RE: Zephyr retention module not working; can't read back

Phobios — Tue, 12 Nov 2024 14:28:32 GMT

Thanks for the examples. I've altered the device tree to this and now it's working:

	sram@2003FC00 {
		compatible = "zephyr,memory-region", "mmio-sram";
		reg = <0x2003FC00 DT_SIZE_K(1)>;
		zephyr,memory-region = "RetainedMem";
		status = "okay";

		retention0: retainedmem {
			compatible = "zephyr,retained-ram";
			status = "okay";
		};
	};
};

So I've removed the address-cells and size-cells and also the reg which apparently gives the size of the subarea and it works. I don't know why the other device tree overflay was not working, maybe it only works with 2 or more sections and one section may not be divided into one subarea like i did.

Anyway, thanks.

Phobios

RE: Zephyr retention module not working; can't read back

Amanda Hsieh — Tue, 12 Nov 2024 13:49:06 GMT

Hi,

Please look at this retained_mem sample and the boards configs & overlay.

Regards,
Amanda H.