diff --git a/target/linux/ar7/files-2.6.30/include/asm-mips/ar7/ar7.h b/target/linux/ar7/files-2.6.30/include/asm-mips/ar7/ar7.h
index 19b5289fdd..f37e82f5cb 100644
--- a/target/linux/ar7/files-2.6.30/include/asm-mips/ar7/ar7.h
+++ b/target/linux/ar7/files-2.6.30/include/asm-mips/ar7/ar7.h
@@ -44,8 +44,10 @@
 #define UR8_REGS_WDT	(AR7_REGS_BASE + 0x0b00)
 #define UR8_REGS_UART1	(AR7_REGS_BASE + 0x0f00)
 
-#define TITAN_REGS_MAC0		(0x08640000)
-#define TITAN_REGS_MAC1		(TITAN_REGS_MAC0 + 0x0800)
+#define TITAN_REGS_ESWITCH_BASE	(0x08640000) 
+#define TITAN_REGS_MAC0		(TITAN_REGS_ESWITCH_BASE + 0) 
+#define TITAN_REGS_MAC1		(TITAN_REGS_ESWITCH_BASE + 0x0800) 
+#define TITAN_REGS_MDIO		(TITAN_REGS_ESWITCH_BASE + 0x02000) 
 #define TITAN_REGS_VLYNQ0	(AR7_REGS_BASE + 0x1c00)
 #define TITAN_REGS_VLYNQ1	(AR7_REGS_BASE + 0x1300)