Re: Proper support for PCI-based option rom loading (was Re: [Qemu-devel] Re: qdev property bug?)

[Sebastian Herbszt]

Anthony Liguori wrote:
> Gerd Hoffmann wrote:
> > I'm more worried about the CONFIG_OPTIONROMS_DEPLOYED patches for 
> > seabios, although I don't fully understand what they are doing.  There 
> > are non-pci option roms (linuxboot, multiboot, extboot) which qemu 
> > will continue to deploy the way roms are deployed today.
>
> That's a good point.  Need to think about how to best handle that.  
> SeaBIOS supports up to two static option roms so maybe what we need to 
> do is make use of that mechanism for things like linuxboot/extboot.

Keep loading custom roms (e.g. from -option-rom) with rom_add_file starting at 
0xc8000.
Modify SeaBIOS to scan the memory range for pre-deployed option roms before 
deploying
PCI roms. SeaBIOS will find the last pre-deployed rom and have a starting 
address for
deploying PCI roms. This will keep ISA option roms working.

- Sebastian