Re: [PATCH 0/9] ARM Versatile multi-platform support

Peter Maydell
2015-01-05T17:41:05Z

On 5 January 2015 at 11:19, Marc Zyngier <marc.zyngier-5wv7dgnIgG8@public.gmane.org> wrote:
> On Mon, Jan 05 2015 at 10:08:18 am GMT, Peter Maydell <peter.maydell-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> wrote:
>> On 5 January 2015 at 09:50, Marc Zyngier <marc.zyngier-5wv7dgnIgG8@public.gmane.org> wrote:
>>> On 31/12/14 09:25, Peter Maydell wrote:
>>>> Will Deacon and Marc Zyngier are currently in possession of that h/w.
>>>> I'm sure they'd be delighted to pull it out of the cupboard and
>>>> give it a spin :-)
>>>
>>> I'll try to find some time (or a victim to do the testing... ;-)
>>
>> To save you some time in trying to debug things which didn't work
>> before this patchset, the status last time I tested on h/w was:
>> * PCI MMIO accesses work
>> * PCI IO accesses work
>> * PCI bus-master (DMA) doesn't work
>>
>> with the failure symptom for DMA being that the card wrote to
>> the correct area of memory but only every other word, so you
>> got strings like "HellXXXXrld" with the Xs being garbage.
>> This feels to me like a h/w issue rather than a driver problem.
>
> Looks like some 64bit address decoding getting in the way. Or
> something.... Do you remember the exact platform you tried this on (I
> have PB926, PB1176, and a bunch of RealViews with an odd mix of
> tiles...)?

According to my coverletter email from the last time I did anything
with versatile PCI:
http://lists.infradead.org/pipermail/linux-arm-kernel/2013-August/193990.html
it was a PB926 (and an rtl8139 network card). I'm pretty sure I
flashed the board with the latest IO FPGA image too.

thanks
-- PMM