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[Qemu-devel] Re: SeaBIOS cdrom regression with Vista

From: Kevin O'Connor
Subject: [Qemu-devel] Re: SeaBIOS cdrom regression with Vista
Date: Fri, 20 Nov 2009 17:36:44 -0500
User-agent: Mutt/1.5.19 (2009-01-05)

On Fri, Nov 20, 2009 at 02:08:03PM -0500, Kevin O'Connor wrote:
> On Fri, Nov 20, 2009 at 01:03:51PM -0500, Kevin O'Connor wrote:
> > I've looked into this, and it looks like the cdrom is left in an odd
> > state.  At this point, I think SeaBIOS is tickling a bug outside of
> > seabios (eg, in Vista or qemu).  I would appreciate it someone with
> > cdrom knowledge of qemu could help.
> [...]
> > SeaBIOS has a different ata drive detection mechanism than bochs - it
> > needs it in order to work on real hardware.  So, this explains why
> > bochs bios doesn't show this issue.  (Seabios tries to send an
> > "identify packet device" and then an "identify device" command to
> > detect a drive; bochs bios looks for a signature in the ata registers
> > after an ata reset.)
> It looks like I spoke too soon.  It appears the SeaBIOS init can leave
> the ATA controller in an interrupts disabled state.  This appears to
> confuse Vista.  So, this is a SeaBIOS bug - I'll implement a fix.

I've committed a fix to SeaBIOS - commit 42bc3940.


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