RE: Problems updating a read protected device via DFU

Roger Clark — Sat, 15 Jul 2017 00:51:39 GMT

Thanks Bjørn

I'll check the original source code to see if the programmer who wrote it used BPROT.

RE: Problems updating a read protected device via DFU

bjorn-spockeli — Fri, 14 Jul 2017 13:03:29 GMT

Hi Roger,

you are correct, the nrfjprog --pbp only disconnects the Access Port to prevent the CPU registers and memory-mapped addresses from being read back and does not lock the flash. The BPROT peripheral can be used to prevent application code from erasing or writing to protected blocks. However, the block protection is by default not enabled and you need to explicitly enabled it in code. So If you have not enabled this, then you should not have any issues performing an update of the SD+APP+BL.

Best regards

Bjørn