[Xenomai] Raspberry Pi - 3.10.34

Gregory Dymarek gregd72002 at gmail.com
Fri Mar 28 15:22:38 CET 2014

Ok, I think I'm on top of it. Will post all the patches once I test
them properly.

Another question on the topic of PRE and POST patches. Is there a
reason why prepare-kernel.sh cannot invoke PRE and POST patches

I'm trying to get this into a buildroot and it does not support pre
and post patches. Also, I'm getting a push back on adding the support
for pre- and post- ipipe patches into buildroot.

On 27 March 2014 18:37, Gilles Chanteperdrix
<gilles.chanteperdrix at xenomai.org> wrote:
> On 03/27/2014 04:33 PM, Lowell Gilbert wrote:
>> Gregory Dymarek <gregd72002 at gmail.com> writes:
>>> To get kernel 3.10.34 to work the ipipe patch needs updating.
>>> (ipipe-3.8.x does not apply cleanly).
>>> What is the process to release a new ipipe patch for 3.10.34?
>>> Or what is the alternative?
>> The source control trees are easily available, so there are a lot of
>> options.
>> I did a "git merge" to bring the ipipe-3.10 branch into my 3.10 kernel
>> branch. If I didn't have a lot of my own (evolving) hardware to deal
>> with, I might not have needed to merge at all, so the ipipe-3.10 branch
>> itself might be good enough for some people.
>> Producing the patch may be as simple as a simple "git diff" operation.
> It is a bit more complicated than that:
> - git diff will produce a huge patch with all the architectures in, for this
> reason, there is a script in the I-pipe git to output only the changes for
> arm, scripts/ipipe/genpatches.sh
> - if you want your patch to be distributed with Xenomai, we do not take a
> complete patch for the forked kernel, which would duplicate a lot of the
> contents of the vanilla patch, and lead to a maintenance nightmare every
> time we want to update the generic parts of the patch.
> So, we use -pre and -post patches, which contain only the changes necessary
> for the forked kernel. The -pre patch is applied on the forked kernel
> sources so that the mainline patch applies, then the -post patch is applied
> after to revert the changes made by the -pre patch, and add the changes
> specific to the forked kernel.
> In order to generate a -pre and -post patch. Start by merging the ipipe-3.10
> branch with your forked kernel, as Gilbert says. This will be your reference
> branch.
> Create a branch which contains only the forked kernel. Try and apply the
> mainline patch in "dry-run" mode. Reset every file which causes a conflict
> with the patch to the contents of the mainline kernel. The difference
> between the result of this operation and the forked kernel is the -pre
> patch.
> Apply the mainline patch, which should apply without conflicts.
> The difference between the reference branch and the result of this operation
> is the -post patch.
> You can then verify that starting from the forked kernel, and applying, in
> this order, the -pre, the mainline, and the -post patches leads to the same
> result as your reference branch.
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> --
>                                             Gilles.

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