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Add a comment about masking of CTI interrupt in 16550A UART.

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5264 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
balrog 2008-09-20 01:15:04 +00:00
parent 75554a3ca1
commit c9a33054bf
1 changed files with 3 additions and 0 deletions
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3
hw/serial.c
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@ -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)) {