diff options
| author | balrog <balrog@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-09-20 01:15:04 +0000 |
|---|---|---|
| committer | balrog <balrog@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-09-20 01:15:04 +0000 |
| commit | c9a33054bf589f1d78315100c645713b04bddc31 (patch) | |
| tree | 27fde9b9d5388ad945a6ee735f961861d8b2472c | |
| parent | 75554a3ca10a7ad295d2a3d2e14ee6ba90f94c8b (diff) | |
Add a comment about masking of CTI interrupt in 16550A UART.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5264 c046a42c-6fe2-441c-8c8c-71466251a162
| -rw-r--r-- | hw/serial.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/hw/serial.c b/hw/serial.c index 28d99f26c..2167b7983 100644 --- a/hw/serial.c +++ b/hw/serial.c @@ -192,6 +192,9 @@ static void serial_update_irq(SerialState *s) if ((s->ier & UART_IER_RLSI) && (s->lsr & UART_LSR_INT_ANY)) { tmp_iir = UART_IIR_RLSI; } else if ((s->ier & UART_IER_RDI) && s->timeout_ipending) { + /* Note that(s->ier & UART_IER_RDI) can mask this interrupt, + * this is not in the specification but is observed on existing + * hardware. */ tmp_iir = UART_IIR_CTI; } else if ((s->ier & UART_IER_RDI) && (s->lsr & UART_LSR_DR)) { if (!(s->fcr & UART_FCR_FE)) { |