Real-time kerel not detected on patched 6.12

rodw
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12 Jan 2025 03:05 #318733 by rodw

Replied by rodw on topic Real-time kerel not detected on patched 6.12

royka wrote:
For Raspberry I think following this guide should help: github.com/by/RT-Kernel

Only after git clone, download this patch:
forum.linuxcnc.org/media/kunena/attachme...ernel-realtime.patch
Then enter the Linux folder and enter: git apply ../sys-kernel-realtime.patch
After make menuconfig make sure that these are also selected:
forum.linuxcnc.org/38-general-linuxcnc-q...6-12?start=10#315643

This does not work in all build environments. I think Cornholio is correct

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cornholio
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12 Jan 2025 04:53 #318738 by cornholio

Replied by cornholio on topic Real-time kerel not detected on patched 6.12

royka wrote:
Like you assumed before I think those patches indeed didn't make it to the mainline kernel, but those are not needed to make a fully preemptible kernel.

The sysfs patch is only needed because LinuxCNC checks that indicator. Later I saw that the source of Raspberry also already has the arch_supports_rt in the kconfig.

Whilst it does have that it's not the correct value.....from the required patch I've used with 6.1.69

config ARCH_SUPPORTS_RT
-    bool
+    def_bool y

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