On 9/14/22 17:27, Phill Carter wrote:
On 15 Sep 2022, at 4:53 am, Sebastian Kuzminsky <s...@highlab.com> wrote:
Does anyone know if there's a well-liked pre-built official or
community-supported Rpi4 realtime kernel somewhere?
Not sure how modern you want but the kernel on the image here is
5.15.27-rt35-v8+
<https://forum.linuxcnc.org/9-installing-linuxcnc/39779-rpi4-raspbian-64-bit-linuxcnc?start=130#238020
<https://forum.linuxcnc.org/9-installing-linuxcnc/39779-rpi4-raspbian-64-bit-linuxcnc?start=130#238020>>
That's great, thanks Phill! It linked to just what I was looking for:
<https://github.com/kdoren/linux/>
That's a fork of the official RPi kernel, reconfigured for Preempt-RT,
with prebuilt debs for armhf & arm64.
The debs installed on top of a clean up-to-date pi-gen Bullseye armhf
image (so Raspberry Pi OS aka Raspbian, not the real Debian).
The latest "release", 5.15.65-rt49, did not boot on my Rpi4, but the
previous one, 5.15.40-rt43, did. Latency is a bit worse than Raspbian
Buster with the 4.19.71-rt2 kernel but probably usable.
--
Sebastian Kuzminsky
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