[Qemu-devel] Re: vgabios + qemu: issues and plans.

[Sebastian Herbszt]

Gerd Hoffmann wrote:
> > > First, I'd like to be able to load the vgabios via PCI ROM bar on all
> > > pci vga cards (stdvga, vmware, soon qxl).  The PCI ID in the bios has to
> > > match the PCI ID of the card, so we'll need a bunch of vga bios
> > > binaries, all identical except for the PCI ID.  Or we need some kind of
> > > binary patching.  Otherwise seabios will not load them from the PCI ROM
> > > bar.
> >
> > Make vga bios aware of all ids?
>
> Would work for the code doing the lfb address lookup.  But I don't think 
> the PCI option rom header allows multiple entries.

AFAIK it does not, but you can put multiple PCI option roms (concatenated)
on the BAR (see "6.3.1. PCI Expansion ROM Contents").

> > I also want to eliminate the magic number.
> > Boch vga bios is paravirtualized to get VBE address dynamically via a new
> > pci device with special pci device of device id 0x1234.
>
> 0x1234 happens to be the vendor id the qemu stdvga has.  Probably the 
> same is true for bochs.  So this code actually looks up the emulated vga 
> card ;)

Bochs and qemu use 0x1234:0x1111.

Sebastian

> > Are you meaning to follow bochs way?
>
> Yes.
>
> cheers,
>   Gerd