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Date: Mon, 15 Jun 2015 12:26:36 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH V2] pci: fixes to allow booting from extra
 root pci buses.
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To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Marcel Apfelbaum <marcel@redhat.com>, lersek@redhat.com, Kevin O'Connor <kevin@koconnor.net>, seabios@seabios.org, qemu-devel@nongnu.org

On Mon, Jun 15, 2015 at 12:18:16PM +0200, Gerd Hoffmann wrote:
>   Hi,
> 
> > > I'm wondering whenever things become easier if we add config registers
> > > to the pxb, where the firmware can program the bus number range and we
> > > can use the config register base as a way to specify which pxb we are
> > > referring to ?
> 
> > But then we'll need a bunch of fw cfg entries to let guest
> > discover the extra roots and their bus ranges.
> 
> We could add them to the pxb host bridge device (1b36:0009).  Then we
> don't need any fw_cfg stuff, seabios could simply lookup/setup things in
> the 1b36:0009 pci config space ...
> 
> cheers,
>   Gerd

Sure but then it's not a fixed address so you can't use these to name
boot devices.

-- 
MST