Flash AGX Board with only tow dtb files

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
1

Hi all
We want to flash our AGX Xavier Board and we use the Jetpack 4.6. We have already installed an SSDnvme,
I am following this link:
https://docs.nvidia.com/jetson/archives/r34.1/DeveloperGuide/text/SD/Clocks.html#to-use-pllaon-as-clock-source
Our goal is to enable the PLLAON clock to use the CAN Network. We already modified the kernel DTB and BPMPFW DTB and we want only flash these 2 files on the board.
My questions are:

  • We tried to flash the board with the boot located in eMMC, but nothing happened and the dtb files are not updated. I noticed that there are 2 boot folders: in eMMC and in SSD. So, which one, the board use?
    Also, I checked the boot.config, and I found that is configured to boot from nvme.
    If I have to flash the nvme, how can I do it please?
    Thank you.
3

hello mokhtar.bouain,

please check /boot/extlinux/extlinux.conf, if there’s FDT entry, it’ll prior to load device tree blob via file system.
since you’ve flashing to the kernel-dtb partition, please remove that entry for loading via partition.

4

Hello,
There is no FDT entry.
Please, find the attached file, the used extlinux.conf
extlinux.conf (864 Bytes)

Best regards
Mokhtar

5

hello mokhtar.bouain,

please share your commands to update device tree,
please also setup serial console to check you’ve apply device tree correctly.
thanks

6

Ok, please find in the attached file, the results of the setup serial console.
Also, to flash the board, we use :

sudo ./flash.sh -k bpmp-fw-dtb jetson-xavier mmcblk0p1
sudo ./flash.sh -k bootloader-dtb jetson-xavier mmcblk0p1

uart_Xavier.txt (43.3 KB)

Thx,

7

hello mokhtar.bouain,

you should update bpmp-fw-dtb and kernel-dtb.

8

Hi Jerry,
Can you give us more details about that please? How we do the update?
Thanks you

9

hello mokhtar.bouain,

here show the steps to update bpmp-fw-dtb

  1. you’ll need to decompile the BPMP DTB to have modification.
  2. recompile BPMP DTB, and copy the new BPMP DTB into… bootloader/t186ref/
  3. perform flash script for partition update… $ sudo ./flash.sh -r -k bpmp-fw-dtb jetson-agx-xavier-devkit mmcblk0p1

for the steps to update kernel-dtb, you may build from kernel sources or decompile/recompile from the target’s binary file.
please copy the new kernel-dtb file into… kernel/dtb/,
and, here’s flash script for partition update… $ sudo ./flash.sh -r -k kernel-dtb jetson-agx-xavier-devkit mmcblk0p1

10

Hi,
It works now.
Thanks

12

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