Linuxcnc & the Raspberry Pi (4 & 5) Official Images Only!!!

tommylight wrote:

Not me.

But surely someone knows who does it.

I created the original 2.9.2 image, but have not touched it since. I don't have a pi to do anything further. I think Andy may have rebuilt later versions.
We had no choice but to build the kernel from the official pi source back then.
I think there could be better ways to do this as preempt_rt is now supported.

I tried this method (but did RIP instead):

forum.linuxcnc.org/9-installing-linuxcnc...th-preempt-rt-kernel

and the latency was horrid. The thread is from Dec 2022 thought it seems, so maybe there is a better way?

The latency isn't very good on the 2.9.8 image from the downloads page either, but not as bad as it was following the above guide. Maybe that's to be expected?

Everything just feels sluggish, and "jerky".

Is it a Pi5 or 4b? the 4b was always a bit marginal but some say the 5 is flawless for them.

You could try the Respberry way perhaps. Once you get the RT kernel sorted, just compile linuxcnc

forums.raspberrypi.com/viewtopic.php?t=396623