Jetson not using FDT setting in extlinux.conf

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
1

I have a Xavier NX setup to boot from NVME with Jetpack 5.0.2. It is flashed using this command:

sudo ./tools/kernel_flash/l4t_initrd_flash.sh --external-device nvme0n1 -c ./tools/kernel_flash/flash_l4t_nvme.xml -S 30GiB --showlogs jetson-xavier-nx-devkit-emmc nvme0n1p1

It works fine and the device tree changes I have made can be found in /proc/device-tree. The problem is that I would like to set the device tree using the FDT option in the file /boot/extlinux/extlinux.conf. however no changes made here seem to do anything.

Here is the content of the file:

TIMEOUT 30
DEFAULT primary

MENU TITLE L4T boot options

LABEL primary
      MENU LABEL primary kernel
      LINUX /boot/Image
      FDT /boot/dtb/kernel_tegra194-p3668-0001-p3509-0000.dtb
      INITRD /boot/initrd
      APPEND ${cbootargs} root=/dev/nvme0n1p1 rw rootwait rootfstype=ext4 console=ttyTCU0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0

I have also tried to replace the file in /boot/dtb without changing the name, and it also has no impact.

This is annoying to me because I would like to be able to boot from NVME, and modify the device tree without having to flash the jetson.

Any help appreciated.

3

Please check if you also have another extlinux.conf on emmc. If so, modify that file and see if the result changes.

4

Thanks Wayne,

It looks like (as usual) you are correct. I didn’t expect this to be the case because I had formatted the emmc before this most recent flash. Are there settings I can change such that the extlinux.conf file from the NVME is used?

6

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