---

Это правка dts     
   chosen {
                zephyr,flash = &sdram_code; 
                zephyr,sram = &sdram_data;
        };

        sdram_code: memory@80000000 {
                device_type = "memory";
                reg = <0x80000000 DT_SIZE_M(16)>;
        };

        sdram_data: memory@81000000 {
                device_type = "memory";
                reg = <0x81000000 DT_SIZE_M(16)>;
        };   

Это по умолчанию:
zephyr,flash = &w25q32jvwj0;
zephyr,sram = &sdram0;


	sdram0: memory@80000000 {
		/* Micron MT48LC16M16A2B4-6AIT:G */
		device_type = "memory";
		reg = <0x80000000 DT_SIZE_M(32)>;
	};

&flexspi {
	status = "okay";
	reg = <0x402a8000 0x4000>, <0x60000000 DT_SIZE_M(4)>;
	/* 32 megabit internal flash present on chip */
	w25q32jvwj0: w25q32jvwj@0 {
		compatible = "nxp,imx-flexspi-nor";
		size = <DT_SIZE_M(4 * 8)>;
		reg = <0>;
		spi-max-frequency = <133000000>;
		status = "okay";
		jedec-id = [ef 40 16];
		erase-block-size = <DT_SIZE_K(4)>;
		write-block-size = <1>;
	};
};