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How to enable watchdog on iMX7

Question asked by John Watlington on Apr 26, 2017
Latest reply on Feb 1, 2018 by Yuri Muhin

We are trying to get the watchdog to work on the iMX7D.

While the Sabre eval board uses an external connection between WDOG_RESET_B_DEB and POR_B, we need that GPIO for other reasons, don't use the POR signal elsewhere, and don't want to pay for the external schottky diode.

In the SRC section of the reference manual, it strongly implies that the SRC is wired internally to the WDOG timers (e.g. Fig 6.9 and the MASK fields of SRC_A7RCR0 and SRC_M4RCR).

We have not, however, been able to properly enable the watchdog.

We are running uBoot and Linux from the 4.1.15 2.0.0GA BSP.


Can you confirm that it is possible to use the watchdog timeouts to reboot the iMX7D SoC without external wiring to the POR_B signal ?  And provide suggestions as to enabling this ?



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