Index: firmware/App/Common.h
===================================================================
diff -u -r09e6320e3f3c3c973de0b66e5799d710db8cc427 -r5a58fd72ededee8a718098b53448a2c921c57f49
--- firmware/App/Common.h	(.../Common.h)	(revision 09e6320e3f3c3c973de0b66e5799d710db8cc427)
+++ firmware/App/Common.h	(.../Common.h)	(revision 5a58fd72ededee8a718098b53448a2c921c57f49)
@@ -24,6 +24,7 @@
 #define MASK_OFF_MSB                          0x00FF                                                    ///< Bits to mask off the most significant byte of a 2-byte word.
 #define MASK_OFF_LSB                          0xFF00                                                    ///< Bits to mask off the least significant byte of a 2-byte word.
 #define SHIFT_8_BITS_FOR_BYTE_SHIFT           8                                                         ///< Number of bits to shift in order to shift a byte.
+#define SHIFT_4_BITS_FOR_NIBBLE               4                                                         ///< Number of bits to shift in order to shift a nibble.
 #define MASK_OFF_NIBBLE_MSB                   0x0F                                                      ///< Bits to mask off the most significant nibble of a byte.
 #define SW_UPDATE_LEN_MSB_INDEX               3                                                         ///< Software update payload length most significant byte.
 #define SW_UPDATE_LEN_LSB_INDEX               2                                                         ///< Software update payload length least significant byte.
@@ -82,6 +83,14 @@
     NUM_OF_UPDATE_DESTS                                                                                 ///< Number of update destinations.
 } SW_UPDATE_DESINTATION_T;
 
+/// Software update stack
+typedef enum SW_Stacks
+{
+    TD = 0,                                                                                             ///< TD.
+    DD,                                                                                                 ///< DD.
+    NUM_OF_STACKS                                                                                       ///< Number of software stacks.
+} SW_UPDATE_STACK_T;
+
 /// Software update CAN mailboxes enumeration
 typedef enum SW_Update_CAN_Mail_Boxes
 {
@@ -124,10 +133,7 @@
 {
     UPDATE_CMD_START = 0,                                                                               ///< Update command start.
     UPDATE_CMD_ABORT,                                                                                   ///< Update command abort.
-    UPDATE_CMD_RUNAPP,  // TODO is this needed?
     UPDATE_CMD_VERIFY,                                                                                  ///< Update command verify.
-    UPDATE_CMD_VERSION,  // TODO is this needed?
-    UPDATE_CMD_VERIFIED, // TODO is this needed?
     UPDATE_CMD_RESYNC,                                                                                  ///< Update command resync.
     UPDATE_CMD_IDLE,                                                                                    ///< Update command idle.
     NUM_OF_UPDATE_CMDS                                                                                  ///< Number of update commands.