diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 2de1ab6278d5..9ff97cc7e916 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -782,7 +782,7 @@ static int tg3_readphy(struct tg3 *tp, int reg, u32 *val)
 
 	*val = 0x0;
 
-	frame_val  = ((PHY_ADDR << MI_COM_PHY_ADDR_SHIFT) &
+	frame_val  = ((tp->phy_addr << MI_COM_PHY_ADDR_SHIFT) &
 		      MI_COM_PHY_ADDR_MASK);
 	frame_val |= ((reg << MI_COM_REG_ADDR_SHIFT) &
 		      MI_COM_REG_ADDR_MASK);
@@ -833,7 +833,7 @@ static int tg3_writephy(struct tg3 *tp, int reg, u32 val)
 		udelay(80);
 	}
 
-	frame_val  = ((PHY_ADDR << MI_COM_PHY_ADDR_SHIFT) &
+	frame_val  = ((tp->phy_addr << MI_COM_PHY_ADDR_SHIFT) &
 		      MI_COM_PHY_ADDR_MASK);
 	frame_val |= ((reg << MI_COM_REG_ADDR_SHIFT) &
 		      MI_COM_REG_ADDR_MASK);
@@ -1021,6 +1021,21 @@ static void tg3_mdio_start(struct tg3 *tp)
 	tw32_f(MAC_MI_MODE, tp->mi_mode);
 	udelay(80);
 
+	if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5717) {
+		u32 funcnum, is_serdes;
+
+		funcnum = tr32(TG3_CPMU_STATUS) & TG3_CPMU_STATUS_PCIE_FUNC;
+		if (funcnum)
+			tp->phy_addr = 2;
+		else
+			tp->phy_addr = 1;
+
+		is_serdes = tr32(SG_DIG_STATUS) & SG_DIG_IS_SERDES;
+		if (is_serdes)
+			tp->phy_addr += 7;
+	} else
+		tp->phy_addr = PHY_ADDR;
+
 	if ((tp->tg3_flags3 & TG3_FLG3_MDIOBUS_INITED) &&
 	    GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5785)
 		tg3_mdio_config_5785(tp);
@@ -9266,7 +9281,7 @@ static int tg3_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 		cmd->speed = tp->link_config.active_speed;
 		cmd->duplex = tp->link_config.active_duplex;
 	}
-	cmd->phy_address = PHY_ADDR;
+	cmd->phy_address = tp->phy_addr;
 	cmd->transceiver = XCVR_INTERNAL;
 	cmd->autoneg = tp->link_config.autoneg;
 	cmd->maxtxpkt = 0;
@@ -10570,7 +10585,7 @@ static int tg3_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 
 	switch(cmd) {
 	case SIOCGMIIPHY:
-		data->phy_id = PHY_ADDR;
+		data->phy_id = tp->phy_addr;
 
 		/* fallthru */
 	case SIOCGMIIREG: {
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index ea57a3a4372c..82b45d8797b4 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -694,6 +694,7 @@
 #define  SG_DIG_PARTNER_FULL_DUPLEX	 0x00020000 /* If !MRADV_CRC16_SELECT */
 #define  SG_DIG_PARTNER_NEXT_PAGE	 0x00010000 /* If !MRADV_CRC16_SELECT */
 #define  SG_DIG_AUTONEG_STATE_MASK	 0x00000ff0
+#define  SG_DIG_IS_SERDES		 0x00000100
 #define  SG_DIG_COMMA_DETECTOR		 0x00000008
 #define  SG_DIG_MAC_ACK_STATUS		 0x00000004
 #define  SG_DIG_AUTONEG_COMPLETE	 0x00000002
@@ -2805,6 +2806,8 @@ struct tg3 {
 	struct mii_bus			*mdio_bus;
 	int				mdio_irq[PHY_MAX_ADDR];
 
+	u8				phy_addr;
+
 	/* PHY info */
 	u32				phy_id;
 #define PHY_ID_MASK			0xfffffff0