boot: zephyr: boards config of the stm32h7s78 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

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

Author: FRASTM

boot/zephyr/boards/stm32h7s78_dk.conf

@@ -0,0 +1,2 @@
+CONFIG_BOOT_DIRECT_XIP=y
+CONFIG_STM32_MEMMAP=y

boot/zephyr/boards/stm32h7s78_dk.overlay

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2024 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		zephyr,flash = &flash0;
+		zephyr,code-partition = &boot_partition;
+	};
+};