diff --git a/src/northbridge/intel/sandybridge/raminit_common.c b/src/northbridge/intel/sandybridge/raminit_common.c
index 8964e3f..8165dc1 100644
--- a/src/northbridge/intel/sandybridge/raminit_common.c
+++ b/src/northbridge/intel/sandybridge/raminit_common.c
@@ -72,10 +72,10 @@
 
 static void toggle_io_reset(void) {
 	/* toggle IO reset bit */
-	u32 r32 = read32(DEFAULT_MCHBAR + 0x5030);
-	write32(DEFAULT_MCHBAR + 0x5030, r32 | 0x20);
+	u32 r32 = MCHBAR32(0x5030);
+	MCHBAR32(0x5030) = r32 | 0x20;
 	udelay(1);
-	write32(DEFAULT_MCHBAR + 0x5030, r32 & ~0x20);
+	MCHBAR32(0x5030) = r32 & ~0x20;
 	udelay(1);
 }
 
@@ -623,7 +623,7 @@
 static void wait_428c(int channel)
 {
 	while (1) {
-		if (read32(DEFAULT_MCHBAR + 0x428c + (channel << 10)) & 0x50)
+		if (MCHBAR32(0x428c + (channel << 10)) & 0x50)
 			return;
 	}
 }
@@ -641,15 +641,14 @@
 	slotrank = (ctrl->rankmap[channel] & 1) ? 0 : 2;
 
 	/* DRAM command ZQCS */
-	write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x0f003);
-	write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel, 0x80c01);
+	MCHBAR32(0x4220 + 0x400 * channel) = 0x0f003;
+	MCHBAR32(0x4230 + 0x400 * channel) = 0x80c01;
 
-	write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-		(slotrank << 24) | 0x60000);
+	MCHBAR32(0x4200 + 0x400 * channel) = (slotrank << 24) | 0x60000;
 
-	write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0);
+	MCHBAR32(0x4210 + 0x400 * channel) = 0;
 
-	write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 0x400001);
+	MCHBAR32(0x4284 + 0x400 * channel) = 0x400001;
 	wait_428c(channel);
 }
 
@@ -736,27 +735,26 @@
 	}
 
 	/* DRAM command MRS */
-	write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x0f000);
-	write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel, 0x41001);
-	write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-		(slotrank << 24) | (reg << 20) | val | 0x60000);
-	write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0);
+	MCHBAR32(0x4220 + 0x400 * channel) = 0x0f000;
+	MCHBAR32(0x4230 + 0x400 * channel) = 0x41001;
+	MCHBAR32(0x4200 + 0x400 * channel) =
+		(slotrank << 24) | (reg << 20) | val | 0x60000;
+	MCHBAR32(0x4210 + 0x400 * channel) = 0;
 
 	/* DRAM command MRS */
-	write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel, 0x1f000);
-	write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel, 0x41001);
-	write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-		(slotrank << 24) | (reg << 20) | val | 0x60000);
-	write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0);
+	MCHBAR32(0x4224 + 0x400 * channel) = 0x1f000;
+	MCHBAR32(0x4234 + 0x400 * channel) = 0x41001;
+	MCHBAR32(0x4204 + 0x400 * channel) =
+		(slotrank << 24) | (reg << 20) | val | 0x60000;
+	MCHBAR32(0x4214 + 0x400 * channel) = 0;
 
 	/* DRAM command MRS */
-	write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel, 0x0f000);
-	write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel,
-		0x1001 | (ctrl->tMOD << 16));
-	write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel,
-		(slotrank << 24) | (reg << 20) | val | 0x60000);
-	write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel, 0);
-	write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 0x80001);
+	MCHBAR32(0x4228 + 0x400 * channel) = 0x0f000;
+	MCHBAR32(0x4238 + 0x400 * channel) = 0x1001 | (ctrl->tMOD << 16);
+	MCHBAR32(0x4208 + 0x400 * channel) =
+		(slotrank << 24) | (reg << 20) | val | 0x60000;
+	MCHBAR32(0x4218 + 0x400 * channel) = 0;
+	MCHBAR32(0x4284 + 0x400 * channel) = 0x80001;
 }
 
 static u32 make_mr0(ramctr_timing * ctrl, u8 rank)
@@ -790,8 +788,7 @@
 
 static void dram_mr0(ramctr_timing *ctrl, u8 rank, int channel)
 {
-	write_mrreg(ctrl, channel, rank, 0,
-				make_mr0(ctrl, rank));
+	write_mrreg(ctrl, channel, rank, 0, make_mr0(ctrl, rank));
 }
 
 static u32 encode_odt(u32 odt)
@@ -881,19 +878,19 @@
 	}
 
 	/* DRAM command NOP */
-	write32(DEFAULT_MCHBAR + 0x4e20, 0x7);
-	write32(DEFAULT_MCHBAR + 0x4e30, 0xf1001);
-	write32(DEFAULT_MCHBAR + 0x4e00, 0x60002);
-	write32(DEFAULT_MCHBAR + 0x4e10, 0);
+	MCHBAR32(0x4e20) = 0x7;
+	MCHBAR32(0x4e30) = 0xf1001;
+	MCHBAR32(0x4e00) = 0x60002;
+	MCHBAR32(0x4e10) = 0;
 
 	/* DRAM command ZQCL */
-	write32(DEFAULT_MCHBAR + 0x4e24, 0x1f003);
-	write32(DEFAULT_MCHBAR + 0x4e34, 0x1901001);
-	write32(DEFAULT_MCHBAR + 0x4e04, 0x60400);
-	write32(DEFAULT_MCHBAR + 0x4e14, 0x288);
+	MCHBAR32(0x4e24) = 0x1f003;
+	MCHBAR32(0x4e34) = 0x1901001;
+	MCHBAR32(0x4e04) = 0x60400;
+	MCHBAR32(0x4e14) = 0x288;
 
 	/* execute command queue on all channels ? */
-	write32(DEFAULT_MCHBAR + 0x4e84, 0x40004);
+	MCHBAR32(0x4e84) = 0x40004;
 
 	// Drain
 	FOR_ALL_CHANNELS {
@@ -918,12 +915,12 @@
 		wait_428c(channel);
 
 		/* DRAM command ZQCS */
-		write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x0f003);
-		write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel, 0x659001);
-		write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-			(slotrank << 24) | 0x60000);
-		write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0x3e0);
-		write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 0x1);
+		MCHBAR32(0x4220 + 0x400 * channel) = 0x0f003;
+		MCHBAR32(0x4230 + 0x400 * channel) = 0x659001;
+		MCHBAR32(0x4200 + 0x400 * channel) =
+			(slotrank << 24) | 0x60000;
+		MCHBAR32(0x4210 + 0x400 * channel) = 0x3e0;
+		MCHBAR32(0x4284 + 0x400 * channel) = 0x1;
 
 		// Drain
 		wait_428c(channel);
@@ -968,8 +965,7 @@
 		case 3:
 			slot320c[slot] =
 			    (ctrl->timings[channel][2 * slot].val_320c +
-			     ctrl->timings[channel][2 * slot +
-						    1].val_320c) / 2 +
+			    ctrl->timings[channel][2 * slot + 1].val_320c) / 2 +
 			    full_shift;
 			break;
 		}
@@ -1089,37 +1085,31 @@
 	 * write MR3 MPR enable
 	 * in this mode only RD and RDA are allowed
 	 * all reads return a predefined pattern */
-	write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x1f000);
-	write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-		(0xc01 | (ctrl->tMOD << 16)));
-	write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-		(slotrank << 24) | 0x360004);
-	write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0);
+	MCHBAR32(0x4220 + 0x400 * channel) = 0x1f000;
+	MCHBAR32(0x4230 + 0x400 * channel) = (0xc01 | (ctrl->tMOD << 16));
+	MCHBAR32(0x4200 + 0x400 * channel) = (slotrank << 24) | 0x360004;
+	MCHBAR32(0x4210 + 0x400 * channel) = 0;
 
 	/* DRAM command RD */
-	write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel, 0x1f105);
-	write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel, 0x4040c01);
-	write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel, (slotrank << 24));
-	write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0);
+	MCHBAR32(0x4224 + 0x400 * channel) = 0x1f105;
+	MCHBAR32(0x4234 + 0x400 * channel) = 0x4040c01;
+	MCHBAR32(0x4204 + 0x400 * channel) = (slotrank << 24);
+	MCHBAR32(0x4214 + 0x400 * channel) = 0;
 
 	/* DRAM command RD */
-	write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel, 0x1f105);
-	write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel,
-		0x100f | ((ctrl->CAS + 36) << 16));
-	write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel,
-		(slotrank << 24) | 0x60000);
-	write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel, 0);
+	MCHBAR32(0x4228 + 0x400 * channel) = 0x1f105;
+	MCHBAR32(0x4238 + 0x400 * channel) = 0x100f | ((ctrl->CAS + 36) << 16);
+	MCHBAR32(0x4208 + 0x400 * channel) = (slotrank << 24) | 0x60000;
+	MCHBAR32(0x4218 + 0x400 * channel) = 0;
 
 	/* DRAM command MRS
 	 * write MR3 MPR disable */
-	write32(DEFAULT_MCHBAR + 0x422c + 0x400 * channel, 0x1f000);
-	write32(DEFAULT_MCHBAR + 0x423c + 0x400 * channel,
-		(0xc01 | (ctrl->tMOD << 16)));
-	write32(DEFAULT_MCHBAR + 0x420c + 0x400 * channel,
-		(slotrank << 24) | 0x360000);
-	write32(DEFAULT_MCHBAR + 0x421c + 0x400 * channel, 0);
+	MCHBAR32(0x422c + 0x400 * channel) = 0x1f000;
+	MCHBAR32(0x423c + 0x400 * channel) = 0xc01 | (ctrl->tMOD << 16);
+	MCHBAR32(0x420c + 0x400 * channel) = (slotrank << 24) | 0x360000;
+	MCHBAR32(0x421c + 0x400 * channel) = 0;
 
-	write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 0xc0001);
+	MCHBAR32(0x4284 + 0x400 * channel) = 0xc0001;
 
 	wait_428c(channel);
 }
@@ -1128,8 +1118,7 @@
 			  int lane)
 {
 	u32 timA = ctrl->timings[channel][slotrank].lanes[lane].timA;
-	return ((read32
-		 (DEFAULT_MCHBAR + lane_registers[lane] + channel * 0x100 + 4 +
+	return ((MCHBAR32(lane_registers[lane] + channel * 0x100 + 4 +
 		  ((timA / 32) & 1) * 4)
 		 >> (timA % 32)) & 1);
 }
@@ -1201,7 +1190,7 @@
 		if (upperA[lane] < rn.middle)
 			upperA[lane] += 128;
 		printram("timA: %d, %d, %d: 0x%02x-0x%02x-0x%02x\n",
-				 channel, slotrank, lane, rn.start, rn.middle, rn.end);
+			 channel, slotrank, lane, rn.start, rn.middle, rn.end);
 	}
 }
 
@@ -1223,8 +1212,8 @@
 			test_timA(ctrl, channel, slotrank);
 			FOR_ALL_LANES {
 				statistics[lane][timA_delta + 25] +=
-				    does_lane_work(ctrl, channel, slotrank,
-						   lane);
+					does_lane_work(ctrl, channel, slotrank,
+						lane);
 			}
 		}
 	}
@@ -1372,34 +1361,32 @@
 		int upperA[NUM_LANES];
 		struct timA_minmax mnmx;
 
-		 wait_428c(channel);
+		wait_428c(channel);
 
-		 /* DRAM command PREA */
-		 write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x1f002);
-		 write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-			 0xc01 | (ctrl->tRP << 16));
-		 write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-			 (slotrank << 24) | 0x60400);
-		 write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0);
-		 write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 1);
+		/* DRAM command PREA */
+		MCHBAR32(0x4220 + 0x400 * channel) = 0x1f002;
+		MCHBAR32(0x4230 + 0x400 * channel) = 0xc01 | (ctrl->tRP << 16);
+		MCHBAR32(0x4200 + 0x400 * channel) = (slotrank << 24) | 0x60400;
+		MCHBAR32(0x4210 + 0x400 * channel) = 0;
+		MCHBAR32(0x4284 + 0x400 * channel) = 1;
 
-		 write32(DEFAULT_MCHBAR + 0x3400, (slotrank << 2) | 0x8001);
+		MCHBAR32(0x3400) = (slotrank << 2) | 0x8001;
 
-		 ctrl->timings[channel][slotrank].val_4028 = 4;
-		 ctrl->timings[channel][slotrank].val_4024 = 55;
-		 program_timings(ctrl, channel);
+		ctrl->timings[channel][slotrank].val_4028 = 4;
+		ctrl->timings[channel][slotrank].val_4024 = 55;
+		program_timings(ctrl, channel);
 
-		 discover_timA_coarse(ctrl, channel, slotrank, upperA);
+		discover_timA_coarse(ctrl, channel, slotrank, upperA);
 
-		 all_high = 1;
-		 some_high = 0;
-		 FOR_ALL_LANES {
-			 if (ctrl->timings[channel][slotrank].lanes[lane].
-			     timA >= 0x40)
-				 some_high = 1;
-			 else
-				 all_high = 0;
-		 }
+		all_high = 1;
+		some_high = 0;
+		FOR_ALL_LANES {
+			if (ctrl->timings[channel][slotrank].lanes[lane].timA >=
+			    0x40)
+				some_high = 1;
+			else
+				all_high = 0;
+		}
 
 		if (all_high) {
 			ctrl->timings[channel][slotrank].val_4028--;
@@ -1447,11 +1434,11 @@
 
 		printram("final results:\n");
 		FOR_ALL_LANES
-		    printram("Aval: %d, %d, %d: %x\n", channel, slotrank,
-			   lane,
-			   ctrl->timings[channel][slotrank].lanes[lane].timA);
+			printram("Aval: %d, %d, %d: %x\n", channel, slotrank,
+			    lane,
+			    ctrl->timings[channel][slotrank].lanes[lane].timA);
 
-		write32(DEFAULT_MCHBAR + 0x3400, 0);
+		MCHBAR32(0x3400) = 0;
 
 		toggle_io_reset();
 	}
@@ -1460,8 +1447,7 @@
 		program_timings(ctrl, channel);
 	}
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS FOR_ALL_LANES {
-		write32(DEFAULT_MCHBAR + 0x4080 + 0x400 * channel
-			+ 4 * lane, 0);
+		MCHBAR32(0x4080 + 0x400 * channel + 4 * lane) = 0;
 	}
 	return 0;
 }
@@ -1471,82 +1457,75 @@
 	int lane;
 
 	FOR_ALL_LANES {
-		write32(DEFAULT_MCHBAR + 0x4340 + 0x400 * channel + 4 * lane, 0);
-		read32(DEFAULT_MCHBAR + 0x4140 + 0x400 * channel + 4 * lane);
+		volatile u32 tmp;
+		MCHBAR32(0x4340 + 0x400 * channel + 4 * lane) = 0;
+		tmp = MCHBAR32(0x4140 + 0x400 * channel + 4 * lane);
 	}
 
 	wait_428c(channel);
 
 	/* DRAM command ACT */
-	write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x1f006);
-	write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
+	MCHBAR32(0x4220 + 0x400 * channel) = 0x1f006;
+	MCHBAR32(0x4230 + 0x400 * channel) =
 		(max((ctrl->tFAW >> 2) + 1, ctrl->tRRD) << 10)
-		| 4 | (ctrl->tRCD << 16));
+		| 4 | (ctrl->tRCD << 16);
 
-	write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-		(slotrank << 24) | (6 << 16));
+	MCHBAR32(0x4200 + 0x400 * channel) = (slotrank << 24) | (6 << 16);
 
-	write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0x244);
+	MCHBAR32(0x4210 + 0x400 * channel) = 0x244;
 
 	/* DRAM command NOP */
-	write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel, 0x1f207);
-	write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel, 0x8041001);
-	write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-		(slotrank << 24) | 8);
-	write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0x3e0);
+	MCHBAR32(0x4224 + 0x400 * channel) = 0x1f207;
+	MCHBAR32(0x4234 + 0x400 * channel) = 0x8041001;
+	MCHBAR32(0x4204 + 0x400 * channel) = (slotrank << 24) | 8;
+	MCHBAR32(0x4214 + 0x400 * channel) = 0x3e0;
 
 	/* DRAM command WR */
-	write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel, 0x1f201);
-	write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel, 0x80411f4);
-	write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel, (slotrank << 24));
-	write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel, 0x242);
+	MCHBAR32(0x4228 + 0x400 * channel) = 0x1f201;
+	MCHBAR32(0x4238 + 0x400 * channel) = 0x80411f4;
+	MCHBAR32(0x4208 + 0x400 * channel) = slotrank << 24;
+	MCHBAR32(0x4218 + 0x400 * channel) = 0x242;
 
 	/* DRAM command NOP */
-	write32(DEFAULT_MCHBAR + 0x422c + 0x400 * channel, 0x1f207);
-	write32(DEFAULT_MCHBAR + 0x423c + 0x400 * channel,
-		0x8000c01 | ((ctrl->CWL + ctrl->tWTR + 5) << 16));
-	write32(DEFAULT_MCHBAR + 0x420c + 0x400 * channel,
-		(slotrank << 24) | 8);
-	write32(DEFAULT_MCHBAR + 0x421c + 0x400 * channel, 0x3e0);
+	MCHBAR32(0x422c + 0x400 * channel) = 0x1f207;
+	MCHBAR32(0x423c + 0x400 * channel) =
+		0x8000c01 | ((ctrl->CWL + ctrl->tWTR + 5) << 16);
+	MCHBAR32(0x420c + 0x400 * channel) = (slotrank << 24) | 8;
+	MCHBAR32(0x421c + 0x400 * channel) = 0x3e0;
 
-	write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 0xc0001);
+	MCHBAR32(0x4284 + 0x400 * channel) = 0xc0001;
 
 	wait_428c(channel);
 
 	/* DRAM command PREA */
-	write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x1f002);
-	write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-		0xc01 | (ctrl->tRP << 16));
-	write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-		(slotrank << 24) | 0x60400);
-	write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0x240);
+	MCHBAR32(0x4220 + 0x400 * channel) = 0x1f002;
+	MCHBAR32(0x4230 + 0x400 * channel) = 0xc01 | (ctrl->tRP << 16);
+	MCHBAR32(0x4200 + 0x400 * channel) = (slotrank << 24) | 0x60400;
+	MCHBAR32(0x4210 + 0x400 * channel) = 0x240;
 
 	/* DRAM command ACT */
-	write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel, 0x1f006);
-	write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel,
+	MCHBAR32(0x4224 + 0x400 * channel) = 0x1f006;
+	MCHBAR32(0x4234 + 0x400 * channel) =
 		(max(ctrl->tRRD, (ctrl->tFAW >> 2) + 1) << 10)
-		| 8 | (ctrl->CAS << 16));
+		| 8 | (ctrl->CAS << 16);
 
-	write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-		(slotrank << 24) | 0x60000);
+	MCHBAR32(0x4204 + 0x400 * channel) = (slotrank << 24) | 0x60000;
 
-	write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0x244);
+	MCHBAR32(0x4214 + 0x400 * channel) = 0x244;
 
 	/* DRAM command RD */
-	write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel, 0x1f105);
-	write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel,
-		0x40011f4 | (max(ctrl->tRTP, 8) << 16));
-	write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel, (slotrank << 24));
-	write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel, 0x242);
+	MCHBAR32(0x4228 + 0x400 * channel) = 0x1f105;
+	MCHBAR32(0x4238 + 0x400 * channel) =
+		0x40011f4 | (max(ctrl->tRTP, 8) << 16);
+	MCHBAR32(0x4208 + 0x400 * channel) = (slotrank << 24);
+	MCHBAR32(0x4218 + 0x400 * channel) = 0x242;
 
 	/* DRAM command PREA */
-	write32(DEFAULT_MCHBAR + 0x422c + 0x400 * channel, 0x1f002);
-	write32(DEFAULT_MCHBAR + 0x423c + 0x400 * channel,
-		0xc01 | (ctrl->tRP << 16));
-	write32(DEFAULT_MCHBAR + 0x420c + 0x400 * channel,
-		(slotrank << 24) | 0x60400);
-	write32(DEFAULT_MCHBAR + 0x421c + 0x400 * channel, 0x240);
-	write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 0xc0001);
+	MCHBAR32(0x422c + 0x400 * channel) = 0x1f002;
+	MCHBAR32(0x423c + 0x400 * channel) = 0xc01 | (ctrl->tRP << 16);
+	MCHBAR32(0x420c + 0x400 * channel) = (slotrank << 24) | 0x60400;
+	MCHBAR32(0x421c + 0x400 * channel) = 0x240;
+	MCHBAR32(0x4284 + 0x400 * channel) = 0xc0001;
 	wait_428c(channel);
 }
 
@@ -1559,13 +1538,11 @@
 	wait_428c(channel);
 
 	/* DRAM command PREA */
-	write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x1f002);
-	write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-		0xc01 | (ctrl->tRP << 16));
-	write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-		(slotrank << 24) | 0x60400);
-	write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0x240);
-	write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 1);
+	MCHBAR32(0x4220 + 0x400 * channel) = 0x1f002;
+	MCHBAR32(0x4230 + 0x400 * channel) = 0xc01 | (ctrl->tRP << 16);
+	MCHBAR32(0x4200 + 0x400 * channel) =  (slotrank << 24) | 0x60400;
+	MCHBAR32(0x4210 + 0x400 * channel) = 0x240;
+	MCHBAR32(0x4284 + 0x400 * channel) = 1;
 
 	for (timC = 0; timC <= MAX_TIMC; timC++) {
 		FOR_ALL_LANES ctrl->timings[channel][slotrank].lanes[lane].
@@ -1576,8 +1553,7 @@
 
 		FOR_ALL_LANES {
 			statistics[lane][timC] =
-			    read32(DEFAULT_MCHBAR + 0x4340 + 4 * lane +
-				   0x400 * channel);
+				MCHBAR32(0x4340 + 4 * lane + 0x400 * channel);
 		}
 	}
 	FOR_ALL_LANES {
@@ -1590,7 +1566,7 @@
 			return MAKE_ERR;
 		}
 		printram("timC: %d, %d, %d: 0x%02x-0x%02x-0x%02x\n",
-				 channel, slotrank, lane, rn.start, rn.middle, rn.end);
+			channel, slotrank, lane, rn.start, rn.middle, rn.end);
 	}
 	return 0;
 }
@@ -1655,43 +1631,37 @@
 			 * write MR3 MPR enable
 			 * in this mode only RD and RDA are allowed
 			 * all reads return a predefined pattern */
-			write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel,
-				0x1f000);
-			write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-				0xc01 | (ctrl->tMOD << 16));
-			write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-				(slotrank << 24) | 0x360004);
-			write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0);
+			MCHBAR32(0x4220 + 0x400 * channel) = 0x1f000;
+			MCHBAR32(0x4230 + 0x400 * channel) =
+				0xc01 | (ctrl->tMOD << 16);
+			MCHBAR32(0x4200 + 0x400 * channel) =
+				(slotrank << 24) | 0x360004;
+			MCHBAR32(0x4210 + 0x400 * channel) = 0;
 
 			/* DRAM command RD */
-			write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel,
-				0x1f105);
-			write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel,
-				0x4041003);
-			write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-				(slotrank << 24) | 0);
-			write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0);
+			MCHBAR32(0x4224 + 0x400 * channel) = 0x1f105;
+			MCHBAR32(0x4234 + 0x400 * channel) = 0x4041003;
+			MCHBAR32(0x4204 + 0x400 * channel) =
+				(slotrank << 24) | 0;
+			MCHBAR32(0x4214 + 0x400 * channel) = 0;
 
 			/* DRAM command RD */
-			write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel,
-				0x1f105);
-			write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel,
-				0x1001 | ((ctrl->CAS + 8) << 16));
-			write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel,
-				(slotrank << 24) | 0x60000);
-			write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel, 0);
+			MCHBAR32(0x4228 + 0x400 * channel) = 0x1f105;
+			MCHBAR32(0x4238 + 0x400 * channel) =
+				0x1001 | ((ctrl->CAS + 8) << 16);
+			MCHBAR32(0x4208 + 0x400 * channel) =
+				(slotrank << 24) | 0x60000;
+			MCHBAR32(0x4218 + 0x400 * channel) = 0;
 
 			/* DRAM command MRS
 			 * write MR3 MPR disable */
-			write32(DEFAULT_MCHBAR + 0x422c + 0x400 * channel,
-				0x1f000);
-			write32(DEFAULT_MCHBAR + 0x423c + 0x400 * channel,
-				0xc01 | (ctrl->tMOD << 16));
-			write32(DEFAULT_MCHBAR + 0x420c + 0x400 * channel,
-				(slotrank << 24) | 0x360000);
-			write32(DEFAULT_MCHBAR + 0x421c + 0x400 * channel, 0);
-			write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel,
-				0xc0001);
+			MCHBAR32(0x422c + 0x400 * channel) = 0x1f000;
+			MCHBAR32(0x423c + 0x400 * channel) =
+				0xc01 | (ctrl->tMOD << 16);
+			MCHBAR32(0x420c + 0x400 * channel) =
+				(slotrank << 24) | 0x360000;
+			MCHBAR32(0x421c + 0x400 * channel) = 0;
+			MCHBAR32(0x4284 + 0x400 * channel) = 0xc0001;
 
 			wait_428c(channel);
 		}
@@ -1711,45 +1681,39 @@
 			 * write MR3 MPR enable
 			 * in this mode only RD and RDA are allowed
 			 * all reads return a predefined pattern */
-			write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel,
-				0x1f000);
-			write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-				0xc01 | (ctrl->tMOD << 16));
-			write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-				(slotrank << 24) | 0x360004);
-			write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0);
+			MCHBAR32(0x4220 + 0x400 * channel) = 0x1f000;
+			MCHBAR32(0x4230 + 0x400 * channel) =
+				0xc01 | (ctrl->tMOD << 16);
+			MCHBAR32(0x4200 + 0x400 * channel) =
+				(slotrank << 24) | 0x360004;
+			MCHBAR32(0x4210 + 0x400 * channel) = 0;
 
 			/* DRAM command RD */
-			write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel,
-				0x1f105);
-			write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel,
-				0x4041003);
-			write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-				(slotrank << 24) | 0);
-			write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0);
+			MCHBAR32(0x4224 + 0x400 * channel) = 0x1f105;
+			MCHBAR32(0x4234 + 0x400 * channel) = 0x4041003;
+			MCHBAR32(0x4204 + 0x400 * channel) =
+				(slotrank << 24) | 0;
+			MCHBAR32(0x4214 + 0x400 * channel) = 0;
 
 			/* DRAM command RD */
-			write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel,
-				0x1f105);
-			write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel,
-				0x1001 | ((ctrl->CAS + 8) << 16));
-			write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel,
-				(slotrank << 24) | 0x60000);
-			write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel, 0);
+			MCHBAR32(0x4228 + 0x400 * channel) = 0x1f105;
+			MCHBAR32(0x4238 + 0x400 * channel) =
+				0x1001 | ((ctrl->CAS + 8) << 16);
+			MCHBAR32(0x4208 + 0x400 * channel) =
+				(slotrank << 24) | 0x60000;
+			MCHBAR32(0x4218 + 0x400 * channel) = 0;
 
 			/* DRAM command MRS
 			 * write MR3 MPR disable */
-			write32(DEFAULT_MCHBAR + 0x422c + 0x400 * channel,
-				0x1f000);
-			write32(DEFAULT_MCHBAR + 0x423c + 0x400 * channel,
-				0xc01 | (ctrl->tMOD << 16));
+			MCHBAR32(0x422c + 0x400 * channel) = 0x1f000;
+			MCHBAR32(0x423c + 0x400 * channel) =
+				0xc01 | (ctrl->tMOD << 16);
 
-			write32(DEFAULT_MCHBAR + 0x420c + 0x400 * channel,
-				(slotrank << 24) | 0x360000);
-			write32(DEFAULT_MCHBAR + 0x421c + 0x400 * channel, 0);
+			MCHBAR32(0x420c + 0x400 * channel) =
+				(slotrank << 24) | 0x360000;
+			MCHBAR32(0x421c + 0x400 * channel) = 0;
 
-			write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel,
-				0xc0001);
+			MCHBAR32(0x4284 + 0x400 * channel) = 0xc0001;
 			wait_428c(channel);
 		}
 	}
@@ -1763,22 +1727,20 @@
 
 	wait_428c(channel);
 	/* DRAM command NOP */
-	write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x1f207);
-	write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-		0x8000c01 | ((ctrl->CWL + ctrl->tWLO) << 16));
-	write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-		8 | (slotrank << 24));
-	write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0);
+	MCHBAR32(0x4220 + 0x400 * channel) = 0x1f207;
+	MCHBAR32(0x4230 + 0x400 * channel) =
+		0x8000c01 | ((ctrl->CWL + ctrl->tWLO) << 16);
+	MCHBAR32(0x4200 + 0x400 * channel) = 8 | (slotrank << 24);
+	MCHBAR32(0x4210 + 0x400 * channel) = 0;
 
 	/* DRAM command NOP */
-	write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel, 0x1f107);
-	write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel,
-		0x4000c01 | ((ctrl->CAS + 38) << 16));
-	write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-		(slotrank << 24) | 4);
-	write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0);
+	MCHBAR32(0x4224 + 0x400 * channel) = 0x1f107;
+	MCHBAR32(0x4234 + 0x400 * channel) =
+		0x4000c01 | ((ctrl->CAS + 38) << 16);
+	MCHBAR32(0x4204 + 0x400 * channel) = (slotrank << 24) | 4;
+	MCHBAR32(0x4214 + 0x400 * channel) = 0;
 
-	write32(DEFAULT_MCHBAR + 0x400 * channel + 0x4284, 0x40001);
+	MCHBAR32(0x400 * channel + 0x4284) = 0x40001;
 	wait_428c(channel);
 
 	/* disable DQs on this slotrank */
@@ -1792,7 +1754,7 @@
 	int statistics[NUM_LANES][128];
 	int lane;
 
-	write32(DEFAULT_MCHBAR + 0x3400, 0x108052 | (slotrank << 2));
+	MCHBAR32(0x3400) = 0x108052 | (slotrank << 2);
 
 	for (timB = 0; timB < 128; timB++) {
 		FOR_ALL_LANES {
@@ -1804,8 +1766,7 @@
 
 		FOR_ALL_LANES {
 			statistics[lane][timB] =
-			    !((read32
-			       (DEFAULT_MCHBAR + lane_registers[lane] +
+			    !((MCHBAR32(lane_registers[lane] +
 				channel * 0x100 + 4 + ((timB / 32) & 1) * 4)
 			       >> (timB % 32)) & 1);
 		}
@@ -1862,87 +1823,76 @@
 static void adjust_high_timB(ramctr_timing * ctrl)
 {
 	int channel, slotrank, lane, old;
-	write32(DEFAULT_MCHBAR + 0x3400, 0x200);
+	MCHBAR32(0x3400) = 0x200;
 	FOR_ALL_POPULATED_CHANNELS {
 		fill_pattern1(ctrl, channel);
-		write32(DEFAULT_MCHBAR + 0x4288 + (channel << 10), 1);
+		MCHBAR32(0x4288 + (channel << 10)) = 1;
 	}
 	FOR_ALL_POPULATED_CHANNELS FOR_ALL_POPULATED_RANKS {
 
-		write32(DEFAULT_MCHBAR + 0x4288 + 0x400 * channel, 0x10001);
+		MCHBAR32(0x4288 + 0x400 * channel) = 0x10001;
 
 		wait_428c(channel);
 
 		/* DRAM command ACT */
-		write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x1f006);
-		write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-			0xc01 | (ctrl->tRCD << 16));
-		write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-			(slotrank << 24) | 0x60000);
-		write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0);
+		MCHBAR32(0x4220 + 0x400 * channel) = 0x1f006;
+		MCHBAR32(0x4230 + 0x400 * channel) = 0xc01 | (ctrl->tRCD << 16);
+		MCHBAR32(0x4200 + 0x400 * channel) = (slotrank << 24) | 0x60000;
+		MCHBAR32(0x4210 + 0x400 * channel) = 0;
 
 		/* DRAM command NOP */
-		write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel, 0x1f207);
-		write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel, 0x8040c01);
-		write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-			(slotrank << 24) | 0x8);
-		write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0x3e0);
+		MCHBAR32(0x4224 + 0x400 * channel) = 0x1f207;
+		MCHBAR32(0x4234 + 0x400 * channel) = 0x8040c01;
+		MCHBAR32(0x4204 + 0x400 * channel) = (slotrank << 24) | 0x8;
+		MCHBAR32(0x4214 + 0x400 * channel) = 0x3e0;
 
 		/* DRAM command WR */
-		write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel, 0x1f201);
-		write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel, 0x8041003);
-		write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel,
-			(slotrank << 24));
-		write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel, 0x3e2);
+		MCHBAR32(0x4228 + 0x400 * channel) = 0x1f201;
+		MCHBAR32(0x4238 + 0x400 * channel) = 0x8041003;
+		MCHBAR32(0x4208 + 0x400 * channel) = (slotrank << 24);
+		MCHBAR32(0x4218 + 0x400 * channel) = 0x3e2;
 
 		/* DRAM command NOP */
-		write32(DEFAULT_MCHBAR + 0x422c + 0x400 * channel, 0x1f207);
-		write32(DEFAULT_MCHBAR + 0x423c + 0x400 * channel,
-			0x8000c01 | ((ctrl->CWL + ctrl->tWTR + 5) << 16));
-		write32(DEFAULT_MCHBAR + 0x420c + 0x400 * channel,
-			(slotrank << 24) | 0x8);
-		write32(DEFAULT_MCHBAR + 0x421c + 0x400 * channel, 0x3e0);
+		MCHBAR32(0x422c + 0x400 * channel) = 0x1f207;
+		MCHBAR32(0x423c + 0x400 * channel) =
+			0x8000c01 | ((ctrl->CWL + ctrl->tWTR + 5) << 16);
+		MCHBAR32(0x420c + 0x400 * channel) = (slotrank << 24) | 0x8;
+		MCHBAR32(0x421c + 0x400 * channel) = 0x3e0;
 
-		write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 0xc0001);
+		MCHBAR32(0x4284 + 0x400 * channel) = 0xc0001;
 
 		wait_428c(channel);
 
 		/* DRAM command PREA */
-		write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x1f002);
-		write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-			0xc01 | ((ctrl->tRP) << 16));
-		write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-			(slotrank << 24) | 0x60400);
-		write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0x240);
+		MCHBAR32(0x4220 + 0x400 * channel) = 0x1f002;
+		MCHBAR32(0x4230 + 0x400 * channel) =
+			0xc01 | ((ctrl->tRP) << 16);
+		MCHBAR32(0x4200 + 0x400 * channel) =
+			(slotrank << 24) | 0x60400;
+		MCHBAR32(0x4210 + 0x400 * channel) = 0x240;
 
 		/* DRAM command ACT */
-		write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel, 0x1f006);
-		write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel,
-			0xc01 | ((ctrl->tRCD) << 16));
-		write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-			(slotrank << 24) | 0x60000);
-		write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0);
+		MCHBAR32(0x4224 + 0x400 * channel) = 0x1f006;
+		MCHBAR32(0x4234 + 0x400 * channel) =
+			0xc01 | ((ctrl->tRCD) << 16);
+		MCHBAR32(0x4204 + 0x400 * channel) = (slotrank << 24) | 0x60000;
+		MCHBAR32(0x4214 + 0x400 * channel) = 0;
 
 		/* DRAM command RD */
-		write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel, 0x3f105);
-		write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel,
-			0x4000c01 |
-			((ctrl->tRP +
+		MCHBAR32(0x4228 + 0x400 * channel) = 0x3f105;
+		MCHBAR32(0x4238 + 0x400 * channel) = 0x4000c01 | ((ctrl->tRP +
 			  ctrl->timings[channel][slotrank].val_4024 +
-			  ctrl->timings[channel][slotrank].val_4028) << 16));
-		write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel,
-			(slotrank << 24) | 0x60008);
-		write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel, 0);
+			  ctrl->timings[channel][slotrank].val_4028) << 16);
+		MCHBAR32(0x4208 + 0x400 * channel) = (slotrank << 24) | 0x60008;
+		MCHBAR32(0x4218 + 0x400 * channel) = 0;
 
-		write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 0x80001);
+		MCHBAR32(0x4284 + 0x400 * channel) = 0x80001;
 		wait_428c(channel);
 		FOR_ALL_LANES {
-			u64 res =
-				read32(DEFAULT_MCHBAR + lane_registers[lane] +
-					0x100 * channel + 4);
-			res |=
-				((u64) read32(DEFAULT_MCHBAR + lane_registers[lane] +
-					0x100 * channel + 8)) << 32;
+			u64 res = MCHBAR32(lane_registers[lane] +
+				0x100 * channel + 4);
+			res |= ((u64) MCHBAR32(lane_registers[lane] +
+				0x100 * channel + 8)) << 32;
 			old = ctrl->timings[channel][slotrank].lanes[lane].timB;
 			ctrl->timings[channel][slotrank].lanes[lane].timB +=
 				get_timB_high_adjust(res) * 64;
@@ -1954,7 +1904,7 @@
 				timB);
 		}
 	}
-	write32(DEFAULT_MCHBAR + 0x3400, 0);
+	MCHBAR32(0x3400) = 0;
 }
 
 static void write_op(ramctr_timing * ctrl, int channel)
@@ -1967,15 +1917,14 @@
 	slotrank = !(ctrl->rankmap[channel] & 1) ? 2 : 0;
 
 	/* DRAM command ACT */
-	write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x0f003);
-	write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel, 0x41001);
+	MCHBAR32(0x4220 + 0x400 * channel) = 0x0f003;
+	MCHBAR32(0x4230 + 0x400 * channel) = 0x41001;
 
-	write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-		(slotrank << 24) | 0x60000);
+	MCHBAR32(0x4200 + 0x400 * channel) = (slotrank << 24) | 0x60000;
 
-	write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0x3e0);
+	MCHBAR32(0x4210 + 0x400 * channel) = 0x3e0;
 
-	write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 1);
+	MCHBAR32(0x4284 + 0x400 * channel) = 1;
 	wait_428c(channel);
 }
 
@@ -1995,21 +1944,20 @@
 {
 	int channel, slotrank, lane;
 	int err;
+	volatile u32 tmp;
 
 	FOR_ALL_POPULATED_CHANNELS
-	    write32(DEFAULT_MCHBAR + 0x4008 + 0x400 * channel,
-		    read32(DEFAULT_MCHBAR + 0x4008 +
-			   0x400 * channel) | 0x8000000);
+		MCHBAR32(0x4008 + 0x400 * channel) =
+			MCHBAR32(0x4008 + 0x400 * channel) | 0x8000000;
 
 	FOR_ALL_POPULATED_CHANNELS {
 		write_op(ctrl, channel);
-		write32(DEFAULT_MCHBAR + 0x4020 + 0x400 * channel,
-			read32(DEFAULT_MCHBAR + 0x4020 +
-			       0x400 * channel) | 0x200000);
+		MCHBAR32(0x4020 + 0x400 * channel) =
+			MCHBAR32(0x4020 + 0x400 * channel) | 0x200000;
 	}
 
 	/* refresh disable */
-	write32(DEFAULT_MCHBAR + 0x5030, read32(DEFAULT_MCHBAR + 0x5030) & ~8);
+	MCHBAR32(0x5030) = MCHBAR32(0x5030) & ~8;
 	FOR_ALL_POPULATED_CHANNELS {
 		write_op(ctrl, channel);
 	}
@@ -2018,11 +1966,11 @@
 	 * disable all DQ outputs
 	 * only NOP is allowed in this mode */
 	FOR_ALL_CHANNELS
-	    FOR_ALL_POPULATED_RANKS
-		write_mrreg(ctrl, channel, slotrank, 1,
-			    make_mr1(ctrl, slotrank, channel) | 0x1080);
+		FOR_ALL_POPULATED_RANKS
+			write_mrreg(ctrl, channel, slotrank, 1,
+				make_mr1(ctrl, slotrank, channel) | 0x1080);
 
-	write32(DEFAULT_MCHBAR + 0x3400, 0x108052);
+	MCHBAR32(0x3400) = 0x108052;
 
 	toggle_io_reset();
 
@@ -2036,30 +1984,29 @@
 	/* disable write leveling on all ranks */
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS
 		write_mrreg(ctrl, channel,
-			    slotrank, 1, make_mr1(ctrl, slotrank, channel));
+			slotrank, 1, make_mr1(ctrl, slotrank, channel));
 
-	write32(DEFAULT_MCHBAR + 0x3400, 0);
+	MCHBAR32(0x3400) = 0;
 
 	FOR_ALL_POPULATED_CHANNELS
 		wait_428c(channel);
 
 	/* refresh enable */
-	write32(DEFAULT_MCHBAR + 0x5030, read32(DEFAULT_MCHBAR + 0x5030) | 8);
+	MCHBAR32(0x5030) = MCHBAR32(0x5030) | 8;
 
 	FOR_ALL_POPULATED_CHANNELS {
-		write32(DEFAULT_MCHBAR + 0x4020 + 0x400 * channel,
-			~0x00200000 & read32(DEFAULT_MCHBAR + 0x4020 +
-					     0x400 * channel));
-		read32(DEFAULT_MCHBAR + 0x428c + 0x400 * channel);
+		MCHBAR32(0x4020 + 0x400 * channel) =
+			~0x00200000 & MCHBAR32(0x4020 + 0x400 * channel);
+		tmp = MCHBAR32(0x428c + 0x400 * channel);
 		wait_428c(channel);
 
 		/* DRAM command ZQCS */
-		write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x0f003);
-		write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel, 0x659001);
-		write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel, 0x60000);
-		write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0x3e0);
+		MCHBAR32(0x4220 + 0x400 * channel) = 0x0f003;
+		MCHBAR32(0x4230 + 0x400 * channel) = 0x659001;
+		MCHBAR32(0x4200 + 0x400 * channel) = 0x60000;
+		MCHBAR32(0x4210 + 0x400 * channel) = 0x3e0;
 
-		write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 1);
+		MCHBAR32(0x4284 + 0x400 * channel) = 1;
 		wait_428c(channel);
 	}
 
@@ -2070,14 +2017,13 @@
 	printram("CPF\n");
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS FOR_ALL_LANES {
-		read32(DEFAULT_MCHBAR + 0x4080 + 0x400 * channel + 4 * lane);
-		write32(DEFAULT_MCHBAR + 0x4080 + 0x400 * channel + 4 * lane,
-			0);
+		tmp = MCHBAR32(0x4080 + 0x400 * channel + 4 * lane);
+		MCHBAR32(0x4080 + 0x400 * channel + 4 * lane) = 0;
 	}
 
 	FOR_ALL_POPULATED_CHANNELS {
 		fill_pattern0(ctrl, channel, 0xaaaaaaaa, 0x55555555);
-		write32(DEFAULT_MCHBAR + 0x4288 + (channel << 10), 0);
+		MCHBAR32(0x4288 + (channel << 10)) = 0;
 	}
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS {
@@ -2096,9 +2042,8 @@
 		program_timings(ctrl, channel);
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS FOR_ALL_LANES {
-		read32(DEFAULT_MCHBAR + 0x4080 + 0x400 * channel + 4 * lane);
-		write32(DEFAULT_MCHBAR + 0x4080 + 0x400 * channel + 4 * lane,
-			0);
+		tmp = MCHBAR32(0x4080 + 0x400 * channel + 4 * lane);
+		MCHBAR32(0x4080 + 0x400 * channel + 4 * lane) = 0;
 	}
 	return 0;
 }
@@ -2118,53 +2063,48 @@
 		}
 		program_timings(ctrl, channel);
 		FOR_ALL_LANES {
-			write32(DEFAULT_MCHBAR + 4 * lane + 0x4f40, 0);
+			MCHBAR32(4 * lane + 0x4f40) = 0;
 		}
 
-		write32(DEFAULT_MCHBAR + 0x4288 + 0x400 * channel, 0x1f);
+		MCHBAR32(0x4288 + 0x400 * channel) = 0x1f;
 
 		wait_428c(channel);
 		/* DRAM command ACT */
-		write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x1f006);
-		write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
+		MCHBAR32(0x4220 + 0x400 * channel) = 0x1f006;
+		MCHBAR32(0x4230 + 0x400 * channel) =
 			((max(ctrl->tRRD, (ctrl->tFAW >> 2) + 1)) << 10)
-			| 8 | (ctrl->tRCD << 16));
+			| 8 | (ctrl->tRCD << 16);
 
-		write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-			(slotrank << 24) | ctr | 0x60000);
+		MCHBAR32(0x4200 + 0x400 * channel) =
+			(slotrank << 24) | ctr | 0x60000;
 
-		write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0x244);
+		MCHBAR32(0x4210 + 0x400 * channel) = 0x244;
 		/* DRAM command WR */
-		write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel, 0x1f201);
-		write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel,
-			0x8001020 | ((ctrl->CWL + ctrl->tWTR + 8) << 16));
-		write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-			(slotrank << 24));
-		write32(DEFAULT_MCHBAR + 0x4244 + 0x400 * channel, 0x389abcd);
-		write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0x20e42);
+		MCHBAR32(0x4224 + 0x400 * channel) = 0x1f201;
+		MCHBAR32(0x4234 + 0x400 * channel) =
+			0x8001020 | ((ctrl->CWL + ctrl->tWTR + 8) << 16);
+		MCHBAR32(0x4204 + 0x400 * channel) = (slotrank << 24);
+		MCHBAR32(0x4244 + 0x400 * channel) = 0x389abcd;
+		MCHBAR32(0x4214 + 0x400 * channel) = 0x20e42;
 
 		/* DRAM command RD */
-		write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel, 0x1f105);
-		write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel,
-			0x4001020 | (max(ctrl->tRTP, 8) << 16));
-		write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel,
-			(slotrank << 24));
-		write32(DEFAULT_MCHBAR + 0x4248 + 0x400 * channel, 0x389abcd);
-		write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel, 0x20e42);
+		MCHBAR32(0x4228 + 0x400 * channel) = 0x1f105;
+		MCHBAR32(0x4238 + 0x400 * channel) =
+			0x4001020 | (max(ctrl->tRTP, 8) << 16);
+		MCHBAR32(0x4208 + 0x400 * channel) = (slotrank << 24);
+		MCHBAR32(0x4248 + 0x400 * channel) = 0x389abcd;
+		MCHBAR32(0x4218 + 0x400 * channel) = 0x20e42;
 
 		/* DRAM command PRE */
-		write32(DEFAULT_MCHBAR + 0x422c + 0x400 * channel, 0x1f002);
-		write32(DEFAULT_MCHBAR + 0x423c + 0x400 * channel, 0xf1001);
-		write32(DEFAULT_MCHBAR + 0x420c + 0x400 * channel,
-			(slotrank << 24) | 0x60400);
-		write32(DEFAULT_MCHBAR + 0x421c + 0x400 * channel, 0x240);
+		MCHBAR32(0x422c + 0x400 * channel) = 0x1f002;
+		MCHBAR32(0x423c + 0x400 * channel) = 0xf1001;
+		MCHBAR32(0x420c + 0x400 * channel) = (slotrank << 24) | 0x60400;
+		MCHBAR32(0x421c + 0x400 * channel) = 0x240;
 
-		write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 0xc0001);
+		MCHBAR32(0x4284 + 0x400 * channel) = 0xc0001;
 		wait_428c(channel);
 		FOR_ALL_LANES {
-			u32 r32 =
-			    read32(DEFAULT_MCHBAR + 0x4340 + 4 * lane +
-				   0x400 * channel);
+			u32 r32 = MCHBAR32(0x4340 + 4 * lane + 0x400 * channel);
 
 			if (r32 == 0)
 				lanes_ok |= 1 << lane;
@@ -2222,23 +2162,21 @@
 		slotrank = !(ctrl->rankmap[channel] & 1) ? 2 : 0;
 
 		/* DRAM command ZQCS */
-		write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x0f003);
-		write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel, 0x41001);
+		MCHBAR32(0x4220 + 0x400 * channel) = 0x0f003;
+		MCHBAR32(0x4230 + 0x400 * channel) = 0x41001;
 
-		write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-			(slotrank << 24) | 0x60000);
+		MCHBAR32(0x4200 + 0x400 * channel) = (slotrank << 24) | 0x60000;
 
-		write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0x3e0);
+		MCHBAR32(0x4210 + 0x400 * channel) = 0x3e0;
 
-		write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 1);
+		MCHBAR32(0x4284 + 0x400 * channel) = 1;
 		wait_428c(channel);
-		write32(DEFAULT_MCHBAR + 0x4020 + 0x400 * channel,
-			read32(DEFAULT_MCHBAR + 0x4020 +
-			       0x400 * channel) | 0x200000);
+		MCHBAR32(0x4020 + 0x400 * channel) =
+			MCHBAR32(0x4020 + 0x400 * channel) | 0x200000;
 	}
 
 	/* refresh disable */
-	write32(DEFAULT_MCHBAR + 0x5030, read32(DEFAULT_MCHBAR + 0x5030) & ~8);
+	MCHBAR32(0x5030) = MCHBAR32(0x5030) & ~8;
 	FOR_ALL_POPULATED_CHANNELS {
 		wait_428c(channel);
 
@@ -2246,15 +2184,14 @@
 		slotrank = !(ctrl->rankmap[channel] & 1) ? 2 : 0;
 
 		/* DRAM command ZQCS */
-		write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x0f003);
-		write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel, 0x41001);
+		MCHBAR32(0x4220 + 0x400 * channel) = 0x0f003;
+		MCHBAR32(0x4230 + 0x400 * channel) = 0x41001;
 
-		write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-			(slotrank << 24) | 0x60000);
+		MCHBAR32(0x4200 + 0x400 * channel) = (slotrank << 24) | 0x60000;
 
-		write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0x3e0);
+		MCHBAR32(0x4210 + 0x400 * channel) = 0x3e0;
 
-		write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 1);
+		MCHBAR32(0x4284 + 0x400 * channel) = 1;
 		wait_428c(channel);
 	}
 
@@ -2317,8 +2254,7 @@
 	FOR_ALL_POPULATED_RANKS {
 		struct run rn =
 			get_longest_zero_run(stat[slotrank], 255);
-		ctrl->timings[channel][slotrank].val_320c =
-			rn.middle - 127;
+		ctrl->timings[channel][slotrank].val_320c = rn.middle - 127;
 		printram("cmd_stretch: %d, %d: 0x%02x-0x%02x-0x%02x\n",
 				 channel, slotrank, rn.start, rn.middle, rn.end);
 		if (rn.all || rn.length < MIN_C320C_LEN) {
@@ -2342,7 +2278,7 @@
 
 	FOR_ALL_POPULATED_CHANNELS {
 		fill_pattern5(ctrl, channel, 0);
-		write32(DEFAULT_MCHBAR + 0x4288 + 0x400 * channel, 0x1f);
+		MCHBAR32(0x4288 + 0x400 * channel) = 0x1f;
 	}
 
 	FOR_ALL_POPULATED_CHANNELS {
@@ -2406,10 +2342,9 @@
 		program_timings(ctrl, channel);
 
 		FOR_ALL_LANES {
-			write32(DEFAULT_MCHBAR + 0x4340 + 0x400 * channel +
-				4 * lane, 0);
-			read32(DEFAULT_MCHBAR + 0x400 * channel + 4 * lane +
-			       0x4140);
+			volatile u32 tmp;
+			MCHBAR32(0x4340 + 0x400 * channel + 4 * lane) = 0;
+			tmp = MCHBAR32(0x400 * channel + 4 * lane + 0x4140);
 		}
 
 		wait_428c(channel);
@@ -2417,45 +2352,41 @@
 		 * write MR3 MPR enable
 		 * in this mode only RD and RDA are allowed
 		 * all reads return a predefined pattern */
-		write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x1f000);
-		write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-			(0xc01 | (ctrl->tMOD << 16)));
-		write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-			(slotrank << 24) | 0x360004);
-		write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0);
+		MCHBAR32(0x4220 + 0x400 * channel) = 0x1f000;
+		MCHBAR32(0x4230 + 0x400 * channel) =
+			0xc01 | (ctrl->tMOD << 16);
+		MCHBAR32(0x4200 + 0x400 * channel) =
+			(slotrank << 24) | 0x360004;
+		MCHBAR32(0x4210 + 0x400 * channel) = 0;
 
 		/* DRAM command RD */
-		write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel, 0x1f105);
-		write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel, 0x40411f4);
-		write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-			(slotrank << 24));
-		write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0);
+		MCHBAR32(0x4224 + 0x400 * channel) = 0x1f105;
+		MCHBAR32(0x4234 + 0x400 * channel) = 0x40411f4;
+		MCHBAR32(0x4204 + 0x400 * channel) = slotrank << 24;
+		MCHBAR32(0x4214 + 0x400 * channel) = 0;
 
 		/* DRAM command RD */
-		write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel, 0x1f105);
-		write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel,
-			0x1001 | ((ctrl->CAS + 8) << 16));
-		write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel,
-			(slotrank << 24) | 0x60000);
-		write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel, 0);
+		MCHBAR32(0x4228 + 0x400 * channel) = 0x1f105;
+		MCHBAR32(0x4238 + 0x400 * channel) =
+			0x1001 | ((ctrl->CAS + 8) << 16);
+		MCHBAR32(0x4208 + 0x400 * channel) = (slotrank << 24) | 0x60000;
+		MCHBAR32(0x4218 + 0x400 * channel) = 0;
 
 		/* DRAM command MRS
 		 * MR3 disable MPR */
-		write32(DEFAULT_MCHBAR + 0x422c + 0x400 * channel, 0x1f000);
-		write32(DEFAULT_MCHBAR + 0x423c + 0x400 * channel,
-			(0xc01 | (ctrl->tMOD << 16)));
-		write32(DEFAULT_MCHBAR + 0x420c + 0x400 * channel,
-			(slotrank << 24) | 0x360000);
-		write32(DEFAULT_MCHBAR + 0x421c + 0x400 * channel, 0);
+		MCHBAR32(0x422c + 0x400 * channel) = 0x1f000;
+		MCHBAR32(0x423c + 0x400 * channel) = 0xc01 | (ctrl->tMOD << 16);
+		MCHBAR32(0x420c + 0x400 * channel) =
+			(slotrank << 24) | 0x360000;
+		MCHBAR32(0x421c + 0x400 * channel) = 0;
 
-		write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel, 0xc0001);
+		MCHBAR32(0x4284 + 0x400 * channel) = 0xc0001;
 
 		wait_428c(channel);
 
 		FOR_ALL_LANES {
 			statistics[lane][edge] =
-			    read32(DEFAULT_MCHBAR + 0x4340 + 0x400 * channel +
-				   lane * 4);
+				MCHBAR32(0x4340 + 0x400 * channel + lane * 4);
 		}
 	}
 	FOR_ALL_LANES {
@@ -2480,21 +2411,20 @@
 	int channel, slotrank, lane;
 	int err;
 
-	write32(DEFAULT_MCHBAR + 0x3400, 0);
+	MCHBAR32(0x3400) = 0;
 
 	toggle_io_reset();
 
 	FOR_ALL_POPULATED_CHANNELS FOR_ALL_LANES {
-		write32(DEFAULT_MCHBAR + 4 * lane +
-			0x400 * channel + 0x4080, 0);
+		MCHBAR32(4 * lane + 0x400 * channel + 0x4080) = 0;
 	}
 
 	FOR_ALL_POPULATED_CHANNELS {
 		fill_pattern0(ctrl, channel, 0, 0);
-		write32(DEFAULT_MCHBAR + 0x4288 + (channel << 10), 0);
+		MCHBAR32(0x4288 + (channel << 10)) = 0;
 		FOR_ALL_LANES {
-			read32(DEFAULT_MCHBAR + 0x400 * channel +
-			       lane * 4 + 0x4140);
+			volatile u32 tmp;
+			tmp = MCHBAR32(0x400 * channel + lane * 4 + 0x4140);
 		}
 
 		FOR_ALL_POPULATED_RANKS FOR_ALL_LANES {
@@ -2514,43 +2444,37 @@
 			 * write MR3 MPR enable
 			 * in this mode only RD and RDA are allowed
 			 * all reads return a predefined pattern */
-			write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel,
-				0x1f000);
-			write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-				0xc01 | (ctrl->tMOD << 16));
-			write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-				(slotrank << 24) | 0x360004);
-			write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0);
+			MCHBAR32(0x4220 + 0x400 * channel) = 0x1f000;
+			MCHBAR32(0x4230 + 0x400 * channel) =
+				0xc01 | (ctrl->tMOD << 16);
+			MCHBAR32(0x4200 + 0x400 * channel) =
+				(slotrank << 24) | 0x360004;
+			MCHBAR32(0x4210 + 0x400 * channel) = 0;
 
 			/* DRAM command RD */
-			write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel,
-				0x1f105);
-			write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel,
-				0x4041003);
-			write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-				(slotrank << 24) | 0);
-			write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0);
+			MCHBAR32(0x4224 + 0x400 * channel) = 0x1f105;
+			MCHBAR32(0x4234 + 0x400 * channel) = 0x4041003;
+			MCHBAR32(0x4204 + 0x400 * channel) =
+				(slotrank << 24) | 0;
+			MCHBAR32(0x4214 + 0x400 * channel) = 0;
 
 			/* DRAM command RD */
-			write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel,
-				0x1f105);
-			write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel,
-				0x1001 | ((ctrl->CAS + 8) << 16));
-			write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel,
-				(slotrank << 24) | 0x60000);
-			write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel, 0);
+			MCHBAR32(0x4228 + 0x400 * channel) = 0x1f105;
+			MCHBAR32(0x4238 + 0x400 * channel) =
+				0x1001 | ((ctrl->CAS + 8) << 16);
+			MCHBAR32(0x4208 + 0x400 * channel) =
+				(slotrank << 24) | 0x60000;
+			MCHBAR32(0x4218 + 0x400 * channel) = 0;
 
 			/* DRAM command MRS
 			 * MR3 disable MPR */
-			write32(DEFAULT_MCHBAR + 0x422c + 0x400 * channel,
-				0x1f000);
-			write32(DEFAULT_MCHBAR + 0x423c + 0x400 * channel,
-				0xc01 | (ctrl->tMOD << 16));
-			write32(DEFAULT_MCHBAR + 0x420c + 0x400 * channel,
-				(slotrank << 24) | 0x360000);
-			write32(DEFAULT_MCHBAR + 0x421c + 0x400 * channel, 0);
-			write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel,
-				0xc0001);
+			MCHBAR32(0x422c + 0x400 * channel) = 0x1f000;
+			MCHBAR32(0x423c + 0x400 * channel) =
+				0xc01 | (ctrl->tMOD << 16);
+			MCHBAR32(0x420c + 0x400 * channel) =
+				(slotrank << 24) | 0x360000;
+			MCHBAR32(0x421c + 0x400 * channel) = 0;
+			MCHBAR32(0x4284 + 0x400 * channel) = 0xc0001;
 
 			wait_428c(channel);
 		}
@@ -2574,72 +2498,65 @@
 			 * write MR3 MPR enable
 			 * in this mode only RD and RDA are allowed
 			 * all reads return a predefined pattern */
-			write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel,
-				0x1f000);
-			write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-				0xc01 | (ctrl->tMOD << 16));
-			write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-				(slotrank << 24) | 0x360004);
-			write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0);
+			MCHBAR32(0x4220 + 0x400 * channel) = 0x1f000;
+			MCHBAR32(0x4230 + 0x400 * channel) =
+				0xc01 | (ctrl->tMOD << 16);
+			MCHBAR32(0x4200 + 0x400 * channel) =
+				(slotrank << 24) | 0x360004;
+			MCHBAR32(0x4210 + 0x400 * channel) = 0;
 
 			/* DRAM command RD */
-			write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel,
-				0x1f105);
-			write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel,
-				0x4041003);
-			write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-				(slotrank << 24) | 0);
-			write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel, 0);
+			MCHBAR32(0x4224 + 0x400 * channel) = 0x1f105;
+			MCHBAR32(0x4234 + 0x400 * channel) = 0x4041003;
+			MCHBAR32(0x4204 + 0x400 * channel) =
+				(slotrank << 24) | 0;
+			MCHBAR32(0x4214 + 0x400 * channel) = 0;
 
 			/* DRAM command RD */
-			write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel,
-				0x1f105);
-			write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel,
-				0x1001 | ((ctrl->CAS + 8) << 16));
-			write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel,
-				(slotrank << 24) | 0x60000);
-			write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel, 0);
+			MCHBAR32(0x4228 + 0x400 * channel) = 0x1f105;
+			MCHBAR32(0x4238 + 0x400 * channel) =
+				0x1001 | ((ctrl->CAS + 8) << 16);
+			MCHBAR32(0x4208 + 0x400 * channel) =
+				(slotrank << 24) | 0x60000;
+			MCHBAR32(0x4218 + 0x400 * channel) = 0;
 
 			/* DRAM command MRS
 			 * MR3 disable MPR */
-			write32(DEFAULT_MCHBAR + 0x422c + 0x400 * channel,
-				0x1f000);
-			write32(DEFAULT_MCHBAR + 0x423c + 0x400 * channel,
-				0xc01 | (ctrl->tMOD << 16));
-			write32(DEFAULT_MCHBAR + 0x420c + 0x400 * channel,
-				(slotrank << 24) | 0x360000);
-			write32(DEFAULT_MCHBAR + 0x421c + 0x400 * channel, 0);
+			MCHBAR32(0x422c + 0x400 * channel) = 0x1f000;
+			MCHBAR32(0x423c + 0x400 * channel) =
+				0xc01 | (ctrl->tMOD << 16);
+			MCHBAR32(0x420c + 0x400 * channel) =
+				(slotrank << 24) | 0x360000;
+			MCHBAR32(0x421c + 0x400 * channel) = 0;
 
-			write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel,
-				0xc0001);
+			MCHBAR32(0x4284 + 0x400 * channel) = 0xc0001;
 			wait_428c(channel);
 		}
 
 		/* XXX: check any measured value ? */
 
 		FOR_ALL_LANES {
-			write32(DEFAULT_MCHBAR + 0x4080 + 0x400 * channel +
-				lane * 4,
-				~read32(DEFAULT_MCHBAR + 0x4040 +
-					0x400 * channel + lane * 4) & 0xff);
+			MCHBAR32(0x4080 + 0x400 * channel + lane * 4) =
+				~MCHBAR32(0x4040 + 0x400 * channel + lane * 4)
+					& 0xff;
 		}
 
 		fill_pattern0(ctrl, channel, 0, 0xffffffff);
-		write32(DEFAULT_MCHBAR + 0x4288 + (channel << 10), 0);
+		MCHBAR32(0x4288 + (channel << 10)) = 0;
 	}
 
 	/* FIXME: under some conditions (older chipsets?) vendor BIOS sets both edges to the same value.  */
-	write32(DEFAULT_MCHBAR + 0x4eb0, 0x300);
+	MCHBAR32(0x4eb0) = 0x300;
 	printram("discover falling edges:\n[%x] = %x\n", 0x4eb0, 0x300);
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS {
 		err = discover_edges_real(ctrl, channel, slotrank,
-				    falling_edges[channel][slotrank]);
+			falling_edges[channel][slotrank]);
 		if (err)
 			return err;
 	}
 
-	write32(DEFAULT_MCHBAR + 0x4eb0, 0x200);
+	MCHBAR32(0x4eb0) = 0x200;
 	printram("discover rising edges:\n[%x] = %x\n", 0x4eb0, 0x200);
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS {
@@ -2649,7 +2566,7 @@
 			return err;
 	}
 
-	write32(DEFAULT_MCHBAR + 0x4eb0, 0);
+	MCHBAR32(0x4eb0) = 0;
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS FOR_ALL_LANES {
 		ctrl->timings[channel][slotrank].lanes[lane].falling =
@@ -2663,8 +2580,7 @@
 	}
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS FOR_ALL_LANES {
-		write32(DEFAULT_MCHBAR + 0x4080 + 0x400 * channel + 4 * lane,
-			0);
+		MCHBAR32(0x4080 + 0x400 * channel + 4 * lane) = 0;
 	}
 	return 0;
 }
@@ -2680,6 +2596,7 @@
 	int lower[NUM_LANES];
 	int upper[NUM_LANES];
 	int pat;
+	volatile u32 tmp;
 
 	FOR_ALL_LANES {
 		lower[lane] = 0;
@@ -2687,13 +2604,12 @@
 	}
 
 	for (i = 0; i < 3; i++) {
-		write32(DEFAULT_MCHBAR + 0x3000 + 0x100 * channel,
-			reg3000b24[i] << 24);
+		MCHBAR32(0x3000 + 0x100 * channel) = reg3000b24[i] << 24;
 		printram("[%x] = 0x%08x\n",
 		       0x3000 + 0x100 * channel, reg3000b24[i] << 24);
 		for (pat = 0; pat < NUM_PATTERNS; pat++) {
 			fill_pattern5(ctrl, channel, pat);
-			write32(DEFAULT_MCHBAR + 0x4288 + 0x400 * channel, 0x1f);
+			MCHBAR32(0x4288 + 0x400 * channel) = 0x1f;
 			printram("using pattern %d\n", pat);
 			for (edge = 0; edge <= MAX_EDGE_TIMING; edge++) {
 				FOR_ALL_LANES {
@@ -2705,60 +2621,51 @@
 				program_timings(ctrl, channel);
 
 				FOR_ALL_LANES {
-					write32(DEFAULT_MCHBAR + 0x4340 +
-						0x400 * channel + 4 * lane, 0);
-					read32(DEFAULT_MCHBAR + 0x400 * channel +
-					       4 * lane + 0x4140);
+					MCHBAR32(0x4340 + 0x400 * channel +
+						4 * lane) = 0;
+					tmp = MCHBAR32(0x400 * channel +
+						4 * lane + 0x4140);
 				}
 				wait_428c(channel);
 
 				/* DRAM command ACT */
-				write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel,
-					0x1f006);
-				write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
-					0x4 | (ctrl->tRCD << 16)
-					| (max(ctrl->tRRD, (ctrl->tFAW >> 2) + 1) <<
-					   10));
-				write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-					(slotrank << 24) | 0x60000);
-				write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel,
-					0x240);
+				MCHBAR32(0x4220 + 0x400 * channel) = 0x1f006;
+				MCHBAR32(0x4230 + 0x400 * channel) =
+					0x4 | (ctrl->tRCD << 16) |
+					(max(ctrl->tRRD, (ctrl->tFAW >> 2) + 1)
+					<< 10);
+				MCHBAR32(0x4200 + 0x400 * channel) =
+					(slotrank << 24) | 0x60000;
+				MCHBAR32(0x4210 + 0x400 * channel) = 0x240;
 
 				/* DRAM command WR */
-				write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel,
-					0x1f201);
-				write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel,
-					0x8005020 | ((ctrl->tWTR + ctrl->CWL + 8) <<
-						     16));
-				write32(DEFAULT_MCHBAR + 0x4204 + 0x400 * channel,
-					(slotrank << 24));
-				write32(DEFAULT_MCHBAR + 0x4214 + 0x400 * channel,
-					0x242);
+				MCHBAR32(0x4224 + 0x400 * channel) = 0x1f201;
+				MCHBAR32(0x4234 + 0x400 * channel) = 0x8005020 |
+					((ctrl->tWTR + ctrl->CWL + 8) << 16);
+				MCHBAR32(0x4204 + 0x400 * channel) =
+					slotrank << 24;
+				MCHBAR32(0x4214 + 0x400 * channel) = 0x242;
 
 				/* DRAM command RD */
-				write32(DEFAULT_MCHBAR + 0x4228 + 0x400 * channel,
-					0x1f105);
-				write32(DEFAULT_MCHBAR + 0x4238 + 0x400 * channel,
-					0x4005020 | (max(ctrl->tRTP, 8) << 16));
-				write32(DEFAULT_MCHBAR + 0x4208 + 0x400 * channel,
-					(slotrank << 24));
-				write32(DEFAULT_MCHBAR + 0x4218 + 0x400 * channel,
-					0x242);
+				MCHBAR32(0x4228 + 0x400 * channel) = 0x1f105;
+				MCHBAR32(0x4238 + 0x400 * channel) =
+					0x4005020 | (max(ctrl->tRTP, 8) << 16);
+				MCHBAR32(0x4208 + 0x400 * channel) =
+					slotrank << 24;
+				MCHBAR32(0x4218 + 0x400 * channel) = 0x242;
 
 				/* DRAM command PRE */
-				write32(DEFAULT_MCHBAR + 0x422c + 0x400 * channel,
-					0x1f002);
-				write32(DEFAULT_MCHBAR + 0x423c + 0x400 * channel,
-					0xc01 | (ctrl->tRP << 16));
-				write32(DEFAULT_MCHBAR + 0x420c + 0x400 * channel,
-					(slotrank << 24) | 0x60400);
-				write32(DEFAULT_MCHBAR + 0x421c + 0x400 * channel, 0);
+				MCHBAR32(0x422c + 0x400 * channel) = 0x1f002;
+				MCHBAR32(0x423c + 0x400 * channel) =
+					0xc01 | (ctrl->tRP << 16);
+				MCHBAR32(0x420c + 0x400 * channel) =
+					(slotrank << 24) | 0x60400;
+				MCHBAR32(0x421c + 0x400 * channel) = 0;
 
-				write32(DEFAULT_MCHBAR + 0x4284 + 0x400 * channel,
-					0xc0001);
+				MCHBAR32(0x4284 + 0x400 * channel) = 0xc0001;
 				wait_428c(channel);
 				FOR_ALL_LANES {
-					read32(DEFAULT_MCHBAR + 0x4340 +
+					tmp = MCHBAR32(0x4340 +
 					       0x400 * channel + lane * 4);
 				}
 
@@ -2790,7 +2697,7 @@
 		}
 	}
 
-	write32(DEFAULT_MCHBAR + 0x3000, 0);
+	MCHBAR32(0x3000) = 0;
 	printram("CPA\n");
 	return 0;
 }
@@ -2803,7 +2710,7 @@
 	int err;
 
 	/* FIXME: under some conditions (older chipsets?) vendor BIOS sets both edges to the same value.  */
-	write32(DEFAULT_MCHBAR + 0x4eb0, 0x300);
+	MCHBAR32(0x4eb0) = 0x300;
 	printram("discover falling edges write:\n[%x] = %x\n", 0x4eb0, 0x300);
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS {
@@ -2813,7 +2720,7 @@
 			return err;
 	}
 
-	write32(DEFAULT_MCHBAR + 0x4eb0, 0x200);
+	MCHBAR32(0x4eb0) = 0x200;
 	printram("discover rising edges write:\n[%x] = %x\n", 0x4eb0, 0x200);
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS {
@@ -2823,7 +2730,7 @@
 			return err;
 	}
 
-	write32(DEFAULT_MCHBAR + 0x4eb0, 0);
+	MCHBAR32(0x4eb0) = 0;
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS FOR_ALL_LANES {
 		ctrl->timings[channel][slotrank].lanes[lane].falling =
@@ -2836,8 +2743,7 @@
 		program_timings(ctrl, channel);
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS FOR_ALL_LANES {
-		write32(DEFAULT_MCHBAR + 0x4080 + 0x400 * channel + 4 * lane,
-			0);
+		MCHBAR32(0x4080 + 0x400 * channel + 4 * lane) = 0;
 	}
 	return 0;
 }
@@ -2846,49 +2752,35 @@
 {
 	wait_428c(channel);
 	/* DRAM command ACT */
-	write32(DEFAULT_MCHBAR + 0x4220 + 0x400 * channel, 0x1f006);
-	write32(DEFAULT_MCHBAR + 0x4230 + 0x400 * channel,
+	MCHBAR32(0x4220 + 0x400 * channel) = 0x1f006;
+	MCHBAR32(0x4230 + 0x400 * channel) =
 		(max((ctrl->tFAW >> 2) + 1, ctrl->tRRD)
-		 << 10) | (ctrl->tRCD << 16) | 4);
-	write32(DEFAULT_MCHBAR + 0x4200 + 0x400 * channel,
-		(slotrank << 24) | 0x60000);
-	write32(DEFAULT_MCHBAR + 0x4210 + 0x400 * channel, 0x244);
+		 << 10) | (ctrl->tRCD << 16) | 4;
+	MCHBAR32(0x4200 + 0x400 * channel) =
+		(slotrank << 24) | 0x60000;
+	MCHBAR32(0x4210 + 0x400 * channel) = 0x244;
 
 	/* DRAM command WR */
-	write32(DEFAULT_MCHBAR + 0x4224 + 0x400 * channel, 0x1f201);
-	write32(DEFAULT_MCHBAR + 0x4234 + 0x400 * channel,
-		0x80011e0 |
-		((ctrl->tWTR + ctrl->CWL + 8) << 16));
-	write32(DEFAULT_MCHBAR + 0x4204 +
-		0x400 * channel, (slotrank << 24));
-	write32(DEFAULT_MCHBAR + 0x4214 +
-		0x400 * channel, 0x242);
+	MCHBAR32(0x4224 + 0x400 * channel) = 0x1f201;
+	MCHBAR32(0x4234 + 0x400 * channel) =
+		0x80011e0 | ((ctrl->tWTR + ctrl->CWL + 8) << 16);
+	MCHBAR32(0x4204 + 0x400 * channel) = slotrank << 24;
+	MCHBAR32(0x4214 + 0x400 * channel) = 0x242;
 
 	/* DRAM command RD */
-	write32(DEFAULT_MCHBAR + 0x4228 +
-		0x400 * channel, 0x1f105);
-	write32(DEFAULT_MCHBAR + 0x4238 +
-		0x400 * channel,
-		0x40011e0 | (max(ctrl->tRTP, 8) << 16));
-	write32(DEFAULT_MCHBAR + 0x4208 +
-		0x400 * channel, (slotrank << 24));
-	write32(DEFAULT_MCHBAR + 0x4218 +
-		0x400 * channel, 0x242);
+	MCHBAR32(0x4228 + 0x400 * channel) = 0x1f105;
+	MCHBAR32(0x4238 + 0x400 * channel) =
+		0x40011e0 | (max(ctrl->tRTP, 8) << 16);
+	MCHBAR32(0x4208 + 0x400 * channel) = slotrank << 24;
+	MCHBAR32(0x4218 + 0x400 * channel) = 0x242;
 
 	/* DRAM command PRE */
-	write32(DEFAULT_MCHBAR + 0x422c +
-		0x400 * channel, 0x1f002);
-	write32(DEFAULT_MCHBAR + 0x423c +
-		0x400 * channel,
-		0x1001 | (ctrl->tRP << 16));
-	write32(DEFAULT_MCHBAR + 0x420c +
-		0x400 * channel,
-		(slotrank << 24) | 0x60400);
-	write32(DEFAULT_MCHBAR + 0x421c +
-		0x400 * channel, 0);
+	MCHBAR32(0x422c + 0x400 * channel) = 0x1f002;
+	MCHBAR32(0x423c + 0x400 * channel) = 0x1001 | (ctrl->tRP << 16);
+	MCHBAR32(0x420c + 0x400 * channel) = (slotrank << 24) | 0x60400;
+	MCHBAR32(0x421c + 0x400 * channel) = 0;
 
-	write32(DEFAULT_MCHBAR + 0x4284 +
-		0x400 * channel, 0xc0001);
+	MCHBAR32(0x4284 + 0x400 * channel) = 0xc0001;
 	wait_428c(channel);
 }
 
@@ -2906,15 +2798,15 @@
 		upper[channel][slotrank][lane] = MAX_TIMC;
 	}
 
-	write32(DEFAULT_MCHBAR + 0x4ea8, 1);
+	MCHBAR32(0x4ea8) = 1;
 	printram("discover timC write:\n");
 
 	for (i = 0; i < 3; i++)
 		FOR_ALL_POPULATED_CHANNELS {
-			write32(DEFAULT_MCHBAR + 0xe3c + (channel * 0x100),
-				(rege3c_b24[i] << 24)
-				| (read32(DEFAULT_MCHBAR + 0xe3c + (channel * 0x100))
-				   & ~0x3f000000));
+			MCHBAR32(0xe3c + (channel * 0x100)) =
+				(rege3c_b24[i] << 24) |
+				(MCHBAR32(0xe3c + (channel * 0x100))
+				   & ~0x3f000000);
 			udelay(2);
 			for (pat = 0; pat < NUM_PATTERNS; pat++) {
 				FOR_ALL_POPULATED_RANKS {
@@ -2926,7 +2818,8 @@
 					statistics[MAX_TIMC] = 1;
 
 					fill_pattern5(ctrl, channel, pat);
-					write32(DEFAULT_MCHBAR + 0x4288 + 0x400 * channel, 0x1f);
+					MCHBAR32(0x4288 + 0x400 * channel) =
+						0x1f;
 					for (timC = 0; timC < MAX_TIMC; timC++) {
 						FOR_ALL_LANES
 							ctrl->timings[channel][slotrank].lanes[lane].timC = timC;
@@ -2969,13 +2862,12 @@
 		}
 
 	FOR_ALL_CHANNELS {
-		write32(DEFAULT_MCHBAR + (channel * 0x100) + 0xe3c,
-			0 | (read32(DEFAULT_MCHBAR + (channel * 0x100) + 0xe3c) &
-			     ~0x3f000000));
+		MCHBAR32((channel * 0x100) + 0xe3c) =
+			0 | (MCHBAR32((channel * 0x100) + 0xe3c) & ~0x3f000000);
 		udelay(2);
 	}
 
-	write32(DEFAULT_MCHBAR + 0x4ea8, 0);
+	MCHBAR32(0x4ea8) = 0;
 
 	printram("CPB\n");
 
@@ -3025,11 +2917,10 @@
 	int channel, slotrank;
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS {
-		write32(DEFAULT_MCHBAR + 0x0004 + (channel << 8) +
-			lane_registers[slotrank], make_mr0(ctrl, slotrank));
-		write32(DEFAULT_MCHBAR + 0x0008 + (channel << 8) +
-			lane_registers[slotrank],
-			make_mr1(ctrl, slotrank, channel));
+		MCHBAR32(0x0004 + (channel << 8) + lane_registers[slotrank]) =
+			make_mr0(ctrl, slotrank);
+		MCHBAR32(0x0008 + (channel << 8) + lane_registers[slotrank]) =
+			make_mr1(ctrl, slotrank, channel);
 	}
 }
 
@@ -3039,7 +2930,7 @@
 
 	slotrank = 0;
 	FOR_ALL_POPULATED_CHANNELS
-		if (read32(DEFAULT_MCHBAR + 0x42a0 + (channel << 10)) & 0xa000) {
+		if (MCHBAR32(0x42a0 + (channel << 10)) & 0xa000) {
 			printk(BIOS_EMERG, "Mini channel test failed (1): %d\n",
 			       channel);
 			return MAKE_ERR;
@@ -3047,45 +2938,45 @@
 	FOR_ALL_POPULATED_CHANNELS {
 		fill_pattern0(ctrl, channel, 0x12345678, 0x98765432);
 
-		write32(DEFAULT_MCHBAR + 0x4288 + (channel << 10), 0);
+		MCHBAR32(0x4288 + (channel << 10)) = 0;
 	}
 
 	for (slotrank = 0; slotrank < 4; slotrank++)
 		FOR_ALL_CHANNELS
 			if (ctrl->rankmap[channel] & (1 << slotrank)) {
 		FOR_ALL_LANES {
-			write32(DEFAULT_MCHBAR + (0x4f40 + 4 * lane), 0);
-			write32(DEFAULT_MCHBAR + (0x4d40 + 4 * lane), 0);
+			MCHBAR32(0x4f40 + 4 * lane) = 0;
+			MCHBAR32(0x4d40 + 4 * lane) = 0;
 		}
 		wait_428c(channel);
 		/* DRAM command ACT */
-		write32(DEFAULT_MCHBAR + 0x4220 + (channel << 10), 0x0001f006);
-		write32(DEFAULT_MCHBAR + 0x4230 + (channel << 10), 0x0028a004);
-		write32(DEFAULT_MCHBAR + 0x4200 + (channel << 10),
-			0x00060000 | (slotrank << 24));
-		write32(DEFAULT_MCHBAR + 0x4210 + (channel << 10), 0x00000244);
+		MCHBAR32(0x4220 + (channel << 10)) = 0x0001f006;
+		MCHBAR32(0x4230 + (channel << 10)) = 0x0028a004;
+		MCHBAR32(0x4200 + (channel << 10)) =
+			0x00060000 | (slotrank << 24);
+		MCHBAR32(0x4210 + (channel << 10)) = 0x00000244;
 		/* DRAM command WR */
-		write32(DEFAULT_MCHBAR + 0x4224 + (channel << 10), 0x0001f201);
-		write32(DEFAULT_MCHBAR + 0x4234 + (channel << 10), 0x08281064);
-		write32(DEFAULT_MCHBAR + 0x4204 + (channel << 10),
-			0x00000000 | (slotrank << 24));
-		write32(DEFAULT_MCHBAR + 0x4214 + (channel << 10), 0x00000242);
+		MCHBAR32(0x4224 + (channel << 10)) = 0x0001f201;
+		MCHBAR32(0x4234 + (channel << 10)) = 0x08281064;
+		MCHBAR32(0x4204 + (channel << 10)) =
+			0x00000000 | (slotrank << 24);
+		MCHBAR32(0x4214 + (channel << 10)) = 0x00000242;
 		/* DRAM command RD */
-		write32(DEFAULT_MCHBAR + 0x4228 + (channel << 10), 0x0001f105);
-		write32(DEFAULT_MCHBAR + 0x4238 + (channel << 10), 0x04281064);
-		write32(DEFAULT_MCHBAR + 0x4208 + (channel << 10),
-			0x00000000 | (slotrank << 24));
-		write32(DEFAULT_MCHBAR + 0x4218 + (channel << 10), 0x00000242);
+		MCHBAR32(0x4228 + (channel << 10)) = 0x0001f105;
+		MCHBAR32(0x4238 + (channel << 10)) = 0x04281064;
+		MCHBAR32(0x4208 + (channel << 10)) =
+			0x00000000 | (slotrank << 24);
+		MCHBAR32(0x4218 + (channel << 10)) = 0x00000242;
 		/* DRAM command PRE */
-		write32(DEFAULT_MCHBAR + 0x422c + (channel << 10), 0x0001f002);
-		write32(DEFAULT_MCHBAR + 0x423c + (channel << 10), 0x00280c01);
-		write32(DEFAULT_MCHBAR + 0x420c + (channel << 10),
-			0x00060400 | (slotrank << 24));
-		write32(DEFAULT_MCHBAR + 0x421c + (channel << 10), 0x00000240);
-		write32(DEFAULT_MCHBAR + 0x4284 + (channel << 10), 0x000c0001);
+		MCHBAR32(0x422c + (channel << 10)) = 0x0001f002;
+		MCHBAR32(0x423c + (channel << 10)) = 0x00280c01;
+		MCHBAR32(0x420c + (channel << 10)) =
+			0x00060400 | (slotrank << 24);
+		MCHBAR32(0x421c + (channel << 10)) = 0x00000240;
+		MCHBAR32(0x4284 + (channel << 10)) = 0x000c0001;
 		wait_428c(channel);
 		FOR_ALL_LANES
-			if (read32(DEFAULT_MCHBAR + 0x4340 + (channel << 10) + 4 * lane)) {
+			if (MCHBAR32(0x4340 + (channel << 10) + 4 * lane)) {
 				printk(BIOS_EMERG, "Mini channel test failed (2): %d, %d, %d\n",
 				       channel, slotrank, lane);
 				return MAKE_ERR;
@@ -3168,11 +3059,11 @@
 
 		dram_odt_stretch(ctrl, channel);
 
-		write32(DEFAULT_MCHBAR + 0x4008 + (channel << 10),
+		MCHBAR32(0x4008 + (channel << 10)) =
 			0x0a000000
 			| (b20 << 20)
 			| ((ctrl->ref_card_offset[channel] + 2) << 16)
-			| b4_8_12);
+			| b4_8_12;
 	}
 }
 
@@ -3180,8 +3071,8 @@
 {
 	int channel;
 	FOR_ALL_POPULATED_CHANNELS {
-		write32(DEFAULT_MCHBAR + (0x42a0 + 0x400 * channel),
-			0x00001000 | ctrl->rankmap[channel]);
+		MCHBAR32(0x42a0 + 0x400 * channel) =
+			0x00001000 | ctrl->rankmap[channel];
 		MCHBAR32(0x4004 + 0x400 * channel) &= ~0x20000000;	// OK
 	}
 }
@@ -3201,10 +3092,10 @@
 	int t3_ns;
 	u32 r32;
 
-	write32(DEFAULT_MCHBAR + 0x4cd4, 0x00000046);
+	MCHBAR32(0x4cd4) = 0x00000046;
 
-	write32(DEFAULT_MCHBAR + 0x400c, (read32(DEFAULT_MCHBAR + 0x400c) & 0xFFFFCFFF) | 0x1000);	// OK
-	write32(DEFAULT_MCHBAR + 0x440c, (read32(DEFAULT_MCHBAR + 0x440c) & 0xFFFFCFFF) | 0x1000);	// OK
+	MCHBAR32(0x400c) = (MCHBAR32(0x400c) & 0xFFFFCFFF) | 0x1000;	// OK
+	MCHBAR32(0x440c) = (MCHBAR32(0x440c) & 0xFFFFCFFF) | 0x1000;	// OK
 
 	if (is_mobile)
 		/* APD - DLL Off, 64 DCLKs until idle, decision per rank */
@@ -3213,40 +3104,35 @@
 		/* APD - PPD, 64 DCLKs until idle, decision per rank */
 		MCHBAR32(PM_PDWN_Config) = 0x00000340;
 
-	write32(DEFAULT_MCHBAR + 0x4380, 0x00000aaa);	// OK
-	write32(DEFAULT_MCHBAR + 0x4780, 0x00000aaa);	// OK
-	write32(DEFAULT_MCHBAR + 0x4f88, 0x5f7003ff);	// OK
-	write32(DEFAULT_MCHBAR + 0x5064, 0x00073000 | ctrl->reg_5064b0); // OK
+	MCHBAR32(0x4380) = 0x00000aaa;	// OK
+	MCHBAR32(0x4780) = 0x00000aaa;	// OK
+	MCHBAR32(0x4f88) = 0x5f7003ff;	// OK
+	MCHBAR32(0x5064) = 0x00073000 | ctrl->reg_5064b0; // OK
 
 	FOR_ALL_CHANNELS {
 		switch (ctrl->rankmap[channel]) {
 			/* Unpopulated channel.  */
 		case 0:
-			write32(DEFAULT_MCHBAR + 0x4384 + channel * 0x400, 0);
+			MCHBAR32(0x4384 + channel * 0x400) = 0;
 			break;
 			/* Only single-ranked dimms.  */
 		case 1:
 		case 4:
 		case 5:
-			write32(DEFAULT_MCHBAR + 0x4384 + channel * 0x400, 0x373131);
+			MCHBAR32(0x4384 + channel * 0x400) = 0x373131;
 			break;
 			/* Dual-ranked dimms present.  */
 		default:
-			write32(DEFAULT_MCHBAR + 0x4384 + channel * 0x400, 0x9b6ea1);
+			MCHBAR32(0x4384 + channel * 0x400) = 0x9b6ea1;
 			break;
 		}
 	}
 
-	write32 (DEFAULT_MCHBAR + 0x5880, 0xca9171e5);
-	write32 (DEFAULT_MCHBAR + 0x5888,
-		 (read32 (DEFAULT_MCHBAR + 0x5888) & ~0xffffff) | 0xe4d5d0);
-	write32 (DEFAULT_MCHBAR + 0x58a8, read32 (DEFAULT_MCHBAR + 0x58a8) & ~0x1f);
-	write32 (DEFAULT_MCHBAR + 0x4294,
-		 (read32 (DEFAULT_MCHBAR + 0x4294) & ~0x30000)
-		 | (1 << 16));
-	write32 (DEFAULT_MCHBAR + 0x4694,
-		 (read32 (DEFAULT_MCHBAR + 0x4694) & ~0x30000)
-		 | (1 << 16));
+	MCHBAR32(0x5880) = 0xca9171e5;
+	MCHBAR32(0x5888) = (MCHBAR32(0x5888) & ~0xffffff) | 0xe4d5d0;
+	MCHBAR32(0x58a8) = MCHBAR32(0x58a8) & ~0x1f;
+	MCHBAR32(0x4294) = (MCHBAR32(0x4294) & ~0x30000) | (1 << 16);
+	MCHBAR32(0x4694) = (MCHBAR32(0x4694) & ~0x30000) | (1 << 16);
 
 	MCHBAR32(0x5030) |= 1;	// OK
 	MCHBAR32(0x5030) |= 0x80;	// OK
@@ -3256,20 +3142,20 @@
 	FOR_ALL_POPULATED_CHANNELS
 		break;
 
-	t1_cycles = ((read32(DEFAULT_MCHBAR + 0x4290 + channel * 0x400) >> 8) & 0xff);
-	r32 = read32(DEFAULT_MCHBAR + 0x5064);
+	t1_cycles = (MCHBAR32(0x4290 + channel * 0x400) >> 8) & 0xff;
+	r32 = MCHBAR32(0x5064);
 	if (r32 & 0x20000)
 		t1_cycles += (r32 & 0xfff);
-	t1_cycles += (read32(DEFAULT_MCHBAR + channel * 0x400 + 0x42a4) & 0xfff);
+	t1_cycles += MCHBAR32(channel * 0x400 + 0x42a4) & 0xfff;
 	t1_ns = t1_cycles * ctrl->tCK / 256 + 544;
 	if (!(r32 & 0x20000))
 		t1_ns += 500;
 
-	t2_ns = 10 * ((read32(DEFAULT_MCHBAR + 0x5f10) >> 8) & 0xfff);
-	if ( read32(DEFAULT_MCHBAR + 0x5f00) & 8 )
+	t2_ns = 10 * ((MCHBAR32(0x5f10) >> 8) & 0xfff);
+	if (MCHBAR32(0x5f00) & 8)
 	{
-		t3_ns = 10 * ((read32(DEFAULT_MCHBAR + 0x5f20) >> 8) & 0xfff);
-		t3_ns += 10 * (read32(DEFAULT_MCHBAR + 0x5f18) & 0xff);
+		t3_ns = 10 * ((MCHBAR32(0x5f20) >> 8) & 0xfff);
+		t3_ns += 10 * (MCHBAR32(0x5f18) & 0xff);
 	}
 	else
 	{
@@ -3277,12 +3163,10 @@
 	}
 	printk(BIOS_DEBUG, "t123: %d, %d, %d\n",
 	       t1_ns, t2_ns, t3_ns);
-	write32 (DEFAULT_MCHBAR + 0x5d10,
-		 ((encode_5d10(t1_ns) + encode_5d10(t2_ns)) << 16)
-		 | (encode_5d10(t1_ns) << 8)
-		 | ((encode_5d10(t3_ns) + encode_5d10(t2_ns) + encode_5d10(t1_ns)) << 24)
-		 | (read32(DEFAULT_MCHBAR + 0x5d10) & 0xC0C0C0C0)
-		 | 0xc);
+	MCHBAR32(0x5d10) = ((encode_5d10(t1_ns) + encode_5d10(t2_ns)) << 16) |
+		(encode_5d10(t1_ns) << 8) | ((encode_5d10(t3_ns) +
+		encode_5d10(t2_ns) + encode_5d10(t1_ns)) << 24) |
+		(MCHBAR32(0x5d10) & 0xC0C0C0C0) | 0xc;
 }
 
 void restore_timings(ramctr_timing * ctrl)
@@ -3306,26 +3190,23 @@
 	}
 
 	FOR_ALL_CHANNELS FOR_ALL_POPULATED_RANKS FOR_ALL_LANES {
-		write32(DEFAULT_MCHBAR + 0x4080 + 0x400 * channel
-			+ 4 * lane, 0);
+		MCHBAR32(0x4080 + 0x400 * channel + 4 * lane) = 0;
 	}
 
 	FOR_ALL_POPULATED_CHANNELS
-	    write32(DEFAULT_MCHBAR + 0x4008 + 0x400 * channel,
-		    read32(DEFAULT_MCHBAR + 0x4008 +
-			   0x400 * channel) | 0x8000000);
+		MCHBAR32(0x4008 + 0x400 * channel) =
+			MCHBAR32(0x4008 + 0x400 * channel) | 0x8000000;
 
 	FOR_ALL_POPULATED_CHANNELS {
 		udelay (1);
-		write32(DEFAULT_MCHBAR + 0x4020 + 0x400 * channel,
-			read32(DEFAULT_MCHBAR + 0x4020 +
-			       0x400 * channel) | 0x200000);
+		MCHBAR32(0x4020 + 0x400 * channel) =
+			MCHBAR32(0x4020 + 0x400 * channel) | 0x200000;
 	}
 
 	printram("CPE\n");
 
-	write32(DEFAULT_MCHBAR + 0x3400, 0);
-	write32(DEFAULT_MCHBAR + 0x4eb0, 0);
+	MCHBAR32(0x3400) = 0;
+	MCHBAR32(0x4eb0) = 0;
 
 	printram("CP5b\n");
 
@@ -3369,14 +3250,13 @@
 
 	printram("CP5c\n");
 
-	write32(DEFAULT_MCHBAR + 0x3000, 0);
+	MCHBAR32(0x3000) = 0;
 
 	FOR_ALL_CHANNELS {
-		write32(DEFAULT_MCHBAR + (channel * 0x100) + 0xe3c,
-			0 | (read32(DEFAULT_MCHBAR + (channel * 0x100) + 0xe3c) &
-			     ~0x3f000000));
+		MCHBAR32(channel * 0x100 + 0xe3c) =
+			0 | (MCHBAR32(channel * 0x100 + 0xe3c) & ~0x3f000000);
 		udelay(2);
 	}
 
-	write32(DEFAULT_MCHBAR + 0x4ea8, 0);
+	MCHBAR32(0x4ea8) = 0;
 }