Hello all, in case it helps someone else I found the dependency that was avoiding the RT patch to be applied to raspberrypi4-64 build. In bcm2711_defconfig for arm64 KVM is enabled. If KVM is disabled

#raspberrypi

Hi Joel, thanks for creating the issue. Does the solution from Aleksandr work for you with raspberrypi4-64? The funny thing is for me it doesn't. As I mentioned above if I use his solution: for MACHIN

#raspberrypi

I created an issue: https://github.com/agherzan/meta-raspberrypi/issues/1147 I would use Kuzemko Aleksandr's solution in bbappend until there is support in meta-raspberrypi.

#raspberrypi

Hi, You should open issue with the upstream layer referencing this dialog: https://github.com/agherzan/meta-raspberrypi Joel On Thu, Feb 2, 2023, 11:18 PM Carles Sole via lists.yoctoproject.org <Carle

#raspberrypi

Hello Joel, I do get the same, but my understanding is that the RT features are not enabled. I would expect to get: Linux raspberrypi4-64 5.15.34-v8 #1 SMP PREEMPT RT Tue Apr 19 19:21:26 UTC 2022 aarc

#raspberrypi

In the case of kirkstone, this is what I get using `LINUX_KERNEL_TYPE = "preempt-rt"`: Linux raspberrypi4-64 5.15.34-v8 #1 SMP PREEMPT Tue Apr 19 19:21:26 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux I'

#raspberrypi

Hello Joel, thanks for your reply. I was not aware about this possibility. I have tried it and the preemptive rt kernel is built instead of standard ("linux-raspberrypi4_64-preempt-rt-build" is availa

#raspberrypi

In kirkstone for example, you build preempt-rt variant by adding to local.conf: LINUX_KERNEL_TYPE = "preempt-rt" Does this no longer work?

#raspberrypi

Hello Lukasz, Aleksandr, I have not managed to build it for Rpi4-64. I followed the same approach as Aleksandr but it does not work for 64bit system. Doing exactly the same changes as Aleksandr if I b

#raspberrypi

My results: (32bit CM4 system) uname -a Linux b2qt-raspberrypi4 5.15.56-rt56-v7l #1 SMP PREEMPT_RT Fri Jul 22 13:23:23 UTC 2022 armv7l GNU/Linux I create linux-raspberrypi_5.15.bbappend and add SRC_UR

#raspberrypi

Hi Carles Have you managed to go any further with your investigation regarding PREEMPT-RT on RPi4-64? Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Erika Unter HR

#raspberrypi

Hi Alex, Andrei, thanks for your reply. Based on your feedback I've tried the following: - I have downloaded the patch patch-5.15.86-rt56.patch from https://cdn.kernel.org/pub/linux/kernel/projects/rt

#raspberrypi

That would be correct. There is no support out of the box in the BSP layer and I am not aware of any layers providing that. If we find a person who wants to maintain a fork with the RT patches, I'm ha

#raspberrypi

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 enabl

#raspberrypi

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/kern

#raspberrypi

In this case I have no idea unfortunately. Does a regular kernel work? Alex

#dunfell #patch #yocto #raspberrypi #linux

Hello Alex, Sorry for late reply. Actually i madert- image by setting the preferred virtual/kernel type. PREFERRED_PROVIDER_virtual/kernel = "linux-raspberrypi-rt" and bake the recipe for following ta

#dunfell #patch #yocto #raspberrypi #linux

It is not possible to say what went wrong if I cannot see the changes you did, what commands you type, and what is the outcome (vs. what you expect). So you need to publish your code somewhere, and de

#dunfell #patch #yocto #raspberrypi #linux

Hello Alex Because i had cloned linux-yocto for 4.12 as stated in (https://docs.yoctoproject.org/3.1.20/kernel-dev/kernel-dev-common.html#using-traditional-kernel-development-to-patch-the-kernel) but

#dunfell #patch #yocto #raspberrypi #linux

There is a version mismatch. If you want to patch the 5.4 kernel, why is the bbappend for 4.12? Alex

#dunfell #patch #yocto #raspberrypi #linux