samples/drivers/flash_shell/boards/cy8cproto_063_ble.overlay

&flash0 {
	partitions {
		#address-cells = <1>;
		#size-cells = <1>;
		compatible = "fixed-partitions";

		/* Set 3Kb of storage at the end of the of 1Mb flash 0 */
		storage_partition: partition@ff400 {
			label = "storage";
			reg = <0xff400 DT_SIZE_K(3)>;
		};
	};
};