diff --git a/src/northbridge/intel/x4x/raminit.c b/src/northbridge/intel/x4x/raminit.c
index efd197f..9e649b0 100644
--- a/src/northbridge/intel/x4x/raminit.c
+++ b/src/northbridge/intel/x4x/raminit.c
@@ -408,6 +408,9 @@
 
 	s->dimms[dimm_idx].spd_crc = spd_ddr3_calc_unique_crc(raw_spd,
 							raw_spd[0]);
+
+	s->dimms[dimm_idx].mirrored = decoded_dimm.flags.pins_mirrored;
+
 	return CB_SUCCESS;
 }
 
diff --git a/src/northbridge/intel/x4x/raminit_ddr23.c b/src/northbridge/intel/x4x/raminit_ddr23.c
index e4cdcd2..6d6111c 100644
--- a/src/northbridge/intel/x4x/raminit_ddr23.c
+++ b/src/northbridge/intel/x4x/raminit_ddr23.c
@@ -1347,14 +1347,45 @@
 	return channel * 512 * MiB + rank * 128 * MiB;
 }
 
-static void dojedec_ddr2(u8 r, u8 ch, u8 cmd, u16 val)
+
+/* DDR3 Rank1 Address mirror
+ * swap the following pins:
+ * A3<->A4, A5<->A6, A7<->A8, BA0<->BA1 */
+static u32 mirror_shift_bit(const u32 data, u8 bit)
+{
+	u32 temp0 = data, temp1 = data;
+	temp0 &= 1 << bit;
+	temp0 <<= 1;
+	temp1 &= 1 << (bit + 1);
+	temp1 >>= 1;
+	return (data & ~(3 << bit)) | temp0 | temp1;
+}
+
+static void send_jedec_cmd(const struct sysinfo *s, u8 r,
+			u8 ch, u8 cmd, u32 val)
 {
 	u32 addr = test_address(ch, r);
 	volatile u32 rubbish;
+	u8 data8 = cmd;
+	u32 data32;
 
-	MCHBAR8(0x271) = (MCHBAR8(0x271) & ~0x3e) | cmd;
-	MCHBAR8(0x671) = (MCHBAR8(0x671) & ~0x3e) | cmd;
-	rubbish = read32((void *)((val<<3) | addr));
+	if (s->spd_type == DDR3 && (r & 1)
+			&& s->dimms[ch * 2 + (r >> 1)].mirrored) {
+		data8 = (u8)mirror_shift_bit(data8, 4);
+	}
+
+	MCHBAR8(0x271) = (MCHBAR8(0x271) & ~0x3e) | data8;
+	MCHBAR8(0x671) = (MCHBAR8(0x671) & ~0x3e) | data8;
+	data32 = val;
+	if (s->spd_type == DDR3 && (r & 1)
+			&& s->dimms[ch * 2 + (r >> 1)].mirrored) {
+		data32 = mirror_shift_bit(data32, 3);
+		data32 = mirror_shift_bit(data32, 5);
+		data32 = mirror_shift_bit(data32, 7);
+	}
+	data32 <<= 3;
+
+	rubbish = read32((void *)((data32 | addr)));
 	udelay(10);
 	MCHBAR8(0x271) = (MCHBAR8(0x271) & ~0x3e) | NORMALOP_CMD;
 	MCHBAR8(0x671) = (MCHBAR8(0x671) & ~0x3e) | NORMALOP_CMD;
@@ -1419,7 +1450,7 @@
 			default:
 				break;
 			}
-			dojedec_ddr2(r, ch, jedec[i][0], v);
+			send_jedec_cmd(s, r, ch, jedec[i][0], v);
 			udelay(1);
 			printk(RAM_SPEW, "Jedec step %d\n", i);
 		}
@@ -1427,6 +1458,55 @@
 	printk(BIOS_DEBUG, "MRS done\n");
 }
 
+static void jedec_ddr3(struct sysinfo *s)
+{
+	int ch, r, dimmconfig, cmd, ddr3_freq;
+
+	u8 ddr3_emrs2_rtt_wr_config[16][4] = { /* [config][Rank] */
+		{0, 0, 0, 0},	/* NC_NC */
+		{0, 0, 0, 0},	/* x8ss_NC */
+		{0, 0, 0, 0},	/* x8ds_NC */
+		{0, 0, 0, 0},	/* x16ss_NC */
+		{0, 0, 0, 0},	/* NC_x8ss */
+		{2, 0, 2, 0},	/* x8ss_x8ss */
+		{2, 2, 2, 0},	/* x8ds_x8ss */
+		{2, 0, 2, 0},	/* x16ss_x8ss */
+		{0, 0, 0, 0},	/* NC_x8ss */
+		{2, 0, 2, 2},	/* x8ss_x8ds */
+		{2, 2, 2, 2},	/* x8ds_x8ds */
+		{2, 0, 2, 2},	/* x16ss_x8ds */
+		{0, 0, 0, 0},	/* NC_x16ss */
+		{2, 0, 2, 0},	/* x8ss_x16ss */
+		{2, 2, 2, 0},	/* x8ds_x16ss */
+		{2, 0, 2, 0},	/* x16ss_x16ss */
+	};
+
+	printk(BIOS_DEBUG, "MRS...\n");
+
+	ddr3_freq = s->selected_timings.mem_clk - MEM_CLOCK_800MHz;
+	FOR_EACH_POPULATED_RANK(s->dimms, ch, r) {
+		printk(BIOS_DEBUG, "CH%d: Found Rank %d\n", ch, r);
+		send_jedec_cmd(s, r, ch, NOP_CMD, 0);
+		udelay(200);
+		dimmconfig = s->dimm_config[ch];
+		cmd = ddr3_freq << 3; /* actually twl - 5 which is same */
+		cmd |= ddr3_emrs2_rtt_wr_config[dimmconfig][r] << 9;
+		send_jedec_cmd(s, r, ch, EMRS2_CMD, cmd);
+		send_jedec_cmd(s, r, ch, EMRS3_CMD, 0);
+		cmd = ddr3_emrs1_rtt_nom_config[dimmconfig][r] << 2;
+		/* Hardcode output drive strength to 34 Ohm / RZQ/7 (why??) */
+		cmd |= (1 << 1);
+		send_jedec_cmd(s, r, ch, EMRS1_CMD, cmd);
+		/* Burst type interleaved, burst length 8, Reset DLL,
+		 * Precharge PD: DLL on */
+		send_jedec_cmd(s, r, ch, MRS_CMD, (1 << 3) | (1 << 8)
+			| (1 << 12) | ((s->selected_timings.CAS - 4) << 4)
+			| ((s->selected_timings.tWR - 4) << 9));
+		send_jedec_cmd(s, r, ch, ZQCAL_CMD, (1 << 10));
+	}
+	printk(BIOS_DEBUG, "MRS done\n");
+}
+
 static void sdram_recover_receive_enable(const struct sysinfo *s)
 {
 	u32 reg32;
@@ -1949,8 +2029,12 @@
 	printk(BIOS_DEBUG, "Done pre-jedec\n");
 
 	// JEDEC reset
-	if (s->boot_path != BOOT_PATH_RESUME)
-		jedec_ddr2(s);
+	if (s->boot_path != BOOT_PATH_RESUME) {
+		if (s->spd_type == DDR2)
+			jedec_ddr2(s);
+		else /* DDR3 */
+			jedec_ddr3(s);
+	}
 
 	printk(BIOS_DEBUG, "Done jedec steps\n");
 
diff --git a/src/northbridge/intel/x4x/raminit_tables.c b/src/northbridge/intel/x4x/raminit_tables.c
index 9a39b28..47d8a98 100644
--- a/src/northbridge/intel/x4x/raminit_tables.c
+++ b/src/northbridge/intel/x4x/raminit_tables.c
@@ -269,3 +269,22 @@
 		{13, 6, 1, 0, 1, 0},
 		{0, 3, 1, 1, 0, 1}, }
 };
+
+const u8 ddr3_emrs1_rtt_nom_config[16][4] = {  /* [Config][Rank] */
+	{0x00, 0x00, 0x00, 0x00},	/* NC_NC */
+	{0x11, 0x00, 0x00, 0x00},	/* 8S_NC */
+	{0x11, 0x11, 0x00, 0x00},	/* 8D_NC */
+	{0x11, 0x00, 0x00, 0x00},	/* 16S_NC */
+	{0x00, 0x00, 0x11, 0x00},	/* NC_8S */
+	{0x81, 0x00, 0x81, 0x00},	/* 8S_8S */
+	{0x81, 0x81, 0x81, 0x00},	/* 8D_8S */
+	{0x81, 0x00, 0x81, 0x00},	/* 16S_8S */
+	{0x00, 0x00, 0x11, 0x11},	/* NC_8D */
+	{0x81, 0x00, 0x81, 0x81},	/* 8S_8D */
+	{0x81, 0x81, 0x81, 0x81},	/* 8D_8D */
+	{0x81, 0x00, 0x81, 0x81},	/* 16S_8D */
+	{0x00, 0x00, 0x11, 0x00},	/* NC_16S */
+	{0x81, 0x00, 0x81, 0x00},	/* 8S_16S */
+	{0x81, 0x81, 0x81, 0x00},	/* 8D_16S */
+	{0x81, 0x00, 0x81, 0x00},	/* 16S_16S */
+};
diff --git a/src/northbridge/intel/x4x/x4x.h b/src/northbridge/intel/x4x/x4x.h
index 8532d60..53b73ae 100644
--- a/src/northbridge/intel/x4x/x4x.h
+++ b/src/northbridge/intel/x4x/x4x.h
@@ -309,6 +309,7 @@
 	unsigned int	rows;
 	unsigned int	cols;
 	u16             spd_crc;
+	u8		mirrored;
 };
 
 struct rcven_timings {
@@ -388,6 +389,7 @@
 extern const struct dll_setting default_ddr3_800_dq[2][TOTAL_BYTELANES];
 extern const struct dll_setting default_ddr3_1067_dq[2][TOTAL_BYTELANES];
 extern const struct dll_setting default_ddr3_1333_dq[2][TOTAL_BYTELANES];
+extern const u8 ddr3_emrs1_rtt_nom_config[16][4];
 
 struct acpi_rsdp;
 #ifndef __SIMPLE_DEVICE__