Linuxcnc Image for Raspberry Pi 3

Does anyone have an image they could share for Linuxcnc for a Pi 3? I know this Pi is not as preferred as the 4, but it should do fine with the 7C80 I have it mounted on (using SPI instead of ethernet). Most of the links I have found in this forum using the search no longer work.

Thanks,

Travis

My understanding is that that image is for the Pi4. I did try it however, and it did not boot on the Pi3- I got a rainbow screen with no progress from there.

Thanks though!

I think I'd try getting Debian 11 up and running. Then get the preempt_rt  kernel from the debian repos.
You will need to compile Linuxcnc from scratch but that is not overly hard (not sure on the Pi though)

This just came up on Youtube yesterday.
It's not a link to a compiled image but worth a look.



I have just compiled linuxcnc on an Xubuntu system to use as a simulator for checking gcode files, it is not difficult just a bit of a faff managing dependencies.

After some research and fiddling, I was able to get the 2.8.0 image to boot on my PI 3B!

In config-rt.txt file on the SD card (once the image was flashed to the SD using the Raspberry PI tool) I changed this:

[pi4]
kernel=vmlinuz-4.19.71-rt24-v7l+
force_turbo=1

to this:

[pi3b]
kernel=vmlinuz-4.19.71-rt24-v7l+
force_turbo=1

I still got the CPU 0 error on initial power up, but it seems to boot and work just fine. 

On version 2.8.1, I did the above, plus renamed the kernel from kernel7l to kernel, and it booted just fine as well!