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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Mon, 15 Jun 2015 12:18:16 +0200
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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: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Marcel Apfelbaum <marcel@redhat.com>, lersek@redhat.com, Kevin O'Connor <kevin@koconnor.net>, seabios@seabios.org, qemu-devel@nongnu.org

  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