diff -r e8067e7e46f8 usr/src/uts/common/io/rge/rge_chip.c
--- a/usr/src/uts/common/io/rge/rge_chip.c	Mon Aug 11 14:18:16 2008 -0700
+++ b/usr/src/uts/common/io/rge/rge_chip.c	Mon Aug 18 19:09:43 2008 +0200
@@ -894,6 +894,7 @@
 		val16 = rge_reg_get8(rgep, PHY_STATUS_REG);
 		val16 = 0x12<<8 | val16;
 		if (rgep->chipid.mac_ver != MAC_VER_8101E &&
+		    rgep->chipid.mac_ver != MAC_VER_8101E_X &&
 		    rgep->chipid.mac_ver != MAC_VER_8168B_C) {
 			rge_reg_put16(rgep, PHY_STATUS_REG, val16);
 			rge_reg_put32(rgep, RT_CSI_DATA_REG, 0x00021c01);
diff -r e8067e7e46f8 usr/src/uts/common/io/rge/rge_hw.h
--- a/usr/src/uts/common/io/rge/rge_hw.h	Mon Aug 11 14:18:16 2008 -0700
+++ b/usr/src/uts/common/io/rge/rge_hw.h	Mon Aug 18 19:09:43 2008 +0200
@@ -171,6 +171,7 @@
 #define	MAC_VER_8168B_B			0x30000000
 #define	MAC_VER_8168B_C			0x38000000
 #define	MAC_VER_8101E			0x34000000
+#define	MAC_VER_8101E_X			0x34800000
 
 #define	TX_CONFIG_DEFAULT		(TX_INTERFRAME_GAP_802_3 | \
 					    TX_DMA_BURST_1024B)
diff -r e8067e7e46f8 usr/src/uts/common/io/rge/rge_main.c
--- a/usr/src/uts/common/io/rge/rge_main.c	Mon Aug 11 14:18:16 2008 -0700
+++ b/usr/src/uts/common/io/rge/rge_main.c	Mon Aug 18 19:09:43 2008 +0200
@@ -1278,10 +1278,16 @@
 static boolean_t
 rge_m_getcapab(void *arg, mac_capab_t cap, void *cap_data)
 {
+	rge_t *rgep = arg;
+
 	switch (cap) {
 	case MAC_CAPAB_HCKSUM: {
 		uint32_t *hcksum_txflags = cap_data;
-		*hcksum_txflags = HCKSUM_INET_FULL_V4 | HCKSUM_IPHDRCKSUM;
+		if (rgep->chipid.mac_ver == MAC_VER_8101E_X)
+			*hcksum_txflags = 0;
+		else
+			*hcksum_txflags = HCKSUM_INET_FULL_V4 | \
+			    HCKSUM_IPHDRCKSUM;
 		break;
 	}
 	case MAC_CAPAB_POLL: