Category: Installing LinuxCNC
Its quite tricky building a custom kernel for preempt_rt. What we have done here is look at the kernel version the RT patch was released on at kernel.org, then we have to find the actual commit in the Rpi kernel git that matches the same release. If the kernel version deviates from the RT patch, the kernel will fail. So we end up with a kernel in between released versions of Debian. We also need to be ahead of the released kernels to maximize support for the Pi 5 which was released just after Linuxcnc 2.9.1 was released. Rpi are also making it hard for us since the Pi 5 because they are no longer tracking each version of the Linux kernel so sometimes, we can't upgrade to a later RT patch.
So you have to wait for Linuxcnc to release new images for a reason. Don't try and upgrade yourself without forking thr Linuxcnc builder and compiling from source
