Hi, I was hitting the STOP 0x000000A5 error when attempting to boot Vista or similar (Server 2008, WinPE) on current qemu CVS. Googling suggested that this was a problem with the qemu BIOS not supporting ACPI 2.0.
Replacing pc-bios/bios.bin with the bios/BIOS-bochs-latest from current bochs CVS fixed the problem, and I am now able to boot these operating systems. This isn't a perfect solution, since the bochs BIOS is built without #define BX_QEMU. It looks as though the BIOS problem has been fixed upstream; could someone who knows what they're doing rebuild pc-bios/bios.bin from the latest bochs CVS and check it in to qemu CVS? Thanks, Michael (Not a mailing list member, so please do CC me on replies.)