Application wont start on new MCU

[Adam W]

Hi, I have custom board with nrf54l15. Im using sdk 2.9.1 and nRF54L15-DK as debugger/flasher. Im able to flash firmware correctly using SWD, or do nrfjprog --recover, but the application itself wont start. Debugger is stuck at:

I used nrfjprog --readregs and got:

I tried to flash same firmware (blinky example) but build for nRF54L15-DK and debugger is getting to:

but after that nothing happens. Im not sure what why mcu wont boot application. I assume its not hardware related since mcu is flashing correctly. I would appreciate some guidence on where to start with this issue, Thank you.

im also including my zephyr.dts file and .config

24173.zephyr.dts

config.config

[Kazi Afroza Sultana]

Hello,

Did the sample work (seeing output on output terminal) on DK and not on your custom board?

[Adam W]

Yes, sample works on DK

[Kazi Afroza Sultana]

If I understand correctly, your blinky sample is not showing any output when you try to run it on custom board. 

Do you have any low frequency external crystal (LFXO) on your custom board? If you have then it needs to connect with correct capacitors.

Otherwise, you can use internal RC oscillator by setting this configuration

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y 

[Adam W]

I Added CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y to prj.conf and the application is running. Thank you! However, connecting with debugger fail with following error in file cbprintf_packaged.c:

[Kazi Afroza Sultana]

Hello,

Adding this CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y made the sample wrks on output board and made the output ogf bøinky sample on termina, proves the debug error was related to low frequency clock as board doesnt have any LFXO.

I am not sure about the new error, maybe you can set all the configuration of RC (calibration, accuracy and ensuring the calibration is always on) and try the process again.

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y
CONFIG_CLOCK_CONTROL_NRF_CALIBRATION_LF_ALWAYS_ON=y