zephyr: added address/size of bootloader/firmware shared memory area

Added definitions of base address and size of user-defined
shared memory area between bootloader and runtime firmware, when using
BOOT_SHARE_BACKEND_EXTERNAL.

It's possible to select Kconfig BOOT_SHARE_BACKEND_EXTERNAL, but then
mcuboot expects the following symbols:
MCUBOOT_SHARED_DATA_BASE and MCUBOOT_SHARED_DATA_SIZE.
There was no way to set them via KConfig and compilation fails.

This patch adds KConfig symbols that give the possibility to set them.

Signed-off-by: Michal Konieczny <[email protected]>

Author: m5k8

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

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