My Custom Board Error

[HHJ]

“Why, after setting up the custom board and writing CONFIG_BOARD="my_custom_board" in prj.conf, do I encounter the errors: message(FATAL_ERROR "command failed with return code: ${ret}") and 4,"message": "Kconfig Language Server cannot start for build 'build/blinky_2'. Try rebuilding or do the pristine build to fix this issue."?”

[mackz]

I do not think you should assign CONFIG_BOARD in your prj.conf

If you look at the board folder for thingy91_nrf9160 you can see that in Kconfig.board they have:

if SOC_NRF9160_SICA

config BOARD_THINGY91_NRF9160
	bool "nRF9160 THINGY91"

config BOARD_THINGY91_NRF9160_NS
	bool "nRF9160 THINGY91 non-secure"

and in Kconfig.defconfig they have:

if BOARD_THINGY91_NRF9160 || BOARD_THINGY91_NRF9160_NS

config BOARD
	default "thingy91_nrf9160"

try to do it like that instead. 

[HHJ]

“Can you tell me in detail based on my picture whether both kconfig.defconfig and kconfig.nrf5340dk need to be modified or only one of them, and how should I write the code for the changes?”

[mackz]

https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-3-adding-custom-board-support/topic/creating-board-files/

You should follow this guide when creating your custom board, it explains what files you should copy and explains what should be in them.