boot: zephyr: boards config of the stm32 disco kit

Define the stm32 disco board configuration to set
the STM32 XIP mode that will enable the MemoryMapped mode.
See Kconfig of the stm32 soc. Choose the mcu_boot partition
where to build ../bootloader/mcuboot/boot/zephyr
The zephyr, chosen zephyr,flash = &flash0; is in the board dts.
The zephyr,code-partition = &boot_partition; is given by the app.overlay

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

Author: FRASTM

boot/zephyr/boards/b_u585i_iot02a.conf

@@ -0,0 +1,4 @@
+CONFIG_BOOT_DIRECT_XIP=y
+CONFIG_STM32_MEMMAP=y
+CONFIG_BOOT_MAX_IMG_SECTORS_AUTO=n
+CONFIG_BOOT_MAX_IMG_SECTORS=1024

boot/zephyr/boards/b_u585i_iot02a.overlay

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2025 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * Define the device, controller and partition to be the external memory
+ * for running the application in external NOR from MCUboot
+ */
+
+/delete-node/ &slot0_partition;
+/delete-node/ &slot1_partition;
+/delete-node/ &scratch_partition;
+/delete-node/ &storage_partition;
+
+&mx25lm51245 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		slot0_partition: partition@0 {
+			label = "image-0";
+			reg = <0x00000000 DT_SIZE_K(416)>;
+		};
+		slot1_partition: partition@68000 {
+			label = "image-1";
+			reg = <0x00068000 DT_SIZE_K(416)>;
+		};
+		scratch_partition: partition@d0000 {
+			label = "image-scratch";
+			reg = <0x000d00000 DT_SIZE_K(64)>;
+		};
+		storage_partition: partition@e0000 {
+			label = "storage";
+			reg = <0x000e0000 DT_SIZE_K(64)>;
+		};	};
+};
+

boot/zephyr/boards/stm32h750b_dk.conf

@@ -0,0 +1,4 @@
+CONFIG_BOOT_DIRECT_XIP=y
+CONFIG_STM32_MEMMAP=y
+CONFIG_BOOT_MAX_IMG_SECTORS_AUTO=n
+CONFIG_BOOT_MAX_IMG_SECTORS=256