Hi guys, We are struggling to understand if and how the device tree gets updated on a Jetson-TX2. A rootfs image created by yocto (“zeus”) does not seem to update the device tree when updating through mender. How can we update the device-tree partition(s)? Thanks!

Yep, that’s the problem. I think this is due to some recent commits in meta-tegra that need some corresponding changes in the meta-mender-community/meta-mender-tegra layer. I have some changes on a branch in my fork of that repository that should fix this. In particular, this commit .

Parts of the BUP payload, like the DTB, are specific to a version of the TX2 module you have in your device. Only if a copy in the payload matches the version of your module will nv_update_engine install it. The version information it uses for matching is in /etc/nv_boot_control.conf on the TNSPEC …

Thanks for your help! Here is the requested output [2020-06-30 13:57:57] root@jetson-tx2:~# cat /etc/nv_boot_control.conf [2020-06-30 13:57:59] TNSPEC 3310-D00-1000-F.0-1-0-jetson-tx2-mmcblk0p1 [2020-06-30 13:57:59] TEGRA_CHIPID 0x18 [2020-06-30 13:57:59] TEGRA_OTA_BOOT_DEVICE /dev/mmcblk0boot0 …

and for what it’s worth I get this when I grep for 3310 in the bl_update_payload (not sure if it’s relevant): root@jetson-tx2:~# strings /opt/ota_package/bl_update_payload | grep 3310 3310-1000-B00-A

Yes, that’s the problem, then. If you’re using the zeus branch in meta-tegra (based on L4T R32.2.3), BUP payloads built only support a single board revision. The zeus-l4t-r32.3.1 branch builds multi-spec BUP payloads, and it should be including the necessary artifacts for the revision D00 FAB.

We are on the zeus-l4t-r32.3.1 branch, actually. Is there a specific (recent) commit that we need to be aware of? Is is possible to misconfigure/misuse this feature somehow on our end? Can I check something in my build to verify the generation of the payload works as expected? Thanks!

I tried to dig a bit deeper. But to be honst I don’t quite understand how the different bup payloads are getting build and deployed. I see multiple payloads being deployed in the images directory (e.g. u-boot-dtb.bin.bl_only.bup-payload) but they all contain only the 3310-1000-B00-A string. But the…

Should this build result in one BUP package that will work on all specified board revisions? It should, yes, once it’s done. You can verify this with the BUP_generator.py script, which you can extract from the L4T BSP (in the Linux_for_Tegra/bootloader directory). Example from one of my builds: …

Hi @madisox , I have the feeling I am missing something very basic in my configuration. This is the output for the same file on my build. There are no devicetrees included: > naro@naro:~/drive_yocto/yocto_43/build/tmp/deploy/images/jetson-tx2$ ./BUP_generator.py -c u-boot-jetson-tx2.bin.bup-payloa…

Yes, that’s definitely incomplete. Check the log file for the u-boot-bup-payload do_deploy task, which should be at $BUILDDIR/tmp/work/jetson_tx2-poky-linux/u-boot-bup-payload/1.0/temp/log.do_deploy (or something similar, depending on your distro configuration). I have seen cases where the BUP gen…

Ok, some of the sections look suspicious. It seems the script can’t find relevant files. Do I interpret that correctly? Is there a dependency missing? [ 7.0670 ] Copying signed file in /home/naro/drive_yocto/yocto_43/build/tmp/work/jetson_tx2-poky-linux/u-boot-bup-payload/1.0-r0/bup-payload/signe…

Jetson-TX2 - updating device-tree

General Discussions

jgrahsl July 2, 2020, 11:45am 19

I can confirm that these patches enabled me to update the dtb using nv_update_engine.

Thank you @madisox and @naro

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Jetson-TX2 - updating device-tree

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