Runtime update the dtb without USB on jetson xavier

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
1

Hi,
i want to update dtb without USB ,i found 2 ways to do that. the first is A/B update,the second is to modify the file extlinux.conf. But None of them could work.

  1. when i used the second way :
    My problem is :Even delete the file extlinux.conf,the xavier always could reboot.it seems like no effect on boot.
    2.when i used the A/B update:
    the dtb is not updated.Here is the boot log and update log.

can you help me to solve it?
nv_update_engine.log (2.4 KB) boot.log (111.0 KB)

2

the jetpack version is 4.2.2.

4

hello 544485316,

Xavier using CBoot to load device tree,
there’s an update in the latest release, it could choose the device tree from kernel-dtb partition of from the FDT entry.
suggest you should moving to the latest JetPack release, i.e. JetPack-4.4 / l4t-r32.4.3

please also check developer guide,
you may refer to CBoot session and check [Kernel Boot Sequence Using extlinux.conf] for more details.
thanks

5

Hi Herry
thanks for reply,i’ll chose 4.4 for a try.
but another question,why nv_update_engine do not work?Can you check the log i upload and give me some sugestion?

6

hello 544485316,

please moving to JetPack-4.4, you may using extlinux.conf to have selection of device tree sources.

you may check Bootloader Redundancy chapter,
it’ll switch to another unused slots if the current slot is corrupted; it’s by default automatically maintains the same Bootloader image on both Bootloader slots.
according to your messages below, it’s actually load kernel-dtb…

[0005.911] I> Loading kernel-dtb from partition ...
[0005.911] I> A/B: bin_type (38) slot 1
[0005.912] I> Loading partition kernel-dtb_b at 0x90000000 from device(0x1)
[0005.917] I> T19x: Authenticate kernel-dtb (bin_type: 38), max size 0x400000