<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Thu, Dec 14, 2017 at 11:40 AM, Mirza Krak <span dir="ltr"><<a href="mailto:mirza.krak@gmail.com" target="_blank">mirza.krak@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span class="gmail-">2017-12-14 9:41 GMT+01:00 Andreas Müller <<a href="mailto:schnitzeltony@gmail.com">schnitzeltony@gmail.com</a>>:<br>
> On Thu, Dec 14, 2017 at 2:58 AM, Sherif Omran <<a href="mailto:sherifomran2000@gmail.com">sherifomran2000@gmail.com</a>><br>
> wrote:<br>
>><br>
>> hey guys,<br>
>><br>
>> any body tried the real time kernel? I get an error, it is snot in the<br>
>> compatibility list.<br>
>> can we skip it?<br>
>><br>
>> thanks<br>
>><br>
>> --<br>
><br>
> Good news: I use RT kernel only together with VC4 graphics and have lots of<br>
> fun on PI2/3.<br>
> Bad news: As far as I know it is not in meta-raspberrypi but in my fork [1].<br>
> There were attempts to land the RT-patches in meta-raspberrypi but that was<br>
> denied for huge patch size :(<br>
<br>
</span>If the patch size was the only problem one can pull it by doing the<br>
following in the recipe:<br>
<br>
SRC_URI += " \<br>
  <a href="https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.9/patch-4.9.65-rt56.patch.gz;name=rt-patch" rel="noreferrer" target="_blank">https://cdn.kernel.org/pub/<wbr>linux/kernel/projects/rt/4.9/<wbr>patch-4.9.65-rt56.patch.gz;<wbr>name=rt-patch</a><br>
\<br>
"<br>
<br>
SRC_URI[rt-patch.md5sum] = "<wbr>9caa7b541d8c84c2d5c5f58985982e<wbr>95"<br>
SRC_URI[rt-patch.sha256sum] =<br>
"<wbr>47dfb518c78d8cbaafd4ab9130eb26<wbr>fe0170be9189b580ab26209ef67930<wbr>9539"<br>
<br>
Note that above sums are "random" and not the for the actually file<br>
but are there for reference.<br>
<br>
That way you do not need to keep a copy of it in meta-raspberrypi.<br>
<span class="gmail-HOEnZb"><font color="#888888"><br>
--</font></span><br></blockquote><div>Hi Mirza,<br></div><div>Â </div></div>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.<br></div><div class="gmail_extra"><br></div><div class="gmail_extra">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 :)<br></div><div class="gmail_extra"><br></div><div class="gmail_extra">Andreas<br></div></div>