Installing a Real-time Kernel to the ComfilePi

Beginning with the Bookworm OS, it is now possible to easily install a real-time kernel to a ComfilePi panel PC. Simply follow the following procedure:

  1. Run sudo apt update followed by sudo apt full-upgrade to ensure you've updated your software packages to the latest releases.
  2. Reboot to ensure everything is still operating as expected.
  3. Run sudo apt install linux-image-rpi-v8-rt to install the real-time kernel package.
  4. Add the lines kernel=kernel8_rt.img and arm_64bit=1 to the /boot/firmware/config.txt file.
  5. Reboot
  6. Upon rebooting run uname -a and ensure it outputs “PREEMPT_RT”. If it does, the ComfilePi panel PC is running the real-time kernel.

To switch back to the ordinary kernel, simply comment out the kernel=kernel8_rt.img line in the /boot/firmware/config.txt file.

To better utilize the features of the real-time kernel in your solution, see improving real-time performance.

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