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charset="utf-8" When the CCE engine is enabled, real hardware ignores any MMIO writes to GUI registers (0x1400-0x1fff range). Writes made by the CCE engine are not affected by this. Signed-off-by: Chad Jablonski --- hw/display/ati.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/display/ati.c b/hw/display/ati.c index a9fe0cd0d2..82450c0331 100644 --- a/hw/display/ati.c +++ b/hw/display/ati.c @@ -1131,6 +1131,13 @@ static void ati_mm_write(void *opaque, hwaddr addr, if (addr < CUR_OFFSET || addr > CUR_CLR1 || ATI_DEBUG_HW_CURSOR) { trace_ati_mm_write(size, addr, ati_reg_name(addr & ~3ULL), data); } + if (addr >=3D 0x1400 && addr <=3D 0x1fff && s->cce.buffer_mode !=3D 0)= { + qemu_log_mask(LOG_GUEST_ERROR, + "ati_mm_write: wrote 0x%lx to gui register 0x%lx while cce eng= ine enabled, ignored.\n", + data, addr); + return; + } + ati_reg_write(s, addr, data, size); } =20 --=20 2.51.2