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From: "Sebastian Herbszt" <herbszt@gmx.de>
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Date: Sat, 21 Nov 2009 15:37:30 +0100
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Subject: [Qemu-devel] Re: POST failure (loop) with isapc and seabios
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To: Kevin O'Connor <kevin@koconnor.net>, Anthony Liguori <anthony@codemonkey.ws>
Cc: qemu-devel@nongnu.org

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.

Could try to emulate the Intel 82359 DRAM Controller in qemu or keep
using the Bochs BIOS for isapc.

- Sebastian