diff --git a/arch/blackfin/include/asm/mach-bf609/BF609_def.h b/arch/blackfin/include/asm/mach-bf609/BF609_def.h
index 02b81d3fd11ab22c61c4b58a76f2a0d9e3ce2573..fd0d86d39e55aa3514e0bb1ba7c58bd8371fbb3d 100644
--- a/arch/blackfin/include/asm/mach-bf609/BF609_def.h
+++ b/arch/blackfin/include/asm/mach-bf609/BF609_def.h
@@ -125,6 +125,8 @@
 #define WDOG1_CNT         0xFFC17804 /* WDOG1 Count Register */
 #define WDOG1_STAT        0xFFC17808 /* WDOG1 Watchdog Timer Status Register */
 
+#define SDU0_MSG_SET      0xFFC1F084 /* SDU0 Message Set Register */
+
 #define EMAC0_MACCFG      0xFFC20000 /* EMAC0 MAC Configuration Register */
 #define EMAC1_MACCFG      0xFFC22000 /* EMAC1 MAC Configuration Register */