Jetson AGX Orin - RT Linux without reflashing

[trekar9907]

Hi, i’m trying to change the OS to RT-Linux without reflashing, but i’m a little lost.

I compiled in native the image, following:

Applying a PREEMPT-RT patch to JetPack 4.5 on Jetson Nano

Hi @trueshadow97, this is the guide updated for JetPack 4.5 (L4T 32.5): Real-time Linux for Jetson Nano (L4T 32.5) Install required packages sudo apt-get update sudo apt-get install libncurses5-dev sudo apt-get install build-essential sudo apt-get install bc sudo apt-get install lbzip2 sudo apt-get install qemu-user-static sudo apt-get install python Create folder mkdir $HOME/jetson_nano cd $HOME/jetson_nano Download required files L4T Jetson Driver Package: wget https://developer.nvidia…

This step i skipped because i didnt have any lib/module dir on Linux_for_Tegra/rootfs. But in Linux_for_Tegra/kernel I already have a kernel_supplements.tbz2 file.

@ajcalderont

cd $HOME/jetson_nano/Linux_for_Tegra/rootfs/
sudo tar --owner root --group root -cjf kernel_supplements.tbz2 lib/modules
sudo mv kernel_supplements.tbz2  ../kernel/

Then i read this:

Apply realtime kernel without reflashing

Hello, I applied real-time kernel patches on our kernel image using the method described in this thread: Now I’d like to update our devices that are already at customers and we are not able to reflash the jetsons. Is it possible to apply these changes on a system that was running a non-realtime kernel before? What do I need to run or replace? I guess replacing only the kernel image “Image”-file is not enough, since modules have been changed, too. What steps do I need to do? I am running Je…

But i dont know how to:

@DaveYYY

YES, replace both kernel under /boot/ and kernel modules under /lib/modules/.

Sorry if is an easy question, thanks for the help.

[DaveYYY]

Better read the document first:
https://docs.nvidia.com/jetson/archives/r35.4.1/DeveloperGuide/text/SD/Kernel/KernelCustomization.html#to-build-the-real-time-kernel

If you are compiling natively, just replace every Linux_for_Tegra/rootfs/ in the document with / on your device.