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From: "Sebastian Herbszt" <herbszt@gmx.de>
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Subject: Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios
Date: Sun, 22 Nov 2009 16:07:56 +0100
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To: Gleb Natapov <gleb@redhat.com>, Kevin O'Connor <kevin@koconnor.net>
Cc: qemu-devel@nongnu.org

Gleb Natapov wrote:
> 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.

I don't think keeping the segment writable after POST is a good idea.

- Sebastian