[SeaBIOS] [PATCH 0/5][RFC] Simultaneous multi-platform support

[David Woodhouse]

On Fri, 2013-02-08 at 18:02 -0500, Kevin O'Connor wrote:
> 
> >I'm not sure it would even work for CSM, because it would
> > probably be too big.
> 
> As an aside, is there a way to pass in the "init" sections to ovmf
> such that they don't prevent option roms from using the space?  Also,
> I briefly tried not padding bios.bin to a power of 2, but ovmf doesn't
> seem to like that.

I've already proposed the UmbStart and UmbEnd fields which the CSM can
use to mark the memory it needs to be writeable, and I've hard-coded
that to 0xe0000-0xf0000 for the SeaBIOS CSM build. That 0xe0000 should
actually be datalow_start, shouldn't it?

We could happily declare that OVMF can place option ROMs up to UmbStart
(== datalow_start) so when SeaBIOS relocates its own init code, the
extra memory (below the memory it uses for its own purposes) can be
reclaimed.

In fact I think my OVMF patch for the UmbStart,UmbEnd support already
did that, didn't it?

-- 
dwmw2

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