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/5.15/ and stored in ./meta-raspberrypi/recipes-kernel/linux/files - I have created a file linux-raspberrypi_%.bbappend in ./meta-raspberrypi/recipes-kernel/linux - I have created a .cfg file with CONFIG_PREEMPT_RT_FULL = y in ./meta-raspberrypi/recipes-kernel/linux/files - I have added both patch and cfg file in bbappend using SRC_URI:append:rpi.
I can observe the following: - patch and cfg files are available in ./build/tmp/work/raspberrypi4_64-agl-linux/linux-raspberrypi/1_5.15.34+gitAUTOINC+e1b976ee4f_0086da6acd-r0 - new folder linux-raspberrypi4_64-preempt-rt-build is available inside the folder above. But the problem seems to be that CONFIG_PREEMPT_RT = y is not applied to the .config file. So it seems the preempt-rt kernel is built but without the full preempt-rt support. - When I do bitbake linux-raspberrypi -c menuconfig I cannot select the full real time preempt kernel, only preemptible option available is --> Preemptible Kernel (Low-Latency Desktop). Fully Preemptible Kernel (Real-Time) is not available. - When I flash the image in the Rpi4 and run uname -r I see that the rt kernel has been built --> 5.15.34.rt56.v8 - but only with PREEMPT option but without RT when I do uname -v --> #1 SMP PREEMPT Tue Aug 9 21:20:00 UTC 2022 (without RT). I have tried building linux-yocto-rt for qemu and there I see that CONFIG_PREEMP_RT = y is available in the .config file. Also if I open menuconfig I have the option to select in General setup --> Preemption Model --> Fully Preemptible Kernel (Real-Time) If you can provide any hints on what am I missing it would be highly appreciated. Best Regards, Carles
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