Re: [Qemu-devel] OVMF Google Summer of Code ideas

[Kevin O'Connor]

On Tue, Mar 08, 2011 at 09:00:05AM -0800, Jordan Justen wrote:
> On Mon, Mar 7, 2011 at 23:18, Stefan Hajnoczi <address@hidden> wrote:
> > On Tue, Mar 8, 2011 at 12:54 AM, Jordan Justen <address@hidden> wrote:
> >> The biggest issue that you guys care about for OVMF is a lack of
> >> legacy bios compatibility (CSM).  There has been no progress in this
> >> area.  (However, it has now been suggested by someone on our dev list
> >> for a potential Google Summer of Code project.  We will have to see if
> >> anything comes of this...)
> >
> > That would be cool.  Is there a way to just embed SeaBIOS?  Or do the
> > UEFI APIs still need to be around when CSM kicks in?
> 
> Yes, the UEFI system is still in place.  The UEFI part still handles
> the majority of platform init, and calls into the CSM at various
> points.  The CSM returns back to UEFI for all CSM calls, except the
> legacy boot.

Is there a concise list of these various callbacks between UEFI and
CSM?

If SeaBIOS just needs to be loaded up for legacy boots, that doesn't
sound too difficult.  However, if SeaBIOS would need to translate
various BIOS calls into UEFI calls - that sounds like it could be
complex.

-Kevin