Flashing Device Tree to NVMe

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
#1

I am currently trying to update the device tree on an installation to a Xavier NX module. I have successfully installed JetPack 4.6 to the NVMe SSD with sdkmanager and have been trying to add a custom device tree. I can load the device tree using extlinux.conf but I am looking into flashing it to the relevant partition.

I am attempting to update the flash using the flash.sh script in ~/nvidia/nvidia_sdk/JetPack_4.6_Linux_JETSON_XAVIER_NX_TARGETS/Linux_for_Tegra. I believe that this is the correct command:

sudo ./flash.sh -r -k kernel-dtb -d ~/JetStream/4.6/Linux_for_Tegra/source/public/kernel/kernel-4.9/arch/arm64/boot/dts/tegra194-p3668-all-p3509-0000.dtb jetson-xavier-nx-devkit-emmc nvme0n1p1

However, I see the following error:

Error: Return value 13
Command tegradevflash_v2 --write kernel-dtb 1_kernel_tegra194-p3668-all-p3509-0000_sigheader.dtb.encrypt
Failed to flash/read t186ref.

The reference to t186ref suggests to me that it is using the wrong definition somewhere.

The Xavier NX module is hosted on a carrier board designed by my employer.

I have attached a log of the output from the flash script.
flash.log (71.1 KB)

#2

  1. flash.sh is not able to flash any content to the external drive. If you use command like that, it will just flash to kernel-dtb partition over emmc and tell kernel to mount file system from nvme.

  2. Please remove -d and the path. Directly put your dtb file to BSP folder /kernel/dtb and see if it can flash.

#3

I can use:

sudo ./flash.sh -r -k kernel-dtb -d
~/JetStream/4.6/Linux_for_Tegra/source/public/kernel/kernel-4.9/arch/arm64/boot/dts/tegra194-p3668-all-p3509-0000.dtb jetson-xavier-nx-devkit-emmc mmcblk0p1

to program the on-board eMMC.

If I can’t use flash.sh to program the NVMe, what should I use? As I say, sdkmanager is able to write to the NVMe, so clearly it can be done.

#4

There is no much tool that can flash to external drive. It is new feature. If you are using release < rel-32.6, then none of them can flash to external drive.

You can refer to initrd flash in the document.
https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/flashing.html#wwpID0E0PI0HA

#5

Thank you; I have found that

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

will write the device tree, but it also overwrites the entire OS. Is there any way to write just the device tree or is this a limitation of the tool?

#8

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