Index: firmware/App/Common.h
===================================================================
diff -u -rf100557efc2f7916054a63bbafb187d8017914d0 -rfc4f469fe234371e8f2b9a0625acc66faa6899de
--- firmware/App/Common.h	(.../Common.h)	(revision f100557efc2f7916054a63bbafb187d8017914d0)
+++ firmware/App/Common.h	(.../Common.h)	(revision fc4f469fe234371e8f2b9a0625acc66faa6899de)
@@ -8,6 +8,7 @@
 #ifndef __COMMON_H__
 #define __COMMON_H__
 
+#define NUM_OF_FW_STACKS            3
 #define FIRMWARE_START_ADDRESS                0x00010000
 #define FIRMWARE_CRC_TABLE_ADDRESS            0x10020             ///< The starting address of CRC table for firmware image.
 #define SW_UPDATE_FLASH_BUFFER_SIZE           128
@@ -60,13 +61,13 @@
 
 typedef enum SW_Update_CAN_Mail_Boxes
 {
-    SW_UPDATE_NOT_USED = 0,
-    SW_UPDATE_COMMAD,
-    SW_UPDATE_TD_UPDATE,
-    SW_UPDATE_DD_UPDATE,
-    SW_UPDATE_RO_UPDATE,
-    PLACE_HOLDER_TO_REMOVE_CAN,
-    SW_UPDATE_RESP,
+    SW_UPDATE_NOT_USED = 0,  // 0
+    SW_UPDATE_COMMAD,        // 0x601
+    SW_UPDATE_TD_UPDATE,     // 0x602
+    SW_UPDATE_DD_UPDATE,     // 0x603
+    SW_UPDATE_RO_UPDATE,     // 0x604
+    PLACE_HOLDER_TO_REMOVE_CAN, // 0x606
+    SW_UPDATE_RESP,             // 0x607
     NUM_OF_SW_UPDATE_MBOXES,
 } SW_UPDATE_CAN_MAIL_BOX_T;