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serial: Allow unaligned i/o access

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Unaligned i/o access on serial UART works on real PCs.
This is used for example by FreeDOS CTMouse driver. Without this it
can't reset and detect serial mice.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/77
Signed-off-by: Arwed Meyer <arwed.meyer@gmx.de>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20220911181840.8933-6-arwed.meyer@gmx.de>
This commit is contained in:
Arwed Meyer 2022-09-11 20:18:40 +02:00 committed by Marc-André Lureau
parent 50d03d4852
commit 769a726ccb
1 changed files with 3 additions and 0 deletions
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3
hw/char/serial.c
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@ -961,6 +961,9 @@ void serial_set_frequency(SerialState *s, uint32_t frequency)
const MemoryRegionOps serial_io_ops = {
.read = serial_ioport_read,
.write = serial_ioport_write,
.valid = {
.unaligned = 1,
},
.impl = {
.min_access_size = 1,
.max_access_size = 1,