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.me...@gmx.de> --- hw/char/serial.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/char/serial.c b/hw/char/serial.c index 7061aacbce..41b5e61977 100644 --- a/hw/char/serial.c +++ b/hw/char/serial.c @@ -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, -- 2.34.1
