diff --git a/src/mainboard/amd/rumba/auto.c b/src/mainboard/amd/rumba/auto.c
index b3a9b839ee..fbc272ffd0 100644
--- a/src/mainboard/amd/rumba/auto.c
+++ b/src/mainboard/amd/rumba/auto.c
@@ -102,22 +102,6 @@ static void sdram_set_spd_registers(const struct mem_controller *ctrl)
 #include "northbridge/amd/gx2/pll_reset.c"
 #include "cpu/amd/model_gx2/cpureginit.c"
 #include "cpu/amd/model_gx2/syspreinit.c"
-static void msr_init(void)
-{
-	/* total physical memory */
-	__builtin_wrmsr(0x1808,  0x10f3bf00, 0x22fffc02);
-
-	/* traditional memory 0kB-512kB, 512kB-1MB */
-	__builtin_wrmsr(0x10000020, 0xfff80, 0x20000000);
-        __builtin_wrmsr(0x10000021, 0x80fffe0, 0x20000000);
-
-        __builtin_wrmsr(0x40000020, 0xfff80, 0x20000000);
-        __builtin_wrmsr(0x40000021, 0x80fffe0, 0x20000000);
-
-	/* put code in northbridge[init].c here */
-}
-
-
 static void main(unsigned long bist)
 {
 	static const struct mem_controller memctrl [] = {
@@ -125,8 +109,6 @@ static void main(unsigned long bist)
 	};
 
 	SystemPreInit();
-	
-
 	w83627hf_enable_serial(SERIAL_DEV, TTYS0_BASE);
 	uart_init();
 	console_init();
@@ -140,8 +122,6 @@ static void main(unsigned long bist)
 	
 	sdram_initialize(1, memctrl);
 
-	msr_init();
-
 	/* Check all of memory */
 	//ram_check(0x00000000, 640*1024);
 }
diff --git a/src/mainboard/olpc/rev_a/Config.lb b/src/mainboard/olpc/rev_a/Config.lb
index a7962f51d0..8c5d98388a 100644
--- a/src/mainboard/olpc/rev_a/Config.lb
+++ b/src/mainboard/olpc/rev_a/Config.lb
@@ -133,6 +133,7 @@ chip northbridge/amd/gx2
     		device pci 1.0 on end
 		device pci 1.1 on end
       		chip southbridge/amd/cs5536
+                        register "enable_gpio0_inta" = "1"
         		device pci d.0 on end	# Realtek 8139 LAN
         		device pci f.0 on end	# ISA Bridge
         		device pci f.2 on end	# IDE Controller
diff --git a/src/northbridge/amd/gx2/raminit.c b/src/northbridge/amd/gx2/raminit.c
index 636c60b9d2..f93109a746 100644
--- a/src/northbridge/amd/gx2/raminit.c
+++ b/src/northbridge/amd/gx2/raminit.c
@@ -4,6 +4,157 @@ static void sdram_set_registers(const struct mem_controller *ctrl)
 {
 }
 
+/* here is programming for the various MSRs.*/
+#define IM_QWAIT 0x100000
+
+#define DMCF_WRITE_SERIALIZE_REQUEST (2<<12) /* 2 outstanding */ /* in high */
+#define DMCF_SERIAL_LOAD_MISSES  (2) /* enabled */
+
+/* these are the 8-bit attributes for controlling RCONF registers */
+#define CACHE_DISABLE (1<<0)
+#define WRITE_ALLOCATE (1<<1)
+#define WRITE_PROTECT (1<<2)
+#define WRITE_THROUGH (1<<3)
+#define WRITE_COMBINE (1<<4)
+#define WRITE_SERIALIZE (1<<5)
+
+/* ram has none of this stuff */
+#define RAM_PROPERTIES (0)
+#define DEVICE_PROPERTIES (WRITE_SERIALIZE|CACHE_DISABLE)
+#define ROM_PROPERTIES (WRITE_SERIALIZE|WRITE_THROUGH|CACHE_DISABLE)
+#define MSR_WS_CD_DEFAULT (0x21212121)
+
+/* 1810-1817 give you 8 registers with which to program protection regions */
+/* the are region configuration range registers, or RRCF */
+/* in msr terms, the are a straight base, top address assign, since they are 4k aligned. */
+/* so no left-shift needed for top or base */
+#define RRCF_LOW(base,properties) (base|(1<<8)|properties)
+#define RRCF_LOW_CD(base)	RRCF_LOW(base, CACHE_DISABLE)
+
+/* build initializer for P2D MSR */
+#define P2D_BM(msr, pdid1, bizarro, pbase, pmask) {msr, .hi=(pdid1<<29)|(bizarro<<28)|(pbase>>24), .lo=(pbase<<8)|pmask}
+#define P2D_BMO(msr, pdid1, bizarro, poffset, pbase, pmask) {msr, .hi=(pdid1<<29)|(bizarro<<28)|(poffset<<8)|(pbase>>24), .lo=(pbase<<8)|pmask}
+#define P2D_R(msr, pdid1, bizarro, pmax, pmin) {msr, .hi=(pdid1<<29)|(bizarro<<28)|(pmax>>12), .lo=(pmax<<20)|pmin}
+#define P2D_RO(msr, pdid1, bizarro, poffset, pmax, pmin) {msr, .hi=(pdid1<<29)|(bizarro<<28)|(poffset<<8)|(pmax>>12), .lo=(pmax<<20)|pmin}
+#define P2D_SC(msr, pdid1, bizarro, wen, ren,pscbase) {msr, .hi=(pdid1<<29)|(bizarro<<28)|(wen), .lo=(ren<<16)|(pscbase>>18)}
+#define IOD_BM(msr, pdid1, bizarro, ibase, imask) {msr, .hi=(pdid1<<29)|(bizarro<<28)|(ibase>>12), .lo=(ibase<<20)|imask}
+#define IOD_SC(msr, pdid1, bizarro, en, wen, ren, ibase) {msr, .hi=(pdid1<<29)|(bizarro<<28), .lo=(en<<24)|(wen<<21)|(ren<<20)|(ibase<<3)}
+
+
+
+struct msr_defaults {
+	int msr_no;
+	unsigned long hi, lo;
+};
+const struct msr_defaults  msr_defaults [] = {
+	{0x1700, .hi = 0, .lo = IM_QWAIT},
+	{0x1800, .hi = DMCF_WRITE_SERIALIZE_REQUEST, .lo = DMCF_SERIAL_LOAD_MISSES},
+	/* 1808 will be done down below, so we have to do 180a->1817 (well, 1813 really) */
+	/* for 180a, for now, we assume VSM will configure it */
+	/* 180b is left at reset value,a0000-bffff is non-cacheable */
+	/* 180c, c0000-dffff is set to write serialize and non-cachable */
+	/* oops, 180c will be set by cpu bug handling in cpubug.c */
+	//{0x180c, .hi = MSR_WS_CD_DEFAULT, .lo = MSR_WS_CD_DEFAULT},
+	/* 180d is left at default, e0000-fffff is non-cached */
+
+	/* we will assume 180e, the ssm region configuration, is left at default or set by VSM */
+	/* we will not set 0x180f, the DMM,yet */
+	//{0x1810, .hi=0xee7ff000, .lo=RRCF_LOW(0xee000000, WRITE_COMBINE|CACHE_DISABLE)},
+	//{0x1811, .hi = 0xefffb000, .lo = RRCF_LOW_CD(0xefff8000)},
+	//{0x1812, .hi = 0xefff7000, .lo = RRCF_LOW_CD(0xefff4000)},
+	//{0x1813, .hi = 0xefff3000, .lo = RRCF_LOW_CD(0xefff0000)},
+	/* now for GLPCI routing */
+	/* GLIU0 */
+	P2D_BM(0x10000020, 0x1, 0x0, 0x0, 0xfff80),
+	P2D_BM(0x10000021, 0x1, 0x0, 0x80000, 0xfffe0),
+	P2D_SC(0x1000002c, 0x1, 0x0, 0x0,  0xff03, 0x3),
+	/* GLIU1 */
+	P2D_BM(0x40000020, 0x1, 0x0, 0x0, 0xfff80),
+	P2D_BM(0x40000021, 0x1, 0x0, 0x80000, 0xfffe0),
+	P2D_SC(0x4000002d, 0x1, 0x0, 0x0,  0xff03, 0x3),
+	{0}
+};
+
+#define SMM_OFFSET 0x40400000
+#define SMM_SIZE   256
+
+/* we have to do this here. We have not found a nicer way to do it */
+void
+setup_gx2(void)
+{
+	int i;
+	unsigned long tmp, tmp2, tmp3;
+	msr_t msr;
+	unsigned long sizem, membytes;
+#if 0
+	sizem = setup_gx2_cache();
+
+	membytes = sizem * 1048576;
+
+	/* we need to set 0x10000028 and 0x40000029 */
+	//	print_debug("sizem 0x%x, membytes 0x%x\n", sizem, membytes);
+	msr.hi = 0x20000000 | membytes>>24;
+	msr.lo = 0x100 | ( ((membytes >>12) & 0xfff) << 20);
+	wrmsr(0x10000028, msr);
+	msr.hi = 0x20000000 | membytes>>24;
+	msr.lo = 0x100 | ( ((membytes >>12) & 0xfff) << 20);
+	wrmsr(0x40000029, msr);
+	msr = rdmsr(0x10000028);
+	//	print_debug("MSR 0x%x is now 0x%x:0x%x\n", 0x10000028, msr.hi,msr.lo);
+	msr = rdmsr(0x40000029);
+	//	print_debug("MSR 0x%x is now 0x%x:0x%x\n", 0x40000029, msr.hi,msr.lo);
+
+
+	/* fixme: SMM MSR 0x10000026 and 0x400000023 */
+	/* calculate the OFFSET field */
+	tmp = membytes - SMM_OFFSET;
+	tmp >>= 12;
+	tmp <<= 8;
+	tmp |= 0x20000000;
+	tmp |= (SMM_OFFSET >> 24);
+
+	/* calculate the PBASE and PMASK fields */
+	tmp2 = (SMM_OFFSET << 8) & 0xFFF00000; /* shift right 12 then left 20  == left 8 */
+	tmp2 |= (((~(SMM_SIZE * 1024) + 1) >> 12) & 0xfffff);
+	//	print_debug("MSR 0x%x is now 0x%x:0x%x\n", 0x10000026, tmp, tmp2);
+	msr.hi = tmp;
+	msr.lo = tmp2;
+	wrmsr(0x10000026, msr);
+#else
+	msr.hi = 0x2000000f;
+	msr.lo = 0xfbf00100;
+	wrmsr(0x10000028, msr);
+	msr = rdmsr(0x10000028);
+	//	print_debug("MSR 0x%x is now 0x%x:0x%x\n", 0x10000028, msr.hi, msr.lo);
+	wrmsr(0x40000029, msr);
+	msr = rdmsr(0x40000029);
+	//	print_debug("MSR 0x%x is now 0x%x:0x%x\n", 0x40000029, msr.hi, msr.lo);
+
+	msr.hi = 0x2cfbc040;
+	msr.lo = 0x400fffc0;
+	wrmsr(0x10000026, msr);
+	msr = rdmsr(0x10000026);
+	//	print_debug("MSR 0x%x is now 0x%x:0x%x\n", 0x10000026, msr.hi, msr.lo);
+
+	msr.hi = 0x22fffc02;
+	msr.lo = 0x10ffbf00;
+	wrmsr(0x1808, msr);
+	msr = rdmsr(0x1808);
+	//	print_debug("MSR 0x%x is now 0x%x:0x%x\n", 0x1808, msr.hi, msr.lo);
+#endif
+	/* now do the default MSR values */
+
+	wrmsr(msr_defaults[0].msr_no, msr);
+	for(i = 0; msr_defaults[i].msr_no; i++) {
+		//		msr_t msr;
+		msr.lo = msr_defaults[i].lo;
+		msr.hi = msr_defaults[i].hi;
+		wrmsr(msr_defaults[i].msr_no, msr);
+		//msr = rdmsr(msr_defaults[i].msr_no);
+		//		print_debug("MSR 0x%x is now 0x%x:0x%x\n", msr_defaults[i].msr_no, msr.hi,msr.lo);
+	}
+}
+
 /* Section 6.1.3, LX processor databooks, BIOS Initialization Sequence
  * Section 4.1.4, GX/CS5535 GeodeROM Porting guide */
 static void sdram_enable(int controllers, const struct mem_controller *ctrl)
@@ -95,5 +246,5 @@ static void sdram_enable(int controllers, const struct mem_controller *ctrl)
 	wrmsr(0x4c00000f, msr);
 
 	/* DRAM working now?? */
-
+	setup_gx2();
 }
diff --git a/src/southbridge/amd/cs5536/cs5536.c b/src/southbridge/amd/cs5536/cs5536.c
index 37c54d5c50..ebe99cf395 100644
--- a/src/southbridge/amd/cs5536/cs5536.c
+++ b/src/southbridge/amd/cs5536/cs5536.c
@@ -29,11 +29,13 @@ static void southbridge_enable(struct device *dev)
 		msr.lo = sb->lpc_serirq_enable;
 		msr.hi  = 0;
 		wrmsr(MDD_LPC_SIRQ, msr);
+		printk_debug("Enabled LPC SERIRQ 0x%x\n", msr.lo);
 	}
 	if (sb->lpc_irq) {
 		msr.lo = sb->lpc_irq;
 		msr.hi = 0;
 		wrmsr(MDD_IRQM_LPC, msr);
+		printk_debug("Enabled  lpc irq values 0x%x\n", msr.lo);
 	}
 
 	if (sb->enable_gpio0_inta){
@@ -47,6 +49,7 @@ static void southbridge_enable(struct device *dev)
 		/* magic stuff */
 		outl(0x3081, GPIOL_INPUT_INVERT_ENABLE);
 		outl(GPIOL_0_SET, GPIO_MAPPER_X);
+		printk_debug("Enabled GPIO0 INTa\n");
 	}
 		
 	
diff --git a/targets/amd/rumba/Config.nofallback.lb b/targets/amd/rumba/Config.nofallback.lb
index 10169c92ea..8d6ba90ef1 100644
--- a/targets/amd/rumba/Config.nofallback.lb
+++ b/targets/amd/rumba/Config.nofallback.lb
@@ -28,9 +28,9 @@ romimage "fallback"
 #	payload ../../../../../lnxieepro100.ebia
 #	payload /etc/hosts
 #	payload /home/hamish/work/etherboot/eb-5.2.6-lne100.elf
-#	payload /tmp/filo.elf
-	payload /home/ollie/work/filo-0.4.1/filo.elf
+	payload /tmp/filo.elf
+#	payload /home/ollie/work/filo-0.4.1/filo.elf
 end
 
 #buildrom ./linuxbios.rom ROM_SIZE "normal" "fallback"
-buildrom ./linuxbios.rom ROM_SIZE "fallback"
\ No newline at end of file
+buildrom ./linuxbios.rom ROM_SIZE "fallback"