[coreboot] suspend/resume in v3

Kevin O'Connor kevin at koconnor.net
Mon Sep 8 03:37:36 CEST 2008

On Mon, Sep 08, 2008 at 02:33:01AM +0200, Carl-Daniel Hailfinger wrote:
> On 08.09.2008 02:20, Kevin O'Connor wrote:
> > Using the space at 0xc8000 - 0xf0000 would work, but it would limit
> > the maximum number of option roms.
> That applies to any location between 0xA0000 and 0xFFFFF, though.

Option roms reside between 0xc0000 and 0xf0000.  The a and b segments
are used for something else - vga mmio I think.

> > (You can't use 0xc0000 for long
> > term storage, because the vga option rom must reside there.)
> Fortunately, the stack is designed to be discarded the moment we run a
> payload, so there are no survival requirements at all.

On resume though, the CAR area would overwrite the VGA rom that was
installed during the first boot.

Any memory that coreboot might clobber would need to be reserved, and
0xc0000 can't be reserved because vga option roms expect to be located

An alternative (as you mentioned in an early email) would be to save
and restore some area of memory below 1MB.


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