Raspberry Pi 4 with PlasmaC

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08 Jun 2020 22:31 - 08 Jun 2020 22:33 #170715 by PCW
Replied by PCW on topic Raspberry Pi 4 with PlasmaC
If you launch LinuxCNC from the command line,
does it say:

"Note: Using POSIX realtime" ?

You may have missed the part where you select "Fully Preemptable Kernel"
in the configuration editor (or forgot to save the modified config file)
Last edit: 08 Jun 2020 22:33 by PCW.

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09 Jun 2020 01:22 - 10 Jun 2020 01:58 #170737 by phillc54

I added isolcpus = 1,2,3

But I stll get hm2/hm2_7i96.0: error finishing read


I had this same issue and it went away after I changed the servo period to 2000000. I didn't try find out why as it seems to work ok at this servo period.

This is mine after 48 hours:


Below is a link to my complete /boot directory. The elf files are for the beta bootloader discussed here

drive.google.com/file/d/1jG5ZZrtoZnuGZBr...5TC/view?usp=sharing

EDIT: This is now a complete image forum.linuxcnc.org/plasmac/39179-raspber...smac?start=80#170904
Attachments:
Last edit: 10 Jun 2020 01:58 by phillc54.
The following user(s) said Thank You: tecno

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09 Jun 2020 07:10 #170769 by tecno
Replied by tecno on topic Raspberry Pi 4 with PlasmaC
So a question.

Is it that easy to fix a new Buster on SD and copy your /boot (not cmdline.txt as I stil want to run on SD until I get SSD)?

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09 Jun 2020 07:22 #170772 by phillc54
It won't give you the full Buster, only the realtime kernel.

I think if you copy:
overlays directory
*.dtbfiles
kernel7l-rt.img
config.txt
cmdline.txt

it should work.

Of course keep backups of your originals

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09 Jun 2020 07:24 #170773 by Mike_Eitel
If you ask the transfer from sd to ssd.
7use read in windisk imager to copy sd to pc-disk
Use windisk or i prefere etcher to transfer that copy to ssd.
Working like a charm
Mike

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09 Jun 2020 07:25 #170774 by tecno
Replied by tecno on topic Raspberry Pi 4 with PlasmaC
Will give it a go and report my findings.

Thank you Phil

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09 Jun 2020 07:28 #170775 by phillc54

If you ask the transfer from sd to ssd.
7use read in windisk imager to copy sd to pc-disk
Use windisk or i prefere etcher to transfer that copy to ssd.
Working like a charm
Mike


Yes, I always use Balena Etcher and it always works.

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09 Jun 2020 08:56 #170784 by tecno
Replied by tecno on topic Raspberry Pi 4 with PlasmaC
Sorry but that was a no-go = still only SMP

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09 Jun 2020 09:11 #170786 by phillc54
did you use my config.txt, that is where the rt kernel is selected.

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09 Jun 2020 09:23 - 09 Jun 2020 09:24 #170788 by tecno
Replied by tecno on topic Raspberry Pi 4 with PlasmaC
No :( PARTUUID is for your USD drive ?
Last edit: 09 Jun 2020 09:24 by tecno.

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