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

From: Kevin O'Connor
Subject: Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios
Date: Sun, 22 Nov 2009 10:38:42 -0500
User-agent: Mutt/1.5.19 (2009-01-05)

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.


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