Does anyone have an RTAI kernel and a version 2.9 built on it?

Should be fixed now. (at least for bookworm)

Thanks Andy,
For the moment it is an update on Buster to 2.8.4 rtai
My configuration works, I finally have enough HAL memory.
Everything is working, remains an "invalid parameter message" 
with one of my components :



and the parasitic cursors of my OLED is persistent now

Could you not use the "message" HAL component?

linuxcnc.org/docs/stable/html/man/man9/message.9.html

Sorry, I don't remember why I didn't use the original component?

the exact error message is "Invalid module format"

message.ko compiled under 2.8.4 but not tested by running linuxcnc.

To compile the component you will need the linuxcnc-dev package.

Exactly which OS, kernel and LinuxCNC version do you need the linuxcnc-dev package for?

My current configuration:
 
Debian Buster linuxcnc 2.9.1 rt
RTAI: 4.19.195-rtai-amd64

my configuration has a dozen custom components
all compiled under linuxcnc-dev 2.8.4
only one is not accepted by 2.9.1

Andy, if it's too much work I can wait for a full iso rtai version
with Bookworm. I am reassured now that my configuration works
with the possibility of evolving from 2.7.15

thanks again and happy Christmas  !