[coreboot] Fwd: sgabios ans grub2 payload (without SeaBIOS)

[Stefan Reinauer]

* maxime de Roucy <maxime.deroucy at gmail.com> [151105 10:32]:
> ---------- Forwarded message ----------
> From: maxime de Roucy <maxime.deroucy at gmail.com>
> Date: 2015-11-05 10:25 GMT+01:00
> Subject: Re: [coreboot] sgabios ans grub2 payload (without SeaBIOS)
> To: Gerd Hoffmann <kraxel at redhat.com>
> 
> 2015-11-05 10:16 GMT+01:00 Gerd Hoffmann <kraxel at redhat.com>:
> > That isn't going to work I think.  sgabios works by hijaking vgabios,
> > and when loaded as coreboot payload grub2 probably will not try to use
> > vgabios in the first place ...
> 
> It works great when sgabios is run by SeaBIOS even if serial support
> disable in seabios and grub (so I am sure the serial output is
> generated by sgabios).

Without SeaBIOS there is no way of doing intXX callbacks after coreboot
is finished running, that is why you wouldn't see any output in that
case.

Your two options are indeed to put the serial (or whatever output) code
in grub2 directly, or use SeaBIOS as an intermediate step.

Stefan