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I don't see this issue on a current RIP build.
Are you by chance using a Wayland desktop and/or a non English locale?
 

Correct, they are visible under /dev/

It is PREEMPT_RT

enabled RT when building.

With regards to the RPi5 images Rodw linked to a new one on his google drive that seems to fix the screen issues. This is the one I used recently with my RPi5.

If the SPI interface isn't enabled mesaflash will give
open: No such file or directory

So I would guess the SPI interface has been enabled and the nodes created under the /dev directory.

The kernel is not going to work anyway since its not realtime

The way I built my RPI5 test system was that I downloaded the RPI5 image
from the LinuxCNC website:

www.linuxcnc.org/iso/rpi-5-debian-bookwo...23-11-17-1520.img.xz

Installed it and then built linuxCNC master from source.

I wonder if something in config.txt could be an issue also... (since the cable and 7C80 seem to work)