MCU_VARIANT = nrf5340 CFLAGS += -DNRF5340_XXAA -DNRF5340_XXAA_APPLICATION # enable max3421 host driver for this board MAX3421_HOST = 1 # caused by void SystemStoreFICRNS() (without void) in system_nrf5340_application.c CFLAGS += -Wno-error=strict-prototypes # flash using jlink JLINK_DEVICE = nrf5340_xxaa_app flash: flash-jlink