Re: [Xenomai] iMX6 support

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On 05/23/2012 12:14 PM, Thierry Bultel wrote:
> Le 23/05/2012 12:05, Gilles Chanteperdrix a écrit :
>> On 05/23/2012 11:56 AM, Thierry Bultel wrote:
>>> Hi,
>>>
>>> We are looking in a replacement solution for our obsolete
>>> pentium-Celeron calculator.
>>> For many reasons, we would like to switch to the ARM architecture.
>>> The aimed CPU is the iMX6 Quadcore.
>>>
>>> Freescale provides a patched 2.6.35 and 2.6.38 kernel that do not have
>>> all the peripherals (the CAN seems to be missing)
>>> and Emtrion, a CPU module manufacturer, say they provide the additional
>>> patches to have the complete BSP.
>>> It is likely a 2.6.35 only, though.
>> Xenomai for mx6q does not exist for linux 2.6.35. It only exists for
>> freescale branch for 2.6.38, or 3.0, as a separate set of patches to
>> apply before and after the Adeos patches for the vanilla kernel. For
>> further details, see ksrc/arch/arm/patches/README in xenomai 2.6 sources.
> Thanks, yes, as I said, I am aware that the very first work for me will 
> be to get
> the non-xenomai 2.6.38 kernel fully working
>> Furthermore, we have some stability issues with Xenomai for mx6q with
>> 3.0, the issues looking a lot like an issue with cache. We would ned to
>> recheck 2.6.38 to see if it had the same issues, but I would bet it does.
>>
> Actually my concern was to know if there were currently developments
> on that CPU. The fact that they are remaining bugs is not a concern,
> as long as they would be likely be corrected in the coming months.
> Do these bugs also exist on the mx6 single core ?

I was unable to reproduce the cache issue on single core, but I have not
tested enough to be absolutely sure that we do not have it. The issue is
sufficiently rare that it may go unnoticed during one test, and appear
during the next.

-- 
					    Gilles.