settings/fcb_init/prj.conf

CONFIG_ZTEST=y
CONFIG_STDOUT_CONSOLE=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y
CONFIG_ARM_MPU=n
CONFIG_FCB=y

CONFIG_SETTINGS=y
CONFIG_SETTINGS_RUNTIME=y
CONFIG_SETTINGS_FCB=y

CONFIG_REBOOT=y