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Debian includes a RT kernel for the Pi 4b and it is possible to get a working RT linuxcnc install using the Debian images. But the RT kernel was not installed as a dependency from linuxcnc-uspace and needed installing separately with something like sudo apt install linux-image-rt-$uname -r) (might not have that correct. The only catch is that the images only install a text terminal with a root user. You needed to add a user, add sudo rights and then install xfce to get a working system ut it is quite doable. Sadly it does not appear support continued to the pi5.

For the Pi5 users:
www.linuxcnc.org/temp/linuxcnc-uspace_2.9.7pre_arm64.deb

@f355

I've tried looking for a RT_PREEMPT kernel in the repos, but could only find kernels that were configured for Real time not Preemptive real time (which is what Linuxcnc requires).
Debian doesn't have any support for the RPi5 as it doesn't have enough upstream kernel support.
wiki.debian.org/RaspberryPiImages#Overview

and

raspi.debian.net/tested-images/

So to get a full RT_PREEMPT kernel the only solution it would seem is to roll our own. Which would not be a suitable solution for upgrading.

One solution maybe if Linuxcnc could host suitable kernels, but I really don't see the sense in a regular upgrade regarding the kernel in this situation. I'm still running the original kernel that was built whilst building the image in Jan 2025.

BTW running pi-gen builds a couple of flavours of images everything from lite to a fully image. Tho it does use a significant amount of disk space.

I am using the Trixie version of live-build, and building on Trixie.
(I basically did a search-replace for "bookworm" in linuxcnc-live-build and swapped to Trixie. though manually and checking surrounding code.)

So I am puzzled where the splash has gone to..

Was replying to you on the laptop but didn't have the ISO there so had to swap machines. Well creakily walk upstairs, I swear I've skipped old age and just gone straight to decrepitude......enough banter.

I guess this is what your are referring to. I would say it appears as it should. Mind I haven't had a chance to test on real hardware yet.


Basically I started with a fresh fork from your repo and made the changes I thought would be required. 
Me repo and branch can be seen here, I've tried to comment the changes made within the files and within the commits as well. I think I've even mentioned using the live-build version as well.
github.com/ozzyrob/linuxcnc-live-build/tree/ozzyrob-trixie-test

Whilst I was building on my Bookworm machine I did build a live-build package & install using this the below linked codebase, installing the Trixie package on Bookworm didn't give successful results:
If using a Trixie machine to build everything should be ok. I also found using the same source and building a package for Mint 22.1 gave a successful ISO. I think I may have mentioned this before.
salsa.debian.org/live-team/live-build/-/...rixie?ref_type=heads
Which is the code base for the live-build package for Trixie.

I hope this helps.
Cheers Rob