meta-raspberrypi kernel comes from
https://github.com/raspberrypi/linux and they stopped providing -rt
options some time ago.

Your options are to apply the -rt patchset to regular rpi kernel and
enable needed options via custom .bbappend, or take linux-yocto-rt and
see how far you get.

Alex

On Mon, 23 Jan 2023 at 10:57, Carles Sole via lists.yoctoproject.org
<Carles.SoleMendi=de.bosch.com@...> wrote:

Hello all,

I would like to understand if it is still possible to build an image for raspberrypi4-64 where the preempt-rt patch is applied to the kernel, e.g. by adding "PREFERRED_PROVIDER_virtual/kernel" to local.conf.

I could see that in older branches of [meta-raspberrypi] there was a specific recipe for the preempt-rt patch, e.g. linux-raspberrypi-rt_4.19.bb. This recipe was using the specific raspberrypi branch rpi-4.19.y-rt.

I see that in newer branches this rt branch disappeared but I was not able to understand the history and what is the current method to implement this patch, assuming is still supported.

Any hints on how to do this would be much appreciated.

Best Regards,
Carles