diff options
| -rw-r--r-- | hw/char/pl011.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/hw/char/pl011.c b/hw/char/pl011.c index 23a9db8c57..0e9ec1301d 100644 --- a/hw/char/pl011.c +++ b/hw/char/pl011.c @@ -490,16 +490,17 @@ static int pl011_can_receive(void *opaque) unsigned fifo_depth = pl011_get_fifo_depth(s); unsigned fifo_available = fifo_depth - s->read_count; - if (!(s->cr & CR_UARTEN)) { - qemu_log_mask(LOG_GUEST_ERROR, - "PL011 receiving data on disabled UART\n"); - } - if (!(s->cr & CR_RXE)) { - qemu_log_mask(LOG_GUEST_ERROR, - "PL011 receiving data on disabled RX UART\n"); - } - trace_pl011_can_receive(s->lcr, s->read_count, fifo_depth, fifo_available); + /* + * In theory we should check the UART and RX enable bits here and + * return 0 if they are not set (so the guest can't receive data + * until you have enabled the UART). In practice we suspect there + * is at least some guest code out there which has been tested only + * on QEMU and which never bothers to enable the UART because we + * historically never enforced that. So we effectively keep the + * UART continuously enabled regardless of the enable bits. + */ + trace_pl011_can_receive(s->lcr, s->read_count, fifo_depth, fifo_available); return fifo_available; } |