Tiny Core Linux
Tiny Core Base => Raspberry Pi => Topic started by: cosminbro on June 16, 2023, 04:16:43 PM
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How can I configure a realtime kernel in piCore 13.1 64 bit?
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You have to build it yourself. I quit doing it when the rt patches would not cleanly apply nor yield a stable system. I haven’t looked in a year or so, but perhaps someone is maintaining a rpi rt kernel source.
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You have to build it yourself. I quit doing it when the rt patches would not cleanly apply nor yield a stable system. I haven’t looked in a year or so, but perhaps someone is maintaining a rpi rt kernel source.
The problem is I can't find the realtime patches for kernel 5.10.77 (piCore 64 13.1), nor kernel 6.1.25 (piCore 64 14.0).
https://wiki.linuxfoundation.org/realtime/start
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The newest piCore 8 with kernel 4.4.39 has realtime patch available, but I think this kernel it's too old....
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Start here https://wiki.linuxfoundation.org/realtime/preempt_rt_versions. You will have to apply the rt patches against the rpi kernel tree. It is not easy.
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Ok, the latest rt patch for kernel 6.1 is https://cdn.kernel.org/pub/linux/kernel/projects/rt/6.1/patch-6.1.33-rt11.patch.xz
My question is, if piCore 14 64bit has kernel 6.1.25, which patch should by apply from 6.1 folder (https://cdn.kernel.org/pub/linux/kernel/projects/rt/6.1/) ? Should I apply the latest patch, respectivelly patch-6.1.33-rt11.patch.xz ?
Thanks
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You are going to have to build the kernel and modules anyway. Just pull the matching kernel from rpi, Then apply the patch.
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Everything is ok now, except one thing.
I compile piCore 64 bit with kernel 6.1.25, and, when I try to install alsa.tcz, it get me an error:
Downloading: alsa-modules-6.1.25-rt11-piCore-v8.tcz
Connecting to repo.tinycorelinux.net (128.127.66.77:80)
wget: server returned error: HTTP/1.1 404 Not Found
md5sum: alsa-modules-6.1.25-rt11-piCore-v8.tcz.md5.txt: No such file or directory
Error on alsa-modules-6.1.25-rt11-piCore-v8.tcz
Of course, there is no file with such name. I unsquash the existing alsa-modules-6.1.25-piCore-v8.tcz and I modify the subfolder name from lib/modules to 6.1.25-rt11-piCore-v8.tcz
After reboot, ALSA still doesn't work....
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Hi cosminbro
Reread the last post by Paul_123:
You are going to have to build the kernel and modules anyway. Just pull the matching kernel from rpi, Then apply the patch.
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I already rebuild the modules. I also rebuild alsa-modules-6.1.25-rt11-piCore-v8.tcz with drivers from new compiled modules one. Still ALSA doesn't work.
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Did you build the kernel and modules -6.1.25-rt11-piCore-v8.gz. For the boot partition, And then alsa-modules extension.
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Did you build the kernel and modules -6.1.25-rt11-piCore-v8.gz. For the boot partition, And then alsa-modules extension.
It's something strange here. I'm using config file 6.1.25-piCore-v8_.config.xz and the folder sound is included in generated modules. Isn't the same folder sound from inside the tcz alsa-modules extension?
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Hi cosminbro
Is your new kernel finding the ALSA modules? If you run this:
modinfo soundcoreDoes it return information about soundcore.ko?
Do the filename: and vermagic: fields contain 6.1.25-rt11-piCore-v8 ?
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That’s just packaging. Modules in extensions are in /usr/local/lib/modules/xxxxxxxxx
There is a symlink in /lib/modules/ xxxxxx that points there. If that link isn’t right, depmod won’t find the modules. Your extensions can use the /lib/modules path.
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I manage to get all work! Thanks.
Next, I want to repack the picore installation image with these modifications. How can I do this?
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Just use an imager program to make an image of your sdcard.
Or Google how to mount images and partitions, then copy the new files.
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that is available for Rpi music distro...... on some pi arm builds.....RT kernel
thx
c
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After many tests, I made a conclusion: realtime kernels based on piCore seems to work best on RPI4 or CM4 based machines. Things aren't so stable on older rpi based devices.
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That's possible, I quit maintaining a RT kernel due to stability issues right around the time the pi4 came out.