[yocto] Current state of linux-raspberrypi-rt?

[Andreas Müller]

On Mon, Jun 26, 2017 at 7:19 AM, Trevor Woerner <twoerner at gmail.com> wrote:
> On Sun, Jun 25, 2017 at 10:32 PM, Paul D. DeRocco
> <pderocco at ix.netcom.com> wrote:
>> Google turns up a lot of stuff about this, but the latest I found was a
>> thread from 1/5/17 that started with Trevor Woerner posting a 1MB patch,
>> and that ended with him posting a message saying that it didn't actually
>> work.
>
> I posted a v1, which worked great, and continues to work great.
>
> After posting the v1, lots of feedback was given. One of those pieces
> of feedback was that I shouldn't include the entire defconfig, but
> rather I should use some sort of "savedconfig" setting to generate the
> full config. I had never heard of this before. I asked for more
> clarification but received none. I went ahead with the v2 using this
> "savedconfig" technique. It *appeared* to work (which is why I
> submitted the update to the mailing list), but, after a lot of
> testing, I discovered that this "savedconfig" thing didn't work. The
> defconfig that was generated using this technique was useless and
> nobody could provide any reason why or advice how to fix it.
>
> So v2 didn't work, but v1 did and still does (we're using it internally).
>
> But everyone considered v1 to not be acceptable for inclusion for a
> number of reasons, so it never got merged. Besides, that work was for
> a 4.4 kernel, which is now considered "old".
>
>> Is there anything new on this? I'm trying to do some compute-intensive
>> audio on an RPi3, and it really needs a real-time kernel.
>
> Andreas Müller has a meta-raspberrypi fork in which he has an -rt
> recipe for a 4.9 kernel:
> https://github.com/schnitzeltony/meta-raspi-light
Yes - I run music sequencer/synthesizer stuff on top of jack on
RPi2/3. So I use RT-kernel by default and am really happy with it.

Andreas