[coreboot] U-Boot-x86 / coreboot Integration
kevin at koconnor.net
Wed May 11 05:20:00 CEST 2011
On Wed, May 11, 2011 at 01:12:16PM +1000, Graeme Russ wrote:
> >> > 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).
> What does Linux do? i.e. if you boot Linux from coreboot, how does it
> output to the VGA console? I know it uses BIOS early on (before switching
> to protected mode) but what does it do after entering protected mode?
In general, one enables the coreboot VGA option ROM emulation when
booting Linux directly from coreboot.
More information about the coreboot