diff --git a/boot/zephyr/boards/nucleo_h7s3l8.conf b/boot/zephyr/boards/nucleo_h7s3l8.conf
new file mode 100644
index 0000000000..93013ed9a1
--- /dev/null
+++ b/boot/zephyr/boards/nucleo_h7s3l8.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=4096
diff --git a/boot/zephyr/boards/stm32h573i_dk.conf b/boot/zephyr/boards/stm32h573i_dk.conf
new file mode 100644
index 0000000000..93013ed9a1
--- /dev/null
+++ b/boot/zephyr/boards/stm32h573i_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=4096
diff --git a/boot/zephyr/boards/stm32h7s78_dk.conf b/boot/zephyr/boards/stm32h7s78_dk.conf
new file mode 100644
index 0000000000..93013ed9a1
--- /dev/null
+++ b/boot/zephyr/boards/stm32h7s78_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=4096
diff --git a/boot/zephyr/flash_map_extended.c b/boot/zephyr/flash_map_extended.c
index 6acf76f462..c5afb632bc 100644
--- a/boot/zephyr/flash_map_extended.c
+++ b/boot/zephyr/flash_map_extended.c
@@ -28,11 +28,13 @@ BOOT_LOG_MODULE_DECLARE(mcuboot);
 #define FLASH_DEVICE_NODE DT_INST(0, st_stm32_xspi_nor)
 #define FLASH_DEVICE_BASE DT_REG_ADDR_BY_IDX(DT_INST_PARENT(0), 1)
 #elif DT_NODE_HAS_STATUS(DT_INST(0, st_stm32_ospi_nor), okay)
+#define DT_DRV_COMPAT st_stm32_ospi_nor
 #define FLASH_DEVICE_NODE DT_INST(0, st_stm32_ospi_nor)
-#define FLASH_DEVICE_BASE DT_REG_ADDR(DT_INST(0, st_stm32_ospi_nor))
+#define FLASH_DEVICE_BASE DT_REG_ADDR_BY_IDX(DT_INST_PARENT(0), 1)
 #elif DT_NODE_HAS_STATUS(DT_INST(0, st_stm32_qspi_nor), okay)
+#define DT_DRV_COMPAT st_stm32_qspi_nor
 #define FLASH_DEVICE_NODE DT_INST(0, st_stm32_qspi_nor)
-#define FLASH_DEVICE_BASE DT_REG_ADDR(DT_INST(0, st_stm32_qspi_nor))
+#define FLASH_DEVICE_BASE DT_REG_ADDR_BY_IDX(DT_INST_PARENT(0), 1)
 #else
 #error "FLASH_DEVICE_NODE could not be determined"
 #endif