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

["Sebastian Herbszt" <herbszt@gmx.de>]

Kevin O'Connor wrote:
> On Wed, Nov 25, 2009 at 02:20:39PM +0200, Gleb Natapov wrote:
>> On Wed, Nov 25, 2009 at 06:09:51AM +0000, Jamie Lokier wrote:
>> > But the BIOS must be reloaded from ROM, I'm guessing, if the keyboard
>> > controller method is used and the word asking for a branch back to the
>> > application has not been set.  Because that's how a modern OS (if not
>> > using ACPI) asks for a system reset.
>> > 
>> > Do you think the above is (a) correct, and (b) what's implemented?
>> > 
>> Do different things during reset depending on CMOS values doesn't sound
>> right to me. I don't know what is implemented right now. I thought that
>> we reload BIOS on reset.
> 
> We could have qemu do a soft reset (not reload rom) on a triple fault
> or keyboard controller reset, and then have SeaBIOS request a hard
> reset (have qemu reload rom) if it detects a soft reset that is not a
> "resume" request.
> 
> I'm also not sure what qemu does today.

I don't think such an interface would add a long time benefit and would prefer
a proper solution which will not tie seabios even more to qemu. One day it might
be possible to run a commercial BIOS on qemu, just like it is possible on Bochs.
Adding this interface might prevent that.

- Sebastian