Add beginning of a test for NXFFS

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@3540 7fd9a85b-ad96-42d3-883c-3090e2eb8679

21 files changed, 1431 insertions, 46 deletions

diff --git a/apps/examples/README.txt b/apps/examples/README.txt
index 7f000dd5a7..d342814c2d 100644
--- a/apps/examples/README.txt
+++ b/apps/examples/README.txt
@@ -228,6 +228,14 @@ examples/nx
     CONFIG_DISABLE_PTHREAD=n
     CONFIG_NX_BLOCKING=y
 
+examples/nxffs
+^^^^^^^^^^^^^^
+
+  This is a test of the NuttX NXFFS FLASH file system.  This is an NXFFS
+  stress test and beats on the file system very hard.  It should only
+  be used in a simulation environment!  Putting this NXFFS test on real
+  hardware will most likely destroy your FLASH.  You have been warned.
+
 examples/nxflat
 ^^^^^^^^^^^^^^^
 
diff --git a/apps/examples/nxffs/Makefile b/apps/examples/nxffs/Makefile
new file mode 100644
index 0000000000..1021bfc6d1
--- /dev/null
+++ b/apps/examples/nxffs/Makefile
@@ -0,0 +1,93 @@
+############################################################################
+# apps/examples/nxffs/Makefile
+#
+#   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+-include $(TOPDIR)/.config
+-include $(TOPDIR)/Make.defs
+include $(APPDIR)/Make.defs
+
+# Hello, World! Example
+
+ASRCS		=
+CSRCS		= nxffs_main.c
+
+AOBJS		= $(ASRCS:.S=$(OBJEXT))
+COBJS		= $(CSRCS:.c=$(OBJEXT))
+
+SRCS		= $(ASRCS) $(CSRCS)
+OBJS		= $(AOBJS) $(COBJS)
+
+ifeq ($(WINTOOL),y)
+  BIN		= "${shell cygpath -w  $(APPDIR)/libapps$(LIBEXT)}"
+else
+  BIN		= "$(APPDIR)/libapps$(LIBEXT)"
+endif
+
+ROOTDEPPATH	= --dep-path .
+
+# Common build
+
+VPATH		= 
+
+all: .built
+.PHONY: clean depend distclean
+
+$(AOBJS): %$(OBJEXT): %.S
+	$(call ASSEMBLE, $<, $@)
+
+$(COBJS): %$(OBJEXT): %.c
+	$(call COMPILE, $<, $@)
+
+.built: $(OBJS)
+	@( for obj in $(OBJS) ; do \
+		$(call ARCHIVE, $(BIN), $${obj}); \
+	done ; )
+	@touch .built
+
+context:
+
+.depend: Makefile $(SRCS)
+	@$(MKDEP) $(ROOTDEPPATH) $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
+	@touch $@
+
+depend: .depend
+
+clean:
+	@rm -f *.o *~ .*.swp .built
+	$(call CLEAN)
+
+distclean: clean
+	@rm -f Make.dep .depend
+
+-include Make.dep
diff --git a/apps/examples/nxffs/nxffs_main.c b/apps/examples/nxffs/nxffs_main.c
new file mode 100644
index 0000000000..2e046a26f6
--- /dev/null
+++ b/apps/examples/nxffs/nxffs_main.c
@@ -0,0 +1,111 @@
+/****************************************************************************
+ * examples/nxffs/nxffs_main.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <nuttx/mtd.h>
+#include <nuttx/nxffs.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+/* Configuration ************************************************************/
+/* This must exactly match the default configuration in drivers/mtd/rammtd.c */
+
+#ifndef CONFIG_RAMMTD_BLOCKSIZE
+#  define CONFIG_RAMMTD_BLOCKSIZE 512
+#endif
+
+#ifndef CONFIG_RAMMTD_ERASESIZE
+#  define CONFIG_RAMMTD_ERASESIZE 4096
+#endif
+
+#ifndef CONFIG_EXAMPLES_NXFFS_NEBLOCKS
+#  define CONFIG_EXAMPLES_NXFFS_NEBLOCKS (32)
+#endif
+
+#undef CONFIG_EXAMPLES_NXFFS_BUFSIZE
+#define CONFIG_EXAMPLES_NXFFS_BUFSIZE \
+  (CONFIG_RAMMTD_ERASESIZE * CONFIG_EXAMPLES_NXFFS_NEBLOCKS)
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+/* Pre-allocated simulated flash */
+
+static uint8_t g_simflash[CONFIG_EXAMPLES_NXFFS_BUFSIZE];
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * user_start
+ ****************************************************************************/
+
+int user_start(int argc, char *argv[])
+{
+  FAR struct mtd_dev_s *mtd;
+  int ret;
+
+  /* Create and initialize a RAM MTD device instance */
+
+  mtd = rammtd_initialize(g_simflash, CONFIG_EXAMPLES_NXFFS_BUFSIZE);
+  if (!mtd)
+    {
+      fprintf(stderr, "ERROR: Failed to create RAM MTD instance\n");
+      exit(1);
+    }
+
+  /* Initialize to provide NXFFS on an MTD interface */
+
+  ret = nxffs_initialize(mtd);
+  if (ret < 0)
+    {
+      fprintf(stderr, "ERROR: NXFFS initialization failed: %d\n", -ret);
+      exit(2);
+    }
+
+  return 0;
+}
+
diff --git a/nuttx/ChangeLog b/nuttx/ChangeLog
index 2b914e30e7..a0ade81662 100644
--- a/nuttx/ChangeLog
+++ b/nuttx/ChangeLog
@@ -1715,7 +1715,6 @@
 	  any other ARM9 build.
 	* fs/nxffs: Adding a tiny, wear-leveling FLASH file system for NuttX.  This
 	  file system is intended to be small and will have some limitations.  The
- 	  implementation is incomplete on initial checkin.
-
-
-
+	  implementation is incomplete on initial checkin.
+	* apps/examples/nxffs and configs/sim/nxffs:  Add a test a a configuration that
+	  will be used to verify NXFFS.
diff --git a/nuttx/configs/sim/nxffs/Make.defs b/nuttx/configs/sim/nxffs/Make.defs
new file mode 100644
index 0000000000..d137dd83c9
--- /dev/null
+++ b/nuttx/configs/sim/nxffs/Make.defs
@@ -0,0 +1,110 @@
+############################################################################
+# configs/sim/nxffs/Make.defs
+#
+#   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+include ${TOPDIR}/.config
+
+HOSTOS			= ${shell uname -o 2>/dev/null || echo "Other"}
+
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  ARCHOPTIMIZATION	= -g
+else
+  ARCHOPTIMIZATION	= -O2
+endif
+
+ARCHCPUFLAGS		= -fno-builtin
+ARCHPICFLAGS		= -fpic
+ARCHWARNINGS		= -Wall -Wstrict-prototypes -Wshadow
+ARCHDEFINES		=
+ARCHINCLUDES		= -I. -isystem $(TOPDIR)/include
+ARCHSCRIPT		=
+
+CROSSDEV		=
+CC			= $(CROSSDEV)gcc
+CPP			= $(CROSSDEV)gcc -E
+LD			= $(CROSSDEV)ld
+AR			= $(CROSSDEV)ar rcs
+NM			= $(CROSSDEV)nm
+OBJCOPY			= $(CROSSDEV)objcopy
+OBJDUMP			= $(CROSSDEV)objdump
+
+CFLAGS			= $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
+			  $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CPPFLAGS		= $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES)
+AFLAGS			= $(CFLAGS) -D__ASSEMBLY__
+
+OBJEXT			= .o
+LIBEXT			= .a
+
+ifeq ($(HOSTOS),Cygwin)
+  EXEEXT		= .exe
+else
+  EXEEXT		=
+endif
+
+ifeq ("${CONFIG_DEBUG_SYMBOLS}","y")
+  LDFLAGS		+= -g
+endif
+
+define PREPROCESS
+	@echo "CPP: $1->$2"
+	@$(CPP) $(CPPFLAGS) $1 -o $2
+endef
+
+define COMPILE
+	@echo "CC: $1"
+	@$(CC) -c $(CFLAGS) $1 -o $2
+endef
+
+define ASSEMBLE
+	@echo "AS: $1"
+	@$(CC) -c $(AFLAGS) $1 -o $2
+endef
+
+define ARCHIVE
+	echo "AR: $2"; \
+	$(AR) $1 $2 || { echo "$(AR) $1 $2 FAILED!" ; exit 1 ; }
+endef
+
+define CLEAN
+	@rm -f *.o *.a
+endef
+
+MKDEP			= $(TOPDIR)/tools/mkdeps.sh
+
+HOSTCC			= gcc
+HOSTINCLUDES		= -I.
+HOSTCFLAGS		= $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
+			  $(ARCHCPUFLAGS) $(HOSTINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+HOSTLDFLAGS		=
diff --git a/nuttx/configs/sim/nxffs/appconfig b/nuttx/configs/sim/nxffs/appconfig
new file mode 100644
index 0000000000..8170a0edd8
--- /dev/null
+++ b/nuttx/configs/sim/nxffs/appconfig
@@ -0,0 +1,39 @@
+############################################################################
+# configs/sim/nxffs/appconfig
+#
+#   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Path to example in apps/examples containing the user_start entry point
+
+CONFIGURED_APPS += examples/nxffs
+
diff --git a/nuttx/configs/sim/nxffs/defconfig b/nuttx/configs/sim/nxffs/defconfig
new file mode 100644
index 0000000000..c3edcfc155
--- /dev/null
+++ b/nuttx/configs/sim/nxffs/defconfig
@@ -0,0 +1,396 @@
+############################################################################
+# configs/sim/nxffs/defconfig
+#
+#   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+#
+# Architecture selection
+#
+# CONFIG_ARCH - identifies the arch subdirectory and, hence, the
+#   processor architecture.
+# CONFIG_ARCH_name - for use in C code.  This identifies the particular
+#   processor architecture (CONFIG_ARCH_SIM).
+# CONFIG_ARCH_BOARD - identifies the configs subdirectory and, hence,
+#   the board that supports the particular chip or SoC.
+# CONFIG_ARCH_BOARD_name - for use in C code
+# CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
+#
+CONFIG_ARCH=sim
+CONFIG_ARCH_SIM=y
+CONFIG_ARCH_BOARD=sim
+CONFIG_ARCH_BOARD_SIM=y
+
+#
+# General OS setup
+#
+# CONFIG_APPS_DIR - Identifies the relative path to the directory
+#   that builds the application to link with NuttX.  Default: ../apps
+# CONFIG_DEBUG - enables built-in debug options
+# CONFIG_DEBUG_VERBOSE - enables verbose debug output
+# CONFIG_DEBUG_SYMBOLS - build without optimization and with
+#   debug symbols (needed for use with a debugger).
+# CONFIG_MM_REGIONS - If the architecture includes multiple
+#   regions of memory to allocate from, this specifies the
+#   number of memory regions that the memory manager must
+#   handle and enables the API mm_addregion(start, end);
+# CONFIG_ARCH_LOWPUTC - architecture supports low-level, boot
+#   time console output
+# CONFIG_TICKS_PER_MSEC - The default system timer is 100Hz
+#   or TICKS_PER_MSEC=10.  This setting may be defined to
+#   inform NuttX that the processor hardware is providing
+#   system timer interrupts at some interrupt interval other
+#   than 10 msec.
+# CONFIG_RR_INTERVAL - The round robin timeslice will be set
+#   this number of milliseconds;  Round robin scheduling can
+#   be disabled by setting this value to zero.
+# CONFIG_SCHED_INSTRUMENTATION - enables instrumentation in 
+#   scheduler to monitor system performance
+# CONFIG_TASK_NAME_SIZE - Spcifies that maximum size of a
+#   task name to save in the TCB.  Useful if scheduler
+#   instrumentation is selected.  Set to zero to disable.
+# CONFIG_JULIAN_TIME - Enables Julian time conversions
+# CONFIG_START_YEAR, CONFIG_START_MONTH, CONFIG_START_DAY -
+#   Used to initialize the internal time logic.
+# CONFIG_DEV_CONSOLE - Set if architecture-specific logic
+#   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
+# CONFIG_MUTEX_TYPES: Set to enable support for recursive and
+#   errorcheck mutexes. Enables pthread_mutexattr_settype().
+# CONFIG_PRIORITY_INHERITANCE : Set to enable support for priority
+#   inheritance on mutexes and semaphores.
+# CONFIG_SEM_PREALLOCHOLDERS: This setting is only used if priority
+#   inheritance is enabled.  It defines the maximum number of
+#   different threads (minus one) that can take counts on a
+#   semaphore with priority inheritance support.  This may be 
+#   set to zero if priority inheritance is disabled OR if you
+#   are only using semaphores as mutexes (only one holder) OR
+#   if no more than two threads participate using a counting
+#   semaphore.
+# CONFIG_SEM_NNESTPRIO.  If priority inheritance is enabled,
+#   then this setting is the maximum number of higher priority
+#   threads (minus 1) than can be waiting for another thread
+#   to release a count on a semaphore.  This value may be set
+#   to zero if no more than one thread is expected to wait for
+#   a semaphore.
+# CONFIG_FDCLONE_DISABLE. Disable cloning of all file descriptors
+#   by task_create() when a new task is started.  If set, all
+#   files/drivers will appear to be closed in the new task.
+# CONFIG_FDCLONE_STDIO. Disable cloning of all but the first
+#   three file descriptors (stdin, stdout, stderr) by task_create()
+#   when a new task is started. If set, all files/drivers will
+#   appear to be closed in the new task except for stdin, stdout,
+#   and stderr.
+# CONFIG_SDCLONE_DISABLE. Disable cloning of all socket
+#   desciptors by task_create() when a new task is started. If
+#   set, all sockets will appear to be closed in the new task.
+#
+#CONFIG_APPS_DIR=
+CONFIG_DEBUG=y
+CONFIG_DEBUG_VERBOSE=y
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_DEBUG_FS=y
+CONFIG_MM_REGIONS=1
+CONFIG_ARCH_LOWPUTC=y
+CONFIG_RR_INTERVAL=0
+CONFIG_SCHED_INSTRUMENTATION=n
+CONFIG_TASK_NAME_SIZE=32
+CONFIG_START_YEAR=2011
+CONFIG_START_MONTH=4
+CONFIG_START_DAY=29
+CONFIG_JULIAN_TIME=n
+CONFIG_DEV_CONSOLE=y
+CONFIG_DEV_LOWCONSOLE=n
+CONFIG_MUTEX_TYPES=y
+CONFIG_PRIORITY_INHERITANCE=n
+CONFIG_SEM_PREALLOCHOLDERS=0
+CONFIG_SEM_NNESTPRIO=0
+CONFIG_FDCLONE_DISABLE=n
+CONFIG_FDCLONE_STDIO=n
+CONFIG_SDCLONE_DISABLE=y
+
+#
+# The following can be used to disable categories of
+# APIs supported by the OS.  If the compiler supports
+# weak functions, then it should not be necessary to
+# disable functions unless you want to restrict usage
+# of those APIs.
+#
+# There are certain dependency relationships in these
+# features.
+#
+# o mq_notify logic depends on signals to awaken tasks
+#   waiting for queues to become full or empty.
+# o pthread_condtimedwait() depends on signals to wake
+#   up waiting tasks.
+#
+CONFIG_DISABLE_CLOCK=n
+CONFIG_DISABLE_POSIX_TIMERS=y
+CONFIG_DISABLE_PTHREAD=y
+CONFIG_DISABLE_SIGNALS=y
+CONFIG_DISABLE_MQUEUE=y
+CONFIG_DISABLE_MOUNTPOINT=n
+CONFIG_DISABLE_ENVIRON=n
+CONFIG_DISABLE_POLL=y
+
+#
+# Misc libc settings
+#
+# CONFIG_NOPRINTF_FIELDWIDTH - sprintf-related logic is a
+#   little smaller if we do not support fieldwidthes
+#
+CONFIG_NOPRINTF_FIELDWIDTH=n
+
+#
+# Allow for architecture optimized implementations
+#
+# The architecture can provide optimized versions of the
+# following to improve sysem performance
+#
+CONFIG_ARCH_MEMCPY=n
+CONFIG_ARCH_MEMCMP=n
+CONFIG_ARCH_MEMMOVE=n
+CONFIG_ARCH_MEMSET=n
+CONFIG_ARCH_STRCMP=n
+CONFIG_ARCH_STRCPY=n
+CONFIG_ARCH_STRNCPY=n
+CONFIG_ARCH_STRLEN=n
+CONFIG_ARCH_STRNLEN=n
+CONFIG_ARCH_BZERO=n
+
+##
+# General build options
+#
+# CONFIG_RRLOAD_BINARY - make the rrload binary format used with
+#   BSPs from www.ridgerun.com using the tools/mkimage.sh script
+# CONFIG_INTELHEX_BINARY - make the Intel HEX binary format
+#   used with many different loaders using the GNU objcopy program
+#   Should not be selected if you are not using the GNU toolchain.
+# CONFIG_RAW_BINARY - make a raw binary format file used with many
+#   different loaders using the GNU objcopy program.  This option
+#   should not be selected if you are not using the GNU toolchain.
+# CONFIG_HAVE_LIBM - toolchain supports libm.a
+#
+CONFIG_RRLOAD_BINARY=n
+CONFIG_INTELHEX_BINARY=n
+CONFIG_RAW_BINARY=n
+CONFIG_HAVE_LIBM=y
+
+#
+# Sizes of configurable things (0 disables)
+#
+# CONFIG_MAX_TASKS - The maximum number of simultaneously
+#   active tasks. This value must be a power of two.
+# CONFIG_MAX_TASK_ARGS - This controls the maximum number of
+#   of parameters that a task may receive (i.e., maxmum value
+#   of 'argc')
+# CONFIG_NPTHREAD_KEYS - The number of items of thread-
+#   specific data that can be retained
+# CONFIG_NFILE_DESCRIPTORS - The maximum number of file
+#   descriptors (one for each open)
+# CONFIG_NFILE_STREAMS - The maximum number of streams that
+#   can be fopen'ed
+# CONFIG_NAME_MAX - The maximum size of a file name.
+# CONFIG_STDIO_BUFFER_SIZE - Size of the buffer to allocate
+#   on fopen. (Only if CONFIG_NFILE_STREAMS > 0)
+# CONFIG_NUNGET_CHARS - Number of characters that can be
+#   buffered by ungetc() (Only if CONFIG_NFILE_STREAMS > 0)
+# CONFIG_PREALLOC_MQ_MSGS - The number of pre-allocated message
+#   structures.  The system manages a pool of preallocated
+#   message structures to minimize dynamic allocations
+# CONFIG_MQ_MAXMSGSIZE - Message structures are allocated with
+#   a fixed payload size given by this settin (does not include
+#   other message structure overhead.
+# CONFIG_MAX_WDOGPARMS - Maximum number of parameters that
+#   can be passed to a watchdog handler
+# CONFIG_PREALLOC_WDOGS - The number of pre-allocated watchdog
+#   structures.  The system manages a pool of preallocated
+#   watchdog structures to minimize dynamic allocations
+# CONFIG_PREALLOC_TIMERS - The number of pre-allocated POSIX
+#   timer structures.  The system manages a pool of preallocated
+#   timer structures to minimize dynamic allocations.  Set to
+#   zero for all dynamic allocations.
+#
+CONFIG_MAX_TASKS=64
+CONFIG_MAX_TASK_ARGS=4
+CONFIG_NPTHREAD_KEYS=4
+CONFIG_NFILE_DESCRIPTORS=32
+CONFIG_NFILE_STREAMS=16
+CONFIG_NAME_MAX=32
+CONFIG_STDIO_BUFFER_SIZE=1024
+CONFIG_NUNGET_CHARS=2
+CONFIG_PREALLOC_MQ_MSGS=32
+CONFIG_MQ_MAXMSGSIZE=32
+CONFIG_MAX_WDOGPARMS=4
+CONFIG_PREALLOC_WDOGS=32
+CONFIG_PREALLOC_TIMERS=8
+
+#
+# FAT filesystem configuration
+# CONFIG_FS_FAT - Enable FAT filesystem support
+# CONFIG_FAT_SECTORSIZE - Max supported sector size
+# CONFIG_FS_ROMFS - Enable ROMFS filesystem support
+CONFIG_FS_FAT=y
+CONFIG_FS_ROMFS=n
+
+#
+# TCP/IP and UDP support via uIP
+# CONFIG_NET - Enable or disable all network features
+# CONFIG_NET_IPv6 - Build in support for IPv6
+# CONFIG_NSOCKET_DESCRIPTORS - Maximum number of socket descriptors per task/thread.
+# CONFIG_NET_SOCKOPTS - Enable or disable support for socket options
+# CONFIG_NET_BUFSIZE - uIP buffer size
+# CONFIG_NET_TCP - TCP support on or off
+# CONFIG_NET_TCP_CONNS - Maximum number of TCP connections (all tasks)
+# CONFIG_NET_TCP_READAHEAD_BUFSIZE - Size of TCP read-ahead buffers
+# CONFIG_NET_NTCP_READAHEAD_BUFFERS - Number of TCP read-ahead buffers (may be zero)
+# CONFIG_NET_TCPBACKLOG - Incoming connections pend in a backlog until
+#   accept() is called. The size of the backlog is selected when listen() is called.
+# CONFIG_NET_MAX_LISTENPORTS - Maximum number of listening TCP ports (all tasks)
+# CONFIG_NET_UDP - UDP support on or off
+# CONFIG_NET_UDP_CHECKSUMS - UDP checksums on or off
+# CONFIG_NET_UDP_CONNS - The maximum amount of concurrent UDP connections
+# CONFIG_NET_ICMP - ICMP ping response support on or off
+# CONFIG_NET_ICMP_PING - ICMP ping request support on or off
+# CONFIG_NET_PINGADDRCONF - Use "ping" packet for setting IP address
+# CONFIG_NET_STATISTICS - uIP statistics on or off
+# CONFIG_NET_RECEIVE_WINDOW - The size of the advertised receiver's window
+# CONFIG_NET_ARPTAB_SIZE - The size of the ARP table
+# CONFIG_NET_BROADCAST - Broadcast support
+# CONFIG_NET_FWCACHE_SIZE - number of packets to remember when looking for duplicates
+#
+CONFIG_NET=n
+CONFIG_NET_IPv6=n
+CONFIG_NSOCKET_DESCRIPTORS=0
+CONFIG_NET_SOCKOPTS=y
+CONFIG_NET_BUFSIZE=420
+CONFIG_NET_TCP=n
+CONFIG_NET_TCP_CONNS=40
+CONFIG_NET_MAX_LISTENPORTS=40
+CONFIG_NET_UDP=n
+CONFIG_NET_UDP_CHECKSUMS=y
+#CONFIG_NET_UDP_CONNS=10
+CONFIG_NET_ICMP=n
+CONFIG_NET_ICMP_PING=n
+#CONFIG_NET_PINGADDRCONF=0
+CONFIG_NET_STATISTICS=y
+#CONFIG_NET_RECEIVE_WINDOW=
+#CONFIG_NET_ARPTAB_SIZE=8
+CONFIG_NET_BROADCAST=n
+#CONFIG_NET_FWCACHE_SIZE=2
+
+#
+# UIP Network Utilities
+# CONFIG_NET_DHCP_LIGHT - Reduces size of DHCP
+# CONFIG_NET_RESOLV_ENTRIES - Number of resolver entries
+CONFIG_NET_DHCP_LIGHT=n
+CONFIG_NET_RESOLV_ENTRIES=4
+
+#
+# Settings for examples/uip
+CONFIG_EXAMPLE_UIP_IPADDR=(192<<24|168<<16|0<<8|128)
+CONFIG_EXAMPLE_UIP_DRIPADDR=(192<<24|168<<16|0<<8|1)
+CONFIG_EXAMPLE_UIP_NETMASK=(255<<24|255<<16|255<<8|0)
+CONFIG_EXAMPLE_UIP_DHCPC=n
+
+#
+# Settings for examples/nettest
+CONFIG_EXAMPLE_NETTEST_SERVER=n
+CONFIG_EXAMPLE_NETTEST_PERFORMANCE=n
+CONFIG_EXAMPLE_NETTEST_NOMAC=n
+CONFIG_EXAMPLE_NETTEST_IPADDR=(192<<24|168<<16|0<<8|128)
+CONFIG_EXAMPLE_NETTEST_DRIPADDR=(192<<24|168<<16|0<<8|1)
+CONFIG_EXAMPLE_NETTEST_NETMASK=(255<<24|255<<16|255<<8|0)
+CONFIG_EXAMPLE_NETTEST_CLIENTIP=(192<<24|168<<16|0<<8|106)
+
+#
+# Settings for examples/ostest
+#
+CONFIG_EXAMPLES_OSTEST_LOOPS=100
+CONFIG_EXAMPLES_OSTEST_STACKSIZE=8192
+
+#
+# Settings for apps/nshlib
+CONFIG_NSH_CONSOLE=y
+CONFIG_NSH_TELNET=n
+CONFIG_NSH_IOBUFFER_SIZE=512
+CONFIG_NSH_CMD_SIZE=40
+CONFIG_NSH_STACKSIZE=4096
+CONFIG_NSH_DHCPC=n
+CONFIG_NSH_NOMAC=n
+CONFIG_NSH_IPADDR=(10<<24|0<<16|0<<8|2)
+CONFIG_NSH_DRIPADDR=(10<<24|0<<16|0<<8|1)
+CONFIG_NSH_NETMASK=(255<<24|255<<16|255<<8|0)
+
+#
+# Various FS, NXFFS, RAMMTD and other settings needed for
+# apps/examples/nxffs
+#
+CONFIG_FS_NXFFS=y
+CONFIG_NXFFS_ERASEDSTATE=0xff
+CONFIG_NXFSS_PREALLOCATED=y
+CONFIG_RAMMTD_BLOCKSIZE=512
+CONFIG_RAMMTD_ERASESIZE=4096
+CONFIG_RAMMTD_ERASESTATE=0xff
+CONFIG_EXAMPLES_NXFFS_NEBLOCKS=32
+
+#
+# Stack and heap information
+#
+# CONFIG_BOOT_RUNFROMFLASH - Some configurations support XIP
+#   operation from FLASH but must copy initialized .data sections to RAM.
+# CONFIG_BOOT_COPYTORAM -  Some configurations boot in FLASH
+#   but copy themselves entirely into RAM for better performance.
+# CONFIG_CUSTOM_STACK - The up_ implementation will handle
+#   all stack operations outside of the nuttx model.
+# CONFIG_STACK_POINTER - The initial stack pointer
+# CONFIG_IDLETHREAD_STACKSIZE - The size of the initial stack.
+#  This is the thread that (1) performs the inital boot of the system up
+#  to the point where user_start() is spawned, and (2) there after is the
+#  IDLE thread that executes only when there is no other thread ready to
+#  run.
+# CONFIG_USERMAIN_STACKSIZE - The size of the stack to allocate
+#  for the main user thread that begins at the user_start() entry point.
+# CONFIG_PTHREAD_STACK_MIN - Minimum pthread stack size
+# CONFIG_PTHREAD_STACK_DEFAULT - Default pthread stack size
+# CONFIG_HEAP_BASE - The beginning of the heap
+# CONFIG_HEAP_SIZE - The size of the heap
+#
+CONFIG_BOOT_RUNFROMFLASH=n
+CONFIG_BOOT_COPYTORAM=n
+CONFIG_CUSTOM_STACK=n
+CONFIG_IDLETHREAD_STACKSIZE=4096
+CONFIG_USERMAIN_STACKSIZE=4096
+CONFIG_PTHREAD_STACK_MIN=256
+CONFIG_PTHREAD_STACK_DEFAULT=8192
+CONFIG_HEAP_BASE=
+CONFIG_HEAP_SIZE=
diff --git a/nuttx/configs/sim/nxffs/setenv.sh b/nuttx/configs/sim/nxffs/setenv.sh
new file mode 100755
index 0000000000..2733778439
--- /dev/null
+++ b/nuttx/configs/sim/nxffs/setenv.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+# confisgs/sim/nxffs/setenv.sh
+#
+#   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+if [ "$(basename $0)" = "setenv.sh" ] ; then
+  echo "You must source this script, not run it!" 1>&2
+  exit 1
+fi
+
+if [ -z ${PATH_ORIG} ]; then export PATH_ORIG=${PATH}; fi
+
+#export NUTTX_BIN=
+#export PATH=${NUTTX_BIN}:/sbin:/usr/sbin:${PATH_ORIG}
+
+echo "PATH : ${PATH}"
diff --git a/nuttx/drivers/mtd/rammtd.c b/nuttx/drivers/mtd/rammtd.c
index 5bdfa50179..6a2e1f4c20 100644
--- a/nuttx/drivers/mtd/rammtd.c
+++ b/nuttx/drivers/mtd/rammtd.c
@@ -168,20 +168,22 @@ static ssize_t ram_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t nbl
 {
   FAR struct ram_dev_s *priv = (FAR struct ram_dev_s *)dev;
   off_t offset;
+  off_t maxblock;
   size_t nbytes;
 
   DEBUGASSERT(dev && buf);
 
   /* Don't let the read exceed the size of the ram buffer */
 
-  if (startblock >= priv->nblocks)
+  maxblock = priv->nblocks * CONFIG_RAMMTD_BLKPER;
+  if (startblock >= maxblock)
     {
       return 0;
     }
 
-  if (startblock + nblocks >= priv->nblocks)
+  if (startblock + nblocks > maxblock)
     {
-      nblocks = priv->nblocks - nblocks;
+      nblocks = maxblock - startblock;
     }
 
   /* Get the offset corresponding to the first block and the size
@@ -201,25 +203,27 @@ static ssize_t ram_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t nbl
  * Name: ram_bwrite
  ****************************************************************************/
 
-static ssize_t ram_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks,
-                           FAR const uint8_t *buf)
+static ssize_t ram_bwrite(FAR struct mtd_dev_s *dev, off_t startblock,
+                          size_t nblocks, FAR const uint8_t *buf)
 {
   FAR struct ram_dev_s *priv = (FAR struct ram_dev_s *)dev;
   off_t offset;
+  off_t maxblock;
   size_t nbytes;
 
   DEBUGASSERT(dev && buf);
 
   /* Don't let the write exceed the size of the ram buffer */
 
-  if (startblock >= priv->nblocks)
+  maxblock = priv->nblocks * CONFIG_RAMMTD_BLKPER;
+  if (startblock >= maxblock)
     {
       return 0;
     }
 
-  if (startblock + nblocks >= priv->nblocks)
+  if (startblock + nblocks > maxblock)
     {
-      nblocks = priv->nblocks - nblocks;
+      nblocks = maxblock - startblock;
     }
 
   /* Get the offset corresponding to the first block and the size
diff --git a/nuttx/fs/nxffs/Make.defs b/nuttx/fs/nxffs/Make.defs
index 88c3d9cee9..6409c23bcf 100644
--- a/nuttx/fs/nxffs/Make.defs
+++ b/nuttx/fs/nxffs/Make.defs
@@ -37,7 +37,8 @@ ifeq ($(CONFIG_FS_NXFFS),y)
 ASRCS +=
 CSRCS += nxffs_block.c nxffs_blockstats.c nxffs_cache.c nxffs_dirent.c \
 		 nxffs_initialize.c nxffs_inode.c nxffs_ioctl.c nxffs_open.c \
-		 nxffs_reformat.c nxffs_stat.c nxffs_unlink.c nxffs_util.c
+		 nxffs_read.c nxffs_reformat.c nxffs_stat.c nxffs_unlink.c \
+		 nxffs_util.c nxffs_write.c
 
 # Argument for dependency checking
 
diff --git a/nuttx/fs/nxffs/README.txt b/nuttx/fs/nxffs/README.txt
index a2577e1f8e..cdbea34ca6 100755
--- a/nuttx/fs/nxffs/README.txt
+++ b/nuttx/fs/nxffs/README.txt
@@ -92,3 +92,9 @@ that you should be aware before opting to use NXFFS:
 6. The clean-up process occurs only during a write when the free FLASH

    memory at the end of the FLASH is exhausted.  Thus, occasionally, file

    writing may take a long time.

+

+7. Another limitation is that there can be only a single NXFFS volume

+   mounted at any time.  This has to do with the fact that we bind to

+   an MTD driver (instead of a block driver) and bypass all of the normal

+   mount operations.

+

diff --git a/nuttx/fs/nxffs/nxffs.h b/nuttx/fs/nxffs/nxffs.h
index 4f903a072e..5b1809ebc9 100644
--- a/nuttx/fs/nxffs/nxffs.h
+++ b/nuttx/fs/nxffs/nxffs.h
@@ -50,19 +50,11 @@
 #include <semaphore.h>
 
 #include <nuttx/mtd.h>
+#include <nuttx/nxffs.h>
 
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
-/* Configuration ************************************************************/
-#ifndef CONFIG_NXFFS_ERASEDSTATE
-#  define CONFIG_NXFFS_ERASEDSTATE 0xff
-#endif
-
-#if CONFIG_NXFFS_ERASEDSTATE != 0xff && CONFIG_NXFFS_ERASEDSTATE != 0x00
-#  error "CONFIG_NXFFS_ERASEDSTATE must be either 0x00 or 0xff"
-#endif
-
 /* NXFFS Definitions ********************************************************/
 /* General NXFFS organization.  The following example assumes 4 logical
  * blocks per FLASH erase block.  The actual relationship is determined by
@@ -141,6 +133,10 @@
  * 6. The clean-up process occurs only during a write when the free FLASH
  *    memory at the end of the FLASH is exhausted.  Thus, occasionally, file
  *    writing may take a long time.
+ * 7. Another limitation is that there can be only a single NXFFS volume
+ *    mounted at any time.  This has to do with the fact that we bind to
+ *    an MTD driver (instead of a block driver) and bypass all of the normal
+ *    mount operations.
  */
 
 /* Values for logical block state.  Basically, there are only two, perhaps
@@ -149,19 +145,25 @@
  * BLOCK_STATE_GOOD - The block is not known to be bad.
  * BLOCK_STATE_BAD  - An error was found on the block and it is marked bad.
  * Other values     - The block is bad and has an invalid state.
+ *
+ * Care is taken so that the GOOD to BAD transition only involves burning
+ * bits from the erased to non-erased state.
  */
 
-#define BLOCK_STATE_GOOD          CONFIG_NXFFS_ERASEDSTATE
-#define BLOCK_STATE_BAD           0xaa
+#define BLOCK_STATE_GOOD          (CONFIG_NXFFS_ERASEDSTATE ^ 0x44)
+#define BLOCK_STATE_BAD           (CONFIG_NXFFS_ERASEDSTATE ^ 0x55)
 
 /* Values for NXFFS inode state.  Similar there are 2 (maybe 3) inode states:
  *
  * INODE_STATE_FILE    - The inode is a valid usuable, file
  * INODE_STATE_DELETED - The inode has been deleted.
+ *
+ * Care is taken so that the GOOD to BAD transition only involves burning
+ * bits from the erased to non-erased state.
  */
 
-#define INODE_STATE_FILE          CONFIG_NXFFS_ERASEDSTATE
-#define INODE_STATE_DELETED       0x55
+#define INODE_STATE_FILE          (CONFIG_NXFFS_ERASEDSTATE ^ 0x22)
+#define INODE_STATE_DELETED       (CONFIG_NXFFS_ERASEDSTATE ^ 0xaa)
 
 /* Number of bytes in an the NXFFS magic sequences */
 
@@ -316,6 +318,18 @@ extern const uint8_t g_inodemagic[NXFFS_MAGICSIZE];
 
 extern const uint8_t g_datamagic[NXFFS_MAGICSIZE];
 
+/* If CONFIG_NXFSS_PREALLOCATED is defined, then this is the single, pre-
+ * allocated NXFFS volume instance.
+ */
+
+#ifdef CONFIG_NXFSS_PREALLOCATED
+extern struct nxffs_volume_s g_volume;
+#endif
+
+/* A singly-linked list of open files */
+
+extern struct nxffs_ofile_s *g_ofiles;
+
 /****************************************************************************
  * Public Function Prototypes
  ****************************************************************************/
@@ -474,12 +488,14 @@ extern int nxffs_getc(FAR struct nxffs_volume_s *volume);
  *
  * Description:
  *   Read a sequence of data bytes from the FLASH memory.  This function
- *   allows the data in the formatted FLASH blocks to be read as a continuous\
+ *   allows the data in the formatted FLASH blocks to be read as a continuous
  *   byte stream, skipping over bad blocks and block headers as necessary.
  *
  * Input Parameters:
  *   volume - Describes the NXFFS volume.  The paramters ioblock and iooffset
  *     in the volume structure determine the behavior of nxffs_getc().
+ *   buffer - A pointer to memory to receive the data read from FLASH.
+ *   buflen - The maximum number of bytes to read from FLASH.
  *
  * Returned Value:
  *   The number of bytes read is returned on success.  Otherwise, a negated
@@ -493,6 +509,29 @@ extern ssize_t nxffs_rddata(FAR struct nxffs_volume_s *volume,
                             FAR uint8_t *buffer, size_t buflen);
 
 /****************************************************************************
+ * Name: nxffs_wrdata
+ *
+ * Description:
+ *   Write a sequence of data bytes into volume cache memory.  Nothing is
+ *   actually written to FLASH!  This function allows the data in the formatted
+ *   FLASH blocks to be read as a continuous byte stream, skipping over bad 
+ *   blocks and block headers as necessary.
+ *
+ * Input Parameters:
+ *   volume - Describes the NXFFS volume.
+ *   buffer - A pointer to memory to containing the data to write to FLASH.
+ *   buflen - The maximum number of bytes to write to FLASH.
+ *
+ * Returned Value:
+ *   The number of bytes written is returned on success.  Otherwise, a negated
+ *   errno indicating the nature of the failure.
+ *
+ ****************************************************************************/
+
+extern ssize_t nxffs_wrdata(FAR struct nxffs_volume_s *volume,
+                            FAR const uint8_t *buffer, size_t buflen);
+
+/****************************************************************************
  * Name: nxffs_freeentry
  *
  * Description:
@@ -700,9 +739,12 @@ extern int nxffs_rminode(FAR struct nxffs_volume_s *volume, FAR const char *name
  *   See include/nuttx/fs.h
  *
  * - nxffs_open() and nxffs_close() are defined in nxffs_open.c
+ * - nxffs_read() is defined in nxffs_read.c
+ * - nxffs_write() is defined in nxffs_write.c
  * - nxffs_ioctl() is defined in nxffs_ioctl.c
  * - nxffs_opendir(), nxffs_readdir(), and nxffs_rewindir() are defined in
  *   nxffs_dirent.c
+ * - nxffs_bind() and nxffs_unbind() are defined in nxffs_initialize.c
  * - nxffs_stat() and nxffs_statfs() are defined in nxffs_stat.c
  * - nxffs_unlink() is defined nxffs_unlink.c
  *
diff --git a/nuttx/fs/nxffs/nxffs_blockstats.c b/nuttx/fs/nxffs/nxffs_blockstats.c
index 8ad6f09787..9f7ca3af7f 100644
--- a/nuttx/fs/nxffs/nxffs_blockstats.c
+++ b/nuttx/fs/nxffs/nxffs_blockstats.c
@@ -116,7 +116,7 @@ int nxffs_blockstats(FAR struct nxffs_volume_s *volume,
 
       for (bptr = volume->cache, lblock = 0;
            lblock < volume->blkper;
-           bptr += SIZEOF_NXFFS_BLOCK_HDR, lblock++)
+           bptr += volume->geo.blocksize, lblock++)
         {
           FAR struct nxffs_block_s *blkhdr = (FAR struct nxffs_block_s*)bptr;
 
diff --git a/nuttx/fs/nxffs/nxffs_cache.c b/nuttx/fs/nxffs/nxffs_cache.c
index a2774ddfd6..f149de7cb3 100644
--- a/nuttx/fs/nxffs/nxffs_cache.c
+++ b/nuttx/fs/nxffs/nxffs_cache.c
@@ -95,7 +95,7 @@ int nxffs_rdcache(FAR struct nxffs_volume_s *volume, off_t block,
 
   /* Check if the requested data is already in the cache */
 
-  if (block != volume->cblock || nblocks <= volume->ncached)
+  if (block != volume->cblock || nblocks > volume->ncached)
     {
       /* Read the specified blocks into cache */
 
@@ -229,12 +229,14 @@ int nxffs_getc(FAR struct nxffs_volume_s *volume)
  *
  * Description:
  *   Read a sequence of data bytes from the FLASH memory.  This function
- *   allows the data in the formatted FLASH blocks to be read as a continuous\
+ *   allows the data in the formatted FLASH blocks to be read as a continuous
  *   byte stream, skipping over bad blocks and block headers as necessary.
  *
  * Input Parameters:
  *   volume - Describes the NXFFS volume.  The paramters ioblock and iooffset
  *     in the volume structure determine the behavior of nxffs_getc().
+ *   buffer - A pointer to memory to receive the data read from FLASH.
+ *   buflen - The maximum number of bytes to read from FLASH.
  *
  * Returned Value:
  *   The number of bytes read is returned on success.  Otherwise, a negated
@@ -267,3 +269,29 @@ ssize_t nxffs_rddata(FAR struct nxffs_volume_s *volume,
   return buflen;
 }
 
+/****************************************************************************
+ * Name: nxffs_wrdata
+ *
+ * Description:
+ *   Write a sequence of data bytes into volume cache memory.  Nothing is
+ *   actually written to FLASH!  This function allows the data in the formatted
+ *   FLASH blocks to be read as a continuous byte stream, skipping over bad 
+ *   blocks and block headers as necessary.
+ *
+ * Input Parameters:
+ *   volume - Describes the NXFFS volume.
+ *   buffer - A pointer to memory to containing the data to write to FLASH.
+ *   buflen - The maximum number of bytes to write to FLASH.
+ *
+ * Returned Value:
+ *   The number of bytes written is returned on success.  Otherwise, a negated
+ *   errno indicating the nature of the failure.
+ *
+ ****************************************************************************/
+
+ssize_t nxffs_wrdata(FAR struct nxffs_volume_s *volume,
+                     FAR const uint8_t *buffer, size_t buflen)
+{
+#warning "Missing Logic"
+  return -ENOSYS;
+}
diff --git a/nuttx/fs/nxffs/nxffs_initialize.c b/nuttx/fs/nxffs/nxffs_initialize.c
index 8d96ffa158..fc2d97b658 100644
--- a/nuttx/fs/nxffs/nxffs_initialize.c
+++ b/nuttx/fs/nxffs/nxffs_initialize.c
@@ -41,6 +41,7 @@
 
 #include <nuttx/config.h>
 
+#include <string.h>
 #include <errno.h>
 #include <assert.h>
 #include <debug.h>
@@ -119,6 +120,14 @@ const uint8_t g_inodemagic[NXFFS_MAGICSIZE] = { 'I', 'n', 'o', 'd' };
 
 const uint8_t g_datamagic[NXFFS_MAGICSIZE] = { 'D', 'a', 't', 'a' };
 
+/* If CONFIG_NXFSS_PREALLOCATED is defined, then this is the single, pre-
+ * allocated NXFFS volume instance.
+ */
+
+#ifdef CONFIG_NXFSS_PREALLOCATED
+struct nxffs_volume_s g_volume;
+#endif
+
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -135,19 +144,31 @@ const uint8_t g_datamagic[NXFFS_MAGICSIZE] = { 'D', 'a', 't', 'a' };
  *
  * Input Parameters:
  *   mtd - The MTD device that supports the FLASH interface.
- *   start - The first block of the file system begins at this block number
- *     in the FLASH
- *   nblocks - This number of blocks is set aside for the file system.
+ *
+ * Returned Value:
+ *   Zero is returned on success.  Otherwise, a negated errno value is
+ *   returned to indicate the nature of the failure.
  *
  ****************************************************************************/
 
-int nxffs_initialize(FAR struct mtd_dev_s *mtd, off_t start, off_t nblocks)
+int nxffs_initialize(FAR struct mtd_dev_s *mtd)
 {
   FAR struct nxffs_volume_s *volume;
   struct nxffs_blkstats_s stats;
   off_t threshold;
   int ret;
 
+  /* If CONFIG_NXFSS_PREALLOCATED is defined, then this is the single, pre-
+   * allocated NXFFS volume instance.
+   */
+
+#ifdef CONFIG_NXFSS_PREALLOCATED
+
+  volume = &g_volume;
+  memset(volume, 0, sizeof(struct nxffs_volume_s));
+
+#else
+
   /* Allocate a NXFFS volume structure */
 
   volume = (FAR struct nxffs_volume_s *)kzalloc(sizeof(struct nxffs_volume_s));
@@ -156,6 +177,7 @@ int nxffs_initialize(FAR struct mtd_dev_s *mtd, off_t start, off_t nblocks)
       ret = -ENOMEM;
       goto errout;
     }
+#endif
 
   /* Initialize the NXFFS volume structure */
 
@@ -175,7 +197,7 @@ int nxffs_initialize(FAR struct mtd_dev_s *mtd, off_t start, off_t nblocks)
 
   /* Allocate one, in-memory erase block buffer */
 
-  volume->cache  = (FAR uint8_t *)kmalloc(volume->geo.erasesize);
+  volume->cache = (FAR uint8_t *)kmalloc(volume->geo.erasesize);
   if (!volume->cache)
     {
       fdbg("Failed to allocate an erase block buffer\n");
@@ -238,7 +260,6 @@ errout_with_iobuffer:
   kfree(volume->cache);
 errout_with_volume:
   kfree(volume);
-errout:
   return ret;
 }
 
@@ -400,3 +421,60 @@ int nxffs_limits(FAR struct nxffs_volume_s *volume)
   return OK;
 }
 
+/****************************************************************************
+ * Name: nxffs_bind
+ *
+ * Description:
+ *   This function implements a portion of the mount operation. Normmally,
+ *   the bind() method allocates and initializes the mountpoint private data
+ *   then binds the blockdriver inode to the filesystem private data.  The
+ *   final binding of the private data (containing the blockdriver) to the
+ *   mountpoint is performed by mount().
+ *
+ *   For the NXFFS, this sequence is quite different for the following
+ *   reasons:
+ *
+ *   1. A block driver is not used.  Instead, an MTD instance was provided
+ *      to nxfs_initialize prior to mounting.  So, in this sense, the NXFFS
+ *      file system is already bound.
+ *
+ *   2. Since the volume was already bound to the MTD driver, all allocations
+ *      and initializations have already been performed.  Essentially, all
+ *      mount operations have been bypassed and now we just need to provide
+ *      the pre-allocated volume instance.
+ *
+ *   3. The tricky thing is that there is no mechanism to associate multiple
+ *      NXFFS volumes to the multiple volumes bound to different MTD drivers.
+ *      Hence, the limitation of a single NXFFS volume.
+ *
+ ****************************************************************************/
+
+int nxffs_bind(FAR struct inode *blkdriver, FAR const void *data,
+               FAR void **handle)
+{
+#ifndef CONFIG_NXFSS_PREALLOCATED
+#  error "No design to support dynamic allocation of volumes"
+#else
+
+  /* If CONFIG_NXFSS_PREALLOCATED is defined, then this is the single, pre-
+   * allocated NXFFS volume instance.
+   */
+
+  DEBUGASSERT(g_volume.cache);
+  *handle = &g_volume;
+#endif
+  return OK;
+}
+
+/****************************************************************************
+ * Name: nxffs_unbind
+ *
+ * Description: This implements the filesystem portion of the umount
+ *   operation.
+ *
+ ****************************************************************************/
+
+int nxffs_unbind(FAR void *handle, FAR struct inode **blkdriver)
+{
+  return g_ofiles ? -EBUSY : OK;
+}
diff --git a/nuttx/fs/nxffs/nxffs_open.c b/nuttx/fs/nxffs/nxffs_open.c
index 88bfbf3ff6..f057ab4bc7 100644
--- a/nuttx/fs/nxffs/nxffs_open.c
+++ b/nuttx/fs/nxffs/nxffs_open.c
@@ -65,14 +65,14 @@
  * Public Variables
  ****************************************************************************/
 
+/* A singly-linked list of open files */
+
+struct nxffs_ofile_s *g_ofiles;
+
 /****************************************************************************
  * Private Variables
  ****************************************************************************/
 
-/* A singly-linked list of open files */
-
-static struct nxffs_ofile_s *g_ofiles;
-
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
diff --git a/nuttx/fs/nxffs/nxffs_read.c b/nuttx/fs/nxffs/nxffs_read.c
new file mode 100644
index 0000000000..d8c2e95672
--- /dev/null
+++ b/nuttx/fs/nxffs/nxffs_read.c
@@ -0,0 +1,174 @@
+/****************************************************************************
+ * fs/nxffs/nxffs_read.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * References: Linux/Documentation/filesystems/romfs.txt
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+#include <fcntl.h>
+#include <assert.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/fs.h>
+#include <nuttx/mtd.h>
+
+#include "nxffs.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nxffs_rdseek
+ *
+ * Description:
+ *   Seek to the file position before read or write access.  Note that the
+ *   simplier nxffs_ioseek() cannot be used for this purpose.  File offsets
+ *   are not easily mapped to FLASH offsets due to intervening block and
+ *   data headers.
+ *
+ * Input Parameters:
+ *   volume - Describes the current volume
+ *   entry  - Describes the open inode
+ *   fpos   - The desired file position
+ *
+ ****************************************************************************/
+
+static ssize_t nxffs_rdseek(FAR struct nxffs_volume_s *volume,
+                            FAR struct nxffs_entry_s *entry,
+                            off_t fpos)
+{
+#warning "Missing Logic"
+  return 0;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+/****************************************************************************
+ * Name: nxffs_read
+ *
+ * Description:
+ *   This is an implementation of the NuttX standard file system read
+ *   method.
+ *
+ ****************************************************************************/
+
+ssize_t nxffs_read(FAR struct file *filep, FAR char *buffer, size_t buflen)
+{
+  FAR struct nxffs_volume_s *volume;
+  FAR struct nxffs_ofile_s *ofile;
+  ssize_t ret;
+
+  fvdbg("Read %d bytes from offset %d\n", buflen, filep->f_pos);
+
+  /* Sanity checks */
+
+  DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
+
+  /* Recover the open file state from the struct file instance */
+
+  ofile = (FAR struct nxffs_ofile_s *)filep->f_priv;
+
+  /* Recover the volume state from the open file */
+
+  volume = (FAR struct nxffs_volume_s *)filep->f_inode->i_private;
+  DEBUGASSERT(volume != NULL);
+
+  /* Get exclusive access to the volume.  Note that the volume exclsem
+   * protects the open file list.
+   */
+
+  ret = sem_wait(&volume->exclsem);
+  if (ret != OK)
+    {
+      ret = -errno;
+      fdbg("sem_wait failed: %d\n", ret);
+      goto errout;
+    }
+
+  /* Check if the file was opened with read access */
+
+  if ((ofile->mode & O_RDOK) == 0)
+    {
+      fdbg("File not open for read access\n");
+      ret = -EACCES;
+      goto errout_with_semaphore;
+    }
+
+  /* Seek to the current file offset */
+
+  ret = nxffs_rdseek(volume, &ofile->entry, filep->f_pos);
+  if (ret < 0)
+    {
+      fdbg("nxffs_fwseek failed: %d\n", -ret);
+      ret = -EACCES;
+      goto errout_with_semaphore;
+    }
+
+  /* Read data from that file offset */
+
+  ret = nxffs_rddata(volume, (FAR uint8_t *)buffer, buflen);
+  if (ret > 0)
+    {
+      /* Update the file offset */
+
+      filep->f_pos += ret;
+    }
+
+errout_with_semaphore:
+  sem_post(&volume->exclsem);
+errout:
+  return ret;
+}
+
diff --git a/nuttx/fs/nxffs/nxffs_reformat.c b/nuttx/fs/nxffs/nxffs_reformat.c
index 8f34a93734..672d578667 100644
--- a/nuttx/fs/nxffs/nxffs_reformat.c
+++ b/nuttx/fs/nxffs/nxffs_reformat.c
@@ -95,7 +95,7 @@ static int nxffs_format(FAR struct nxffs_volume_s *volume)
   memset(volume->cache, CONFIG_NXFFS_ERASEDSTATE, volume->geo.erasesize);
   for (blkptr = volume->cache, i = 0;
        i < volume->blkper;
-       blkptr += SIZEOF_NXFFS_BLOCK_HDR, i++)
+       blkptr += volume->geo.blocksize, i++)
     {
       FAR struct nxffs_block_s *blkhdr = (FAR struct nxffs_block_s*)blkptr;
       memcpy(blkhdr->magic, g_blockmagic, NXFFS_MAGICSIZE);
@@ -121,7 +121,7 @@ static int nxffs_format(FAR struct nxffs_volume_s *volume)
       nxfrd = MTD_BWRITE(volume->mtd, lblock, volume->blkper, volume->cache);
       if (nxfrd != volume->blkper)
         {
-          fdbg("Write erase block %d failed: %d\n", alignedblock, nxfrd);
+          fdbg("Write erase block %d failed: %d\n", lblock, nxfrd);
           return -EIO;
         }
     }
@@ -176,7 +176,7 @@ static int nxffs_badblocks(FAR struct nxffs_volume_s *volume)
       modified = false;
       for (blkptr = volume->cache, i = 0;
            i < volume->blkper;
-           blkptr += SIZEOF_NXFFS_BLOCK_HDR, i++)
+           blkptr += volume->geo.blocksize, i++)
         {
           FAR struct nxffs_block_s *blkhdr = (FAR struct nxffs_block_s*)blkptr;
 
@@ -184,7 +184,7 @@ static int nxffs_badblocks(FAR struct nxffs_volume_s *volume)
 
           bad = false;
           if (memcmp(blkhdr->magic, g_blockmagic, NXFFS_MAGICSIZE) != 0 ||
-              blkhdr->state == BLOCK_STATE_GOOD)
+              blkhdr->state != BLOCK_STATE_GOOD)
             {
               bad = true;;
             }
@@ -228,7 +228,7 @@ static int nxffs_badblocks(FAR struct nxffs_volume_s *volume)
       nxfrd = MTD_BWRITE(volume->mtd, lblock, volume->blkper, volume->cache);
       if (nxfrd != volume->blkper)
         {
-          fdbg("Write erase block %d failed: %d\n", alignedblock, nxfrd);
+          fdbg("Write erase block %d failed: %d\n", lblock, nxfrd);
           return -EIO;
         }
     }
diff --git a/nuttx/fs/nxffs/nxffs_write.c b/nuttx/fs/nxffs/nxffs_write.c
new file mode 100644
index 0000000000..363a1d60fd
--- /dev/null
+++ b/nuttx/fs/nxffs/nxffs_write.c
@@ -0,0 +1,147 @@
+/****************************************************************************
+ * fs/nxffs/nxffs_write.c
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * References: Linux/Documentation/filesystems/romfs.txt
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+#include <fcntl.h>
+#include <assert.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/fs.h>
+#include <nuttx/mtd.h>
+
+#include "nxffs.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nxffs_write
+ *
+ * Description:
+ *   This is an implementation of the NuttX standard file system write
+ *   method.
+ *
+ ****************************************************************************/
+
+ssize_t nxffs_write(FAR struct file *filep, FAR const char *buffer, size_t buflen)
+{
+  FAR struct nxffs_volume_s *volume;
+  FAR struct nxffs_wrfile_s *wrfile;
+  ssize_t ret;
+
+  fvdbg("Write %d bytes to offset %d\n", buflen, filep->f_pos);
+
+  /* Sanity checks */
+
+  DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
+
+  /* Recover the open file state from the struct file instance */
+
+  wrfile = (FAR struct nxffs_wrfile_s *)filep->f_priv;
+
+  /* Recover the volume state from the open file */
+
+  volume = (FAR struct nxffs_volume_s *)filep->f_inode->i_private;
+  DEBUGASSERT(volume != NULL);
+
+  /* Get exclusive access to the volume.  Note that the volume exclsem
+   * protects the open file list.
+   */
+
+  ret = sem_wait(&volume->exclsem);
+  if (ret != OK)
+    {
+      ret = -errno;
+      fdbg("sem_wait failed: %d\n", ret);
+      goto errout;
+    }
+
+  /* Check if the file was opened with write access */
+
+#ifdef CONFIG_DEBUG
+  if ((wrfile->ofile.mode & O_WROK) == 0)
+    {
+      fdbg("File not open for write access\n");
+      ret = -EACCES;
+      goto errout_with_semaphore;
+    }
+#endif
+
+  /* Seek to the current file offset */
+
+  nxffs_ioseek(volume, wrfile->dathdr + wrfile->wrlen);
+
+  /* Write data to that file offset */
+
+  ret = nxffs_wrdata(volume, (FAR const uint8_t*)buffer, buflen);
+  if (ret > 0)
+    {
+      /* Update the file offset */
+
+      filep->f_pos += ret;
+    }
+#warning "Add check for block full"
+
+errout_with_semaphore:
+  sem_post(&volume->exclsem);
+errout:
+  return ret;
+}
diff --git a/nuttx/include/nuttx/mtd.h b/nuttx/include/nuttx/mtd.h
index 2cf56a2b48..1acf0f530a 100644
--- a/nuttx/include/nuttx/mtd.h
+++ b/nuttx/include/nuttx/mtd.h
@@ -2,7 +2,7 @@
  * include/nuttx/mtd.h
  * Memory Technology Device (MTD) interface
  *
- *   Copyright (C) 2009-2010 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009-2011 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/nuttx/include/nuttx/nxffs.h b/nuttx/include/nuttx/nxffs.h
new file mode 100644
index 0000000000..e4625a0576
--- /dev/null
+++ b/nuttx/include/nuttx/nxffs.h
@@ -0,0 +1,104 @@
+/****************************************************************************
+ * include/nuttx/nxffs.h
+ *
+ *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_NXFFS_H
+#define __INCLUDE_NUTTX_NXFFS_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/fs.h>
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+/* Configuration ************************************************************/
+/* If the erased state of FLASH memory is anything other than 0xff, then this
+ * configuration should be provided.
+ */
+
+#ifndef CONFIG_NXFFS_ERASEDSTATE
+#  define CONFIG_NXFFS_ERASEDSTATE 0xff
+#endif
+
+#if CONFIG_NXFFS_ERASEDSTATE != 0xff && CONFIG_NXFFS_ERASEDSTATE != 0x00
+#  error "CONFIG_NXFFS_ERASEDSTATE must be either 0x00 or 0xff"
+#endif
+
+/* At present, only a single pre-allocated NXFFS volume is supported.  This
+ * is because here can be only a single NXFFS volume mounted at any time.
+ * This has to do with the fact that we bind to an MTD driver (instead of a
+ * block driver) and bypass all of the normal mount operations.
+ */
+
+#undef CONFIG_NXFSS_PREALLOCATED
+#define CONFIG_NXFSS_PREALLOCATED 1
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: nxffs_initialize
+ *
+ * Description:
+ *   Initialize to provide NXFFS on an MTD interface
+ *
+ * Input Parameters:
+ *   mtd - The MTD device that supports the FLASH interface.
+ *
+ * Returned Value:
+ *   Zero is returned on success.  Otherwise, a negated errno value is
+ *   returned to indicate the nature of the failure.
+ *
+ ****************************************************************************/
+
+EXTERN int nxffs_initialize(FAR struct mtd_dev_s *mtd);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __INCLUDE_NUTTX_NXFFS_H */