Re: [Qemu-devel] Re: [PATCH 0/4] ppc: Fix PReP emulation

[Alexander Graf]

On 22.12.2010, at 00:51, Andreas Färber <address@hidden> wrote:

> Am 21.12.2010 um 01:46 schrieb Alexander Graf:
> 
>> On 21.12.2010, at 01:33, Andreas Färber wrote:
>> 
>>> OpenHack'Ware never worked for me before. Supposedly patched Linux kernels 
>>> loaded via -kernel, still searching for a working one though...
>>> 
>>> $ qemu-system-ppc -M prep -nographic
>>> ERROR: BUG caught...
>>> BIOS execution exception
>>> nip=0x05800000 msr=0x00002000 dar=0x00000000 dsisr=0x00000000
>>> Stopping execution
>>> 
>>> $ qemu-system-ppc -M prep -kernel .../vmlinuz-2.4.25 -nographic # 
>>> http://www.olifantasia.com/qemu/
>>> ERROR: BUG caught...
>>> BIOS execution exception
>>> nip=0x05800000 msr=0x00002000 dar=0x00000000 dsisr=0x00000000
>>> Stopping execution
>>> 
>>> $ qemu-system-ppc -M prep -kernel .../vmlinuz-2.4.25 -append 
>>> 'ide0=0x1f0,0x3f6,13 ide1=0x170,0x376,13 netdev=9,0x300,eth0 console=ttyS0 
>>> console=tty0 root=/dev/hda' -nographic
>>> ERROR: BUG caught...
>>> BIOS execution exception
>>> nip=0x05800000 msr=0x00002000 dar=0x00000000 dsisr=0x00000000
>>> Stopping execution
>>> 
>> 
>> This one boots for me on qemu from SLES10SP3 (0.8.2):
>> 
>> http://www.oszoo.org/wiki/index.php/Debian_Etch_ppc_(PowerPC)_-_Qemu_Ready
> 
> $ qemu-system-ppc -m 256 -M prep -kernel .../zImage.prep -hda 
> .../debian-ppc-qemu.qcow -nographic
> 
> shows same error as above.
> 
> Could this be due to the IRQ issue? The older kernel did expect IRQ 13 twice.
> I would expect it to get a little further before running into such an error...

Phew - I doubt it too. There have been quite some changes since it last worked 
I guess ;). First thing that sounds reasonable now would be to find a known 
good version and check when the interpreted code paths start to differ.

Alex

>