As my newly installed Bookworm linuxcnc will not run the spindle (link below), can I just add the configuration files to a fresh Buster install or will it need some converting?
But see my reply to the other thread for an alternative solution.
You seem to be mis-identifying the likely cause, it isn't because you have moved from Buster to Bookworm, but because you have updated from 2.7 to 2.8+ and the spindle HAL pin names have changed to support multiple spndles.