How to enable PMIC watchdog at early stage of boot flow, like MB1 or MB2

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Orin
1

Hi, nvidia experts,

our platform: AGX Orin 32G with Jetson Linux 36.4, customer carrier board

I want to know what to do to enable PMIC watchdog at early stage of boot flow, like MB1 or MB2

thanks

4

Hi,
By default it is enable after booting to kernel. Do you have certain error condition that it may be triggered in MB1 or MB2? It should be passing through MB1 and MB2 in a short time and not likely to get stuck in the stage.

5

Hi, DaneLLL,

We don’t have specific condition that the system was stuck by now. Because our products will be deployed at wild place and need to keep running always. So we just want to increase system reliability.

Also the tegra watchdog only be enabled in the systemd service after mount file system, but if the kernel or file system crash, then tegra watchdog won’t work.

So it seems that the only way to implement our requirment is to enable the PMIC WDT as early as possible.

Thanks.

7

Hi,
Please try

  1. Set enable_wdt = <1> in this file:

Linux_for_Tegra/bootloader/tegra234-mb1-bct-misc-common.dtsi

  1. Re-flash the system

And see if it watchdog is enabled in MB1/MB2

9

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