RT preempt update

Juerg Haefliger juerg.haefliger at canonical.com
Tue Sep 1 12:28:20 UTC 2020

On Sat, 15 Aug 2020 22:19:18 -0700
Dongjune Chang <Dongjune.Chang at asu.edu> wrote:

> Hi, I am Dongjune, a student working on some robotics projects using the
> Raspberry Pi4.
> What I just try to do is :
> 1) [Already got success!] Update Ubuntu 18.04.5 LTS (GNU/Linux
> 5.4.0-1015-raspi aarch64)
> I downloaded it from the official Raspberry PI site.
> 2) Apply to patch Preempt Real-time (RT) kernel
> base on this:
> https://chenna.me/blog/2020/02/23/how-to-setup-preempt-rt-on-ubuntu-18-04/

Are you sure you need RT? You might want to consider using the
soon-to-be-released PREEMPT kernel (low-latency). It's not RT but for most use
cases it's sufficient.

> but since the RP4 is a little bit different from pure 18.04,
> make -j8 deb-pkg  sudo dpkg -i
> ../linux-headers-5.4.19-rt11_5.4.19-rt11-1_arm64.deb
> ../linux-image-5.4.19-rt11_5.4.19-rt11-1_arm64.deb
> ../linux-libc-dev_5.4.19-rt11-1_arm64.deb
> Even though I got success in making deb-pkg (first line), but RPI4's RT
> kernel is not perfectly updated (these deb files are generated and
> installed).

I'm not sure what you're trying to say. Note that an Ubuntu kernel is built
differently and doesn't use the kernel's Makefile. See:

> Could you give me any advice about my troubleshooting?

You have not clearly stated what your problem is and what you need help with.
Please clarify.


> Best regards,
> Dongjune

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