[Buildroot] Xenomai 3.0.1?

[Arnout Vandecappelle <arnout@mind.be>]

On 29-01-16 09:36, Thomas Petazzoni wrote:
> Hello Jerry,
> 
> On Thu, 28 Jan 2016 17:09:33 -0000, jerry at chordia.co.uk wrote:
>> Running the xenomai prepare-kernel script against an externally sourced
>> 3.18.26 kernel. Buildroot builds a bootable kernel and working FS but the
>> Xenomai userland tools appear to be related to 2.X. 
>>
>> How do I best get BR to install the latest stuff?
> 
> You need to adapt the Xenomai package in package/xenomai/ and also
> probably the Xenomai Linux extension logic in
> linux/linux-ext-xenomai.mk.
> 
> Note however that there is a *big* difference between Xenomai 2 and
> Xenomai 3, and therefore this update is certainly not the easiest
> Buildroot modification that you can imagine. Xenomai 3 can run on top
> of PREEMPT_RT kernels, without the Xenomai co-kernel and Adeos
> interrupt pipeline. This probably requires some fairly significant
> changes in the Xenomai packaging.
> 
> In addition, since Xenomai 3 is rather new and so different from
> Xenomai 2, we probably want to keep support for Xenomai 2 for a while,
> which adds even more challenge to the task.

 Begging to differ here. As far as I know, API-wise, Xenomai 3 is compatible
with Xenomai 2 (except maybe a few deprecated functions that have been removed).
For sure, nothing internal in Buildroot depends on it.

 In addition, running on top of PREEMPT_RT is optional.

 Therefore, I think the bump can be done in the "simple" way first, that there
is no need to offer a Xenomai 2 version, and that a new feature of offering the
single-kernel implementation can be added later.

 Regards,
 Arnout


> 
> In fact, I didn't notice that Xenomai 3 was officially released, last
> time I looked they were at the 3.0-rc stage, so I didn't bother doing
> the Buildroot packaging. I might have a look some day, but that's
> pretty far away on my TODO list, so if someone else wants to look at
> it, it would definitely be great!
> 
> Best regards,
> 
> Thomas
> 


-- 
Arnout Vandecappelle                          arnout at mind be
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