Fix: mbox output

include/mbox.h

@@ -40,9 +40,12 @@ extern volatile unsigned int mbox[36];
 #define MBOX_CH_PROP    8
 
 /* tags */
-#define MBOX_TAG_GETSERIAL      0x10004
 #define MBOX_TAG_LAST           0
 #define MBOX_TAG_BOARD_REVISION 0x00010002
+#define MBOX_TAG_GETSERIAL      0x00010004
+#define MBOX_TAG_ARM_MEMORY     0x00010005
 
 int mbox_call(unsigned char ch);
 unsigned int get_board_revision(void);
+unsigned int get_memory_base_addr(void);
+unsigned int get_memory_size(void);