONFIG_ARCH_LEDS=n
 CONFIG_ARCH_INTERRUPTSTACK=1024
 CONFIG_ARCH_STACKDUMP=y
 
+CONFIG_DRAM_START=0
+CONFIG_DRAM_SIZE=0x00840000
+
 #
 # C5471 specific device driver settings
 #
diff --git a/nuttx/configs/compal_e99/nsh_compalram/defconfig b/nuttx/configs/compal_e99/nsh_compalram/defconfig
index f391e2a65e..cfac844722 100644
--- a/nuttx/configs/compal_e99/nsh_compalram/defconfig
+++ b/nuttx/configs/compal_e99/nsh_compalram/defconfig
@@ -50,7 +50,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
 # CONFIG_ROM_VECTORS - unique to c5471
-# CONFIG_DRAM_END - the size of installed DRAM.
 #   Unique to c5471
 # CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to c5471.
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
@@ -68,7 +67,6 @@ CONFIG_ARCH_BOARD=compal_e99
 CONFIG_ARCH_BOARD_COMPALE99=y
 CONFIG_BOARD_LOOPSPERMSEC=1250
 CONFIG_ROM_VECTORS=n
-CONFIG_DRAM_END=0x00840000
 CONFIG_MM_REGIONS=2
 CONFIG_HEAP2_START=0x01000000
 CONFIG_HEAP2_END=0x01200000
@@ -76,6 +74,9 @@ CONFIG_ARCH_LEDS=n
 CONFIG_ARCH_INTERRUPTSTACK=1024
 CONFIG_ARCH_STACKDUMP=y
 
+CONFIG_DRAM_START=0
+CONFIG_DRAM_SIZE=0x00840000
+
 #
 # C5471 specific device driver settings
 #
diff --git a/nuttx/configs/compal_e99/nsh_highram/defconfig b/nuttx/configs/compal_e99/nsh_highram/defconfig
index f538cbb74b..ad1e47b026 100644
--- a/nuttx/configs/compal_e99/nsh_highram/defconfig
+++ b/nuttx/configs/compal_e99/nsh_highram/defconfig
@@ -50,7 +50,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
 # CONFIG_ROM_VECTORS - unique to c5471
-# CONFIG_DRAM_END - the size of installed DRAM.
 #   Unique to c5471
 # CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to c5471.
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
@@ -68,7 +67,6 @@ CONFIG_ARCH_BOARD=compal_e99
 CONFIG_ARCH_BOARD_COMPALE99=y
 CONFIG_BOARD_LOOPSPERMSEC=1250
 CONFIG_ROM_VECTORS=n
-CONFIG_DRAM_END=0x00840000
 CONFIG_MM_REGIONS=2
 CONFIG_HEAP2_START=0x01000000
 CONFIG_HEAP2_END=0x01200000
@@ -76,6 +74,9 @@ CONFIG_ARCH_LEDS=n
 CONFIG_ARCH_INTERRUPTSTACK=1024
 CONFIG_ARCH_STACKDUMP=y
 
+CONFIG_DRAM_START=0
+CONFIG_DRAM_SIZE=0x00840000
+
 #
 # C5471 specific device driver settings
 #
diff --git a/nuttx/configs/demo9s12ne64/README.txt b/nuttx/configs/demo9s12ne64/README.txt
index 58fb44434a..0b8f776901 100755
--- a/nuttx/configs/demo9s12ne64/README.txt
+++ b/nuttx/configs/demo9s12ne64/README.txt
@@ -296,8 +296,6 @@ HCS12/DEMO9S12NEC64-specific Configuration Options
 
 	CONFIG_DRAM_START - The start address of installed RAM
 
-	CONFIG_DRAM_END - Should be (CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
 	   have LEDs
 
diff --git a/nuttx/configs/demo9s12ne64/ostest/defconfig b/nuttx/configs/demo9s12ne64/ostest/defconfig
index b12b56e66b..3ec27669ce 100755
--- a/nuttx/configs/demo9s12ne64/ostest/defconfig
+++ b/nuttx/configs/demo9s12ne64/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed RAM.
 # CONFIG_DRAM_START - The start address of RAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -82,7 +81,6 @@ CONFIG_ARCH_BOARD_DEMOS92S12NEC64=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=y
 CONFIG_ARCH_IRQPRIO=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/eagle100/README.txt b/nuttx/configs/eagle100/README.txt
index 7979ca16c5..28d51b518f 100644
--- a/nuttx/configs/eagle100/README.txt
+++ b/nuttx/configs/eagle100/README.txt
@@ -252,10 +252,6 @@ Eagle100-specific Configuration Options
 
 	   CONFIG_DRAM_START=0x20000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The LM3S6918 supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/eagle100/httpd/defconfig b/nuttx/configs/eagle100/httpd/defconfig
index 5c0b8b28a9..ec2db7d36e 100644
--- a/nuttx/configs/eagle100/httpd/defconfig
+++ b/nuttx/configs/eagle100/httpd/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6918 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -78,7 +77,6 @@ CONFIG_ARCH_BOARD_EAGLE100=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/eagle100/nettest/defconfig b/nuttx/configs/eagle100/nettest/defconfig
index bd225e7af1..ebc5be23ab 100644
--- a/nuttx/configs/eagle100/nettest/defconfig
+++ b/nuttx/configs/eagle100/nettest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6918 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -78,7 +77,6 @@ CONFIG_ARCH_BOARD_EAGLE100=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/eagle100/nsh/defconfig b/nuttx/configs/eagle100/nsh/defconfig
index 7f97b19653..b99367e647 100644
--- a/nuttx/configs/eagle100/nsh/defconfig
+++ b/nuttx/configs/eagle100/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6918 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -78,7 +77,6 @@ CONFIG_ARCH_BOARD_EAGLE100=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/eagle100/nxflat/defconfig b/nuttx/configs/eagle100/nxflat/defconfig
index 49221f4fab..db0557a52c 100644
--- a/nuttx/configs/eagle100/nxflat/defconfig
+++ b/nuttx/configs/eagle100/nxflat/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6918 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -78,7 +77,6 @@ CONFIG_ARCH_BOARD_EAGLE100=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/eagle100/ostest/defconfig b/nuttx/configs/eagle100/ostest/defconfig
index 1aae6ce3ae..f4048f08bf 100644
--- a/nuttx/configs/eagle100/ostest/defconfig
+++ b/nuttx/configs/eagle100/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6918 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -78,7 +77,6 @@ CONFIG_ARCH_BOARD_EAGLE100=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/eagle100/thttpd/defconfig b/nuttx/configs/eagle100/thttpd/defconfig
index 8241fa7bed..6ed845d699 100644
--- a/nuttx/configs/eagle100/thttpd/defconfig
+++ b/nuttx/configs/eagle100/thttpd/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6918 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -78,7 +77,6 @@ CONFIG_ARCH_BOARD_EAGLE100=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/ekk-lm3s9b96/README.txt b/nuttx/configs/ekk-lm3s9b96/README.txt
index 9c4e1ba695..a6dcab87de 100644
--- a/nuttx/configs/ekk-lm3s9b96/README.txt
+++ b/nuttx/configs/ekk-lm3s9b96/README.txt
@@ -274,10 +274,6 @@ Stellaris EKK-LM3S9B96 Evaluation Kit Configuration Options
 
        CONFIG_DRAM_START=0x20000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_IRQPRIO - The LM3S6918 supports interrupt prioritization
 
        CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/ekk-lm3s9b96/nsh/defconfig b/nuttx/configs/ekk-lm3s9b96/nsh/defconfig
index e7eacb2f91..382de7f2fe 100644
--- a/nuttx/configs/ekk-lm3s9b96/nsh/defconfig
+++ b/nuttx/configs/ekk-lm3s9b96/nsh/defconfig
@@ -52,7 +52,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6B96 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -77,7 +76,6 @@ CONFIG_ARCH_BOARD_EKKLM3S9B96=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00018000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/ekk-lm3s9b96/ostest/defconfig b/nuttx/configs/ekk-lm3s9b96/ostest/defconfig
index bb7d02647e..6cfedb59fd 100644
--- a/nuttx/configs/ekk-lm3s9b96/ostest/defconfig
+++ b/nuttx/configs/ekk-lm3s9b96/ostest/defconfig
@@ -52,7 +52,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6965 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -77,7 +76,6 @@ CONFIG_ARCH_BOARD_EKKLM3S9B96=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00018000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/hymini-stm32v/README.txt b/nuttx/configs/hymini-stm32v/README.txt
index 43a4127964..ddb62e84e6 100755
--- a/nuttx/configs/hymini-stm32v/README.txt
+++ b/nuttx/configs/hymini-stm32v/README.txt
@@ -319,10 +319,6 @@ HY-Mini specific Configuration Options
 
 	   CONFIG_DRAM_START=0x20000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The STM32F103V supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/hymini-stm32v/buttons/defconfig b/nuttx/configs/hymini-stm32v/buttons/defconfig
index 80099c1333..af9de4a125 100644
--- a/nuttx/configs/hymini-stm32v/buttons/defconfig
+++ b/nuttx/configs/hymini-stm32v/buttons/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -80,7 +79,6 @@ CONFIG_ARCH_BOARD_HYMINI_STM32V=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x0000C000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/hymini-stm32v/nsh/defconfig b/nuttx/configs/hymini-stm32v/nsh/defconfig
index e11f809d54..b8ad080fe5 100755
--- a/nuttx/configs/hymini-stm32v/nsh/defconfig
+++ b/nuttx/configs/hymini-stm32v/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_HYMINI_STM32V=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x0000C000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/hymini-stm32v/nsh2/defconfig b/nuttx/configs/hymini-stm32v/nsh2/defconfig
index fea9830fb2..0b0cbfda42 100644
--- a/nuttx/configs/hymini-stm32v/nsh2/defconfig
+++ b/nuttx/configs/hymini-stm32v/nsh2/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_HYMINI_STM32V=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x0000C000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/hymini-stm32v/nx/defconfig b/nuttx/configs/hymini-stm32v/nx/defconfig
index a53fbba415..f32afd1b91 100644
--- a/nuttx/configs/hymini-stm32v/nx/defconfig
+++ b/nuttx/configs/hymini-stm32v/nx/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_HYMINI_STM32V=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x0000C000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/hymini-stm32v/nxlines/defconfig b/nuttx/configs/hymini-stm32v/nxlines/defconfig
index 4d7533817f..1439b4d559 100644
--- a/nuttx/configs/hymini-stm32v/nxlines/defconfig
+++ b/nuttx/configs/hymini-stm32v/nxlines/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -80,7 +79,6 @@ CONFIG_ARCH_BOARD_HYMINI_STM32V=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x0000C000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/hymini-stm32v/usbserial/defconfig b/nuttx/configs/hymini-stm32v/usbserial/defconfig
index 37dcb860ce..c1abc15dc6 100755
--- a/nuttx/configs/hymini-stm32v/usbserial/defconfig
+++ b/nuttx/configs/hymini-stm32v/usbserial/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -80,7 +79,6 @@ CONFIG_ARCH_BOARD_HYMINI_STM32V=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x0000C000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/hymini-stm32v/usbstorage/defconfig b/nuttx/configs/hymini-stm32v/usbstorage/defconfig
index 4c52c48392..b783a1f6ae 100755
--- a/nuttx/configs/hymini-stm32v/usbstorage/defconfig
+++ b/nuttx/configs/hymini-stm32v/usbstorage/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -80,7 +79,6 @@ CONFIG_ARCH_BOARD_HYMINI_STM32V=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x0000C000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/kwikstik-k40/README.txt b/nuttx/configs/kwikstik-k40/README.txt
index 285b2e0999..ea6d9dee6b 100644
--- a/nuttx/configs/kwikstik-k40/README.txt
+++ b/nuttx/configs/kwikstik-k40/README.txt
@@ -337,10 +337,6 @@ KwikStik-K40-specific Configuration Options
 
 	   CONFIG_DRAM_START=0x20000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The Kinetis K40 supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/kwikstik-k40/ostest/defconfig b/nuttx/configs/kwikstik-k40/ostest/defconfig
index d5a077c42b..709a5585aa 100755
--- a/nuttx/configs/kwikstik-k40/ostest/defconfig
+++ b/nuttx/configs/kwikstik-k40/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The K40X256VLQ100 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_KWIKSTIK_K40=y
 CONFIG_BOARD_LOOPSPERMSEC=9535
 CONFIG_DRAM_START=0x1fff8000
 CONFIG_DRAM_SIZE= 0x00010000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lincoln60/README.txt b/nuttx/configs/lincoln60/README.txt
index 6ad37d363c..d94666d901 100644
--- a/nuttx/configs/lincoln60/README.txt
+++ b/nuttx/configs/lincoln60/README.txt
@@ -239,10 +239,6 @@ Lincoln 60 Configuration Options
 
 	   CONFIG_DRAM_START=0x10000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/lincoln60/nsh/defconfig b/nuttx/configs/lincoln60/nsh/defconfig
index 1aec842782..4f3219e6d4 100644
--- a/nuttx/configs/lincoln60/nsh/defconfig
+++ b/nuttx/configs/lincoln60/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LINCOLN60=y
 CONFIG_BOARD_LOOPSPERMSEC=7982
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lincoln60/ostest/defconfig b/nuttx/configs/lincoln60/ostest/defconfig
index 6be405482e..b3087f3a72 100644
--- a/nuttx/configs/lincoln60/ostest/defconfig
+++ b/nuttx/configs/lincoln60/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LINCOLN60=y
 CONFIG_BOARD_LOOPSPERMSEC=8111
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lm3s6432-s2e/README.txt b/nuttx/configs/lm3s6432-s2e/README.txt
index 8cba45260b..a5b0b566b2 100644
--- a/nuttx/configs/lm3s6432-s2e/README.txt
+++ b/nuttx/configs/lm3s6432-s2e/README.txt
@@ -268,10 +268,6 @@ Stellaris MDL-S2E Reference Design Configuration Options
 
 	   CONFIG_DRAM_START=0x20000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The LM3S6918 supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/lm3s6432-s2e/nsh/defconfig b/nuttx/configs/lm3s6432-s2e/nsh/defconfig
index a8a39f2d11..b10e2a176f 100644
--- a/nuttx/configs/lm3s6432-s2e/nsh/defconfig
+++ b/nuttx/configs/lm3s6432-s2e/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6432 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -76,7 +75,6 @@ CONFIG_ARCH_BOARD_LM3S6432S2E=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lm3s6432-s2e/ostest/defconfig b/nuttx/configs/lm3s6432-s2e/ostest/defconfig
index 09d0ab1d2a..1e73dff550 100644
--- a/nuttx/configs/lm3s6432-s2e/ostest/defconfig
+++ b/nuttx/configs/lm3s6432-s2e/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6432 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -76,7 +75,6 @@ CONFIG_ARCH_BOARD_LM3S6432S2E=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lm3s6965-ek/README.txt b/nuttx/configs/lm3s6965-ek/README.txt
index 5f122d03a6..5b26b41c81 100755
--- a/nuttx/configs/lm3s6965-ek/README.txt
+++ b/nuttx/configs/lm3s6965-ek/README.txt
@@ -336,10 +336,6 @@ Stellaris LM3S6965 Evaluation Kit Configuration Options
 
 	   CONFIG_DRAM_START=0x20000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The LM3S6918 supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/lm3s6965-ek/nsh/defconfig b/nuttx/configs/lm3s6965-ek/nsh/defconfig
index 2621c81473..e84f1b137f 100755
--- a/nuttx/configs/lm3s6965-ek/nsh/defconfig
+++ b/nuttx/configs/lm3s6965-ek/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6965 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -76,7 +75,6 @@ CONFIG_ARCH_BOARD_LM3S6965EK=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lm3s6965-ek/nx/defconfig b/nuttx/configs/lm3s6965-ek/nx/defconfig
index c3dd32ee41..4152534462 100755
--- a/nuttx/configs/lm3s6965-ek/nx/defconfig
+++ b/nuttx/configs/lm3s6965-ek/nx/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6965 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -76,7 +75,6 @@ CONFIG_ARCH_BOARD_LM3S6965EK=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lm3s6965-ek/ostest/defconfig b/nuttx/configs/lm3s6965-ek/ostest/defconfig
index eac76216e0..6206284638 100755
--- a/nuttx/configs/lm3s6965-ek/ostest/defconfig
+++ b/nuttx/configs/lm3s6965-ek/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S6965 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -76,7 +75,6 @@ CONFIG_ARCH_BOARD_LM3S6965EK=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lm3s8962-ek/README.txt b/nuttx/configs/lm3s8962-ek/README.txt
index 796f602341..c1e0b9fea4 100755
--- a/nuttx/configs/lm3s8962-ek/README.txt
+++ b/nuttx/configs/lm3s8962-ek/README.txt
@@ -320,10 +320,6 @@ Stellaris LM3S8962 Evaluation Kit Configuration Options
 
 	   CONFIG_DRAM_START=0x20000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The LM3S6918 supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/lm3s8962-ek/nsh/defconfig b/nuttx/configs/lm3s8962-ek/nsh/defconfig
index c1cb66690b..cab96f28e5 100755
--- a/nuttx/configs/lm3s8962-ek/nsh/defconfig
+++ b/nuttx/configs/lm3s8962-ek/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S8962 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -76,7 +75,6 @@ CONFIG_ARCH_BOARD_LM3S8962EK=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lm3s8962-ek/nx/defconfig b/nuttx/configs/lm3s8962-ek/nx/defconfig
index 1fc5306dc7..8336207a8d 100755
--- a/nuttx/configs/lm3s8962-ek/nx/defconfig
+++ b/nuttx/configs/lm3s8962-ek/nx/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S8962 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -76,7 +75,6 @@ CONFIG_ARCH_BOARD_LM3S8962EK=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lm3s8962-ek/ostest/defconfig b/nuttx/configs/lm3s8962-ek/ostest/defconfig
index 4fe57412cd..9baeaf7803 100755
--- a/nuttx/configs/lm3s8962-ek/ostest/defconfig
+++ b/nuttx/configs/lm3s8962-ek/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LM3S8962 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -76,7 +75,6 @@ CONFIG_ARCH_BOARD_LM3S8962EK=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lpc4330-xplorer/README.txt b/nuttx/configs/lpc4330-xplorer/README.txt
index 4cd867c32b..c9dd08ac5a 100644
--- a/nuttx/configs/lpc4330-xplorer/README.txt
+++ b/nuttx/configs/lpc4330-xplorer/README.txt
@@ -666,10 +666,6 @@ LPC4330-Xplorer Configuration Options
 
        CONFIG_DRAM_START=0x10000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_IRQPRIO - The LPC43xx supports interrupt prioritization
 
        CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/lpc4330-xplorer/nsh/defconfig b/nuttx/configs/lpc4330-xplorer/nsh/defconfig
index d168a947a7..3fdb53ad45 100644
--- a/nuttx/configs/lpc4330-xplorer/nsh/defconfig
+++ b/nuttx/configs/lpc4330-xplorer/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The Cortex-M4 supports interrupt prioritization
 # CONFIG_ARCH_FPU - The Cortex-M4 supports a floating point unit (FPU)
 #   (But, unfortunately, most versions of GCC do not support it).
@@ -84,7 +83,6 @@ CONFIG_ARCH_BOARD_LPC4330_XPLORER=y
 CONFIG_BOARD_LOOPSPERMSEC=18535
 CONFIG_DRAM_SIZE=(72*1024)
 CONFIG_DRAM_START=0x10080000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/lpc4330-xplorer/ostest/defconfig b/nuttx/configs/lpc4330-xplorer/ostest/defconfig
index ddf27ee72f..40ceb025f2 100644
--- a/nuttx/configs/lpc4330-xplorer/ostest/defconfig
+++ b/nuttx/configs/lpc4330-xplorer/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The Cortex-M4 supports interrupt prioritization
 # CONFIG_ARCH_FPU - The Cortex-M4 supports a floating point unit (FPU)
 #   (But, unfortunately, most versions of GCC do not support it).
@@ -84,7 +83,6 @@ CONFIG_ARCH_BOARD_LPC4330_XPLORER=y
 CONFIG_BOARD_LOOPSPERMSEC=18535
 CONFIG_DRAM_SIZE=(72*1024)
 CONFIG_DRAM_START=0x10080000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/lpcxpresso-lpc1768/README.txt b/nuttx/configs/lpcxpresso-lpc1768/README.txt
index 5632d0e827..402d528816 100755
--- a/nuttx/configs/lpcxpresso-lpc1768/README.txt
+++ b/nuttx/configs/lpcxpresso-lpc1768/README.txt
@@ -568,10 +568,6 @@ LPCXpresso Configuration Options
 
        CONFIG_DRAM_START=0x10000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 
        CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/lpcxpresso-lpc1768/dhcpd/defconfig b/nuttx/configs/lpcxpresso-lpc1768/dhcpd/defconfig
index ce4f45162f..564d7c7964 100755
--- a/nuttx/configs/lpcxpresso-lpc1768/dhcpd/defconfig
+++ b/nuttx/configs/lpcxpresso-lpc1768/dhcpd/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPCXPRESSO=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lpcxpresso-lpc1768/nsh/defconfig b/nuttx/configs/lpcxpresso-lpc1768/nsh/defconfig
index 18d1f5c73a..e1376f7bc7 100755
--- a/nuttx/configs/lpcxpresso-lpc1768/nsh/defconfig
+++ b/nuttx/configs/lpcxpresso-lpc1768/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPCXPRESSO=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lpcxpresso-lpc1768/nx/defconfig b/nuttx/configs/lpcxpresso-lpc1768/nx/defconfig
index a9415d3db8..07851a6284 100755
--- a/nuttx/configs/lpcxpresso-lpc1768/nx/defconfig
+++ b/nuttx/configs/lpcxpresso-lpc1768/nx/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPCXPRESSO=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lpcxpresso-lpc1768/ostest/defconfig b/nuttx/configs/lpcxpresso-lpc1768/ostest/defconfig
index 9dacfef1c6..027cdc0dbb 100755
--- a/nuttx/configs/lpcxpresso-lpc1768/ostest/defconfig
+++ b/nuttx/configs/lpcxpresso-lpc1768/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPCXPRESSO=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lpcxpresso-lpc1768/thttpd/defconfig b/nuttx/configs/lpcxpresso-lpc1768/thttpd/defconfig
index 081310a2b2..76b0d97819 100755
--- a/nuttx/configs/lpcxpresso-lpc1768/thttpd/defconfig
+++ b/nuttx/configs/lpcxpresso-lpc1768/thttpd/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPCXPRESSO=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/lpcxpresso-lpc1768/usbstorage/defconfig b/nuttx/configs/lpcxpresso-lpc1768/usbstorage/defconfig
index 344dde798f..ffc2a276f0 100755
--- a/nuttx/configs/lpcxpresso-lpc1768/usbstorage/defconfig
+++ b/nuttx/configs/lpcxpresso-lpc1768/usbstorage/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPCXPRESSO=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/mbed/README.txt b/nuttx/configs/mbed/README.txt
index 0b98d90853..b649230651 100755
--- a/nuttx/configs/mbed/README.txt
+++ b/nuttx/configs/mbed/README.txt
@@ -209,10 +209,6 @@ mbed Configuration Options
 
 	   CONFIG_DRAM_START=0x10000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/mbed/hidkbd/defconfig b/nuttx/configs/mbed/hidkbd/defconfig
index db15a9d212..4b15b76ad7 100644
--- a/nuttx/configs/mbed/hidkbd/defconfig
+++ b/nuttx/configs/mbed/hidkbd/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_MBED=y
 CONFIG_BOARD_LOOPSPERMSEC=7982
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/mbed/nsh/defconfig b/nuttx/configs/mbed/nsh/defconfig
index 058606a09f..d0b8cf43c7 100755
--- a/nuttx/configs/mbed/nsh/defconfig
+++ b/nuttx/configs/mbed/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_MBED=y
 CONFIG_BOARD_LOOPSPERMSEC=7982
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/mcu123-lpc214x/README.txt b/nuttx/configs/mcu123-lpc214x/README.txt
index 35afa9ac82..7c760caa21 100644
--- a/nuttx/configs/mcu123-lpc214x/README.txt
+++ b/nuttx/configs/mcu123-lpc214x/README.txt
@@ -259,8 +259,6 @@ ARM/LPC214X-specific Configuration Options
 
 	CONFIG_DRAM_START - The start address of installed RAM
 
-	CONFIG_DRAM_END - Should be (CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
 	   have LEDs
 
diff --git a/nuttx/configs/mcu123-lpc214x/composite/defconfig b/nuttx/configs/mcu123-lpc214x/composite/defconfig
index 701d1e91f5..43da96fdf2 100644
--- a/nuttx/configs/mcu123-lpc214x/composite/defconfig
+++ b/nuttx/configs/mcu123-lpc214x/composite/defconfig
@@ -69,7 +69,6 @@ CONFIG_BOARD_LOOPSPERMSEC=3270
 CONFIG_ARCH_LEDS=y
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x40000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_INTERRUPTSTACK=1024
 CONFIG_ARCH_STACKDUMP=y
 
diff --git a/nuttx/configs/mcu123-lpc214x/nsh/defconfig b/nuttx/configs/mcu123-lpc214x/nsh/defconfig
index 934825cb3d..3a7bfddb98 100644
--- a/nuttx/configs/mcu123-lpc214x/nsh/defconfig
+++ b/nuttx/configs/mcu123-lpc214x/nsh/defconfig
@@ -69,7 +69,6 @@ CONFIG_BOARD_LOOPSPERMSEC=3270
 CONFIG_ARCH_LEDS=y
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x40000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_INTERRUPTSTACK=0
 CONFIG_ARCH_STACKDUMP=y
 
diff --git a/nuttx/configs/mcu123-lpc214x/ostest/defconfig b/nuttx/configs/mcu123-lpc214x/ostest/defconfig
index 8540617ee0..5a6107ce32 100644
--- a/nuttx/configs/mcu123-lpc214x/ostest/defconfig
+++ b/nuttx/configs/mcu123-lpc214x/ostest/defconfig
@@ -69,7 +69,6 @@ CONFIG_BOARD_LOOPSPERMSEC=3270
 CONFIG_ARCH_LEDS=y
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x40000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_INTERRUPTSTACK=0
 CONFIG_ARCH_STACKDUMP=y
 
diff --git a/nuttx/configs/mcu123-lpc214x/usbserial/defconfig b/nuttx/configs/mcu123-lpc214x/usbserial/defconfig
index 84ee234b73..19063f108f 100644
--- a/nuttx/configs/mcu123-lpc214x/usbserial/defconfig
+++ b/nuttx/configs/mcu123-lpc214x/usbserial/defconfig
@@ -69,7 +69,6 @@ CONFIG_BOARD_LOOPSPERMSEC=3270
 CONFIG_ARCH_LEDS=y
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x40000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_INTERRUPTSTACK=1024
 CONFIG_ARCH_STACKDUMP=y
 
diff --git a/nuttx/configs/mcu123-lpc214x/usbstorage/defconfig b/nuttx/configs/mcu123-lpc214x/usbstorage/defconfig
index ea968df7b3..f43eeda3fe 100644
--- a/nuttx/configs/mcu123-lpc214x/usbstorage/defconfig
+++ b/nuttx/configs/mcu123-lpc214x/usbstorage/defconfig
@@ -69,7 +69,6 @@ CONFIG_BOARD_LOOPSPERMSEC=3270
 CONFIG_ARCH_LEDS=y
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x40000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_INTERRUPTSTACK=1024
 CONFIG_ARCH_STACKDUMP=y
 
diff --git a/nuttx/configs/micropendous3/README.txt b/nuttx/configs/micropendous3/README.txt
index 1a72edc288..e7b2041aa5 100644
--- a/nuttx/configs/micropendous3/README.txt
+++ b/nuttx/configs/micropendous3/README.txt
@@ -432,10 +432,6 @@ Micropendous3 Configuration Options
 
        CONFIG_DRAM_START=0x800100
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
        have LEDs
 
diff --git a/nuttx/configs/micropendous3/hello/defconfig b/nuttx/configs/micropendous3/hello/defconfig
index 46d70f510e..2f7c9fa7d2 100644
--- a/nuttx/configs/micropendous3/hello/defconfig
+++ b/nuttx/configs/micropendous3/hello/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -82,7 +81,6 @@ CONFIG_ARCH_BOARD_MICROPENDOUS3=y
 CONFIG_BOARD_LOOPSPERMSEC=(8*108)
 CONFIG_DRAM_SIZE=(4*1024)
 CONFIG_DRAM_START=0x800100
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=y
 CONFIG_ARCH_IRQPRIO=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/mirtoo/README.txt b/nuttx/configs/mirtoo/README.txt
index 24f6314ef0..b2d0c5790d 100644
--- a/nuttx/configs/mirtoo/README.txt
+++ b/nuttx/configs/mirtoo/README.txt
@@ -698,10 +698,6 @@ PIC32MX Configuration Options
 
        CONFIG_DRAM_START=0xa0000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_IRQPRIO - The PIC32MXx supports interrupt prioritization
 
        CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/mirtoo/nsh/defconfig b/nuttx/configs/mirtoo/nsh/defconfig
index 779398a20b..646375671b 100644
--- a/nuttx/configs/mirtoo/nsh/defconfig
+++ b/nuttx/configs/mirtoo/nsh/defconfig
@@ -52,7 +52,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -92,7 +91,6 @@ CONFIG_ARCH_BOARD_MIRTOO=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/mirtoo/nxffs/defconfig b/nuttx/configs/mirtoo/nxffs/defconfig
index af8d0d0b0f..f208034757 100644
--- a/nuttx/configs/mirtoo/nxffs/defconfig
+++ b/nuttx/configs/mirtoo/nxffs/defconfig
@@ -52,7 +52,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -92,7 +91,6 @@ CONFIG_ARCH_BOARD_MIRTOO=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/mirtoo/ostest/defconfig b/nuttx/configs/mirtoo/ostest/defconfig
index e76d81258b..bba530c831 100644
--- a/nuttx/configs/mirtoo/ostest/defconfig
+++ b/nuttx/configs/mirtoo/ostest/defconfig
@@ -52,7 +52,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -92,7 +91,6 @@ CONFIG_ARCH_BOARD_MIRTOO=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/ne64badge/README.txt b/nuttx/configs/ne64badge/README.txt
index d1a5a904c1..48a19264e5 100755
--- a/nuttx/configs/ne64badge/README.txt
+++ b/nuttx/configs/ne64badge/README.txt
@@ -403,8 +403,6 @@ HCS12/NE64BADGE-specific Configuration Options
 
 	CONFIG_DRAM_START - The start address of installed RAM
 
-	CONFIG_DRAM_END - Should be (CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
 	   have LEDs
 
diff --git a/nuttx/configs/ne64badge/ostest/defconfig b/nuttx/configs/ne64badge/ostest/defconfig
index de6e00d85e..f420b3976d 100755
--- a/nuttx/configs/ne64badge/ostest/defconfig
+++ b/nuttx/configs/ne64badge/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed RAM.
 # CONFIG_DRAM_START - The start address of RAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -82,7 +81,6 @@ CONFIG_ARCH_BOARD_NE64BADGE=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=y
 CONFIG_ARCH_IRQPRIO=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/nucleus2g/README.txt b/nuttx/configs/nucleus2g/README.txt
index df4776301c..81bd2fe65d 100755
--- a/nuttx/configs/nucleus2g/README.txt
+++ b/nuttx/configs/nucleus2g/README.txt
@@ -321,10 +321,6 @@ Nucleus 2G Configuration Options
 
 	   CONFIG_DRAM_START=0x10000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/nucleus2g/nsh/defconfig b/nuttx/configs/nucleus2g/nsh/defconfig
index 8001f0e87f..607eac73ca 100755
--- a/nuttx/configs/nucleus2g/nsh/defconfig
+++ b/nuttx/configs/nucleus2g/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_NUCLEUS2G=y
 CONFIG_BOARD_LOOPSPERMSEC=7982
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/nucleus2g/ostest/defconfig b/nuttx/configs/nucleus2g/ostest/defconfig
index b488dd8de5..3363ffbc1c 100755
--- a/nuttx/configs/nucleus2g/ostest/defconfig
+++ b/nuttx/configs/nucleus2g/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_NUCLEUS2G=y
 CONFIG_BOARD_LOOPSPERMSEC=7982
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/nucleus2g/usbserial/defconfig b/nuttx/configs/nucleus2g/usbserial/defconfig
index aa48558a46..01a8bd970d 100755
--- a/nuttx/configs/nucleus2g/usbserial/defconfig
+++ b/nuttx/configs/nucleus2g/usbserial/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_NUCLEUS2G=y
 CONFIG_BOARD_LOOPSPERMSEC=7982
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/nucleus2g/usbstorage/defconfig b/nuttx/configs/nucleus2g/usbstorage/defconfig
index de87daa053..bc29d45cc1 100755
--- a/nuttx/configs/nucleus2g/usbstorage/defconfig
+++ b/nuttx/configs/nucleus2g/usbstorage/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_NUCLEUS2G=y
 CONFIG_BOARD_LOOPSPERMSEC=7982
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/olimex-lpc1766stk/README.txt b/nuttx/configs/olimex-lpc1766stk/README.txt
index b81826e301..19cf66167e 100755
--- a/nuttx/configs/olimex-lpc1766stk/README.txt
+++ b/nuttx/configs/olimex-lpc1766stk/README.txt
@@ -617,10 +617,6 @@ Olimex LPC1766-STK Configuration Options
 
 	   CONFIG_DRAM_START=0x10000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/olimex-lpc1766stk/ftpc/defconfig b/nuttx/configs/olimex-lpc1766stk/ftpc/defconfig
index 221fe83713..40c98ed970 100755
--- a/nuttx/configs/olimex-lpc1766stk/ftpc/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/ftpc/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPC1766STK=y
 CONFIG_BOARD_LOOPSPERMSEC=8111
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/olimex-lpc1766stk/hidkbd/defconfig b/nuttx/configs/olimex-lpc1766stk/hidkbd/defconfig
index 6365a1720d..bc773c2d65 100755
--- a/nuttx/configs/olimex-lpc1766stk/hidkbd/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/hidkbd/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPC1766STK=y
 CONFIG_BOARD_LOOPSPERMSEC=8111
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/olimex-lpc1766stk/nettest/defconfig b/nuttx/configs/olimex-lpc1766stk/nettest/defconfig
index 8c0b87b3ff..f7c971d9f2 100755
--- a/nuttx/configs/olimex-lpc1766stk/nettest/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/nettest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPC1766STK=y
 CONFIG_BOARD_LOOPSPERMSEC=8111
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/olimex-lpc1766stk/nsh/defconfig b/nuttx/configs/olimex-lpc1766stk/nsh/defconfig
index b234b77a1b..90b4af8cd2 100755
--- a/nuttx/configs/olimex-lpc1766stk/nsh/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPC1766STK=y
 CONFIG_BOARD_LOOPSPERMSEC=8111
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/olimex-lpc1766stk/nx/defconfig b/nuttx/configs/olimex-lpc1766stk/nx/defconfig
index 696ee655cf..5a5525c7f4 100755
--- a/nuttx/configs/olimex-lpc1766stk/nx/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/nx/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPC1766STK=y
 CONFIG_BOARD_LOOPSPERMSEC=8111
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/olimex-lpc1766stk/ostest/defconfig b/nuttx/configs/olimex-lpc1766stk/ostest/defconfig
index 2628aa1fa2..c44d800e17 100755
--- a/nuttx/configs/olimex-lpc1766stk/ostest/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPC1766STK=y
 CONFIG_BOARD_LOOPSPERMSEC=8111
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/olimex-lpc1766stk/slip-httpd/defconfig b/nuttx/configs/olimex-lpc1766stk/slip-httpd/defconfig
index 0a9bae2c80..dcde1987e2 100755
--- a/nuttx/configs/olimex-lpc1766stk/slip-httpd/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/slip-httpd/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPC1766STK=y
 CONFIG_BOARD_LOOPSPERMSEC=8111
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/olimex-lpc1766stk/thttpd/defconfig b/nuttx/configs/olimex-lpc1766stk/thttpd/defconfig
index 82b4e8ebf6..eadb386299 100755
--- a/nuttx/configs/olimex-lpc1766stk/thttpd/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/thttpd/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPC1766STK=y
 CONFIG_BOARD_LOOPSPERMSEC=8111
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/olimex-lpc1766stk/usbserial/defconfig b/nuttx/configs/olimex-lpc1766stk/usbserial/defconfig
index 2e2049cf83..5adb89207f 100755
--- a/nuttx/configs/olimex-lpc1766stk/usbserial/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/usbserial/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPC1766STK=y
 CONFIG_BOARD_LOOPSPERMSEC=8111
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/olimex-lpc1766stk/usbstorage/defconfig b/nuttx/configs/olimex-lpc1766stk/usbstorage/defconfig
index 75b1612699..ac2a4a3844 100755
--- a/nuttx/configs/olimex-lpc1766stk/usbstorage/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/usbstorage/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPC1766STK=y
 CONFIG_BOARD_LOOPSPERMSEC=8111
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/olimex-lpc1766stk/wlan/defconfig b/nuttx/configs/olimex-lpc1766stk/wlan/defconfig
index b8583e81db..d0f80b550a 100755
--- a/nuttx/configs/olimex-lpc1766stk/wlan/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/wlan/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_LPC1766STK=y
 CONFIG_BOARD_LOOPSPERMSEC=8111
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0x10000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/olimex-lpc2378/nsh/defconfig b/nuttx/configs/olimex-lpc2378/nsh/defconfig
index fc9f29e295..b029dbc757 100755
--- a/nuttx/configs/olimex-lpc2378/nsh/defconfig
+++ b/nuttx/configs/olimex-lpc2378/nsh/defconfig
@@ -78,7 +78,6 @@ CONFIG_BOARD_LOOPSPERMSEC=3270
 CONFIG_ARCH_LEDS=y
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x40000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_INTERRUPTSTACK=
 CONFIG_ARCH_STACKDUMP=y
 
diff --git a/nuttx/configs/olimex-lpc2378/ostest/defconfig b/nuttx/configs/olimex-lpc2378/ostest/defconfig
index c83e92a681..f971212b5a 100755
--- a/nuttx/configs/olimex-lpc2378/ostest/defconfig
+++ b/nuttx/configs/olimex-lpc2378/ostest/defconfig
@@ -78,7 +78,6 @@ CONFIG_BOARD_LOOPSPERMSEC=3270
 CONFIG_ARCH_LEDS=y
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x40000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_INTERRUPTSTACK=
 CONFIG_ARCH_STACKDUMP=y
 
diff --git a/nuttx/configs/olimex-strp711/nettest/defconfig b/nuttx/configs/olimex-strp711/nettest/defconfig
index f740b18aed..6af2cb17ad 100755
--- a/nuttx/configs/olimex-strp711/nettest/defconfig
+++ b/nuttx/configs/olimex-strp711/nettest/defconfig
@@ -79,7 +79,6 @@ CONFIG_ARCH_LEDS=y
 CONFIG_ARCH_BUTTONS=y
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_INTERRUPTSTACK=0
 CONFIG_ARCH_STACKDUMP=y
 
diff --git a/nuttx/configs/olimex-strp711/nsh/defconfig b/nuttx/configs/olimex-strp711/nsh/defconfig
index c279dd75b7..85b4c503af 100644
--- a/nuttx/configs/olimex-strp711/nsh/defconfig
+++ b/nuttx/configs/olimex-strp711/nsh/defconfig
@@ -79,7 +79,6 @@ CONFIG_ARCH_LEDS=y
 CONFIG_ARCH_BUTTONS=y
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_INTERRUPTSTACK=0
 CONFIG_ARCH_STACKDUMP=y
 
diff --git a/nuttx/configs/olimex-strp711/ostest/defconfig b/nuttx/configs/olimex-strp711/ostest/defconfig
index 412c69367e..250a68ad2f 100644
--- a/nuttx/configs/olimex-strp711/ostest/defconfig
+++ b/nuttx/configs/olimex-strp711/ostest/defconfig
@@ -79,7 +79,6 @@ CONFIG_ARCH_LEDS=y
 CONFIG_ARCH_BUTTONS=y
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_INTERRUPTSTACK=0
 CONFIG_ARCH_STACKDUMP=y
 
diff --git a/nuttx/configs/pcblogic-pic32mx/README.txt b/nuttx/configs/pcblogic-pic32mx/README.txt
index 37836bc588..c15bd45a0e 100644
--- a/nuttx/configs/pcblogic-pic32mx/README.txt
+++ b/nuttx/configs/pcblogic-pic32mx/README.txt
@@ -384,10 +384,6 @@ PIC32MX Configuration Options
 
        CONFIG_DRAM_START=0xa0000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_IRQPRIO - The PIC32MXx supports interrupt prioritization
 
        CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/pcblogic-pic32mx/nsh/defconfig b/nuttx/configs/pcblogic-pic32mx/nsh/defconfig
index 5386fac86d..e5f0a29096 100644
--- a/nuttx/configs/pcblogic-pic32mx/nsh/defconfig
+++ b/nuttx/configs/pcblogic-pic32mx/nsh/defconfig
@@ -52,7 +52,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -92,7 +91,6 @@ CONFIG_ARCH_BOARD_PCBLOGICPIC32MX=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/pcblogic-pic32mx/ostest/defconfig b/nuttx/configs/pcblogic-pic32mx/ostest/defconfig
index 89f88bae87..802ab48ccf 100644
--- a/nuttx/configs/pcblogic-pic32mx/ostest/defconfig
+++ b/nuttx/configs/pcblogic-pic32mx/ostest/defconfig
@@ -52,7 +52,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -92,7 +91,6 @@ CONFIG_ARCH_BOARD_PCBLOGICPIC32MX=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/pic32-starterkit/README.txt b/nuttx/configs/pic32-starterkit/README.txt
index e8c62bf0f0..31d84798c0 100644
--- a/nuttx/configs/pic32-starterkit/README.txt
+++ b/nuttx/configs/pic32-starterkit/README.txt
@@ -831,10 +831,6 @@ PIC32MX Configuration Options
 
        CONFIG_DRAM_START=0xa0000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_IRQPRIO - The PIC32MXx supports interrupt prioritization
 
        CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/pic32-starterkit/nsh/defconfig b/nuttx/configs/pic32-starterkit/nsh/defconfig
index 6eb4f4cc6b..bdfeb770d9 100644
--- a/nuttx/configs/pic32-starterkit/nsh/defconfig
+++ b/nuttx/configs/pic32-starterkit/nsh/defconfig
@@ -54,7 +54,6 @@
 #   the delay actually is 100 seconds.
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -91,7 +90,6 @@ CONFIG_ARCH_BOARD_PIC32_STARTERKIT=y
 CONFIG_BOARD_LOOPSPERMSEC=7245
 CONFIG_DRAM_SIZE=(128*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/pic32-starterkit/nsh2/defconfig b/nuttx/configs/pic32-starterkit/nsh2/defconfig
index 2af37faf9e..f3e754b7e4 100644
--- a/nuttx/configs/pic32-starterkit/nsh2/defconfig
+++ b/nuttx/configs/pic32-starterkit/nsh2/defconfig
@@ -54,7 +54,6 @@
 #   the delay actually is 100 seconds.
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -91,7 +90,6 @@ CONFIG_ARCH_BOARD_PIC32_STARTERKIT=y
 CONFIG_BOARD_LOOPSPERMSEC=7245
 CONFIG_DRAM_SIZE=(128*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/pic32-starterkit/ostest/defconfig b/nuttx/configs/pic32-starterkit/ostest/defconfig
index a8bb1af9fb..4f5c9d005a 100644
--- a/nuttx/configs/pic32-starterkit/ostest/defconfig
+++ b/nuttx/configs/pic32-starterkit/ostest/defconfig
@@ -54,7 +54,6 @@
 #   the delay actually is 100 seconds.
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -91,7 +90,6 @@ CONFIG_ARCH_BOARD_PIC32_STARTERKIT=y
 CONFIG_BOARD_LOOPSPERMSEC=7245
 CONFIG_DRAM_SIZE=(128*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/pic32mx7mmb/README.txt b/nuttx/configs/pic32mx7mmb/README.txt
index 5c079d2046..adf83e2f4d 100644
--- a/nuttx/configs/pic32mx7mmb/README.txt
+++ b/nuttx/configs/pic32mx7mmb/README.txt
@@ -409,10 +409,6 @@ PIC32MX Configuration Options
 
        CONFIG_DRAM_START=0xa0000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_IRQPRIO - The PIC32MXx supports interrupt prioritization
 
        CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/pic32mx7mmb/nsh/defconfig b/nuttx/configs/pic32mx7mmb/nsh/defconfig
index a9d2370079..412e0a2dff 100644
--- a/nuttx/configs/pic32mx7mmb/nsh/defconfig
+++ b/nuttx/configs/pic32mx7mmb/nsh/defconfig
@@ -54,7 +54,6 @@
 #   the delay actually is 100 seconds.
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -91,7 +90,6 @@ CONFIG_ARCH_BOARD_PIC32MX7MMB=y
 CONFIG_BOARD_LOOPSPERMSEC=7245
 CONFIG_DRAM_SIZE=(128*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/pic32mx7mmb/ostest/defconfig b/nuttx/configs/pic32mx7mmb/ostest/defconfig
index fd897e34d3..691dbab8e8 100644
--- a/nuttx/configs/pic32mx7mmb/ostest/defconfig
+++ b/nuttx/configs/pic32mx7mmb/ostest/defconfig
@@ -54,7 +54,6 @@
 #   the delay actually is 100 seconds.
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -91,7 +90,6 @@ CONFIG_ARCH_BOARD_PIC32MX7MMB=y
 CONFIG_BOARD_LOOPSPERMSEC=7245
 CONFIG_DRAM_SIZE=(128*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/qemu-i486/nsh/defconfig b/nuttx/configs/qemu-i486/nsh/defconfig
index 03d0351da6..9b9f1a3f26 100644
--- a/nuttx/configs/qemu-i486/nsh/defconfig
+++ b/nuttx/configs/qemu-i486/nsh/defconfig
@@ -48,7 +48,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_QEMU_I486=y
 CONFIG_BOARD_LOOPSPERMSEC=999
 CONFIG_DRAM_SIZE=0x00100000
 CONFIG_DRAM_START=0x00100000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_STACKDUMP=y
 CONFIG_ARCH_LEDS=n
diff --git a/nuttx/configs/qemu-i486/ostest/defconfig b/nuttx/configs/qemu-i486/ostest/defconfig
index d5c1cc494c..3bdef6c958 100644
--- a/nuttx/configs/qemu-i486/ostest/defconfig
+++ b/nuttx/configs/qemu-i486/ostest/defconfig
@@ -48,7 +48,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_QEMU_I486=y
 CONFIG_BOARD_LOOPSPERMSEC=999
 CONFIG_DRAM_SIZE=0x00100000
 CONFIG_DRAM_START=0x00100000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_STACKDUMP=y
 CONFIG_ARCH_LEDS=n
diff --git a/nuttx/configs/sam3u-ek/README.txt b/nuttx/configs/sam3u-ek/README.txt
index 510d2f1e65..cb0b82c8f7 100755
--- a/nuttx/configs/sam3u-ek/README.txt
+++ b/nuttx/configs/sam3u-ek/README.txt
@@ -233,10 +233,6 @@ SAM3U-EK-specific Configuration Options
 
 	   CONFIG_DRAM_START=0x20000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The SAM3UF103Z supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/sam3u-ek/knsh/defconfig b/nuttx/configs/sam3u-ek/knsh/defconfig
index ebb40af675..766eada4aa 100755
--- a/nuttx/configs/sam3u-ek/knsh/defconfig
+++ b/nuttx/configs/sam3u-ek/knsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_SAM3UEK=y
 CONFIG_BOARD_LOOPSPERMSEC=4768
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/sam3u-ek/nsh/defconfig b/nuttx/configs/sam3u-ek/nsh/defconfig
index 487c24c647..05c9f5ddd2 100755
--- a/nuttx/configs/sam3u-ek/nsh/defconfig
+++ b/nuttx/configs/sam3u-ek/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_SAM3UEK=y
 CONFIG_BOARD_LOOPSPERMSEC=4768
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/sam3u-ek/nx/defconfig b/nuttx/configs/sam3u-ek/nx/defconfig
index 0be6c00032..7d799b9ff5 100755
--- a/nuttx/configs/sam3u-ek/nx/defconfig
+++ b/nuttx/configs/sam3u-ek/nx/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_SAM3UEK=y
 CONFIG_BOARD_LOOPSPERMSEC=4768
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/sam3u-ek/ostest/defconfig b/nuttx/configs/sam3u-ek/ostest/defconfig
index 5fe5d065a0..832c96163f 100755
--- a/nuttx/configs/sam3u-ek/ostest/defconfig
+++ b/nuttx/configs/sam3u-ek/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_SAM3UEK=y
 CONFIG_BOARD_LOOPSPERMSEC=4768
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/sam3u-ek/touchscreen/defconfig b/nuttx/configs/sam3u-ek/touchscreen/defconfig
index 30e5ed6e81..7e56a949ea 100755
--- a/nuttx/configs/sam3u-ek/touchscreen/defconfig
+++ b/nuttx/configs/sam3u-ek/touchscreen/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_SAM3UEK=y
 CONFIG_BOARD_LOOPSPERMSEC=4768
 CONFIG_DRAM_SIZE=0x00008000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/skp16c26/ostest/defconfig b/nuttx/configs/skp16c26/ostest/defconfig
index 6ab7318e65..f9fccf4bfe 100644
--- a/nuttx/configs/skp16c26/ostest/defconfig
+++ b/nuttx/configs/skp16c26/ostest/defconfig
@@ -53,7 +53,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the internal SRAM.
 # CONFIG_DRAM_START - The start address of internal SRAM
-# CONFIG_DRAM_END - The end+1 address of internal SRAM
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
 #   stack in bytes.  If not defined, the user task stacks will be
@@ -73,7 +72,6 @@ CONFIG_ARCH_NOINTC=y
 CONFIG_ENDIAN_BIG=y
 CONFIG_DRAM_SIZE=0x00800
 CONFIG_DRAM_START=0x00400
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_BOARD_LOOPSPERMSEC=16945
 CONFIG_ARCH_INTERRUPTSTACK=128
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/README.txt b/nuttx/configs/stm3210e-eval/README.txt
index 975e85ceda..0d292565eb 100755
--- a/nuttx/configs/stm3210e-eval/README.txt
+++ b/nuttx/configs/stm3210e-eval/README.txt
@@ -419,10 +419,6 @@ STM3210E-EVAL-specific Configuration Options
 
        CONFIG_DRAM_START=0x20000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_IRQPRIO - The STM32F103Z supports interrupt prioritization
 
        CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/stm3210e-eval/RIDE/defconfig b/nuttx/configs/stm3210e-eval/RIDE/defconfig
index 0def352a8a..b7d628b502 100755
--- a/nuttx/configs/stm3210e-eval/RIDE/defconfig
+++ b/nuttx/configs/stm3210e-eval/RIDE/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/buttons/defconfig b/nuttx/configs/stm3210e-eval/buttons/defconfig
index bcae6fccca..e1ea2cfc04 100644
--- a/nuttx/configs/stm3210e-eval/buttons/defconfig
+++ b/nuttx/configs/stm3210e-eval/buttons/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -80,7 +79,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/composite/defconfig b/nuttx/configs/stm3210e-eval/composite/defconfig
index 3c7e83f145..62d9eb07f2 100755
--- a/nuttx/configs/stm3210e-eval/composite/defconfig
+++ b/nuttx/configs/stm3210e-eval/composite/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/nsh/defconfig b/nuttx/configs/stm3210e-eval/nsh/defconfig
index 982ab281e8..c4245b133f 100755
--- a/nuttx/configs/stm3210e-eval/nsh/defconfig
+++ b/nuttx/configs/stm3210e-eval/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/nsh2/defconfig b/nuttx/configs/stm3210e-eval/nsh2/defconfig
index ebe8fc5be5..22afd76f91 100644
--- a/nuttx/configs/stm3210e-eval/nsh2/defconfig
+++ b/nuttx/configs/stm3210e-eval/nsh2/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/nx/defconfig b/nuttx/configs/stm3210e-eval/nx/defconfig
index 5488ae8910..a3514b096a 100644
--- a/nuttx/configs/stm3210e-eval/nx/defconfig
+++ b/nuttx/configs/stm3210e-eval/nx/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/nxconsole/defconfig b/nuttx/configs/stm3210e-eval/nxconsole/defconfig
index a84fc81344..261e09bb9e 100644
--- a/nuttx/configs/stm3210e-eval/nxconsole/defconfig
+++ b/nuttx/configs/stm3210e-eval/nxconsole/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/nxlines/defconfig b/nuttx/configs/stm3210e-eval/nxlines/defconfig
index b1e4f960a8..8e4ee57e73 100644
--- a/nuttx/configs/stm3210e-eval/nxlines/defconfig
+++ b/nuttx/configs/stm3210e-eval/nxlines/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/nxtext/defconfig b/nuttx/configs/stm3210e-eval/nxtext/defconfig
index 097287fb47..b90364ec80 100644
--- a/nuttx/configs/stm3210e-eval/nxtext/defconfig
+++ b/nuttx/configs/stm3210e-eval/nxtext/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/ostest/defconfig b/nuttx/configs/stm3210e-eval/ostest/defconfig
index f70ba0a81b..9238a59a9c 100755
--- a/nuttx/configs/stm3210e-eval/ostest/defconfig
+++ b/nuttx/configs/stm3210e-eval/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/pm/defconfig b/nuttx/configs/stm3210e-eval/pm/defconfig
index 2e135dbefe..f2b47598b4 100644
--- a/nuttx/configs/stm3210e-eval/pm/defconfig
+++ b/nuttx/configs/stm3210e-eval/pm/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/usbserial/defconfig b/nuttx/configs/stm3210e-eval/usbserial/defconfig
index e0c17d7f7d..28af3b1caf 100755
--- a/nuttx/configs/stm3210e-eval/usbserial/defconfig
+++ b/nuttx/configs/stm3210e-eval/usbserial/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3210e-eval/usbstorage/defconfig b/nuttx/configs/stm3210e-eval/usbstorage/defconfig
index aef6d11c2f..0109f2da40 100755
--- a/nuttx/configs/stm3210e-eval/usbstorage/defconfig
+++ b/nuttx/configs/stm3210e-eval/usbstorage/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3210E_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3220g-eval/README.txt b/nuttx/configs/stm3220g-eval/README.txt
index a064503f1d..43d9b382e2 100644
--- a/nuttx/configs/stm3220g-eval/README.txt
+++ b/nuttx/configs/stm3220g-eval/README.txt
@@ -468,10 +468,6 @@ STM3220G-EVAL-specific Configuration Options
 
        CONFIG_DRAM_START=0x20000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     In addition to internal SRAM, SRAM may also be available through the FSMC.
     In order to use FSMC SRAM, the following additional things need to be
     present in the NuttX configuration file:
diff --git a/nuttx/configs/stm3220g-eval/dhcpd/defconfig b/nuttx/configs/stm3220g-eval/dhcpd/defconfig
index e01d3cf91d..c71d7cfede 100644
--- a/nuttx/configs/stm3220g-eval/dhcpd/defconfig
+++ b/nuttx/configs/stm3220g-eval/dhcpd/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3220xxx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3220G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3220g-eval/nettest/defconfig b/nuttx/configs/stm3220g-eval/nettest/defconfig
index 3be35afa4f..56a205e4b0 100644
--- a/nuttx/configs/stm3220g-eval/nettest/defconfig
+++ b/nuttx/configs/stm3220g-eval/nettest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3220xxx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3220G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3220g-eval/nsh/defconfig b/nuttx/configs/stm3220g-eval/nsh/defconfig
index 09462fc564..a0f7a64be2 100644
--- a/nuttx/configs/stm3220g-eval/nsh/defconfig
+++ b/nuttx/configs/stm3220g-eval/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3220xxx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3220G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3220g-eval/nsh2/defconfig b/nuttx/configs/stm3220g-eval/nsh2/defconfig
index 8a9dbf07fa..08f0b0f265 100644
--- a/nuttx/configs/stm3220g-eval/nsh2/defconfig
+++ b/nuttx/configs/stm3220g-eval/nsh2/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3220xxx supports interrupt prioritization
 #   (But, unfortunately, GCC does not support it).
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
@@ -80,7 +79,6 @@ CONFIG_ARCH_BOARD_STM3220G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3220g-eval/nxwm/defconfig b/nuttx/configs/stm3220g-eval/nxwm/defconfig
index bf5569a9c8..d49b8c7658 100644
--- a/nuttx/configs/stm3220g-eval/nxwm/defconfig
+++ b/nuttx/configs/stm3220g-eval/nxwm/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3220xxx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3220G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3220g-eval/ostest/defconfig b/nuttx/configs/stm3220g-eval/ostest/defconfig
index 663efded4b..8eb5e5ec11 100644
--- a/nuttx/configs/stm3220g-eval/ostest/defconfig
+++ b/nuttx/configs/stm3220g-eval/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3220xxx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3220G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3220g-eval/telnetd/defconfig b/nuttx/configs/stm3220g-eval/telnetd/defconfig
index f9d588ad12..f96f6d76a8 100644
--- a/nuttx/configs/stm3220g-eval/telnetd/defconfig
+++ b/nuttx/configs/stm3220g-eval/telnetd/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3220xxx supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_STM3220G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/stm3240g-eval/README.txt b/nuttx/configs/stm3240g-eval/README.txt
index 59d12a8848..49e939a238 100755
--- a/nuttx/configs/stm3240g-eval/README.txt
+++ b/nuttx/configs/stm3240g-eval/README.txt
@@ -582,10 +582,6 @@ STM3240G-EVAL-specific Configuration Options
 
        CONFIG_DRAM_START=0x20000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_STM32_CCMEXCLUDE - Exclude CCM SRAM from the HEAP
 
     In addition to internal SRAM, SRAM may also be available through the FSMC.
diff --git a/nuttx/configs/stm3240g-eval/dhcpd/defconfig b/nuttx/configs/stm3240g-eval/dhcpd/defconfig
index 81d1321433..a4c26bc4db 100644
--- a/nuttx/configs/stm3240g-eval/dhcpd/defconfig
+++ b/nuttx/configs/stm3240g-eval/dhcpd/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3240xxx supports interrupt prioritization
 # CONFIG_ARCH_FPU - The STM3240xxx supports a floating point unit (FPU)
 #   (But, unfortunately, GCC does not support it).
@@ -81,7 +80,6 @@ CONFIG_ARCH_BOARD_STM3240G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/stm3240g-eval/nettest/defconfig b/nuttx/configs/stm3240g-eval/nettest/defconfig
index 76f39275fe..d3b2af33a8 100644
--- a/nuttx/configs/stm3240g-eval/nettest/defconfig
+++ b/nuttx/configs/stm3240g-eval/nettest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3240xxx supports interrupt prioritization
 # CONFIG_ARCH_FPU - The STM3240xxx supports a floating point unit (FPU)
 #   (But, unfortunately, GCC does not support it).
@@ -81,7 +80,6 @@ CONFIG_ARCH_BOARD_STM3240G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/stm3240g-eval/nsh/defconfig b/nuttx/configs/stm3240g-eval/nsh/defconfig
index 16c6258f38..2f4c323271 100644
--- a/nuttx/configs/stm3240g-eval/nsh/defconfig
+++ b/nuttx/configs/stm3240g-eval/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3240xxx supports interrupt prioritization
 # CONFIG_ARCH_FPU - The STM3240xxx supports a floating point unit (FPU)
 #   (But, unfortunately, GCC does not support it).
@@ -81,7 +80,6 @@ CONFIG_ARCH_BOARD_STM3240G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/stm3240g-eval/nsh2/defconfig b/nuttx/configs/stm3240g-eval/nsh2/defconfig
index 9a35fd75fe..c4b9df773a 100644
--- a/nuttx/configs/stm3240g-eval/nsh2/defconfig
+++ b/nuttx/configs/stm3240g-eval/nsh2/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3240xxx supports interrupt prioritization
 # CONFIG_ARCH_FPU - The STM3240xxx supports a floating point unit (FPU)
 #   (But, unfortunately, GCC does not support it).
@@ -81,7 +80,6 @@ CONFIG_ARCH_BOARD_STM3240G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/stm3240g-eval/nxconsole/defconfig b/nuttx/configs/stm3240g-eval/nxconsole/defconfig
index 57e6a19e5c..3c9f15e2d4 100644
--- a/nuttx/configs/stm3240g-eval/nxconsole/defconfig
+++ b/nuttx/configs/stm3240g-eval/nxconsole/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3240xxx supports interrupt prioritization
 # CONFIG_ARCH_FPU - The STM3240xxx supports a floating point unit (FPU)
 #   (But, unfortunately, GCC does not support it).
@@ -81,7 +80,6 @@ CONFIG_ARCH_BOARD_STM3240G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/stm3240g-eval/nxwm/defconfig b/nuttx/configs/stm3240g-eval/nxwm/defconfig
index ff44fa2852..3816279704 100644
--- a/nuttx/configs/stm3240g-eval/nxwm/defconfig
+++ b/nuttx/configs/stm3240g-eval/nxwm/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3240xxx supports interrupt prioritization
 # CONFIG_ARCH_FPU - The STM3240xxx supports a floating point unit (FPU)
 #   (But, unfortunately, GCC does not support it).
@@ -81,7 +80,6 @@ CONFIG_ARCH_BOARD_STM3240G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/stm3240g-eval/ostest/defconfig b/nuttx/configs/stm3240g-eval/ostest/defconfig
index 98e3aa3183..bfe63c1365 100644
--- a/nuttx/configs/stm3240g-eval/ostest/defconfig
+++ b/nuttx/configs/stm3240g-eval/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3240xxx supports interrupt prioritization
 # CONFIG_ARCH_FPU - The STM3240xxx supports a floating point unit (FPU)
 #   (But, unfortunately, GCC does not support it).
@@ -81,7 +80,6 @@ CONFIG_ARCH_BOARD_STM3240G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/stm3240g-eval/telnetd/defconfig b/nuttx/configs/stm3240g-eval/telnetd/defconfig
index f75fb46397..3ca3dd87c1 100644
--- a/nuttx/configs/stm3240g-eval/telnetd/defconfig
+++ b/nuttx/configs/stm3240g-eval/telnetd/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM3240xxx supports interrupt prioritization
 # CONFIG_ARCH_FPU - The STM3240xxx supports a floating point unit (FPU)
 #   (But, unfortunately, GCC does not support it).
@@ -81,7 +80,6 @@ CONFIG_ARCH_BOARD_STM3240G_EVAL=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/stm32f4discovery/README.txt b/nuttx/configs/stm32f4discovery/README.txt
index 387a76431f..09a2bb2b00 100755
--- a/nuttx/configs/stm32f4discovery/README.txt
+++ b/nuttx/configs/stm32f4discovery/README.txt
@@ -695,10 +695,6 @@ STM32F4Discovery-specific Configuration Options
 
        CONFIG_DRAM_START=0x20000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_STM32_CCMEXCLUDE - Exclude CCM SRAM from the HEAP
 
     In addition to internal SRAM, SRAM may also be available through the FSMC.
diff --git a/nuttx/configs/stm32f4discovery/nsh/defconfig b/nuttx/configs/stm32f4discovery/nsh/defconfig
index 2280bbf9ab..4be8ea7918 100644
--- a/nuttx/configs/stm32f4discovery/nsh/defconfig
+++ b/nuttx/configs/stm32f4discovery/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM32F4Discovery supports interrupt prioritization
 # CONFIG_ARCH_FPU - The STM32F4Discovery supports a floating point unit (FPU)
 #   (But, unfortunately, GCC does not support it).
@@ -81,7 +80,6 @@ CONFIG_ARCH_BOARD_STM32F4_DISCOVERY=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/stm32f4discovery/nxlines/defconfig b/nuttx/configs/stm32f4discovery/nxlines/defconfig
index c5515c426c..28dd44adc1 100644
--- a/nuttx/configs/stm32f4discovery/nxlines/defconfig
+++ b/nuttx/configs/stm32f4discovery/nxlines/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM32F4Discovery supports interrupt prioritization
 # CONFIG_ARCH_FPU - The STM32F4Discovery supports a floating point unit (FPU)
 #   (But, unfortunately, GCC does not support it).
@@ -81,7 +80,6 @@ CONFIG_ARCH_BOARD_STM32F4_DISCOVERY=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/stm32f4discovery/ostest/defconfig b/nuttx/configs/stm32f4discovery/ostest/defconfig
index a984d26a17..066fb4017f 100644
--- a/nuttx/configs/stm32f4discovery/ostest/defconfig
+++ b/nuttx/configs/stm32f4discovery/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM32F4Discovery supports interrupt prioritization
 # CONFIG_ARCH_FPU - The STM32F4Discovery supports a floating point unit (FPU)
 #   (But, unfortunately, GCC does not support it).
@@ -81,7 +80,6 @@ CONFIG_ARCH_BOARD_STM32F4_DISCOVERY=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/stm32f4discovery/pm/defconfig b/nuttx/configs/stm32f4discovery/pm/defconfig
index 49ced00068..136c5c1f2d 100644
--- a/nuttx/configs/stm32f4discovery/pm/defconfig
+++ b/nuttx/configs/stm32f4discovery/pm/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The STM32F4Discovery supports interrupt prioritization
 # CONFIG_ARCH_FPU - The STM32F4Discovery supports a floating point unit (FPU)
 #   (But, unfortunately, GCC does not support it).
@@ -81,7 +80,6 @@ CONFIG_ARCH_BOARD_STM32F4_DISCOVERY=y
 CONFIG_BOARD_LOOPSPERMSEC=16717
 CONFIG_DRAM_SIZE=0x00030000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_FPU=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/sure-pic32mx/README.txt b/nuttx/configs/sure-pic32mx/README.txt
index bd206a2626..ad98356980 100644
--- a/nuttx/configs/sure-pic32mx/README.txt
+++ b/nuttx/configs/sure-pic32mx/README.txt
@@ -456,10 +456,6 @@ PIC32MX Configuration Options
 
        CONFIG_DRAM_START=0xa0000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_IRQPRIO - The PIC32MXx supports interrupt prioritization
 
        CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/sure-pic32mx/nsh/defconfig b/nuttx/configs/sure-pic32mx/nsh/defconfig
index a49a1a4f52..926aac26b2 100644
--- a/nuttx/configs/sure-pic32mx/nsh/defconfig
+++ b/nuttx/configs/sure-pic32mx/nsh/defconfig
@@ -54,7 +54,6 @@
 #   the delay actually is 100 seconds.
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -93,7 +92,6 @@ CONFIG_ARCH_DBDP11212=n
 CONFIG_BOARD_LOOPSPERMSEC=4275
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/sure-pic32mx/ostest/defconfig b/nuttx/configs/sure-pic32mx/ostest/defconfig
index 960298699d..4ddbdbc9ac 100644
--- a/nuttx/configs/sure-pic32mx/ostest/defconfig
+++ b/nuttx/configs/sure-pic32mx/ostest/defconfig
@@ -54,7 +54,6 @@
 #   the delay actually is 100 seconds.
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -93,7 +92,6 @@ CONFIG_ARCH_DBDP11212=n
 CONFIG_BOARD_LOOPSPERMSEC=4275
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/sure-pic32mx/usbnsh/defconfig b/nuttx/configs/sure-pic32mx/usbnsh/defconfig
index 3a26c5ba23..7571bee37d 100644
--- a/nuttx/configs/sure-pic32mx/usbnsh/defconfig
+++ b/nuttx/configs/sure-pic32mx/usbnsh/defconfig
@@ -54,7 +54,6 @@
 #   the delay actually is 100 seconds.
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -93,7 +92,6 @@ CONFIG_ARCH_DBDP11212=n
 CONFIG_BOARD_LOOPSPERMSEC=4275
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/teensy/README.txt b/nuttx/configs/teensy/README.txt
index 14708ab415..979d8e0e78 100644
--- a/nuttx/configs/teensy/README.txt
+++ b/nuttx/configs/teensy/README.txt
@@ -429,10 +429,6 @@ Teensy++ Configuration Options
 
        CONFIG_DRAM_START=0x800100
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
        have LEDs
 
diff --git a/nuttx/configs/teensy/hello/defconfig b/nuttx/configs/teensy/hello/defconfig
index 29e8a37c9b..dc5e58d650 100644
--- a/nuttx/configs/teensy/hello/defconfig
+++ b/nuttx/configs/teensy/hello/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -82,7 +81,6 @@ CONFIG_ARCH_BOARD_TEENSY=y
 CONFIG_BOARD_LOOPSPERMSEC=(8*108)
 CONFIG_DRAM_SIZE=(8*1024)
 CONFIG_DRAM_START=0x800100
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=y
 CONFIG_ARCH_IRQPRIO=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/teensy/nsh/defconfig b/nuttx/configs/teensy/nsh/defconfig
index 49ca067286..68c2c97f5e 100755
--- a/nuttx/configs/teensy/nsh/defconfig
+++ b/nuttx/configs/teensy/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -82,7 +81,6 @@ CONFIG_ARCH_BOARD_TEENSY=y
 CONFIG_BOARD_LOOPSPERMSEC=(8*108)
 CONFIG_DRAM_SIZE=(8*1024)
 CONFIG_DRAM_START=0x800100
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=y
 CONFIG_ARCH_IRQPRIO=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/teensy/usbstorage/defconfig b/nuttx/configs/teensy/usbstorage/defconfig
index 2ea9d51ab3..570c7f881b 100755
--- a/nuttx/configs/teensy/usbstorage/defconfig
+++ b/nuttx/configs/teensy/usbstorage/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -82,7 +81,6 @@ CONFIG_ARCH_BOARD_TEENSY=y
 CONFIG_BOARD_LOOPSPERMSEC=(8*108)
 CONFIG_DRAM_SIZE=(8*1024)
 CONFIG_DRAM_START=0x800100
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=y
 CONFIG_ARCH_IRQPRIO=n
 CONFIG_ARCH_INTERRUPTSTACK=n
diff --git a/nuttx/configs/twr-k60n512/README.txt b/nuttx/configs/twr-k60n512/README.txt
index 9ad7c18535..5cb273a398 100644
--- a/nuttx/configs/twr-k60n512/README.txt
+++ b/nuttx/configs/twr-k60n512/README.txt
@@ -474,10 +474,6 @@ TWR-K60N512-specific Configuration Options
 
 	   CONFIG_DRAM_START=0x20000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The Kinetis K60 supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/twr-k60n512/nsh/defconfig b/nuttx/configs/twr-k60n512/nsh/defconfig
index cf54ffc06d..84359b388b 100644
--- a/nuttx/configs/twr-k60n512/nsh/defconfig
+++ b/nuttx/configs/twr-k60n512/nsh/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The K60X512VMD100 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_TWR_K60N512=y
 CONFIG_BOARD_LOOPSPERMSEC=9535
 CONFIG_DRAM_START=0x1fff0000
 CONFIG_DRAM_SIZE=0x00020000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/twr-k60n512/ostest/defconfig b/nuttx/configs/twr-k60n512/ostest/defconfig
index feba4c0a6e..e82877d529 100644
--- a/nuttx/configs/twr-k60n512/ostest/defconfig
+++ b/nuttx/configs/twr-k60n512/ostest/defconfig
@@ -51,7 +51,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The K60X512VMD100 supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -79,7 +78,6 @@ CONFIG_ARCH_BOARD_TWR_K60N512=y
 CONFIG_BOARD_LOOPSPERMSEC=9535
 CONFIG_DRAM_START=0x1fff0000
 CONFIG_DRAM_SIZE=0x00020000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y
diff --git a/nuttx/configs/ubw32/README.txt b/nuttx/configs/ubw32/README.txt
index a1652403bf..f8afb88e4f 100644
--- a/nuttx/configs/ubw32/README.txt
+++ b/nuttx/configs/ubw32/README.txt
@@ -429,10 +429,6 @@ PIC32MX Configuration Options
 
        CONFIG_DRAM_START=0xa0000000
 
-    CONFIG_DRAM_END - Last address+1 of installed RAM
-
-       CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
     CONFIG_ARCH_IRQPRIO - The PIC32MXx supports interrupt prioritization
 
        CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/ubw32/nsh/defconfig b/nuttx/configs/ubw32/nsh/defconfig
index 6025493289..3bd34a8de9 100644
--- a/nuttx/configs/ubw32/nsh/defconfig
+++ b/nuttx/configs/ubw32/nsh/defconfig
@@ -52,7 +52,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -92,7 +91,6 @@ CONFIG_ARCH_BOARD_UBW32=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/ubw32/ostest/defconfig b/nuttx/configs/ubw32/ostest/defconfig
index 2aef9c3ec1..4f30de55d5 100644
--- a/nuttx/configs/ubw32/ostest/defconfig
+++ b/nuttx/configs/ubw32/ostest/defconfig
@@ -52,7 +52,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_NOINTC - define if the architecture does not
 #   support an interrupt controller or otherwise cannot support
 #   APIs like up_enable_irq() and up_disable_irq().
@@ -92,7 +91,6 @@ CONFIG_ARCH_BOARD_UBW32=y
 CONFIG_BOARD_LOOPSPERMSEC=8079
 CONFIG_DRAM_SIZE=(32*1024)
 CONFIG_DRAM_START=0xa0000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_NOINTC=n
 CONFIG_ARCH_VECNOTIRQ=y
 CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/us7032evb1/nsh/defconfig b/nuttx/configs/us7032evb1/nsh/defconfig
index 2ab2fe7870..75a97f5c76 100644
--- a/nuttx/configs/us7032evb1/nsh/defconfig
+++ b/nuttx/configs/us7032evb1/nsh/defconfig
@@ -78,7 +78,6 @@ CONFIG_ARCH_LEDS=y
 CONFIG_ARCH_BUTTONS=y
 CONFIG_DRAM_SIZE=0x0000e000
 CONFIG_DRAM_START=0x0a002000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_INTERRUPTSTACK=0
 CONFIG_ARCH_STACKDUMP=y
 
diff --git a/nuttx/configs/us7032evb1/ostest/defconfig b/nuttx/configs/us7032evb1/ostest/defconfig
index 31bd8b214a..f1b8998072 100644
--- a/nuttx/configs/us7032evb1/ostest/defconfig
+++ b/nuttx/configs/us7032evb1/ostest/defconfig
@@ -78,7 +78,6 @@ CONFIG_ARCH_LEDS=y
 CONFIG_ARCH_BUTTONS=y
 CONFIG_DRAM_SIZE=0x0000e000
 CONFIG_DRAM_START=0x0a002000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_INTERRUPTSTACK=0
 CONFIG_ARCH_STACKDUMP=y
 
diff --git a/nuttx/configs/vsn/README.txt b/nuttx/configs/vsn/README.txt
index 1cbe359506..9a9209ebe1 100644
--- a/nuttx/configs/vsn/README.txt
+++ b/nuttx/configs/vsn/README.txt
@@ -214,10 +214,6 @@ VSN-specific Configuration Options
 
 	   CONFIG_DRAM_START=0x20000000
 
-	CONFIG_DRAM_END - Last address+1 of installed RAM
-
-	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
-
 	CONFIG_ARCH_IRQPRIO - The STM32F103Z supports interrupt prioritization
 
 	   CONFIG_ARCH_IRQPRIO=y
diff --git a/nuttx/configs/vsn/nsh/defconfig b/nuttx/configs/vsn/nsh/defconfig
index 36d6841554..0282d31e78 100755
--- a/nuttx/configs/vsn/nsh/defconfig
+++ b/nuttx/configs/vsn/nsh/defconfig
@@ -53,7 +53,6 @@
 # CONFIG_BOARD_LOOPSPERMSEC - for delay loops
 # CONFIG_DRAM_SIZE - Describes the installed DRAM.
 # CONFIG_DRAM_START - The start address of DRAM (physical)
-# CONFIG_DRAM_END - Last address+1 of installed RAM
 # CONFIG_ARCH_IRQPRIO - The ST32F103Z supports interrupt prioritization
 # CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
 #   stack. If defined, this symbol is the size of the interrupt
@@ -82,7 +81,6 @@ CONFIG_ARCH_BOARD_VSN=y
 CONFIG_BOARD_LOOPSPERMSEC=5483
 CONFIG_DRAM_SIZE=0x00010000
 CONFIG_DRAM_START=0x20000000
-CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)
 CONFIG_ARCH_IRQPRIO=y
 CONFIG_ARCH_INTERRUPTSTACK=n
 CONFIG_ARCH_STACKDUMP=y