Raspberry Pi 4 RT Preempt Kernel

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18 Aug 2019 15:28 #142442 by fixer
apt install python-yapps
The following user(s) said Thank You: BigJohnT

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18 Aug 2019 18:39 #142450 by Hakan
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?

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18 Aug 2019 23:42 #142463 by BigJohnT

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

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18 Aug 2019 23:45 - 18 Aug 2019 23:47 #142464 by BigJohnT
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
Last edit: 18 Aug 2019 23:47 by BigJohnT.

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19 Aug 2019 07:52 #142477 by Hakan


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.

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19 Aug 2019 11:06 #142486 by BigJohnT
Here is after running all night with 5 glxgears running


JT
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19 Aug 2019 13:15 #142491 by tommylight
Looks pretty good for a pi.
Thank you.

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21 Aug 2019 23:24 #142749 by BigJohnT
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

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20 Nov 2019 03:51 - 07 Apr 2020 09:38 #150716 by qwerasdferty
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!!
Last edit: 07 Apr 2020 09:38 by qwerasdferty.

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24 Nov 2019 22:42 #151154 by andypugh
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/

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