AM625: How to check whether system is reboot by watchdog ?

LEE INJAE

Intellectual 460 points

Part Number: AM625

Tool/software:

Dear TI.

It seems that system reboot by watchdog when I execute "echo 1 > /dev/watchdog"

From which register bit can I check if the system reboot by watchdog ?

Jace

8 months ago

0 Bin Liu 8 months ago

TI__Guru**** 171801 points

Hi Jace,

You can check register CFG0_RST_SRC (address 0x43018178).

0 LEE INJAE 8 months ago in reply to Bin Liu

Intellectual 460 points

Hi Liu

After watchdog reser, it is 0xC0000000. But in TRM these bits are not WDT, but ESM errors.

Which bit is watchdog ?

Jace

+1 Bin Liu 8 months ago in reply to LEE INJAE

TI__Guru**** 171801 points

Hi Jace,

This is expected.

On AM62x devices, the WDT doesn't directly trigger SoC reset. The WDT timeout event is routed to ESM and ESM will trigger the SoC reset. So this "ESM errors" bit means the device is reset by WDT.

0 LEE INJAE 8 months ago in reply to Bin Liu

Intellectual 460 points

Hi Liu

Thank you for the information.

Jace

0 LEE INJAE 8 months ago in reply to LEE INJAE

Intellectual 460 points

Hi Liu.

I have one question.

Could you let me know how to clear these error bits ?

(0x43018178 : 0xC0000000)

Jace

0 Bin Liu 8 months ago in reply to LEE INJAE

TI__Guru**** 171801 points

I believe write 0 to this register will clear it.

0 LEE INJAE 8 months ago in reply to Bin Liu

Intellectual 460 points

Hi Liu.

I should write 1 for each bit at MCU_MMR0_RST_SRC

Jace

+1 Bin Liu 8 months ago in reply to LEE INJAE

TI__Guru**** 171801 points

Sorry, you are right, I just checked the TRM, it is write-1-to-clear.

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AM625: How to check whether system is reboot by watchdog ?