Jetson Orin with wrong image?

[Maik2008]

Hi, I want to compile a real-time kernel and install the preempt_rt patch for a Jetson AGX Orin in an Ubuntu 22.04 environment. Currently, I want to modify the boot configuration file located at /boot/extlinux/extlinux.conf to enable booting into the real-time kernel upon startup.

The content of the extlinux.conf file is as follows:

TIMEOUT 90
DEFAULT primary

MENU TITLE L4T boot options

LABEL primary
MENU LABEL primary kernel
LINUX /boot/Image
INITRD /boot/initrd
APPEND ${cbootargs} root=PARTUUID=d889d91e-7b1a-4cd1-9e67-b1fb2d219d11 rw rootwait rootfstype=ext4 mminit_loglevel=4 console=ttyTCU0,115200 console=ttyAMA0,115200 firmware_class.path=/etc/firmware fbcon=map:0 nospectre_bhb video=efifb:off console=tty0 nv-auto-config

LABEL realtime
MENU LABEL realtime kernel
LINUX /boot/vmlinuz-5.15.148-rt74
INITRD /boot/initrd
APPEND ${cbootargs} root=PARTUUID=d889d91e-7b1a-4cd1-9e67-b1fb2d219d11 rw rootwait rootfstype=ext4 mminit_loglevel=4 console=ttyTCU0,115200 console=ttyAMA0,115200 firmware_class.path=/etc/firmware fbcon=map:0 nospectre_bhb video=efifb:off console=tty0 nv-auto-config

I am wondering how the following two lines should be modified:

LINUX /boot/vmlinuz-5.15.148-rt74
INITRD /boot/initrd

Specifically, should the INITRD path for the real-time kernel be the same as in the LABEL primary section? I changed it to INITRD /boot/initrd.img-5.15.148-rt74, but the system freezes at the startup screen and fails to boot.

By a way, when i input “sudo make install” in a terminal.

Is there anything wrong with that?

Thanks!

[DaneLLL]

Hi,
We would suggest re-flash the system to enable RT kernel. Please refer to the steps to build RT kernel, apply to Linux_for_Tegra folder, and re-flash the system:

Kernel Customization — NVIDIA Jetson Linux Developer Guide 1 documentation

[Maik2008]

Hi,

thanks for your rely. I have now successfully installed the rt-kernel.

But i got another problem, i can’t find the wifi-driver of RT-kernel.

Meanwhile, the wifi-diver of the primary kernel is OK.
Can you help me find wifi?

Thanks

[kayccc]

If still an issue on wifi, please help to open a new topic, thanks