https://devzone.nordicsemi.com/f/nordic-q-a/25239/nrf51822-openocd-gdb-open-debuggerI am able to flash/program nrf51822 with openOCD on Raspberry-pi and STLink-v2 but when I invoke Open On-Chip Debugger on telnet to write on UICR register, it don&#39;t give error but when I read it back, i don&#39;t see any change in register value. Openen-USTelligent Community 13Mon, 18 Sep 2017 12:14:43 GMThttps://devzone.nordicsemi.com/thread/99442?ContentTypeID=1Mon, 18 Sep 2017 12:14:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7da4ded3-c565-44fd-be61-79413b8ade9bbjorn-spockeli<p>I believe <a href="https://devzone.nordicsemi.com/question/23842/st-link-nrf51822-and-openocd/">this</a> user managed to flash the UICR registers with OpenOCD.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/99441?ContentTypeID=1Sat, 16 Sep 2017 08:32:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:91aaace8-c27f-4d86-9efc-deb964763812Turbo J<p>UICR is not a normal register, but handled like FLASH. Look into the NVMC chapter in the reference manual.</p> <p>The nrfjprog knows how to handle UICR, but your low level OpenOCD commands only support direct writes - this means you would need to do the unlocking (and erasing) manually via NVMC registers.</p> <p>Alternatively you could put the UICR content into your <code>.elf</code> or <code>.hex</code> file - OpenOCD might be able to write to UICR while flashing the firmware.</p><div style="clear:both;"></div>