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It would be better to have some protection of course, the same as with a Raspberry. The pin header can be used via the driver made by Guglielmi:
forum.linuxcnc.org/18-computer/48079-can...cnc?start=200#273554

For Rockpro64 (rk3399?), I built an image before for a Orange Pi 4, but that didn't seem to work well, spikes to 130us, could work with Mesa though. You can try to build one via Armbian, from 6.12 and up you don't really need to patch it, just the right configuration. Then experiment to isolate cpu1 and move the rt tasks to that core as explained in the following post:
forum.linuxcnc.org/18-computer/48079-can...cnc?start=280#286432

You commits caused somewhat of an issue. Do you think I sat on my hands and did SFA ?

I don't care about your workflow, it's not my issue. My issue was ensuring the integrity of the images.
I don't care about you trying to setup a remote desktop, that was something you decided to do. That software was outside the scope of the software needed to run a cnc machine. I don't know why people ignore using ssh.