RPI4 Raspbian 64 bit & LinuxCNC

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5 years 7 months ago #202198 by tjmarch
The kernel is non-real-time that is why my cam works, is this ok to use? Kernel must have been configured as low latency but not Full Real Time option before compile. Elovalvo maybe you could give info on which Real Time option, General -> Preemtion Model was selected before compiling this kernel

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5 years 7 months ago - 5 years 7 months ago #202316 by elovalvo
I confirm that the version in this link
forum.linuxcnc.org/9-installing-linuxcnc...xcnc?start=10#181585
was compiled with the Full Preempt option.

Maybe tjmarch made an update that changed the contents of the /boot/config.txt file.

What answer do you get to the terminal command: 'uname -a'?
It should be 'Linux raspberrypi 5.4.80-rt44-v8+'
Last edit: 5 years 7 months ago by elovalvo. Reason: Add a question

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5 years 7 months ago #202345 by Kiddekanin
Want a small RPI4 inside your QTplasmac controlcabinet =?

-RPI4 uses OPENGL ES
-QTVCP is OPEL GL
(to my understandings)

* I struggled way to long with trying to install / modify my plasmaC to be the new cool qtPlasmaC, only to find out it is not supportet by the RPI4

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5 years 7 months ago - 5 years 7 months ago #202565 by tjmarch
The problem is when you invoke Linuxcnc or latency-test form the command line. It says it is running Posix non real-time. If it were compiled with fully RT kernel option it would say running real-time. I suspect it was compiled with low latency desktop option. The full RT kernel option is not a available option when compiling some newer kernels. If it were compiled with low latency decktop I am just wondering if this option is good enough to use. And to note I have not made any changes to the /boot/config.txt file and uname -a still reports a RT kernel label which is just a label that is added by the RT patch for the kernel being compiled
Last edit: 5 years 7 months ago by tjmarch.

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5 years 7 months ago #202664 by andypugh

tjmarch wrote: The problem is when you invoke Linuxcnc or latency-test form the command line. It says it is running Posix non real-time.


This can happen if you have compiled run-in-place but have not run the linuxcnc-dev/scripts/rip-environment script to set up the command-line session.

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5 years 7 months ago #202706 by tjmarch
Thank you Andy for the information. But I have a question if LCNC was installed with Deb files do you have to invoke rip environment? Because I installed LCNC with Debs, not a rip environment install.

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