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Board Lock-Up on Watchdog Reset

Question asked by Paul DeMetrotion on Feb 19, 2019
Latest reply on Feb 20, 2019 by Paul DeMetrotion

Developed a custom board based on the i.MX6Q. We are using the internal watchdog timer and the watchdog reset works fine when we perform a reboot command.The WDOG_B signal is being routed to the POR signal of the i.MX6 device.

 

We are running a watchdog timer test and the board will periodically lock up after the watchdog expires and generates an internal reset signal. It appears to be locking up early in u-boot. 

 

The behavior seems very erratic and is affected by odd functions like:

  1. DHCP in progress or not

  2. Length of timeout - 5 seconds will not lock up while 60 seconds will

 

I know this is very vague but looking for any ideas at this point.

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