Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios

[Kevin O'Connor]

On Sun, Nov 22, 2009 at 05:10:53PM +0200, Gleb Natapov wrote:
> On Sun, Nov 22, 2009 at 04:07:56PM +0100, Sebastian Herbszt wrote:
> > Gleb Natapov wrote:
> > >May be make qemu to map it writable if isapc is specified.
> > 
> > I don't think keeping the segment writable after POST is a good idea.
> > 
> Isn't it writable now after POST with pcipc? Why this is not a good
> idea?

SeaBIOS and bochs bios will make the f-segment readonly at the end of
post.  See make_bios_readonly() in src/shadow.c.

SeaBIOS' ram locking requires the same pci access that the unlocking
needs, so if qemu made the f-segment writable on isa then it would
remain writable past POST.

-Kevin