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From: Laszlo Ersek <lersek@redhat.com>
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Date: Mon, 18 Jan 2016 19:16:21 +0100
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Subject: Re: [Qemu-devel] [PATCH] hw/pci: ensure that only PCI/PCIe bridges
 can be attached to pxb/pxb-pcie devices
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To: Peter Maydell <peter.maydell@linaro.org>, Marcel Apfelbaum <marcel@redhat.com>
Cc: QEMU Developers <qemu-devel@nongnu.org>, "Michael S. Tsirkin" <mst@redhat.com>

On 01/18/16 19:08, Peter Maydell wrote:
> On 18 January 2016 at 15:27, Marcel Apfelbaum <marcel@redhat.com> wrote:
>> PCI devices can't be plugged directly into PCI extra root bridges
>> because their resources can't be computed by firmware before the ACPI
>> tables are loaded.
>>
>> Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
>> ---
>>
>> Hi,
>>
>> This patch follows the discussion:
>> https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg01484.html
> 
> Is it definitely the case that no current working command lines plug
> PCI devices directly into these things (including on platforms that
> don't have anything to do with ACPI at all) ?

No clue about "pxb-pcie", but re: "pxb", the documentation and examples
by Marcel (see: "docs/pci_expander_bridge.txt") will certainly continue
working, with this patch place. And, that text file is authoritative for
pxb, since Marcel (et al) wrote the code directly for the purposes
described in the txt.

(But I'll let Marcel answer too! :))

Thanks
Laszlo