boards: st: stm32h573i_dk: introduce soc-nv-flash node

Introduce a 'soc-nv-flash' node in the stm32h573i_dk board DTS file
to define the external Flash memory parameters used for MCUBoot
integration. This way BOOT_MAX_IMG_SECTORS_AUTO can be used to
automatically calculate the maximum number of image sectors based
on the actual external Flash configuration.

Signed-off-by: Tim Pambor <[email protected]>

Author: tpambor

boards/st/stm32h573i_dk/Kconfig.sysbuild

@@ -0,0 +1,18 @@
+# SPDX-FileCopyrightText: Copyright The Zephyr Project Contributors
+# SPDX-License-Identifier: Apache-2.0
+
+choice BOOTLOADER
+	default BOOTLOADER_MCUBOOT
+endchoice
+
+choice BOOT_SIGNATURE_TYPE
+	default BOOT_SIGNATURE_TYPE_NONE
+endchoice
+
+if BOARD_STM32H573I_DK_STM32H573XX_EXT_FLASH_APP
+
+choice MCUBOOT_MODE
+	default MCUBOOT_MODE_DIRECT_XIP
+endchoice
+
+endif # BOARD_STM32H573I_DK_STM32H573XX_EXT_FLASH_APP

boards/st/stm32h573i_dk/stm32h573i_dk-common.dtsi

@@ -76,12 +76,12 @@
 		volt-sensor1 = &vbat;
 	};
 
-	ext_memory: memory@90000000 {
+	ext_flash_mem: memory@90000000 {
 		compatible = "zephyr,memory-region";
 		reg = <0x90000000 DT_SIZE_M(64)>;
-		zephyr,memory-region = "EXTMEM";
-		/* The ATTR_MPU_EXTMEM attribut causing a MPU FAULT */
-		zephyr,memory-attr = <DT_MEM_ARM(ATTR_MPU_IO)>;
+		zephyr,memory-region = "EXT_FLASH";
+		/* DT_MEM_ARM_MPU_EXTMEM and DT_MEM_ARM_MPU_FLASH cause MPU issues */
+		zephyr,memory-attr = <DT_MEM_ARM_MPU_IO>;
 	};
 
 	lvgl_pointer {
@@ -354,7 +354,7 @@
 
 	status = "okay";
 
-	mx25lm51245: ospi-nor-flash@0 {
+	ext_flash_ctrl: xspi-flash-controller@0 {
 		compatible = "st,stm32-xspi-nor";
 		reg = <0>;
 		size = <DT_SIZE_M(512)>; /* 512 Mbits */
@@ -363,6 +363,17 @@
 		data-rate = <XSPI_DTR_TRANSFER>;
 		four-byte-opcodes;
 		status = "okay";
+
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x0 0x90000000 DT_SIZE_M(64)>; /* Ext Flash mem-mapped to 0x90000000 */
+
+		ext_flash: mx25lm51245: ext-flash@0 {
+			compatible = "soc-nv-flash";
+			reg = <0x0 DT_SIZE_M(64)>;
+			write-block-size = <1>;
+			erase-block-size = <DT_SIZE_K(64)>;
+		};
 	};
 };
 

boards/st/stm32h573i_dk/stm32h573i_dk.dts

@@ -48,7 +48,7 @@
 	};
 };
 
-&mx25lm51245 {
+&ext_flash {
 	partitions {
 		compatible = "fixed-partitions";
 		#address-cells = <1>;

boards/st/stm32h573i_dk/stm32h573i_dk_stm32h573xx_ext_flash_app.dts

@@ -12,8 +12,8 @@
 	compatible = "st,stm32h573i-dk";
 
 	chosen {
-		zephyr,flash = &mx25lm51245;
-		zephyr,flash-controller = &mx25lm51245;
+		zephyr,flash = &ext_flash;
+		zephyr,flash-controller = &ext_flash_ctrl;
 		zephyr,code-partition = &slot0_partition;
 	};
 };
@@ -37,7 +37,7 @@
 	};
 };
 
-&mx25lm51245 {
+&ext_flash {
 	partitions {
 		compatible = "fixed-partitions";
 		#address-cells = <1>;