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From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] OVMF with q35 (was: osx bootloader)
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To: BALATON Zoltan <balaton@eik.bme.hu>
Cc: "Gabriel L. Somlo" <gsomlo@gmail.com>, Alexander Graf <agraf@suse.de>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On Sa, 2014-02-01 at 15:35 +0100, BALATON Zoltan wrote:
> On Sat, 1 Feb 2014, Alexander Graf wrote:
> > The assert happens inside the guest, so I'm afraid you'll have to add 
> > debugging output to edk2. Just print out the port number if port & 3 in 
> > the code path above.
> 
> I've come this same conclusion too after I managed to enable qemu iport 
> debugging but it wasn't helpful.

IIRC it is ovmf trying to access the piix4 pm timer, even when running
on q35.

cheers,
  Gerd