Hi:
I checked the zephyr.dts file, but why are the addresses for flash_controller: flash-controller@39000 and kmu: kmu@39000 the same? I checked the specification and 3900 should be kmu.
nRF9160 Product Specification (nordicsemi.com).
peripheral@40000000 { #address-cells = < 0x1 >; #size-cells = < 0x1 >; ranges = < 0x0 0x40000000 0x10000000 >; flash_controller: flash-controller@39000 { ..... }; ..... kmu: kmu@39000 { compatible = "nordic,nrf-kmu"; reg = < 0x39000 0x1000 >; interrupts = < 0x39 0x1 >; status = "okay"; }; ..... };