Re: [coreboot] Error executing VGA ROM with coreboot

> On Fri, 30 Oct 2009 10:11:36 +0530, "Mansoor" 
> wrote:
> > > -----Original Message-----
> > > From: Joe [mailto:[e-mail]]
> > > Sent: Thursday, October 29, 2009 7:32 PM
> > > To: Mansoor
> > > Cc: 'coreboot'
> > > Subject: Re: [coreboot] Error executing VGA ROM with coreboot
> > >
> > > On 10/29/2009 07:38 AM, Mansoor wrote:
> > > > Hi
> > > >
> > > > I keep getting "ILLEGAL EXTENDED X86 OPCODE!" from my VGA ROM while
> > > > trying run VGA ROM in coreboot.
> > > >
> > > > I tried x86emu, yabel and real mode for running VGA ROM with no luck.
> > > > But the same VGA ROM is running with seabios.
> > > >
> > > > I am attaching the boot logs with x86emu, real mode and with seabios.
> > > >
> > > > Any help?
> > > >
> > > > What is the big difference while executing VGA ROM in coreboot and
> > >
> > > seabios?
> > > > Why coreboot can't run a VGA ROM which seabios can?
> > >
> > > Hmm looks like your getting Unexpected Exception errors. Something is
> > > not initializing correctly. Memory maybe?
> >
> > I don't think so, because with seabios I am able to load Linux in GUI
>
> mode.
> > Only with coreboot I am facing these issues for initializing VGA ROM.
>
> You could always try Debugging the Unexpected Exception errors with GDB,
> this may give you a clue on what the problem is.
>
> http://www.coreboot.org/Debugging

Actually i tried GDB and failed to build the image.. I got  section
overlap error and was not able to solve it.

What i didnt understand is

Why coreboot can't run a VGA ROM which seabios can?
What is the big difference while executing VGA ROM in coreboot and
seabios?
> From the log you can see seabios emits some warning messages(fail

handle_155fXX) but still it continues to run the VGA ROM, where x86emu or
realmode hangs with error messages

in seabios
fail handle_155fXX:23(86):

a=a0005f38  b=000008c1  c=00000003  d=0000c000 ds=a000 es=c000 ss=a000

si=00000000 di=00000003 bp=000077cc sp=000077be cs=c000 ip=3115  f=0002

Real mode

Real mode stub @00000500: 422 bytes

Calling Option ROM...

oprom: INT# 0x8e41a854

oprom: eax: 8a000885 ebx: 0e21e039 ecx: 00028101 edx: 2989b606

oprom: ebp: 58000a58 esp: c0010004 edi: c668404c esi: c2650304

oprom:  ip: e6b0      cs: 8831   flags: 00002900

Unexpected Exception: 6 @ 10:f6fdd07d - Halting

Code: 0 eflags: 00010012

eax: 00007776 ebx: 00008831 ecx: 0010ef73 edx: 001059b1

edi: c0010004 esi: 8e41a854 ebp: 00002900 esp: 0000774a
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