boards: arm: stm32h735 disco kit move partition to ext flash

Add the OSPI 1 which is an octoSPI connection to a octo NOR flash
mx25lm51245 on the stm32h735 disco kit.
Define the partition on the 64MBytes space of the external flash.
Use the STM32Cube programmer to flash with the corresponding external
loader for XiP mode. Do not mass-erase the internal flash when flashing.
Removing usb_device will avoid test feature for that board.

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

Author: FRASTM

boards/st/stm32h735g_disco/board.cmake

@@ -3,6 +3,9 @@
 
 # keep first
 board_runner_args(stm32cubeprogrammer "--port=swd" "--reset-mode=hw")
+if(CONFIG_STM32_MEMMAP OR (CONFIG_XIP AND CONFIG_BOOTLOADER_MCUBOOT))
+  board_runner_args(stm32cubeprogrammer "--extload=MX25LM51245G_STM32H735G-DK.stldr")
+endif()
 board_runner_args(jlink "--device=STM32H735IG" "--speed=4000")
 board_runner_args(openocd --target-handle=_CHIPNAME.cpu0)
 

boards/st/stm32h735g_disco/stm32h735g_disco.dts

@@ -169,6 +169,29 @@
 	disk-name = "SD";
 };
 
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/*
+		 * Following flash partition is dedicated to the use of b_u585i_iot02a
+		 * with TZEN=0 (so w/o TFM).
+		 * Set the partitions with first MB to make use of the whole Bank1
+		 */
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x00000000 DT_SIZE_K(64)>;
+		};
+
+		storage_partition: partition@f0000 {
+			label = "storage";
+			reg = <0x000f0000 DT_SIZE_K(64)>;
+		};
+	};
+};
+
 &octospi1 {
 	pinctrl-0 = <&octospim_p1_clk_pf10 &octospim_p1_ncs_pg6
 		     &octospim_p1_io0_pd11 &octospim_p1_io1_pd12
@@ -194,11 +217,20 @@
 			#address-cells = <1>;
 			#size-cells = <1>;
 
-			partition@0 {
-				label = "nor";
-				reg = <0x00000000 DT_SIZE_M(4)>;
+			slot0_partition: partition@0 {
+				label = "image-0";
+				reg = <0x00000000 DT_SIZE_K(256)>;
+			};
+			slot1_partition: partition@40000 {
+				label = "image-1";
+				reg = <0x00040000 DT_SIZE_K(256)>;
+			};
+			scratch_partition: partition@e0000 {
+				label = "image-scratch";
+				reg = <0x000e0000 DT_SIZE_K(64)>;
 			};
 		};
+
 	};
 };