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

From: Sebastian Herbszt
Subject: Re: [Qemu-devel] Re: POST failure (loop) with isapc and seabios
Date: Sun, 22 Nov 2009 16:07:56 +0100

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

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