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Date: Sun, 2 Feb 2014 03:18:42 +0100 (CET)
From: BALATON Zoltan <balaton@eik.bme.hu>
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Subject: Re: [Qemu-devel] osx bootloader
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Gabriel L. Somlo" <gsomlo@gmail.com>, Alexander Graf <agraf@suse.de>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On Sat, 1 Feb 2014, Paolo Bonzini wrote:
> The firmware has to be ported to each new chipset.
>
> OVMF was never ported to anything but PIIX.

Looks like this is the case. Now I can see that 
OvmfPkg/Library/PlatformBdsLib/BdsPlatform.c has hardcoded pci paths in it 
corresponding to the pc machine type with PIIX and it tries to access 
these devices unconditionally even if they do not exist (as on q35 
machine). So this obviously won't work. I think I give up at this point 
because I don't know enough about Q35 and I don't see how could it be 
hacked into Ovmf. Additionally it seems that this alone would not be 
enough to use Apple's boot.efi verbatim but something more complex, very 
much resembling Clover would be needed to boot OS X with Ovmf EFI which is 
not much cleaner solution than using Chameleon with Seabios that already 
works now.

Regards,
BALATON Zoltan