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WDG_B must connect to system reset(POR_B reset) ?

Question asked by JIMMY CHEN on Apr 7, 2016
Latest reply on Dec 12, 2017 by jiu jin hong

Hi Sir,

My customer question is why reboot command will cause WDG_B assertion and why CPU will hang if we do NOT connect WDG_B to system reset?

 

If we set reboot command in Linux 3.14, we can observe that imx6 watch dog WDG_B will assert.

 

If we do not connect WDG_B output to CPU POR_B reset input pin, then the CPU will hang , but We found Linux 3.0.35 is OK(not hang)

 

 

Does it mean the WDG_B “must” connect to system reset to reset whole system even if we do not need watchdog feature?

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