diff --git a/boot/zephyr/Kconfig b/boot/zephyr/Kconfig
index d930141925..19034491ec 100644
--- a/boot/zephyr/Kconfig
+++ b/boot/zephyr/Kconfig
@@ -512,6 +512,22 @@ config BOOT_SHARE_BACKEND_EXTERNAL
 	help
 	  Use a custom user-specified storage.
 
+if BOOT_SHARE_BACKEND_EXTERNAL
+config BOOT_SHARE_BACKEND_EXTERNAL_DATA_BASE
+	hex "Shared memory area base address"
+	depends on BOOT_SHARE_BACKEND_EXTERNAL
+	help
+	  Base address of user-defined memory area shared between
+	  bootloader and runtime firmware.
+
+config BOOT_SHARE_BACKEND_EXTERNAL_DATA_SIZE
+	int "Shared memory area size in bytes"
+	depends on BOOT_SHARE_BACKEND_EXTERNAL
+	help
+	  Size of user-defined memory area shared between
+	  bootloader and runtime firmware.
+endif
+
 endchoice
 
 menuconfig BOOT_SHARE_DATA
diff --git a/boot/zephyr/include/mcuboot_config/mcuboot_config.h b/boot/zephyr/include/mcuboot_config/mcuboot_config.h
index 573155b39a..e678fa1be8 100644
--- a/boot/zephyr/include/mcuboot_config/mcuboot_config.h
+++ b/boot/zephyr/include/mcuboot_config/mcuboot_config.h
@@ -185,6 +185,11 @@
 #define MCUBOOT_CUSTOM_DATA_SHARING_FUNCTION
 #endif
 
+#ifdef CONFIG_BOOT_SHARE_BACKEND_EXTERNAL
+#define MCUBOOT_SHARED_DATA_BASE CONFIG_BOOT_SHARE_BACKEND_EXTERNAL_DATA_BASE
+#define MCUBOOT_SHARED_DATA_SIZE CONFIG_BOOT_SHARE_BACKEND_EXTERNAL_DATA_SIZE
+#endif
+
 #ifdef CONFIG_BOOT_SHARE_DATA_BOOTINFO
 #define MCUBOOT_DATA_SHARING_BOOTINFO
 #endif