[yocto] [meta-raspberrypi] linux kernel rt

[Andreas Müller]

On Thu, Dec 14, 2017 at 11:40 AM, Mirza Krak <mirza.krak at gmail.com> wrote:

> 2017-12-14 9:41 GMT+01:00 Andreas Müller <schnitzeltony at gmail.com>:
> > On Thu, Dec 14, 2017 at 2:58 AM, Sherif Omran <sherifomran2000 at gmail.com
> >
> > wrote:
> >>
> >> hey guys,
> >>
> >> any body tried the real time kernel? I get an error, it is snot in the
> >> compatibility list.
> >> can we skip it?
> >>
> >> thanks
> >>
> >> --
> >
> > Good news: I use RT kernel only together with VC4 graphics and have lots
> of
> > fun on PI2/3.
> > Bad news: As far as I know it is not in meta-raspberrypi but in my fork
> [1].
> > There were attempts to land the RT-patches in meta-raspberrypi but that
> was
> > denied for huge patch size :(
>
> If the patch size was the only problem one can pull it by doing the
> following in the recipe:
>
> SRC_URI += " \
>     https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.9/
> patch-4.9.65-rt56.patch.gz;name=rt-patch
> \
> "
>
> SRC_URI[rt-patch.md5sum] = "9caa7b541d8c84c2d5c5f58985982e95"
> SRC_URI[rt-patch.sha256sum] =
> "47dfb518c78d8cbaafd4ab9130eb26fe0170be9189b580ab26209ef679309539"
>
> Note that above sums are "random" and not the for the actually file
> but are there for reference.
>
> That way you do not need to keep a copy of it in meta-raspberrypi.
>
> --
>
Hi Mirza,

Problem is that patches need alignments sometimes either caused by
Raspberry-Pi-specific adjustments or versions not matching exactly - RT
kernel patch updates are less frequent than kernel updates. Anyway: git is
very good at maintaining huge text content and this should not be a problem
these days. Another discussion about RT kernel was to have an extra kernel
for it and I never understood why. To me that seems nothing but an extra
maintenance burden.

However - just wrote to Paul: I plan to be at FOSDEM and we can discuss
there how to get back to one layer only (not mine!) making everybody happy
:)

Andreas
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