Can anyone help test Cortex A9 patches?

[Rajanikanth H.V]

Russell,

Patch to fix "DMA Cache Coherency issue on A9-SMP" is working,
Since i am using 2.6.29 version of kernel, i manually patched the
files which are
relevant to our SOC.

Thanks a lot.

Regards,
Rajanikanth

On Thu, Nov 19, 2009 at 11:03 PM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Thu, Nov 19, 2009 at 05:24:46PM +0000, Catalin Marinas wrote:
>> On Thu, 2009-11-19 at 09:03 +0000, Russell King - ARM Linux wrote:
>> > I need help testing Cortex A9 patches.  What I need is someone with a
>> > fairly fully fledged Cortex A9 platform with the ability to build and
>> > test recent kernels - and therefore be able to test my patches without
>> > modification.
>> >
>> > Specifically, I'm looking for someone who can reproduce data corruption
>> > on DMA transfers from devices caused by Cortex A9's speculative prefetching
>> >
>> > Unfortunately, I have no way to reproduce this problem here (I have no
>> > Cortex A9 hardware), and as such I can't test the fixes.
>>
>> I can get access to a PBX-A9 board but there is no DMA support on it, so
>> not able to reproduce the problem.
>>
>> What's the background to this? Has anyone reported issues?
>
> Well, I had a fast response from people this morning, and the patch has
> been successfully tested against a recent kernel.  So problem mostly
> solved.
>
> Essentially corruption caused by speculative prefetches from buffers while
> they are mapped for DMA.  You were sent an email late last month about
> the problem:
>
> http://lists.arm.linux.org.uk/lurker/message/20091031.131319.18796aa1.en.html
>
> Unfortunately, the reporter seems to have taken the subsequent messages
> off the list.  Morevoer, the original reporter said the patch didn't help,
> however since he applied it to an older kernel and got rejects, I'm going
> to dismiss that.  I can find nothing wrong with my patch which would mean
> his original problem would not be fixed.
>
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