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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: Thu, 26 Nov 2009 02:48:46 -0500
User-agent: Mutt/1.5.19 (2009-01-05)

On Thu, Nov 26, 2009 at 09:20:34AM +0200, Gleb Natapov wrote:
> On Thu, Nov 26, 2009 at 02:15:27AM -0500, Kevin O'Connor wrote:
> > Now, if the bios is reloaded, the jump to the resume vector will skip
> > ide, bios table, and other internal state setup.  So, later calls to
> > the bios will likely fail.
> > 
> Seabios stores .bss and .data section in BIOS segments?


>If this is the
> case that you are right. Can we move them somewhere else and add it to
> e820 map?

That would significantly complicate the code, and it wouldn't truly
solve the issue as some data needs to be stored in the f-segment (eg,
smbios anchor).

>Although event then switching to real mode using triple fault
> after migration to newer BIOS will not work properly.

IMO, migrating to a new bios doesn't make sense - the bios is an
application with state - one can't just replace the code.


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