Need to change logic to support later versions of Yukon 2 EC_U chip.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>

--- a/drivers/net/sky2.c	2010-03-29 08:48:16.490429444 -0700
+++ b/drivers/net/sky2.c	2010-03-29 09:27:36.485594685 -0700
@@ -876,6 +876,10 @@ static void sky2_mac_init(struct sky2_hw
 
 	if (hw->dev[port]->mtu > ETH_DATA_LEN)
 		reg |= GM_SMOD_JUMBO_ENA;
+
+	if (hw->chip_id == CHIP_ID_YUKON_EC_U &&
+	    hw->chip_rev == CHIP_REV_YU_EC_U_B1)
+		reg |= GM_NEW_FLOW_CTRL;
 
 	gma_write16(hw, port, GM_SERIAL_MODE, reg);
 
@@ -1413,8 +1417,7 @@ static void sky2_rx_start(struct sky2_po
 	/* These chips have no ram buffer?
 	 * MAC Rx RAM Read is controlled by hardware */
 	if (hw->chip_id == CHIP_ID_YUKON_EC_U &&
-	    (hw->chip_rev == CHIP_REV_YU_EC_U_A1 ||
-	     hw->chip_rev == CHIP_REV_YU_EC_U_B0))
+	    hw->chip_rev > CHIP_REV_YU_EC_U_A0)
 		sky2_write32(hw, Q_ADDR(rxq, Q_TEST), F_M_RX_RAM_DIS);
 
 	sky2_prefetch_init(hw, rxq, sky2->rx_le_map, RX_LE_SIZE - 1);
--- a/drivers/net/sky2.h	2010-03-29 08:52:02.480429332 -0700
+++ b/drivers/net/sky2.h	2010-03-29 09:25:32.122900699 -0700
@@ -557,6 +557,7 @@ enum yukon_ec_u_rev {
 	CHIP_REV_YU_EC_U_A0  = 1,
 	CHIP_REV_YU_EC_U_A1  = 2,
 	CHIP_REV_YU_EC_U_B0  = 3,
+	CHIP_REV_YU_EC_U_B1  = 5,
 };
 enum yukon_fe_rev {
 	CHIP_REV_YU_FE_A1    = 1,
@@ -1775,10 +1776,13 @@ enum {
 /*	GM_SERIAL_MODE			16 bit r/w	Serial Mode Register */
 enum {
 	GM_SMOD_DATABL_MSK	= 0x1f<<11, /* Bit 15..11:	Data Blinder (r/o) */
-	GM_SMOD_LIMIT_4		= 1<<10, /* Bit 10:	4 consecutive Tx trials */
-	GM_SMOD_VLAN_ENA	= 1<<9,	/* Bit  9:	Enable VLAN  (Max. Frame Len) */
-	GM_SMOD_JUMBO_ENA	= 1<<8,	/* Bit  8:	Enable Jumbo (Max. Frame Len) */
-	 GM_SMOD_IPG_MSK	= 0x1f	/* Bit 4..0:	Inter-Packet Gap (IPG) */
+	GM_SMOD_LIMIT_4		= 1<<10, /* 4 consecutive Tx trials */
+	GM_SMOD_VLAN_ENA	= 1<<9,	 /* Enable VLAN  (Max. Frame Len) */
+	GM_SMOD_JUMBO_ENA	= 1<<8,	 /* Enable Jumbo (Max. Frame Len) */
+
+	GM_NEW_FLOW_CTRL	= 1<<6,	 /* Enable New Flow-Control */
+
+	GM_SMOD_IPG_MSK		= 0x1f	 /* Bit 4..0:	Inter-Packet Gap (IPG) */
 };
 
 #define DATA_BLIND_VAL(x)	(((x)<<11) & GM_SMOD_DATABL_MSK)

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