Error on tfm_builtin_key_loader after flash and nrf5340 custom board flashing

RE: Error on tfm_builtin_key_loader after flash and nrf5340 custom board flashing

Nyameaama — Tue, 30 Jul 2024 07:35:26 GMT

Hi Amanda, I fixed the problem by examining the flash sectors and what I was actually flashing. The problem has to do with my sysbuild implementation. Something in this config file is causing the problem:

sysbuild.cmake:

#
# Copyright (c) 2023 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# Add net_core project
ExternalZephyrProject_Add(
    APPLICATION net_core
    SOURCE_DIR ${APP_DIR}/net_core
    BOARD atreides_nrf5340_cpunet
  )
set_property(GLOBAL APPEND PROPERTY PM_DOMAINS CPUNET)
set_property(GLOBAL APPEND PROPERTY PM_CPUNET_IMAGES net_core)
set_property(GLOBAL PROPERTY DOMAIN_APP_CPUNET net_core)
set(CPUNET_PM_DOMAIN_DYNAMIC_PARTITION net_core CACHE INTERNAL "")

# Add a dependency so that the net_core sample will be built and flashed first
add_dependencies(base-firmware-V2 net_core)
# Add dependency so that the net_core image is flashed first.
sysbuild_add_dependencies(FLASH net_core)

I just put this file in a different folder and essentially removed it from the build so now I am not independently programming the network core anymore. This issue set me back andI had to continue working on the actual product code so I stopped trying to figure out what in this file makes programming go nuclear. If you have any thoughts I'd be glad to know but in essence the issue is "fixed". Thanks

RE: Error on tfm_builtin_key_loader after flash and nrf5340 custom board flashing

Amanda Hsieh — Mon, 29 Jul 2024 19:34:28 GMT

Could you check CONFIG_NRF_APPROTECT_USE_UICR got enabled in the .config under build/zephyr and build/hci_ipc/zephyr?

I think you could compare the board files of nrf5340dk with your custom board. maybe zephyr.dts and .config under build/zephyr and build/hci_ipc/zephyr might have clues.

RE: Error on tfm_builtin_key_loader after flash and nrf5340 custom board flashing

Nyameaama — Sat, 27 Jul 2024 16:58:40 GMT

I also recently tried programming an unopened and untouched backup unit of my custom PCB thinking maybe I did something to the board I was currently using. The same ap protect error persists and when I use the method to program with (nrf5340_cpuapp_ns), I get the Trusted-Firmware-M problem. This was leading me to believe maybe there is something wrong with my build and the firmware I’m flashing right?

However when I disconnect the SWD and program the nrf5340dk with the same firmware as my custom board it programs with zero issues and I am able to debug like normal. No ap protect issues. The firmware I am flashing to the dk is not using the dk board files by the way. It’s using my custom board files so that looks like it’s eliminating the possibility of board file problems.

So I am quite lost. Please also note I was programming the custom board just fine a few days ago. It did not come out of manufacturing with this issue.

RE: Error on tfm_builtin_key_loader after flash and nrf5340 custom board flashing

Nyameaama — Sat, 27 Jul 2024 04:33:28 GMT

Hi Amanda, when I program only the application core without the network core with the (nrf5340_cpuapp) build configuration, it flashes just fine. However, the cores become protected once again so I am unable to debug. My application code also does not work (I am able to tell because the board is connected to stepper motor and has a stepper motor driver on the PCB so when the program is functioning properly the stepper is energized with a hum and does not rotate freely. This does not happen in this case)

RE: Error on tfm_builtin_key_loader after flash and nrf5340 custom board flashing

Amanda Hsieh — Fri, 26 Jul 2024 19:42:48 GMT

Hi,

[quote user=""]When trying using regular (nrf5340_cpuapp) this does not work at all and it fails when programming the network core no matter what with the same ap protect error.[/quote]

If you don't change the netcore, you can safely just flash only the GENERATED_CP_APPLICATION_merged_domains.hex (only application). Does it help?

Regards,
Amanda H.