doesn't seem to be a way to use the flash with stm32n6dk

[brendena]

If you use the flash_stream option

It seems to be this way because the stm32n6 uses external flash and the way its defined in the dts causes problems? The goal is to get sample samples/subsys/mgmt/mcumgr/smp_svr$ working

	mx66uw1g45g: ospi-nor-flash@0 {
		compatible = "st,stm32-xspi-nor";
		reg = <0>;
		size = <DT_SIZE_M(1024)>; // 1Gbits 
		ospi-max-frequency = <DT_FREQ_M(50)>;
		spi-bus-width = <XSPI_OCTO_MODE>;
		data-rate = <XSPI_DTR_TRANSFER>;
		four-byte-opcodes;
		status = "okay";

		#address-cells = <1>;
		#size-cells = <1>;
		ranges = <0x0 0x70000000 DT_SIZE_M(128)>;

#############this seems to be the problem
############# that there's a ext_flash container inside the ospi-nor-flash??
		ext_flash: ext-flash@0 {
			compatible = "soc-nv-flash";
			reg = <0x0 DT_SIZE_M(128)>;
			write-block-size = <1>;
			erase-block-size = <DT_SIZE_K(4)>;

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

				boot_partition: partition@0 {
					label = "mcuboot";
					reg = <0x00000000 DT_SIZE_K(64)>;
				};

				slot0_partition: partition@10000 {
					label = "image-0";
					reg = <0x10000 DT_SIZE_K(1536)>;
				};

				slot1_partition: partition@210000 {
					label = "image-1";
					reg = <0x210000 DT_SIZE_K(1536)>;
				};

				storage_partition: partition@410000 {
					label = "storage";
					reg = <0x410000 DT_SIZE_K(64)>;
				};
			};
		};

The nucleo version of the board doesn't do this. But it also doesn't use MCUboot, which if you format the dk version of the board will cause problems with.

&xspi2 {
	pinctrl-0 = <&xspim_p2_ncs1_pn1 &xspim_p2_dqs0_pn0 &xspim_p2_clk_pn6
		     &xspim_p2_io0_pn2 &xspim_p2_io1_pn3 &xspim_p2_io2_pn4
		     &xspim_p2_io3_pn5 &xspim_p2_io4_pn8 &xspim_p2_io5_pn9
		     &xspim_p2_io6_pn10 &xspim_p2_io7_pn11>;
	pinctrl-names = "default";
	clocks = <&rcc STM32_CLOCK(AHB5, 12)>,
		 <&rcc STM32_SRC_HCLK5 XSPI2_SEL(0)>,
		 <&rcc STM32_CLOCK(AHB5, 13)>;
	status = "okay";

	mx25um51245g: ospi-nor-flash@0 {
		compatible = "st,stm32-xspi-nor";
		reg = <0>;
		size = <DT_SIZE_M(512)>; /* 512 Mbits */
		ospi-max-frequency = <DT_FREQ_M(200)>;
		spi-bus-width = <XSPI_OCTO_MODE>;
		data-rate = <XSPI_DTR_TRANSFER>;
		four-byte-opcodes;
		status = "okay";

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

			storage_partition: partition@3ff0000 {
				label = "storage";
				/*
				 * Prevent access to the last 32bytes of the memory-mapped device
				 * Issue described in the STM32N6xxxx errata sheet ES0620 Rev 1:
				 * 2.4.5 Deadlock or data corruption when DQS is enabled and the
				 * wrap request includes the last address of the memory
				 */
				reg = <0x3ff0000 (DT_SIZE_K(64) - 32)>;
			};
		};
	};
};