[Xenomai] ODROID-U3 porting problems

Poole Jr, Donald R. donald.poole at swri.org
Thu Aug 28 17:12:27 CEST 2014


On 8/28/14, 8:51 AM, "Gilles Chanteperdrix"
<gilles.chanteperdrix at xenomai.org> wrote:

>On 08/28/2014 03:45 PM, GP Orcullo wrote:
>> On Wed, Aug 27, 2014 at 11:45 PM, Gilles Chanteperdrix
>>> So, this is a cortex a9. On Cortex a9, Xenomai tries to use the global
>>> timer for tsc emulation. Are you sure this processor has a global
>>>timer?
>>> Again, running the "tsc" program will help you see if the tsc emulation
>>> is working correctly.
>> 
>> AFAIK, the exynos soc doesn't use twd - they have a multi-core timer
>> instead. There is one global timer and a local timer for each core.
>> 
>> BTW, is it necessary that there should be an ipipe timer for each core
>> or a single
>> "global" one will do?
>
>The global timer is not the same thing as the twd, and I was talking
>about using the global timer as a clock source (for tsc emulation), not
>as a timer, the advantage being that you would have a much better
>resolution. Xenomai indeed requires local timer support (for which it
>uses twd on cortex a9), that is one timer per core.
>
>-- 
>                                                                Gilles.
>
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Gemi - Is your work on patching the Odroid-U3 kernel available on github
or elsewhere?  I would really like to have my U3 running Xenomai in this
manner as well.  I¹ve been working to achieve the same thing, but I
appears that you have made far better progress.

-Donald





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