boards: arm: stm32h735 disco kit for XiP on external octoflash

Define the Device tree of the stm32h735g_disco board
to access the external NOR octo-flash in MemoryMapped mode
for XiP

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

boards/arm/stm32h735g_disco/stm32h735g_disco.dts

@@ -19,6 +19,9 @@
 		zephyr,shell-uart = &usart3;
 		zephyr,sram = &sram0;
 		zephyr,flash = &flash0;
+		zephyr,flash-controller = &mx25lm51245;
+		zephyr,code-partition = &slot1_partition;
+
 	};
 
 	leds {
@@ -143,6 +146,28 @@
 	cd-gpios = <&gpiof 5 GPIO_ACTIVE_LOW>;
 };
 
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x00000000 DT_SIZE_K(64)>;
+		};
+			/* Set 2KB of storage at the end of first 1MB flash */
+		slot0_partition: partition@10000 {
+			label = "image-0";
+			reg = <0x00010000 DT_SIZE_K(416)>;
+		};
+		storage_partition: partition@ff800 {
+			label = "storage";
+			reg = <0x000ff800 DT_SIZE_K(2)>;
+		};
+	};
+};
+
 &octospi1 {
 	pinctrl-0 = <&octospim_p1_clk_pf10 &octospim_p1_ncs_pg6
 		     &octospim_p1_io0_pd11 &octospim_p1_io1_pd12
@@ -156,9 +181,8 @@
 
 	mx25lm51245: ospi-nor-flash@0 {
 		compatible = "st,stm32-ospi-nor";
-		reg = <0>;
+		reg = <0x90000000 DT_SIZE_M(64)>; /* 512 Mbits */
 		ospi-max-frequency = <DT_FREQ_M(50)>;
-		size = <DT_SIZE_M(512)>; /* 64 MBytes */
 		spi-bus-width = <OSPI_OPI_MODE>;
 		data-rate = <OSPI_DTR_TRANSFER>;
 		status = "okay";
@@ -168,9 +192,10 @@
 			   #address-cells = <1>;
 			   #size-cells = <1>;
 
-			   partition@0 {
+			   /* put image at offset 0 in slot1 */
+			   slot1_partition:partition@0 {
 			       label = "nor";
-			       reg = <0x00000000 DT_SIZE_M(4)>;
+			       reg = <0x00000000 DT_SIZE_M(32)>;
 			   };
 		};
 	};