About Flashing firmware of nrf5340 with nrfjprog.exe

RE: About Flashing firmware of nrf5340 with nrfjprog.exe

mingjkl — Wed, 13 Apr 2022 00:21:13 GMT

Thank you very much for your patient and professional reply. I have understood it. Thank you.

RE: About Flashing firmware of nrf5340 with nrfjprog.exe

Marte Myrvold — Tue, 12 Apr 2022 09:25:34 GMT

Hi,

West flash does use nrfjprog to program the nRF5340, but the command is not equivalent with nrfjprog --program as it does some more handling before running nrfjprog --program. So it is possible to use west flash to flash a merged hex file, as you can see in Working with nRF5340 DK » Multi-image builds and under Multi-image build in Working with nRF5340 DK » Building and programming a sample.

but when you use it to program multi-image builds to the different cores it actually runs nrfjprog --program for each core just as in my previous reply.

When you run west commands you are actually executing scripts located in zephy/scripts/west_commands. These will parse information and use this information when running nrfjprog --program. However, when the device family is NRF53 it will do some extra handling before creating and running nrfjprog --program in order to handle the two cores. What it does is actually to generate two new hex files, one for each core, based on the input hex file and then flash them individually. So it flashes both cores separately just as you would do yourself with nrfjprog. If you are curious and want to know more about this you can look at the function program_hex_nrf53() in west_commands/runners/nrfjprog.py.

Best regards,

Marte

RE: About Flashing firmware of nrf5340 with nrfjprog.exe

mingjkl — Tue, 12 Apr 2022 00:35:32 GMT

Flash using West is also completed by calling nrfjprog, so the firmware flashing of nrf5340 must be carried out separately from two cores, and one merge hex cannot be used for flash at one time. Is that right？

RE: About Flashing firmware of nrf5340 with nrfjprog.exe

Marte Myrvold — Mon, 11 Apr 2022 11:59:24 GMT

Hi,

You cannot use nrfjprog to program multi-image builds for different cores. You must either use west, or you must program the cores separately with nrfjprog:

nrfjprog -f NRF53 --coprocessor CP_NETWORK --program zephyr/zephyr.hex --chiperase

nrfjprog -f NRF53 --program zephyr/zephyr.hex --chiperase

Best regards,

Marte