Enabling PMIC-WDT on AGX Xavier evaluation board

Autonomous Machines Jetson & Embedded Systems Jetson AGX Xavier
1

Hi,
I’m using an AGX Xavier evaluation board, and I’m trying to enable PMIC-WDT using the same guidelines described in the manual and in this thread: Is it possible to change the PMIC-WDT configs by OTA?(Jetpack4.4).

However, it does not work for me.

First, when I call the flash script it does not appear that the changes I’ve made to p2771-0000.conf.common effect anything. In the flash script output I can see:

./tegraflash.py … --odmdata 0x9190000 …
flash.log (424.6 KB)

After taking a look at the flash script, I noticed that there is a -o option to specify the ODMDATA field so I called it like this:

sudo ./flash.sh -o 0x91a0000 jetson-agx-xavier-devkit mmcblk0p1

and now the script output shows me the correct value:

./tegraflash.py … --odmdata 0x91a0000 …
flash1.log (424.6 KB)

But I still don’t see the message : [0000.203] I> pmic: reset reason (nverc) : 0x2
I opened up a putty session to /dev/ttyUSB3 that is connected to the board’s debug port. I have a bunch of output there but no message that looks like that.

putty.log (81.4 KB)

Please help me understand what I’m doing wrong.

Thanks

2

Jetson AGX is not using p2771-0000.conf.common. That file is for TX2.

3

Hi WayneWWW, thank you for the reply.

I followed this manual: https://docs.nvidia.com/jetson/archives/l4t-archived/l4t-3261/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/kernel_custom.html#wwpID0E0EB0HA

And apparently I falsely assumed it would work for AGX as well… Could you please point me to the correct procedure for enabling the PMIC-WDT for AGX? All my googling lead me to the same pages, describing the same way to it.

5

Hi,

This comment is still true. But you just use the wrong conf file… The board name you are using in flash.sh represents the conf file. For example, “flash.sh jetson-1234 mmcblk0p1” will go to use jetson-1234.conf. Hope you can understand where to find the board conf now.

1.Change ODM data: set ODM data bits 17:16 to 0b10 before flashing in conf file. (This enables PMIC-WDT and disables Tegra-WDT.)

6

Thank you, I understand now, and indeed the flash script output looks correct after I change the right configuration file.

However, I still don’t get the: [0000.203] I> pmic: reset reason (nverc) : 0x2 message in the debug UART.

I’m trying to follow the same guidelines listed in the earlier link:

  1. echo 0 > /sys/module/kernel/parameters/panic - I can only run this as root user, otherwise I get permission denied message, could this be the problem?
  2. cat /dev/watchdog - works fine, I wait for 2 minutes then reset happens.
  3. In the UART debug log I don’t see the correct message, I assume it should appear under the: [0000.341] I> Welcome to MB2(TBoot-BPMP) (version: 00.00.2018.32-mobile-938a8cd8), but I don’t see it anywhere else either.

Here is the putty log of my latest attempt:
putty.log (40.9 KB)

7

Sorry for the late response, have you managed to get issue resolved or still need the support? Thanks

8

Hi kayccc, thank you for responding.

The issue was not solved, but I’ve kind of moved to a different task for now and it may be a while before I can get back to this. If you can, I would appreciate you taking a look at the last comment I made, and if you have an idea please share it, I’ll test it later.

For now, if you want to mark this topic as closed we can.
Thanks!