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Date: Sun, 22 Nov 2009 14:35:03 +0200
From: Gleb Natapov <gleb@redhat.com>
Subject: Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios
Message-ID: <20091122123503.GH3193@redhat.com>
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To: Kevin O'Connor <kevin@koconnor.net>
Cc: qemu-devel@nongnu.org, Sebastian Herbszt <herbszt@gmx.de>

On Fri, Nov 20, 2009 at 05:51:13PM -0500, Kevin O'Connor wrote:
> On Thu, Nov 19, 2009 at 10:30:20PM +0100, Sebastian Herbszt wrote:
> > i386-softmmu/qemu -M isapc -bios pc-bios/bios.bin
> 
> Thanks for reporting this.
> 
> After compiling seabios with CONFIG_DEBUG_SERIAL set in src/config.h
> and running:
> 
> qemu -M isapc -serial file:foo
> 
> I see:
> 
> Unable to unlock ram - bridge not found
> 
> SeaBIOS stores global variables in the f-segment.  This greatly
> simplifies the code, but it does require the ability to write to the
> f-segment.  Since the f-segment can't be unlocked in "isapc" mode, the
> boot fails.
> 
> I'm not really sure what to do about this.  Maybe some kind of non-pci
> method of unlocking the f-segment could be implemented.
> 
> Anthony, what do you think?
> 
May be make qemu to map it writable if isapc is specified.

--
			Gleb.