To handle application in the Linux userspace in hard realtime the current LINUX kernel 4.9.88 must be patched.
This is because LINUX does not include all realtime patches from the PREEMT RT version (which is the preferred realtime implementation from LINUX Kernel developers). Newer kernel will less differ from a fully PREEMPT RT kernel version.
So, how do we have to patch the Kernel from the efusA9X release to gain full realtime support?
Detailed information about PREEMPT RT can be found in the presentation here:
To patch the kernel we can simple follow one of the tutorials online (see [1]).
But for the kernel version 4.9.88 we can not find a matching rt patch. But a older one is working nice for this issue, see [2].
This will patch the kernel ready for compilation, but it is recommended to adjust the realtime priorities, see [3] for this. Otherwise a realtime application can sporadically block your system.
I also attached both patches for every one how wants to use it.
[1]:
https://stackoverflow.com/ques…rt-linux-patch-for-ubuntu
[2]:
https://mirrors.edge.kernel.or…atch-4.9.84-rt62.patch.gz
[3]:
I added now the real time patch (preempt) version rt68 to the kernel version 5.15.131 from the F+S release fsimx6sx-B2024.01.
@F+S: If you are interested I can create a pull request (maybe a RT branch) to distribute it over your github organisation.
@all others: If F+S do not plan to host the changes you can contact me for the patched kernel.
Best regards.
Hello,
yes please create a pull request we will have a look at it.
Thank you very much.
Your F&S Support Team
