device tree

[john.liu]

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";
			};
			.....
		};

[Turbo J]

The peripherial addresses should be either 0x40039000 or 0x50039000 according to the PS.

Note that the driver could ignore this device tree value here if it can infer the address otherwise.

[john.liu]

hi：

I don't understand why the addresses of nvmc and kmu are the same?

[Sigurd Hellesvik]

I do not know for sure if this is why, but the following could make sense:

The KMU keyslots are in the UICR, which is accessed by NVMC.

But for another point:
Why do you need to know why?
Understanding this is usually not required to make a working product, so Im guessing you have an underlying problem