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Thanks tommylight,

I'm trying to install the RTAI version of the kernel, but I'm having no luck.  I'm not sure where I'm going wrong.

I installed from the linuxcnc_2.9.4-amd64.hybrid.iso .

So I think I covered Step 1 of 7.2 in the instructions at linuxcnc.org/docs/html/getting-started/g..._installing_linuxcnc

From there I did step 4 of 7.1, but that causes an issue with "Conflicting values".

I tried (forum.linuxcnc.org/9-installing-linuxcnc...-kernel-on-debian-12), but with 2.9.4:

Try just installing the Linuxcnc package, after removing the docs package

wget linuxcnc.org/dists/bookworm/2.9-rt/binar...xcnc_2.9.2_amd64.deb

sudo apt install ./linuxcnc_2.9.2_amd64.deb

The issue is with the docs package, which isn't really required for a basic install.

But, it appears there is no 2.9.4 version.  So I tried 2.9.3, but that is giving me all kinds of errors.

First is there a 2.9.4 version of the RTAI kernel?
If not, should I have tried to install from the 2.9.3 iso instead?
 

For the rockpro 64 the first 2 cores (0,1) are the faster ones. To move the RT processes to cpu1, you can run this script as root (rename to prio.sh)
 

This was the rt kernel I made for the rk3399 back then:
drive.google.com/drive/folders/12VfNmKC3...zaNAk2EN5sHDfeCnnzYX
Maybe you've more luck with using the script (don't forget to hit the reset button in latency-histogram after running the script.)

With the Orange Pi 5 plus, when I split the processes to core 5 and 7 with the script above the latency with base thread is better with Linux 6.13