boards: arm: stm32h7b3 disco kit for XiP on external octoflash

Define the Device tree of the stm32h7b3i_dk disco board
to access the external NOR octo-flash in MemoryMapped mode
for XiP
Set openocd runner for debugging.

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

Author: FRASTM

boards/arm/stm32h7b3i_dk/stm32h7b3i_dk.dts

@@ -242,6 +242,35 @@
 	def-back-color-blue = <0xFF>;
 };
 
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x00000000 DT_SIZE_K(64)>;
+			read-only;
+		};
+
+		/*
+		 * The flash starting at offset 0x10000 and ending at
+		 * offset 0x1ffff is reserved for use by the application.
+		 */
+
+		slot0_partition: partition@10000 {
+			label = "image-0";
+			reg = <0x00010000 DT_SIZE_K(800)>;
+		};
+
+		scratch_partition: partition@f8000 {
+			label = "image-scratch";
+			reg = <0x000F8000 DT_SIZE_K(16)>;
+		};
+	};
+};
+
 &octospi1 {
 	pinctrl-0 = <&octospim_p1_clk_pb2 &octospim_p1_ncs_pg6
 		     &octospim_p1_io0_pd11 &octospim_p1_io1_pf9
@@ -253,11 +282,10 @@
 
 	status = "okay";
 
-	mx25lm51245: ospi-nor-flash@0 {
+	mx25lm51245: ospi-nor-flash@90000000 {
 		compatible = "st,stm32-ospi-nor";
-		reg = <0>;
+		reg = <0x90000000 DT_SIZE_M(64)>; /* 512 Megabits */
 		ospi-max-frequency = <DT_FREQ_M(50)>;
-		size = <DT_SIZE_M(512)>; /* 512 Megabits */
 		spi-bus-width = <OSPI_OPI_MODE>;
 		data-rate = <OSPI_DTR_TRANSFER>;
 		status = "okay";
@@ -267,9 +295,10 @@
 			   #address-cells = <1>;
 			   #size-cells = <1>;
 
-			   partition@0 {
-			       label = "nor";
-			       reg = <0x00000000 DT_SIZE_M(4)>;
+			   /* put image at offset 0 in slot1 */
+			   slot1_partition:partition@0 {
+			       label = "image-1";
+			       reg = <0x00000000 DT_SIZE_K(800)>;
 			   };
 		};
 	};

boards/arm/stm32h7b3i_dk/support/openocd.cfg

@@ -20,3 +20,10 @@ set CORE_RESET 0
 
 source [find target/stm32h7x.cfg]
 
+# Due to the use of connect_assert_srst, running gdb requires
+# to reset halt just after openocd init.
+rename init old_init
+proc init {} {
+        old_init
+        reset halt
+}