On 5 January 2015 at 11:19, Marc Zyngier [off-list ref] wrote:

On Mon, Jan 05 2015 at 10:08:18 am GMT, Peter Maydell [off-list ref] wrote:

quoted

On 5 January 2015 at 09:50, Marc Zyngier [off-list ref] wrote:

quoted

On 31/12/14 09:25, Peter Maydell wrote:

quoted

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