Warnings that UICR has not been erased just after I erase it

[Scott Althoff]

I called these command:

nrfjprog -f NRF52 --eraseuicr
nrfjprog -f NRF52 --program app.hex --sectorerase

During the eraseuicr I see:

Erasing UICR flash area.
Applying system reset.

During the program I see:

WARNING: A UICR write operation has been requested but UICR has not been
WARNING: erased. Please verify that the result is correct.

Is there a way to properly erase the UICR so I don't get these warnings?

[endnode]

I don't know if that is the right way but I use nrfjprog -f NRF52 --recover in my scripts, it erases everything including UICR so I'm good to go with programming the entire chip from scratch. Also note that there is --sectoranduicrerase switch for --program command in the latest nrfjprog version, that's probably what you want.

[Hung Bui]

Hi Scott, It is a bug in nrfjprog. Seems like --sectorerase can't erase UICR. And it result in the warning you saw. But if you do a --eraseuicr prior, you should be fine.

[Scott Althoff]

I starting using --sectoranduicrerase. Thanks for the help!

[Hung Bui]

Yeah I missed that. Good to know :)