Re: [Xenomai] Building xenomai with latest buildroot snapshot.

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

On 01/22/2013 01:09 AM, bifferos wrote:

> 
> 
> ----- Original Message -----
> 
>> From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
>>
>> On 01/21/2013 10:36 PM, bifferos wrote:
>>>
>>>  I was able to compile Xenomai under buildroot 2011.11 without too much 
>> trouble, however I'm now trying 
>>>
>>>  to do the same with the latest buildroot snapshot.  Unfortunately it seems 
>> buildroot no longer has an
>>>  easy option to select a kernel compatible with Xenomai.  I looked in 
>> xenomai-2.6.1/ksrc/arch/x86/patches
>>>
>>>  and there are three of them
>>>
>>>  adeos-ipipe-2.6.37.6-x86-2.9-02.patch
>>>  adeos-ipipe-2.6.38.8-x86-2.11-01.patch
>>>  ipipe-core-3.2.21-x86-1.patch
>>>
>>>
>>>  Can someone please explain what this ipipe-core thing is?
>>
>>
>> I am desperately looking for a mail from Philippe where he explained it,
>> but can not find it back. Maybe he can give some explanations.
>>
>>>  Are these interchangeable (they are similar
>>
>>>  sizes)? 
>>
>> Yes.
> 
> OK, thanks, I will give 3.2.21 a go then.
> 
>>
>>>  Do I have to stick to 2.6.37.6 kernel to stand any chance of getting this 
>> working?
>>
>>
>> The newer versions should work, though I would recommend to wait for the
>> next release which should happen in the next few days.
>>
>> Also note that I guess you are using Xenomai on the bifferboard, since I
>> also guess the processor on this board does not have a tsc, it will be
>> emulated using the PIT, which is slow, so, unless you can provide
>> another hardware timer with a lower latency, which will work starting
>> with the I-pipe core for Linux 3.4, you should turn off
>> CONFIG_XENO_OPT_STATS to improve latencies.
> 
> Thanks for the tip, actually I am trying to simply compile an ISO image to run under VirtualBox
> at the moment, so latencies are way down on my list.  My notes are here:
> https://sites.google.com/site/bifferboard/Home/boards-with-1mb-flash/buildroot/xenomai
> 
> It all seems like a bit of a hack, so my next task is to try to create a buildroot package to 
> allow choosing the trivial-periodic demo and installing it from the Buildroot config menu.


There are other tests in Xenomai testsuite you may want to try before
trivial-periodic.

-- 
                                                                Gilles.