rt patch in jetpack 4.2.1

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
1

Is Nvidia solved the bug related to rt-patch in jetpack 4.2.1?
Is the patch suitable for kernel 4.9.140?

2

Hi,
Yes, the changes will be present in jetpack 4.2.1

3

Thanks for your quick response.
Is someone already used the rt patch in jetpack 4.2.1?

4

Yes, we have used it. We have also applied -rt94 on top of it, but the shipped version -rt93 should also work.

5

Did you use him with the new jetpack (4.2.1)? with kernel 4.9.140?

6

Yes, this is with new JetPack 4.2.1.

root@mystique:~# uname -a | more                                                
Linux mystique 4.9.140-rt94 #1 SMP PREEMPT RT Wed Jul 24 08:56:23 EDT 2019 aarch
64 aarch64 aarch64 GNU/Linux                                                    
root@mystique:~#
root@mystique:~# head -n1 /etc/nv_tegra_release |more                           
# R32 (release), REVISION: 2.0, GCID: 15966166, BOARD: t186ref, EABI: aarch64, D
ATE: Wed Jul 17 00:26:04 UTC 2019                                               
root@mystique:~#
7

Thanks,
Did you follow Nvidia instructions to use the rt-patch?

8

Hi, @anish.aney

Could tell me how to patch preempt-rt for jetson with jetpack 4.2.1 (or R32.2)?
Is there has some reference?

Thanks in advance!

9

I am not sure if there’s any documentation specific to Xavier. But I followed the same steps as were mentioned for TX2. Also, since NVIDIA has updated the rt-patches.sh script to modify the tegra_defconfig file, I didn’t have to update the script for that.

AFAIR, I didn’t update or change anything after the steps. Please let me know if you are seeing any specific issue either while compilation or during runtime.

10

Hi, @anish.aney
Thanks for your rapidly reply.
I’m using TX2 too. I just don’t know the operation steps about how to finish the patch to TX2 (jetpack4.2.1, R32.2) with an preempt-rt kernel.
Could you give me some advices about how to do the patch? like step1, step2 …
That will be pretty nice and thanks in advance!

11

Hello,

Please follow the steps mentioned at:

Look for below comment and follow from there -

Apply PREEMPT-RT patches

These steps are for NANO but apply for Xavier or TX2 as well. If following these steps doesn’t work please let me know the errors you see; compilation or runtime, and I will try to resolve those.

12

Hi, @anish.aney

I succeeded to build the kernel with the rt-patch (4.9.140-rt93)
l have another qeustion,
I want to build kernel module (.ko) on the host
pc with cross compiler using the kernel headers which include the rt-patch.
What is the procedere for this operation?