Making cpu reset cause available from U-Boot to Linux

colinhelliwell — Wed, 27 Dec 2017 16:15:05 GMT

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?

Thanks

Re: Making cpu reset cause available from U-Boot to Linux

igorpadykov — Thu, 28 Dec 2017 05:21:49 GMT

Hi colinhelliwell

seems you are right, in general one can save that reset info in some
of SRC_GPR registers and use in linux.

Best regards
igor