[U-Boot-Users] when to call the WATCHDOG_RESET()
Hi All, In my device initialization and other routines, how do I decide exactly when to call WATCHDOG_RESET ()?
Thanks & Regards Apoorv Sangal
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In message 3D9FDCA910DD4445896A0BE5ECF009D4017EB335@bla.satyam.com you wrote:
In my device initialization and other routines, how do I decide exactly when to call WATCHDOG_RESET ()?
Estimate the time needed to run your code, and look up the minimum watchdog trigger time in your hardware specs. Than make sure you trigger the WD often enough.
Usually, there only few places where this is critical - check for those parts of the code before the timer interrupt is running, and after it for parts where interrupts get disabled (like when uncompressing a Linux kernel image).
Most systems behave harmless, but there are a few nasty ones like the LWMON board with a watchdog that needs triggering after a maximum of 80 millisec...
Best regards,
Wolfgang Denk
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Apoorv_Sangal -
Wolfgang Denk