diff --git a/drivers/net/tsec.c b/drivers/net/tsec.c
index 3e4c3bd..5fa6f61 100644
--- a/drivers/net/tsec.c
+++ b/drivers/net/tsec.c
@@ -281,12 +281,16 @@
 		| TBIANA_FULL_DUPLEX \
 		)
 
-/* Force the TBI PHY into 1000Mbps full duplex when in SGMII mode */
+/* By default force the TBI PHY into 1000Mbps full duplex when in SGMII mode */
+#ifndef CONFIG_TSEC_TBICR_SETTINGS
 #define TBICR_SETTINGS ( \
 		TBICR_PHY_RESET \
 		| TBICR_FULL_DUPLEX \
 		| TBICR_SPEED1_SET \
 		)
+#else
+#define TBICR_SETTINGS CONFIG_TSEC_TBICR_SETTINGS
+#endif /* CONFIG_TSEC_TBICR_SETTINGS */
 
 /* Configure the TBI for SGMII operation */
 static void tsec_configure_serdes(struct tsec_private *priv)
diff --git a/include/configs/P1_P2_RDB.h b/include/configs/P1_P2_RDB.h
index 125911f..b891730 100644
--- a/include/configs/P1_P2_RDB.h
+++ b/include/configs/P1_P2_RDB.h
@@ -425,6 +425,15 @@
 #define CONFIG_ETHPRIME		"eTSEC1"
 
 #define CONFIG_PHY_GIGE		1	/* Include GbE speed/duplex detection */
+
+/* TBI PHY configuration for SGMII mode */
+#define CONFIG_TSEC_TBICR_SETTINGS ( \
+		TBICR_PHY_RESET \
+		| TBICR_ANEG_ENABLE \
+		| TBICR_FULL_DUPLEX \
+		| TBICR_SPEED1_SET \
+		)
+
 #endif	/* CONFIG_TSEC_ENET */
 
 /*