Raspberry Pi 4 RT Preempt Kernel

apt install python-yapps

wicki published (in another thread) a list of packages to install, that can give a hint.
There are many packages to install

erste.de/raspi4-RT-kernel-howto.html#compile_linCNC_on_Raspi4

Is there any way this can be incorporated into the standard installation procedure?

Hakan wrote: wicki published (in another thread) a list of packages to install, that can give a hint.
There are many packages to install

erste.de/raspi4-RT-kernel-howto.html#compile_linCNC_on_Raspi4

Is there any way this can be incorporated into the standard installation procedure?

What "standard installation procedure" are you speaking about?

JT

I think I have it all sorted out on the RPi4 with preempt rt kernel and LinuxCNC. Here is a screenshot of the latency histogram.


JT

What "standard installation procedure" are you speaking about?

JT

I was thinking of the standard linuxcnc installation.
There is nothing special in that for the RPi4, only the dependencies need to be resolved.
When they are resolved, it is just to compile linuxcnc following the usual linuxcnc instructions.
The raspbian is based on buster so there can be many things gotten for free from the Intel buster.
I guess. I think of the "dpkg-checkbuilddeps" command but don't know how that works.
And I gave away my RPi4 yesterday, so I can't check.

Here is after running all night with 5 glxgears running


JT

Looks pretty good for a pi.
Thank you.

My build instructions are over on my web site gnipsel.com/linuxcnc/uspace/

Just doing it again to make sure I don't have any mistokes.

JT

John,

I walked through the whole Raspberry install and build process today and it worked great except for one minor blip.

"Now build and install LinuxCNC

debuild -uc -us"

should be

"Now build and install LinuxCNC

sudo debuild -uc -us"

I think.....without sudo it would error out and halt.

Thanks for all the effort you put into this John!!

You can download pre-built preempt-rt kernels here:

packages.debian.org/search?keywords=linux-image-rt

Or you can download a Raspian SD card image, with preempt-rt kernel from here:

unofficialpi.org/Distros/RealtimePi/nightly/