On 16/07/08 12:43 -0600, Myles Watson wrote: > On Fri, Jul 11, 2008 at 12:51 PM, Kevin O'Connor <[EMAIL PROTECTED]> wrote: > > On Fri, Jul 11, 2008 at 07:58:35PM +0200, Carl-Daniel Hailfinger wrote: > >> Can seabios somehow complement x86emu as a way to let certain > >> problematic VBIOS images run? > > > > If you mean run seabios under x86emu - I'm not sure. Seabios > > currently does its initialization in 32bit mode which x86emu may not > > like. > > > > If you mean using seabios to implement the option rom scan - then yes, > > I think this is what Stefan suggested and Zhang Rui is working on. If > > I understand correctly, they want to load the seabios blob into ram, > > have seabios do its init, run the option roms, and then jump back to > > coreboot for the rest of the boot. Presumably, coreboot would also > > use seabios to boot the machine if the user wanted that. > > > > The thing to be careful of here is making sure coreboot and seabios > > don't stomp on each other. This may not be such a big deal - seabios > > doesn't currently write to any ram above 1MiB - if coreboot didn't > > write to any ram below 1MiB after launching seabios then maybe it > > would work. > > I for one don't understand what needs to be done in coreboot after the > option ROM scans. It seems like it would help us discuss the possible > solutions if we could enumerate that. > > I don't think the Coreboot->SeaBIOS->Coreboot->Payload route means > that SeaBIOS has to return to Coreboot. It seems like Coreboot can > load whatever should come after SeaBIOS into RAM and have SeaBIOS jump > there.
This seems like semantics to me - the jmp will be to an arbitrary address - it doesn't really matter if it goes back to coreboot or if it goes to the payload. If it jumped to the payload, SeaBIOS will have to be told _where_ to jump anyway, since the payload can live anywhere. All we really need to do is set up an interface to pass a address to SeaBIOS, and then its up to coreboot to figure out what they want to do after SeaBIOS is done. Jordan -- Jordan Crouse Systems Software Development Engineer Advanced Micro Devices, Inc. -- coreboot mailing list [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
