diff --git a/arch/powerpc/boot/dts/canyonlands.dts b/arch/powerpc/boot/dts/canyonlands.dts
index f9fe032..79fe412 100644
--- a/arch/powerpc/boot/dts/canyonlands.dts
+++ b/arch/powerpc/boot/dts/canyonlands.dts
@@ -266,7 +266,7 @@
 
 			EMAC0: ethernet@ef600e00 {
 				device_type = "network";
-				compatible = "ibm,emac-460ex", "ibm,emac4";
+				compatible = "ibm,emac-460ex", "ibm,emac4sync";
 				interrupt-parent = <&EMAC0>;
 				interrupts = <0x0 0x1>;
 				#interrupt-cells = <1>;
@@ -274,7 +274,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC2 0x10 0x4
 						 /*Wake*/   0x1 &UIC2 0x14 0x4>;
-				reg = <0xef600e00 0x00000070>;
+				reg = <0xef600e00 0x000000c4>;
 				local-mac-address = [000000000000]; /* Filled in by U-Boot */
 				mal-device = <&MAL0>;
 				mal-tx-channel = <0>;
@@ -295,7 +295,7 @@
 
 			EMAC1: ethernet@ef600f00 {
 				device_type = "network";
-				compatible = "ibm,emac-460ex", "ibm,emac4";
+				compatible = "ibm,emac-460ex", "ibm,emac4sync";
 				interrupt-parent = <&EMAC1>;
 				interrupts = <0x0 0x1>;
 				#interrupt-cells = <1>;
@@ -303,7 +303,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC2 0x11 0x4
 						 /*Wake*/   0x1 &UIC2 0x15 0x4>;
-				reg = <0xef600f00 0x00000070>;
+				reg = <0xef600f00 0x000000c4>;
 				local-mac-address = [000000000000]; /* Filled in by U-Boot */
 				mal-device = <&MAL0>;
 				mal-tx-channel = <1>;
diff --git a/arch/powerpc/boot/dts/glacier.dts b/arch/powerpc/boot/dts/glacier.dts
index 463650c..24cf0db 100644
--- a/arch/powerpc/boot/dts/glacier.dts
+++ b/arch/powerpc/boot/dts/glacier.dts
@@ -283,7 +283,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC2 0x10 0x4
 						 /*Wake*/   0x1 &UIC2 0x14 0x4>;
-				reg = <0xef600e00 0x00000070>;
+				reg = <0xef600e00 0x00000074>;
 				local-mac-address = [000000000000]; /* Filled in by U-Boot */
 				mal-device = <&MAL0>;
 				mal-tx-channel = <0>;
@@ -312,7 +312,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC2 0x11 0x4
 						 /*Wake*/   0x1 &UIC2 0x15 0x4>;
-				reg = <0xef600f00 0x00000070>;
+				reg = <0xef600f00 0x00000074>;
 				local-mac-address = [000000000000]; /* Filled in by U-Boot */
 				mal-device = <&MAL0>;
 				mal-tx-channel = <1>;
@@ -342,7 +342,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC2 0x12 0x4
 						 /*Wake*/   0x1 &UIC2 0x16 0x4>;
-				reg = <0xef601100 0x00000070>;
+				reg = <0xef601100 0x00000074>;
 				local-mac-address = [000000000000]; /* Filled in by U-Boot */
 				mal-device = <&MAL0>;
 				mal-tx-channel = <2>;
@@ -370,7 +370,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC2 0x13 0x4
 						 /*Wake*/   0x1 &UIC2 0x17 0x4>;
-				reg = <0xef601200 0x00000070>;
+				reg = <0xef601200 0x00000074>;
 				local-mac-address = [000000000000]; /* Filled in by U-Boot */
 				mal-device = <&MAL0>;
 				mal-tx-channel = <3>;
diff --git a/arch/powerpc/boot/dts/haleakala.dts b/arch/powerpc/boot/dts/haleakala.dts
index 2c2fcea..513bc43 100644
--- a/arch/powerpc/boot/dts/haleakala.dts
+++ b/arch/powerpc/boot/dts/haleakala.dts
@@ -206,7 +206,7 @@
 			EMAC0: ethernet@ef600900 {
 				linux,network-index = <0x0>;
 				device_type = "network";
-				compatible = "ibm,emac-405exr", "ibm,emac4";
+				compatible = "ibm,emac-405exr", "ibm,emac4sync";
 				interrupt-parent = <&EMAC0>;
 				interrupts = <0x0 0x1>;
 				#interrupt-cells = <1>;
@@ -214,7 +214,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC0 0x18 0x4
 						/*Wake*/  0x1 &UIC1 0x1d 0x4>;
-				reg = <0xef600900 0x00000070>;
+				reg = <0xef600900 0x000000c4>;
 				local-mac-address = [000000000000]; /* Filled in by U-Boot */
 				mal-device = <&MAL0>;
 				mal-tx-channel = <0>;
diff --git a/arch/powerpc/boot/dts/katmai.dts b/arch/powerpc/boot/dts/katmai.dts
index b94bf61..077819b 100644
--- a/arch/powerpc/boot/dts/katmai.dts
+++ b/arch/powerpc/boot/dts/katmai.dts
@@ -208,7 +208,7 @@
 				compatible = "ibm,emac-440spe", "ibm,emac4";
 				interrupt-parent = <&UIC1>;
 				interrupts = <0x1c 0x4 0x1d 0x4>;
-				reg = <0x10000800 0x00000070>;
+				reg = <0x10000800 0x00000074>;
 				local-mac-address = [000000000000];
 				mal-device = <&MAL0>;
 				mal-tx-channel = <0>;
diff --git a/arch/powerpc/boot/dts/kilauea.dts b/arch/powerpc/boot/dts/kilauea.dts
index 3ed6a8f..dececc4 100644
--- a/arch/powerpc/boot/dts/kilauea.dts
+++ b/arch/powerpc/boot/dts/kilauea.dts
@@ -207,7 +207,7 @@
 			EMAC0: ethernet@ef600900 {
 				linux,network-index = <0x0>;
 				device_type = "network";
-				compatible = "ibm,emac-405ex", "ibm,emac4";
+				compatible = "ibm,emac-405ex", "ibm,emac4sync";
 				interrupt-parent = <&EMAC0>;
 				interrupts = <0x0 0x1>;
 				#interrupt-cells = <1>;
@@ -215,7 +215,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC0 0x18 0x4
 						/*Wake*/  0x1 &UIC1 0x1d 0x4>;
-				reg = <0xef600900 0x00000070>;
+				reg = <0xef600900 0x000000c4>;
 				local-mac-address = [000000000000]; /* Filled in by U-Boot */
 				mal-device = <&MAL0>;
 				mal-tx-channel = <0>;
@@ -235,7 +235,7 @@
 			EMAC1: ethernet@ef600a00 {
 				linux,network-index = <0x1>;
 				device_type = "network";
-				compatible = "ibm,emac-405ex", "ibm,emac4";
+				compatible = "ibm,emac-405ex", "ibm,emac4sync";
 				interrupt-parent = <&EMAC1>;
 				interrupts = <0x0 0x1>;
 				#interrupt-cells = <1>;
@@ -243,7 +243,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC0 0x19 0x4
 						/*Wake*/  0x1 &UIC1 0x1f 0x4>;
-				reg = <0xef600a00 0x00000070>;
+				reg = <0xef600a00 0x000000c4>;
 				local-mac-address = [000000000000]; /* Filled in by U-Boot */
 				mal-device = <&MAL0>;
 				mal-tx-channel = <1>;
diff --git a/arch/powerpc/boot/dts/makalu.dts b/arch/powerpc/boot/dts/makalu.dts
index 1dfcd7e..945508c 100644
--- a/arch/powerpc/boot/dts/makalu.dts
+++ b/arch/powerpc/boot/dts/makalu.dts
@@ -207,7 +207,7 @@
 			EMAC0: ethernet@ef600900 {
 				linux,network-index = <0x0>;
 				device_type = "network";
-				compatible = "ibm,emac-405ex", "ibm,emac4";
+				compatible = "ibm,emac-405ex", "ibm,emac4sync";
 				interrupt-parent = <&EMAC0>;
 				interrupts = <0x0 0x1>;
 				#interrupt-cells = <1>;
@@ -215,7 +215,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC0 0x18 0x4
 						/*Wake*/  0x1 &UIC1 0x1d 0x4>;
-				reg = <0xef600900 0x00000070>;
+				reg = <0xef600900 0x000000c4>;
 				local-mac-address = [000000000000]; /* Filled in by U-Boot */
 				mal-device = <&MAL0>;
 				mal-tx-channel = <0>;
@@ -235,7 +235,7 @@
 			EMAC1: ethernet@ef600a00 {
 				linux,network-index = <0x1>;
 				device_type = "network";
-				compatible = "ibm,emac-405ex", "ibm,emac4";
+				compatible = "ibm,emac-405ex", "ibm,emac4sync";
 				interrupt-parent = <&EMAC1>;
 				interrupts = <0x0 0x1>;
 				#interrupt-cells = <1>;
@@ -243,7 +243,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC0 0x19 0x4
 						/*Wake*/  0x1 &UIC1 0x1f 0x4>;
-				reg = <0xef600a00 0x00000070>;
+				reg = <0xef600a00 0x000000c4>;
 				local-mac-address = [000000000000]; /* Filled in by U-Boot */
 				mal-device = <&MAL0>;
 				mal-tx-channel = <1>;
diff --git a/arch/powerpc/boot/dts/rainier.dts b/arch/powerpc/boot/dts/rainier.dts
index 2afb63a..9684c80 100644
--- a/arch/powerpc/boot/dts/rainier.dts
+++ b/arch/powerpc/boot/dts/rainier.dts
@@ -265,7 +265,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC0 0x18 0x4
 						/*Wake*/  0x1 &UIC1 0x1d 0x4>;
-				reg = <0xef600e00 0x00000070>;
+				reg = <0xef600e00 0x00000074>;
 				local-mac-address = [000000000000];
 				mal-device = <&MAL0>;
 				mal-tx-channel = <0>;
@@ -294,7 +294,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC0 0x19 0x4
 						/*Wake*/  0x1 &UIC1 0x1f 0x4>;
-				reg = <0xef600f00 0x00000070>;
+				reg = <0xef600f00 0x00000074>;
 				local-mac-address = [000000000000];
 				mal-device = <&MAL0>;
 				mal-tx-channel = <1>;
diff --git a/arch/powerpc/boot/dts/sequoia.dts b/arch/powerpc/boot/dts/sequoia.dts
index 149dabc..72d15f0 100644
--- a/arch/powerpc/boot/dts/sequoia.dts
+++ b/arch/powerpc/boot/dts/sequoia.dts
@@ -280,7 +280,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC0 0x18 0x4
 						/*Wake*/  0x1 &UIC1 0x1d 0x4>;
-				reg = <0xef600e00 0x00000070>;
+				reg = <0xef600e00 0x00000074>;
 				local-mac-address = [000000000000];
 				mal-device = <&MAL0>;
 				mal-tx-channel = <0>;
@@ -309,7 +309,7 @@
 				#size-cells = <0>;
 				interrupt-map = </*Status*/ 0x0 &UIC0 0x19 0x4
 						/*Wake*/  0x1 &UIC1 0x1f 0x4>;
-				reg = <0xef600f00 0x00000070>;
+				reg = <0xef600f00 0x00000074>;
 				local-mac-address = [000000000000];
 				mal-device = <&MAL0>;
 				mal-tx-channel = <1>;
diff --git a/arch/powerpc/boot/dts/taishan.dts b/arch/powerpc/boot/dts/taishan.dts
index d4867de..058438f 100644
--- a/arch/powerpc/boot/dts/taishan.dts
+++ b/arch/powerpc/boot/dts/taishan.dts
@@ -287,7 +287,7 @@
 				compatible = "ibm,emac-440gx", "ibm,emac4";
 				interrupt-parent = <&UIC1>;
 				interrupts = <0x1c 0x4 0x1d 0x4>;
-				reg = <0x40000800 0x00000070>;
+				reg = <0x40000800 0x00000074>;
 				local-mac-address = [000000000000]; // Filled in by zImage
 				mal-device = <&MAL0>;
 				mal-tx-channel = <0>;
@@ -307,7 +307,7 @@
 				compatible = "ibm,emac-440gx", "ibm,emac4";
 				interrupt-parent = <&UIC1>;
 				interrupts = <0x1e 0x4 0x1f 0x4>;
-				reg = <0x40000900 0x00000070>;
+				reg = <0x40000900 0x00000074>;
 				local-mac-address = [000000000000]; // Filled in by zImage
 				mal-device = <&MAL0>;
 				mal-tx-channel = <1>;
@@ -327,7 +327,7 @@
 				compatible = "ibm,emac-440gx", "ibm,emac4";
 				interrupt-parent = <&UIC2>;
 				interrupts = <0x0 0x4 0x1 0x4>;
-				reg = <0x40000c00 0x00000070>;
+				reg = <0x40000c00 0x00000074>;
 				local-mac-address = [000000000000]; // Filled in by zImage
 				mal-device = <&MAL0>;
 				mal-tx-channel = <2>;
@@ -351,7 +351,7 @@
 				compatible = "ibm,emac-440gx", "ibm,emac4";
 				interrupt-parent = <&UIC2>;
 				interrupts = <0x2 0x4 0x3 0x4>;
-				reg = <0x40000e00 0x00000070>;
+				reg = <0x40000e00 0x00000074>;
 				local-mac-address = [000000000000]; // Filled in by zImage
 				mal-device = <&MAL0>;
 				mal-tx-channel = <3>;
diff --git a/drivers/net/ibm_newemac/core.c b/drivers/net/ibm_newemac/core.c
index 5d2108c..ed24a1d 100644
--- a/drivers/net/ibm_newemac/core.c
+++ b/drivers/net/ibm_newemac/core.c
@@ -363,25 +363,31 @@
 
 static void emac_hash_mc(struct emac_instance *dev)
 {
-	struct emac_regs __iomem *p = dev->emacp;
-	u16 gaht[4] = { 0 };
+	const int regs = EMAC_XAHT_REGS(dev);
+	u32 *gaht_base = emac_gaht_base(dev);
+	u32 gaht_temp[regs];
 	struct dev_mc_list *dmi;
+	int i;
 
 	DBG(dev, "hash_mc %d" NL, dev->ndev->mc_count);
 
+	memset(gaht_temp, 0, sizeof (gaht_temp));
+
 	for (dmi = dev->ndev->mc_list; dmi; dmi = dmi->next) {
-		int bit;
+		int slot, reg, mask;
 		DBG2(dev, "mc %02x:%02x:%02x:%02x:%02x:%02x" NL,
 		     dmi->dmi_addr[0], dmi->dmi_addr[1], dmi->dmi_addr[2],
 		     dmi->dmi_addr[3], dmi->dmi_addr[4], dmi->dmi_addr[5]);
 
-		bit = 63 - (ether_crc(ETH_ALEN, dmi->dmi_addr) >> 26);
-		gaht[bit >> 4] |= 0x8000 >> (bit & 0x0f);
+		slot = EMAC_XAHT_CRC_TO_SLOT(dev, ether_crc(ETH_ALEN, dmi->dmi_addr));
+		reg = EMAC_XAHT_SLOT_TO_REG(dev, slot);
+		mask = EMAC_XAHT_SLOT_TO_MASK(dev, slot);
+
+		gaht_temp[reg] |= mask;
 	}
-	out_be32(&p->gaht1, gaht[0]);
-	out_be32(&p->gaht2, gaht[1]);
-	out_be32(&p->gaht3, gaht[2]);
-	out_be32(&p->gaht4, gaht[3]);
+
+	for (i = 0; i < regs; i++)
+		out_be32(gaht_base + i, gaht_temp[i]);
 }
 
 static inline u32 emac_iff2rmr(struct net_device *ndev)
@@ -398,7 +404,8 @@
 
 	if (ndev->flags & IFF_PROMISC)
 		r |= EMAC_RMR_PME;
-	else if (ndev->flags & IFF_ALLMULTI || ndev->mc_count > 32)
+	else if (ndev->flags & IFF_ALLMULTI ||
+			 (ndev->mc_count > EMAC_XAHT_SLOTS(dev)))
 		r |= EMAC_RMR_PMME;
 	else if (ndev->mc_count > 0)
 		r |= EMAC_RMR_MAE;
@@ -542,7 +549,7 @@
 			/* Put some arbitrary OUI, Manuf & Rev IDs so we can
 			 * identify this GPCS PHY later.
 			 */
-			out_be32(&p->ipcr, 0xdeadbeef);
+			out_be32(&p->u1.emac4.ipcr, 0xdeadbeef);
 		} else
 			mr1 |= EMAC_MR1_MF_1000;
 
@@ -2015,10 +2022,10 @@
 {
 	if (emac_has_feature(dev, EMAC_FTR_EMAC4))
 		return sizeof(struct emac_ethtool_regs_subhdr) +
-			EMAC4_ETHTOOL_REGS_SIZE;
+			EMAC4_ETHTOOL_REGS_SIZE(dev);
 	else
 		return sizeof(struct emac_ethtool_regs_subhdr) +
-			EMAC_ETHTOOL_REGS_SIZE;
+			EMAC_ETHTOOL_REGS_SIZE(dev);
 }
 
 static int emac_ethtool_get_regs_len(struct net_device *ndev)
@@ -2045,12 +2052,12 @@
 	hdr->index = dev->cell_index;
 	if (emac_has_feature(dev, EMAC_FTR_EMAC4)) {
 		hdr->version = EMAC4_ETHTOOL_REGS_VER;
-		memcpy_fromio(hdr + 1, dev->emacp, EMAC4_ETHTOOL_REGS_SIZE);
-		return ((void *)(hdr + 1) + EMAC4_ETHTOOL_REGS_SIZE);
+		memcpy_fromio(hdr + 1, dev->emacp, EMAC4_ETHTOOL_REGS_SIZE(dev));
+		return ((void *)(hdr + 1) + EMAC4_ETHTOOL_REGS_SIZE(dev));
 	} else {
 		hdr->version = EMAC_ETHTOOL_REGS_VER;
-		memcpy_fromio(hdr + 1, dev->emacp, EMAC_ETHTOOL_REGS_SIZE);
-		return ((void *)(hdr + 1) + EMAC_ETHTOOL_REGS_SIZE);
+		memcpy_fromio(hdr + 1, dev->emacp, EMAC_ETHTOOL_REGS_SIZE(dev));
+		return ((void *)(hdr + 1) + EMAC_ETHTOOL_REGS_SIZE(dev));
 	}
 }
 
@@ -2540,7 +2547,9 @@
 	}
 
 	/* Check EMAC version */
-	if (of_device_is_compatible(np, "ibm,emac4")) {
+	if (of_device_is_compatible(np, "ibm,emac4sync")) {
+		dev->features |= (EMAC_FTR_EMAC4 | EMAC_FTR_EMAC4SYNC);
+	} else if (of_device_is_compatible(np, "ibm,emac4")) {
 		dev->features |= EMAC_FTR_EMAC4;
 		if (of_device_is_compatible(np, "ibm,emac-440gx"))
 			dev->features |= EMAC_FTR_440GX_PHY_CLK_FIX;
@@ -2601,6 +2610,15 @@
 	}
 	memcpy(dev->ndev->dev_addr, p, 6);
 
+	/* IAHT and GAHT filter parameterization */
+	if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC)) {
+		dev->xaht_slots_shift = EMAC4SYNC_XAHT_SLOTS_SHIFT;
+		dev->xaht_width_shift = EMAC4SYNC_XAHT_WIDTH_SHIFT;
+	} else {
+		dev->xaht_slots_shift = EMAC4_XAHT_SLOTS_SHIFT;
+		dev->xaht_width_shift = EMAC4_XAHT_WIDTH_SHIFT;
+	}
+
 	DBG(dev, "features     : 0x%08x / 0x%08x\n", dev->features, EMAC_FTRS_POSSIBLE);
 	DBG(dev, "tx_fifo_size : %d (%d gige)\n", dev->tx_fifo_size, dev->tx_fifo_size_gige);
 	DBG(dev, "rx_fifo_size : %d (%d gige)\n", dev->rx_fifo_size, dev->rx_fifo_size_gige);
@@ -2672,7 +2690,8 @@
 		goto err_irq_unmap;
 	}
 	// TODO : request_mem_region
-	dev->emacp = ioremap(dev->rsrc_regs.start, sizeof(struct emac_regs));
+	dev->emacp = ioremap(dev->rsrc_regs.start,
+			     dev->rsrc_regs.end - dev->rsrc_regs.start + 1);
 	if (dev->emacp == NULL) {
 		printk(KERN_ERR "%s: Can't map device registers!\n",
 		       np->full_name);
@@ -2884,6 +2903,10 @@
 		.type		= "network",
 		.compatible	= "ibm,emac4",
 	},
+	{
+		.type		= "network",
+		.compatible	= "ibm,emac4sync",
+	},
 	{},
 };
 
diff --git a/drivers/net/ibm_newemac/core.h b/drivers/net/ibm_newemac/core.h
index 2230904..6545e69 100644
--- a/drivers/net/ibm_newemac/core.h
+++ b/drivers/net/ibm_newemac/core.h
@@ -235,6 +235,10 @@
 	u32				fifo_entry_size;
 	u32				mal_burst_size; /* move to MAL ? */
 
+	/* IAHT and GAHT filter parameterization */
+	u32				xaht_slots_shift;
+	u32				xaht_width_shift;
+
 	/* Descriptor management
 	 */
 	struct mal_descriptor		*tx_desc;
@@ -309,6 +313,10 @@
  * Set if we need phy clock workaround for 440ep or 440gr
  */
 #define EMAC_FTR_440EP_PHY_CLK_FIX	0x00000100
+/*
+ * The 405EX and 460EX contain the EMAC4SYNC core
+ */
+#define EMAC_FTR_EMAC4SYNC		0x00000200
 
 
 /* Right now, we don't quite handle the always/possible masks on the
@@ -320,7 +328,8 @@
 
 	EMAC_FTRS_POSSIBLE	=
 #ifdef CONFIG_IBM_NEW_EMAC_EMAC4
-	    EMAC_FTR_EMAC4 | EMAC_FTR_HAS_NEW_STACR |
+	    EMAC_FTR_EMAC4	| EMAC_FTR_EMAC4SYNC	|
+	    EMAC_FTR_HAS_NEW_STACR	|
 	    EMAC_FTR_STACR_OC_INVERT | EMAC_FTR_440GX_PHY_CLK_FIX |
 #endif
 #ifdef CONFIG_IBM_NEW_EMAC_TAH
@@ -342,6 +351,71 @@
 	       (EMAC_FTRS_POSSIBLE & dev->features & feature);
 }
 
+/*
+ * Various instances of the EMAC core have varying 1) number of
+ * address match slots, 2) width of the registers for handling address
+ * match slots, 3) number of registers for handling address match
+ * slots and 4) base offset for those registers.
+ *
+ * These macros and inlines handle these differences based on
+ * parameters supplied by the device structure which are, in turn,
+ * initialized based on the "compatible" entry in the device tree.
+ */
+
+#define	EMAC4_XAHT_SLOTS_SHIFT		6
+#define	EMAC4_XAHT_WIDTH_SHIFT		4
+
+#define	EMAC4SYNC_XAHT_SLOTS_SHIFT	8
+#define	EMAC4SYNC_XAHT_WIDTH_SHIFT	5
+
+#define	EMAC_XAHT_SLOTS(dev)         	(1 << (dev)->xaht_slots_shift)
+#define	EMAC_XAHT_WIDTH(dev)         	(1 << (dev)->xaht_width_shift)
+#define	EMAC_XAHT_REGS(dev)          	(1 << ((dev)->xaht_slots_shift - \
+					       (dev)->xaht_width_shift))
+
+#define	EMAC_XAHT_CRC_TO_SLOT(dev, crc)			\
+	((EMAC_XAHT_SLOTS(dev) - 1) -			\
+	 ((crc) >> ((sizeof (u32) * BITS_PER_BYTE) -	\
+		    (dev)->xaht_slots_shift)))
+
+#define	EMAC_XAHT_SLOT_TO_REG(dev, slot)		\
+	((slot) >> (dev)->xaht_width_shift)
+
+#define	EMAC_XAHT_SLOT_TO_MASK(dev, slot)		\
+	((u32)(1 << (EMAC_XAHT_WIDTH(dev) - 1)) >>	\
+	 ((slot) & (u32)(EMAC_XAHT_WIDTH(dev) - 1)))
+
+static inline u32 *emac_xaht_base(struct emac_instance *dev)
+{
+	struct emac_regs __iomem *p = dev->emacp;
+	int offset;
+
+	/* The first IAHT entry always is the base of the block of
+	 * IAHT and GAHT registers.
+	 */
+	if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC))
+		offset = offsetof(struct emac_regs, u1.emac4sync.iaht1);
+	else
+		offset = offsetof(struct emac_regs, u0.emac4.iaht1);
+
+	return ((u32 *)((ptrdiff_t)p + offset));
+}
+
+static inline u32 *emac_gaht_base(struct emac_instance *dev)
+{
+	/* GAHT registers always come after an identical number of
+	 * IAHT registers.
+	 */
+	return (emac_xaht_base(dev) + EMAC_XAHT_REGS(dev));
+}
+
+static inline u32 *emac_iaht_base(struct emac_instance *dev)
+{
+	/* IAHT registers always come before an identical number of
+	 * GAHT registers.
+	 */
+	return (emac_xaht_base(dev));
+}
 
 /* Ethtool get_regs complex data.
  * We want to get not just EMAC registers, but also MAL, ZMII, RGMII, TAH
@@ -366,4 +440,11 @@
 	u32 index;
 };
 
+#define EMAC_ETHTOOL_REGS_VER		0
+#define EMAC_ETHTOOL_REGS_SIZE(dev) 	((dev)->rsrc_regs.end - \
+					 (dev)->rsrc_regs.start + 1)
+#define EMAC4_ETHTOOL_REGS_VER      	1
+#define EMAC4_ETHTOOL_REGS_SIZE(dev)	((dev)->rsrc_regs.end -	\
+					 (dev)->rsrc_regs.start + 1)
+
 #endif /* __IBM_NEWEMAC_CORE_H */
diff --git a/drivers/net/ibm_newemac/debug.c b/drivers/net/ibm_newemac/debug.c
index 86b756a..775c850 100644
--- a/drivers/net/ibm_newemac/debug.c
+++ b/drivers/net/ibm_newemac/debug.c
@@ -67,29 +67,55 @@
 static void emac_mac_dump(struct emac_instance *dev)
 {
 	struct emac_regs __iomem *p = dev->emacp;
+	const int xaht_regs = EMAC_XAHT_REGS(dev);
+	u32 *gaht_base = emac_gaht_base(dev);
+	u32 *iaht_base = emac_iaht_base(dev);
+	int emac4sync = emac_has_feature(dev, EMAC_FTR_EMAC4SYNC);
+	int n;
 
 	printk("** EMAC %s registers **\n"
 	       "MR0 = 0x%08x MR1 = 0x%08x TMR0 = 0x%08x TMR1 = 0x%08x\n"
 	       "RMR = 0x%08x ISR = 0x%08x ISER = 0x%08x\n"
-	       "IAR = %04x%08x VTPID = 0x%04x VTCI = 0x%04x\n"
-	       "IAHT: 0x%04x 0x%04x 0x%04x 0x%04x "
-	       "GAHT: 0x%04x 0x%04x 0x%04x 0x%04x\n"
-	       "LSA = %04x%08x IPGVR = 0x%04x\n"
-	       "STACR = 0x%08x TRTR = 0x%08x RWMR = 0x%08x\n"
-	       "OCTX = 0x%08x OCRX = 0x%08x IPCR = 0x%08x\n",
+	       "IAR = %04x%08x VTPID = 0x%04x VTCI = 0x%04x\n",
 	       dev->ofdev->node->full_name, in_be32(&p->mr0), in_be32(&p->mr1),
 	       in_be32(&p->tmr0), in_be32(&p->tmr1),
 	       in_be32(&p->rmr), in_be32(&p->isr), in_be32(&p->iser),
 	       in_be32(&p->iahr), in_be32(&p->ialr), in_be32(&p->vtpid),
-	       in_be32(&p->vtci),
-	       in_be32(&p->iaht1), in_be32(&p->iaht2), in_be32(&p->iaht3),
-	       in_be32(&p->iaht4),
-	       in_be32(&p->gaht1), in_be32(&p->gaht2), in_be32(&p->gaht3),
-	       in_be32(&p->gaht4),
+	       in_be32(&p->vtci)
+	       );
+
+	if (emac4sync)
+		printk("MAR = %04x%08x MMAR = %04x%08x\n",
+		       in_be32(&p->u0.emac4sync.mahr),
+		       in_be32(&p->u0.emac4sync.malr),
+		       in_be32(&p->u0.emac4sync.mmahr),
+		       in_be32(&p->u0.emac4sync.mmalr)
+		       );
+
+	for (n = 0; n < xaht_regs; n++)
+		printk("IAHT%02d = 0x%08x\n", n + 1, in_be32(iaht_base + n));
+
+	for (n = 0; n < xaht_regs; n++)
+		printk("GAHT%02d = 0x%08x\n", n + 1, in_be32(gaht_base + n));
+
+	printk("LSA = %04x%08x IPGVR = 0x%04x\n"
+	       "STACR = 0x%08x TRTR = 0x%08x RWMR = 0x%08x\n"
+	       "OCTX = 0x%08x OCRX = 0x%08x\n",
 	       in_be32(&p->lsah), in_be32(&p->lsal), in_be32(&p->ipgvr),
 	       in_be32(&p->stacr), in_be32(&p->trtr), in_be32(&p->rwmr),
-	       in_be32(&p->octx), in_be32(&p->ocrx), in_be32(&p->ipcr)
-	    );
+	       in_be32(&p->octx), in_be32(&p->ocrx)
+	       );
+
+	if (!emac4sync) {
+		printk("IPCR = 0x%08x\n",
+		       in_be32(&p->u1.emac4.ipcr)
+		       );
+	} else {
+		printk("REVID = 0x%08x TPC = 0x%08x\n",
+		       in_be32(&p->u1.emac4sync.revid),
+		       in_be32(&p->u1.emac4sync.tpc)
+		       );
+	}
 
 	emac_desc_dump(dev);
 }
diff --git a/drivers/net/ibm_newemac/emac.h b/drivers/net/ibm_newemac/emac.h
index 91cb096..0afc2cf 100644
--- a/drivers/net/ibm_newemac/emac.h
+++ b/drivers/net/ibm_newemac/emac.h
@@ -27,37 +27,80 @@
 
 #include <linux/types.h>
 
-/* EMAC registers 		Write Access rules */
+/* EMAC registers 			Write Access rules */
 struct emac_regs {
-	u32 mr0;		/* special 	*/
-	u32 mr1;		/* Reset 	*/
-	u32 tmr0;		/* special 	*/
-	u32 tmr1;		/* special 	*/
-	u32 rmr;		/* Reset 	*/
-	u32 isr;		/* Always 	*/
-	u32 iser;		/* Reset 	*/
-	u32 iahr;		/* Reset, R, T 	*/
-	u32 ialr;		/* Reset, R, T 	*/
-	u32 vtpid;		/* Reset, R, T 	*/
-	u32 vtci;		/* Reset, R, T 	*/
-	u32 ptr;		/* Reset,    T 	*/
-	u32 iaht1;		/* Reset, R	*/
-	u32 iaht2;		/* Reset, R	*/
-	u32 iaht3;		/* Reset, R	*/
-	u32 iaht4;		/* Reset, R	*/
-	u32 gaht1;		/* Reset, R	*/
-	u32 gaht2;		/* Reset, R	*/
-	u32 gaht3;		/* Reset, R	*/
-	u32 gaht4;		/* Reset, R	*/
+	/* Common registers across all EMAC implementations. */
+	u32 mr0;			/* Special 	*/
+	u32 mr1;			/* Reset 	*/
+	u32 tmr0;			/* Special 	*/
+	u32 tmr1;			/* Special 	*/
+	u32 rmr;			/* Reset 	*/
+	u32 isr;			/* Always 	*/
+	u32 iser;			/* Reset 	*/
+	u32 iahr;			/* Reset, R, T 	*/
+	u32 ialr;			/* Reset, R, T 	*/
+	u32 vtpid;			/* Reset, R, T 	*/
+	u32 vtci;			/* Reset, R, T 	*/
+	u32 ptr;			/* Reset,    T 	*/
+	union {
+		/* Registers unique to EMAC4 implementations */
+		struct {
+			u32 iaht1;	/* Reset, R	*/
+			u32 iaht2;	/* Reset, R	*/
+			u32 iaht3;	/* Reset, R	*/
+			u32 iaht4;	/* Reset, R	*/
+			u32 gaht1;	/* Reset, R	*/
+			u32 gaht2;	/* Reset, R	*/
+			u32 gaht3;	/* Reset, R	*/
+			u32 gaht4;	/* Reset, R	*/
+		} emac4;
+		/* Registers unique to EMAC4SYNC implementations */
+		struct {
+			u32 mahr;	/* Reset, R, T  */
+			u32 malr;	/* Reset, R, T  */
+			u32 mmahr;	/* Reset, R, T  */
+			u32 mmalr;	/* Reset, R, T  */
+			u32 rsvd0[4];
+		} emac4sync;
+	} u0;
+	/* Common registers across all EMAC implementations. */
 	u32 lsah;
 	u32 lsal;
-	u32 ipgvr;		/* Reset,    T 	*/
-	u32 stacr;		/* special 	*/
-	u32 trtr;		/* special 	*/
-	u32 rwmr;		/* Reset 	*/
+	u32 ipgvr;			/* Reset,    T 	*/
+	u32 stacr;			/* Special 	*/
+	u32 trtr;			/* Special 	*/
+	u32 rwmr;			/* Reset 	*/
 	u32 octx;
 	u32 ocrx;
-	u32 ipcr;
+	union {
+		/* Registers unique to EMAC4 implementations */
+		struct {
+			u32 ipcr;
+		} emac4;
+		/* Registers unique to EMAC4SYNC implementations */
+		struct {
+			u32 rsvd1;
+			u32 revid;
+ 			u32 rsvd2[2];
+			u32 iaht1;	/* Reset, R     */
+			u32 iaht2;	/* Reset, R     */
+			u32 iaht3;	/* Reset, R     */
+			u32 iaht4;	/* Reset, R     */
+			u32 iaht5;	/* Reset, R     */
+			u32 iaht6;	/* Reset, R     */
+			u32 iaht7;	/* Reset, R     */
+			u32 iaht8;	/* Reset, R     */
+			u32 gaht1;	/* Reset, R     */
+			u32 gaht2;	/* Reset, R     */
+			u32 gaht3;	/* Reset, R     */
+			u32 gaht4;	/* Reset, R     */
+			u32 gaht5;	/* Reset, R     */
+			u32 gaht6;	/* Reset, R     */
+			u32 gaht7;	/* Reset, R     */
+			u32 gaht8;	/* Reset, R     */
+			u32 tpc;	/* Reset, T     */
+		} emac4sync;
+	} u1;
 };
 
 /*
@@ -73,12 +116,6 @@
 #define PHY_MODE_RTBI	7
 #define PHY_MODE_SGMII	8
 
-
-#define EMAC_ETHTOOL_REGS_VER		0
-#define EMAC_ETHTOOL_REGS_SIZE		(sizeof(struct emac_regs) - sizeof(u32))
-#define EMAC4_ETHTOOL_REGS_VER      	1
-#define EMAC4_ETHTOOL_REGS_SIZE		sizeof(struct emac_regs)
-
 /* EMACx_MR0 */
 #define EMAC_MR0_RXI			0x80000000
 #define EMAC_MR0_TXI			0x40000000