[coreboot] SeaBIOS, serial output, and grub
ward at gnu.org
Wed May 13 02:16:47 CEST 2009
On Thu, Apr 30, 2009 at 08:40:16PM -0600, Myles Watson wrote:
> On Thu, Apr 30, 2009 at 8:26 PM, Kevin O'Connor <kevin at koconnor.net> wrote:
> > On Thu, Apr 30, 2009 at 09:18:45PM -0400, Ward Vandewege wrote:
> >> So - here's the problem with the sgabios approach. Unless I'm
> >> misunderstanding how this works, using sgabios means that I'd have
> >> to disable serial in any payload started from grub, as well?
> > It seems to work fine under qemu. In any case, a seabios
> > implementation would have the same issues as sgabios - it would need
> > to do exactly what sgabios does.
> >> > > > > serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
> >> > > > > terminal --timeout=5 serial console
> > I've reproduced this problem under qemu. If I boot
> > qemu/coreboot/seabios/grub, then grub wont use the serial console.
> > However, if I boot qemu/seabios/grub, then grub seems to work fine.
> > The above is true regardless of whether SeaBIOS has serial port
> > debugging on or off. I guess coreboot is initialzing the serial port
> > in some way that grub doesn't like.
I'm seeing the exact same issue on m57sli (which is also mcp55 based,
however). Has anyone else tried coreboot + SeaBIOS + grub with serial?
Ward Vandewege <ward at fsf.org>
Free Software Foundation - Senior Systems Administrator
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