Debian 12 RTAI

Whenever I see:

CANNOT FIND MAILBOX

This is because the RTAI kernel image and the modules are not built against each other. The RTAI modules package must be built against the RTAI kernel you wish to use. If you mix and match, you will run into problems.

If TCL/Tk is seg faulting, I have no idea but it's unrelated to RTAI.

LinuxCNC also needs to be built against the same RTAI modules and kernel packages as well otherwise you'll have problems either building or loading LinuxCNC's kernel modules as well. When you see "CANNOT FIND MAILBOX" please post `dmesg` so I can see what's going on.

edit: It is confirmed that there's a mismatch between the kernel image and the rtai-modules package. JT, you're not doing anything wrong from what I see, the debs are just bugged and need a rebuild against the kernel (rtai-modules and linuxcnc)

Andy, please use the latest checkout of my master branch. It has the GNU11 stuff and the musl math library is moved into kbuild as well.

Cheers!

Alec

I run modinfo on the linuxcnc modules and it reported the modules matched the kernel. Is this naive of me expecting this to be correct ?
Output of the command is on the first page of this thread.

modinfo just checks against the kernel version, the rtai-modules package do not match the kernel image package so the linuxcnc debs are inherently broken too.

forum.linuxcnc.org/9-installing-linuxcnc...ng-rtai-debs-for-2-9 new RTAI debs here with instructions

Successful install here Bari. Now to get Ethercat working.

NickH wrote:

Successful install here Bari. Now to get Ethercat working.

From memory PREMPT_RT is a prerequisite for ethercat. In any case without a base thread with ethercat, there is not really a case for RTAI so it should not be an issue.

I have some tricks here to manage latency docs.google.com/document/d/1jeV_4VKzVmOI.../edit?usp=drive_link