kconfig.defconfig file purpose

[mexco]

I saw board directory in zephyr. I found Kconfig, Kconfig.board and Kconfig.deconfig files. What is purpose all these files ? ( see board files of nRF5340DK or thingy53 )

[mexco]

Hello, After having a long study, I found that defconfig is used to set default configurations of on board SOC peripherals. 

[Amanda Hsieh]

Hi, 
See https://docs.zephyrproject.org/latest/hardware/porting/board_porting.html:

Kconfig.board, Kconfig.defconfig, plank_defconfig: software configuration in Configuration System (Kconfig) formats. This provides default settings for software features and peripheral drivers.

Regards,
Amanda H.