[OpenBIOS] Faulty Qemu SPARC64 IDE emulation?

[Igor Kovalenko]

On Thu, Dec 10, 2009 at 1:02 AM, Igor Kovalenko
<igor.v.kovalenko at gmail.com> wrote:
> On Thu, Dec 10, 2009 at 12:47 AM, Mark Cave-Ayland
> <mark.cave-ayland at siriusit.co.uk> wrote:
>> Igor Kovalenko wrote:
>>
>>> Well qemu's crash is a bug in qemu for sure. The garbage being written
>>> is probably due to device i/o mapping issues (could clash with
>>> physical ram mapped low) so is separate issue. Of course we will need
>>> to solve both :)
>>> Do you see screen garbage before crash?
>>
>> Yeah; a keyboard command error and a single letter "s" with -nographic:
>>
>> qemu: unsupported keyboard cmd=0x57
>> sSegmentation fault
>
> Do you run in graphics mode at all? The garbage I see is in qemu screen,
> due to framebuffer being mapped where data is loaded by milax code.
>
>> The segmentation fault is actually the Qemu host process dying. The VNC
>> display looks more interesting; it seems that something is writing all over
>> the screen memory just before the crash happens.
>>
>> I believe from Nick's email that he can also recreate this using latest
>> OpenBIOS SVN, a recent pull of Qemu and a Milax 0.3.2 ISO image.
>>

Please try this patch as well, helps clearing a few subtle memory issues.

openbios-forth-package-prevent-null-dereferences

- Prevent dereferencing page zero and complain about invalid handles

Signed-off-by: igor.v.kovalenko at gmail.com

-- 
Kind regards,
Igor V. Kovalenko
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