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Making cpu reset cause available from U-Boot to Linux

Question asked by colinhelliwell on Dec 27, 2017
Latest reply on Dec 27, 2017 by igorpadykov

I'd like the system's reset cause (por, watchdog etc) to be available to Linux - it's shown in the u-boot debug e.g.

"Reset cause: POR"

I've only found a few references to this in searching, and it seems that u-boot clears the register after reading?

Has anyone done any modifications to preserve this, and then been able to read it from the OS?