On Wed, May 11, 2011 at 09:44:00AM +1000, Graeme Russ wrote: > On Wed, May 11, 2011 at 2:08 AM, Peter Stuge <[email protected]> wrote: > > Graeme Russ wrote: > >> - Do we care about legacy BIOS support (SeaBIOS) for now (I think > >> not)? > > > > IMO it is not relevant to the integration of coreboot and U-Boot. If > > a BIOS is needed by U-Boot itself or whatever it loads, then SeaBIOS > > must be used as payload for coreboot, and SeaBIOS will then start > > U-Boot after setting up the BIOS environment. > > Or U-Boot could load a SeaBIOS image and initialise it if needed. So > in a U-Boot script: > - If the target OS is GNU/Linux the load the Linux kernel image and go > - If the target OS is Windows (or any other OS which needs a BIOS) then > U-Boot first loads a SeaBIOS image and then loads the image for the > target OS (this may even be a 'GRUB' image for example)
That's possible to do, but would likely require some changes to SeaBIOS. > > for two or three graphics chipsets. SeaBIOS can initialize any VGA > > option ROM, but then you need SeaBIOS in the loop. > > Option ROMs are ageold technology and stupid, but they are still > > firmly entrenched in PC hardware. A BIOS was always there so everyone > > assumes it will always stay there, not very many question if > > something better could be done. > > Would be interesting to investigate implementing a stub in U-Boot to > initialise and use VGA option ROMs VGA option ROMs call BIOS functions. So, one needs a BIOS implementation (eg, SeaBIOS) or an emulator for them (eg, in coreboot). -Kevin -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
