Hi Kevin On Wed, May 11, 2011 at 10:23 AM, Kevin O'Connor <ke...@koconnor.net> wrote: > On Wed, May 11, 2011 at 09:44:00AM +1000, Graeme Russ wrote: >> On Wed, May 11, 2011 at 2:08 AM, Peter Stuge <pe...@stuge.se> 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.
I don't see why - I'm sure U-Boot could launch it in exactly the same way coreboot does... Oh, I see - It will then start trying to boot the system oops ;) > >> > 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). How many functions are needed? (surely not all the IDE and keyboard stuff for example) - Could the bare minimum be implemented in a stripped-down modified SeaBIOS? All this because stupid hardware manufacturers refuse to release details of how to do even the most basic of functions with their hardware :( Regards, Graeme _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
