Re: [LinuxBIOS] Advantech SOM-4455F

[Peter Stuge]

Going back on list..

On Sat, Jun 09, 2007 at 12:07:39AM +0600, Richard Neill Dabney wrote:
> The illegal instruction is in the callbiosint16 function where CR0
> is loaded to turn of protected mode.

Aha.
> I looked at the emulator code and sure enough, that sequence of
> 'movl %cr0,%eax' (0x0f, 0x20,0xc0) is illegal.
> It makes no sense. Did this ever work?

It does work for several other VGA BIOSes. They probably do not try
to switch to PM.

So I guess x86emu doesn't handle protected mode.

Could vm86 work instead of x86emu?

//Peter

[LinuxBIOS] Advantech SOM-4455F

[Stefan Reinauer]

* Peter Stuge  [070608 20:12]:
> It does work for several other VGA BIOSes. They probably do not try
> to switch to PM.
>
> So I guess x86emu doesn't handle protected mode.
>
> Could vm86 work instead of x86emu?

worth a try. The code could be ported over from via/epia-m.

Maybe we should have a generic driver doing this as an alternative, as
we have in v3?