changes from AMD for making OLPC video work.

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2316 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 302 insertions, 60 deletions

diff --git a/src/northbridge/amd/gx2/northbridgeinit.c b/src/northbridge/amd/gx2/northbridgeinit.c
index 724b4de4c4..6d32aa2a7f 100644
--- a/src/northbridge/amd/gx2/northbridgeinit.c
+++ b/src/northbridge/amd/gx2/northbridgeinit.c
@@ -22,21 +22,21 @@ struct gliutable {
 };
 
 struct gliutable gliu0table[] = {
-	{.desc_name=MSR_GLIU0_BASE1, .desc_type= BM,.hi= MSR_MC + 0x0,.lo=  0x0FFF80},		/*  0-7FFFF to MC*/
-	{.desc_name=MSR_GLIU0_BASE2, .desc_type= BM,.hi= MSR_MC + 0x0,.lo=(0x80 << 20) + 0x0FFFE0},		/*  80000-9ffff to Mc*/
-	{.desc_name=MSR_GLIU0_SHADOW,.desc_type= SC_SHADOW,.hi=  MSR_MC + 0x0,.lo=  0x03},	/*  C0000-Fffff split to MC and PCI (sub decode) A0000-Bffff handled by SoftVideo*/
-	{.desc_name=MSR_GLIU0_SYSMEM,.desc_type= R_SYSMEM,.hi=  MSR_MC,.lo=  0x0},		/*  Catch and fix dynamicly.*/
-	{.desc_name=MSR_GLIU0_DMM,   .desc_type= BMO_DMM,.hi=  MSR_MC,.lo=  0x0},		/*  Catch and fix dynamicly.*/
-	{.desc_name=MSR_GLIU0_SMM,   .desc_type= BMO_SMM,.hi=  MSR_MC,.lo=  0x0},		/*  Catch and fix dynamicly.*/
+	{.desc_name=MSR_GLIU0_BASE1,  .desc_type= BM,.hi= MSR_MC + 0x0,.lo=  0x0FFF80},		/*  0-7FFFF to MC*/
+	{.desc_name=MSR_GLIU0_BASE2,  .desc_type= BM,.hi= MSR_MC + 0x0,.lo=(0x80 << 20) + 0x0FFFE0},		/*  80000-9ffff to Mc*/
+	{.desc_name=MSR_GLIU0_SHADOW, .desc_type= SC_SHADOW,.hi=  MSR_MC + 0x0,.lo=  0x03},	/*  C0000-Fffff split to MC and PCI (sub decode) A0000-Bffff handled by SoftVideo*/
+	{.desc_name=MSR_GLIU0_SYSMEM, .desc_type= R_SYSMEM,.hi=  MSR_MC,.lo=  0x0},		/*  Catch and fix dynamicly.*/
+	{.desc_name=MSR_GLIU0_DMM,    .desc_type= BMO_DMM,.hi=  MSR_MC,.lo=  0x0},		/*  Catch and fix dynamicly.*/
+	{.desc_name=MSR_GLIU0_SMM,    .desc_type= BMO_SMM,.hi=  MSR_MC,.lo=  0x0},		/*  Catch and fix dynamicly.*/
 	{.desc_name=GLIU0_GLD_MSR_COH,.desc_type= OTHER,.hi= 0x0,.lo= GL0_CPU},
-	{.desc_name=GL_END,          .desc_type= GL_END,.hi= 0x0,.lo= 0x0},
+	{.desc_name=GL_END,           .desc_type= GL_END,.hi= 0x0,.lo= 0x0},
 };
 
 
 struct gliutable gliu1table[] = {
 	{.desc_name=MSR_GLIU1_BASE1,.desc_type=  BM,.hi=  MSR_GL0 + 0x0,.lo=  0x0FFF80},	/*  0-7FFFF to MC*/
 	{.desc_name=MSR_GLIU1_BASE2,.desc_type=  BM,.hi=  MSR_GL0 + 0x0,.lo= (0x80 << 20) +0x0FFFE0},	/*  80000-9ffff to Mc*/
-	{.desc_name=MSR_GLIU1_SHADOW,.desc_type=  SC_SHADOW,.hi=  MSR_GL0 + 0x0,.lo=  0x03},/*  C0000-Fffff split to MC and PCI (sub decode)*/
+	{.desc_name=MSR_GLIU1_SHADOW,.desc_type=  SC_SHADOW,.hi=  MSR_GL0 + 0x0,.lo=  0x03}, /*  C0000-Fffff split to MC and PCI (sub decode)*/
 	{.desc_name=MSR_GLIU1_SYSMEM,.desc_type=  R_SYSMEM,.hi=  MSR_GL0,.lo=  0x0},		/*  Cat0xc and fix dynamicly.*/
 	{.desc_name=MSR_GLIU1_DMM,.desc_type=  BM_DMM,.hi=  MSR_GL0,.lo=  0x0},			/*  Cat0xc and fix dynamicly.*/
 	{.desc_name=MSR_GLIU1_SMM,.desc_type=  BM_SMM,.hi=  MSR_GL0,.lo=  0x0},			/*  Cat0xc and fix dynamicly.*/
@@ -81,7 +81,7 @@ struct msrinit ClockGatingAllOn[] = {
 
 	/*  Performance*/
 struct msrinit ClockGatingPerformance[] = {
-	{VG_GLD_MSR_PM,		{.hi=0x00,.lo=0x0000}},				/*  lotus #77.163*/
+	{VG_GLD_MSR_PM,		{.hi=0x00,.lo=0x0000}},		/*  lotus #77.163*/
 	{GP_GLD_MSR_PM,		{.hi=0x00,.lo=0x0001}},
 	{DF_GLD_MSR_PM,		{.hi=0x00,.lo=0x0155}},
 	{GLCP_GLD_MSR_PM,	{.hi=0x00,.lo=0x0015}},
@@ -91,14 +91,14 @@ struct msrinit ClockGatingPerformance[] = {
 /*  SET GeodeLink PRIORITY*/
 /* */
 struct msrinit GeodeLinkPriorityTable [] = {
-	{CPU_GLD_MSR_CONFIG,		{.hi=0x00,.lo=0x0220}},		/*  CPU Priority.*/
-	{DF_GLD_MSR_MASTER_CONF,	{.hi=0x00,.lo=0x0000}},		/*  DF Priority.*/
-	{VG_GLD_MSR_CONFIG,		{.hi=0x00,.lo=0x0720}},		/*  VG Primary and Secondary Priority.*/
-	{GP_GLD_MSR_CONFIG,		{.hi=0x00,.lo=0x0010}},		/*  Graphics Priority.*/
-	{GLPCI_GLD_MSR_CONFIG,		{.hi=0x00,.lo=0x0017}},		/*  GLPCI Priority + PID*/
-	{GLCP_GLD_MSR_CONF,		{.hi=0x00,.lo=0x0001}},		/*  GLCP Priority + PID*/
-	{VIP_GLD_MSR_CONFIG,		{.hi=0x00,.lo=0x0622}},		/*  VIP PID*/
-	{AES_GLD_MSR_CONFIG,		{.hi=0x00,.lo=0x0013}},		/*  AES PID*/
+	{CPU_GLD_MSR_CONFIG,		{.hi=0x00,.lo=0x0220}},	/*  CPU Priority.*/
+	{DF_GLD_MSR_MASTER_CONF,	{.hi=0x00,.lo=0x0000}},	/*  DF Priority.*/
+	{VG_GLD_MSR_CONFIG,		{.hi=0x00,.lo=0x0720}},	/*  VG Primary and Secondary Priority.*/
+	{GP_GLD_MSR_CONFIG,		{.hi=0x00,.lo=0x0010}},	/*  Graphics Priority.*/
+	{GLPCI_GLD_MSR_CONFIG,		{.hi=0x00,.lo=0x0017}},	/*  GLPCI Priority + PID*/
+	{GLCP_GLD_MSR_CONF,		{.hi=0x00,.lo=0x0001}},	/*  GLCP Priority + PID*/
+	{VIP_GLD_MSR_CONFIG,		{.hi=0x00,.lo=0x0622}},	/*  VIP PID*/
+	{AES_GLD_MSR_CONFIG,		{.hi=0x00,.lo=0x0013}},	/*  AES PID*/
 	{0x0FFFFFFFF, 			{0x0FFFFFFFF, 0x0FFFFFFFF}},	/*  END*/
 };
 
@@ -111,11 +111,11 @@ writeglmsr(struct gliutable *gl){
 
 	msr.lo = gl->lo;
 	msr.hi = gl->hi;
-	wrmsr(gl->desc_name, msr);
-	printk_debug("%s: write msr 0x%x, val 0x%x:0x%x\n", __FUNCTION__, gl->desc_name, msr.hi, msr.lo);
+	wrmsr(gl->desc_name, msr);	// MSR - see table above
+	printk_debug("%s: write msr 0x%08x, val 0x%08x:0x%08x\n", __FUNCTION__, gl->desc_name, msr.hi, msr.lo);
 	/* they do this, so we do this */
 	msr = rdmsr(gl->desc_name);
-	printk_debug("%s: AFTER write msr 0x%x, val 0x%x:0x%x\n", __FUNCTION__, gl->desc_name, msr.hi, msr.lo);
+	printk_debug("%s: AFTER write msr 0x%08x, val 0x%08x:0x%08x\n", __FUNCTION__, gl->desc_name, msr.hi, msr.lo);
 }
 
 static void
@@ -142,6 +142,10 @@ SysmemInit(struct gliutable *gl)
 	msr_t msr;
 	int sizembytes, sizebytes;
 
+	/* 
+	 * Figure out how much RAM is in the machine and alocate all to the 
+	 * system. We will adjust for SMM and DMM now and Frame Buffer later.
+	 */
 	sizembytes = sizeram();
 	printk_debug("%s: enable for %dm bytes\n", __FUNCTION__, sizembytes);
 	sizebytes = sizembytes << 20;
@@ -152,15 +156,15 @@ SysmemInit(struct gliutable *gl)
 		sizebytes -= DMM_SIZE * 1024 + 1;
 
 	sizebytes -= 1;
-	msr.hi = gl->hi | (sizebytes >> 24);
+	msr.hi = (gl->hi & 0xFFFFFF00) | (sizebytes >> 24);
 	/* set up sizebytes to fit into msr.lo */
-	sizebytes <<= 8; /* what? well, we want bits 23:12 in bytes 31:20. */
+	sizebytes <<= 8; /* what? well, we want bits 23:12 in bits 31:20. */
 	sizebytes &= 0xfff00000;
 	sizebytes |= 0x100;
 	msr.lo = sizebytes;
-	wrmsr(gl->desc_name, msr);
+	wrmsr(gl->desc_name, msr);	// MSR - see table above
 	msr = rdmsr(gl->desc_name);
-	printk_debug("%s: AFTER write msr 0x%x, val 0x%x:0x%x\n", __FUNCTION__, 
+	printk_debug("%s: AFTER write msr 0x%08x, val 0x%08x:0x%08x\n", __FUNCTION__, 
 				gl->desc_name, msr.hi, msr.lo);
 	
 }
@@ -177,7 +181,7 @@ DMMGL0Init(struct gliutable *gl) {
 
 	sizebytes -= DMM_SIZE*1024;
 	offset = sizebytes - DMM_OFFSET;
-	printk_debug("%s: offset is 0x%x\n", __FUNCTION__, offset);
+	printk_debug("%s: offset is 0x%08x\n", __FUNCTION__, offset);
 	offset >>= 12;
 	msr.hi = (gl->hi) | (offset << 8);
 	/* I don't think this is needed */
@@ -186,9 +190,9 @@ DMMGL0Init(struct gliutable *gl) {
 	msr.lo = DMM_OFFSET << 8;
 	msr.lo |= ((~(DMM_SIZE*1024)+1)>>12)&0xfffff;
 	
-	wrmsr(gl->desc_name, msr);
+	wrmsr(gl->desc_name, msr);	// MSR - See table above
 	msr = rdmsr(gl->desc_name);
-	printk_debug("%s: AFTER write msr 0x%x, val 0x%x:0x%x\n", __FUNCTION__, gl->desc_name, msr.hi, msr.lo);
+	printk_debug("%s: AFTER write msr 0x%08x, val 0x%08x:0x%08x\n", __FUNCTION__, gl->desc_name, msr.hi, msr.lo);
 	
 }
 static void
@@ -209,9 +213,9 @@ DMMGL1Init(struct gliutable *gl) {
 	printk_err("%s: warning, using DMM_SIZE even though AMD used SMM_SIZE\n", __FUNCTION__);
 	msr.lo |= ((~(DMM_SIZE*1024)+1)>>12)&0xfffff;
 	
-	wrmsr(gl->desc_name, msr);
+	wrmsr(gl->desc_name, msr);	// MSR - See table above
 	msr = rdmsr(gl->desc_name);
-	printk_debug("%s: AFTER write msr 0x%x, val 0x%x:0x%x\n", __FUNCTION__, gl->desc_name, msr.hi, msr.lo);
+	printk_debug("%s: AFTER write msr 0x%08x, val 0x%08x:0x%08x\n", __FUNCTION__, gl->desc_name, msr.hi, msr.lo);
 }
 static void
 SMMGL0Init(struct gliutable *gl) {
@@ -227,7 +231,7 @@ SMMGL0Init(struct gliutable *gl) {
 	printk_debug("%s: %d bytes\n", __FUNCTION__, sizebytes);
 
 	offset = sizebytes - SMM_OFFSET;
-	printk_debug("%s: offset is 0x%x\n", __FUNCTION__, offset);
+	printk_debug("%s: offset is 0x%08x\n", __FUNCTION__, offset);
 	offset >>= 12;
 
 	msr.hi = offset << 8;
@@ -236,9 +240,9 @@ SMMGL0Init(struct gliutable *gl) {
 	msr.lo = SMM_OFFSET << 8;
 	msr.lo |= ((~(SMM_SIZE*1024)+1)>>12)&0xfffff;
 	
-	wrmsr(gl->desc_name, msr);
+	wrmsr(gl->desc_name, msr);	// MSR - See table above
 	msr = rdmsr(gl->desc_name);
-	printk_debug("%s: AFTER write msr 0x%x, val 0x%x:0x%x\n", __FUNCTION__, gl->desc_name, msr.hi, msr.lo);
+	printk_debug("%s: AFTER write msr 0x%08x, val 0x%08x:0x%08x\n", __FUNCTION__, gl->desc_name, msr.hi, msr.lo);
 }
 static void
 SMMGL1Init(struct gliutable *gl) {
@@ -252,9 +256,9 @@ SMMGL1Init(struct gliutable *gl) {
 	msr.lo = SMM_OFFSET << 8;
 	msr.lo |= ((~(SMM_SIZE*1024)+1)>>12)&0xfffff;
 	
-	wrmsr(gl->desc_name, msr);
+	wrmsr(gl->desc_name, msr);	// MSR - See table above
 	msr = rdmsr(gl->desc_name);
-	printk_debug("%s: AFTER write msr 0x%x, val 0x%x:0x%x\n", __FUNCTION__, gl->desc_name, msr.hi, msr.lo);
+	printk_debug("%s: AFTER write msr 0x%08x, val 0x%08x:0x%08x\n", __FUNCTION__, gl->desc_name, msr.hi, msr.lo);
 }
 
 static void
@@ -263,11 +267,15 @@ GLIUInit(struct gliutable *gl){
 	while (gl->desc_type != GL_END){
 		switch(gl->desc_type){
 		default: 
+#if 01
+			/* For Unknown types: Write then read MSR */
+			writeglmsr(gl);
+#else
 				printk_err("%s: name %x, type %x, hi %x, lo %x: unsupported  type: ", __FUNCTION__, 
 							gl->desc_name, gl->desc_type, gl->hi, gl->hi);
 				printk_err("Must be %x, %x, %x, %x, %x, or %x\n", SC_SHADOW,R_SYSMEM,BMO_DMM,
 											BM_DMM, BMO_SMM,BM_SMM);
-	
+#endif	
 		case SC_SHADOW: /*  Check for a Shadow entry*/
 			ShadowInit(gl);
 			break;
@@ -276,7 +284,7 @@ GLIUInit(struct gliutable *gl){
 			SysmemInit(gl);
 			break;
 	
-		case 	BMO_DMM: /*  check for a DMM entry*/
+		case BMO_DMM: /*  check for a DMM entry*/
 			DMMGL0Init(gl);
 			break;
 	
@@ -317,12 +325,12 @@ static void GLPCIInit(void){
 	int i;
 	msr_t msr;
 	int msrnum;
-	unsigned long  val;
+
 	/* */
 	/*  R0 - GLPCI settings for Conventional Memory space.*/
 	/* */
 	msr.hi =  (0x09F000 >> 12) << GLPCI_RC_UPPER_TOP_SHIFT		/*  640*/;
-	msr.lo =  0													/*  0*/;
+	msr.lo =  0							/*  0*/;
 	msr.lo |= GLPCI_RC_LOWER_EN_SET+ GLPCI_RC_LOWER_PF_SET + GLPCI_RC_LOWER_WC_SET;
 	msrnum = GLPCI_RC0;
 	wrmsr(msrnum, msr);
@@ -349,7 +357,7 @@ static void GLPCIInit(void){
 		/* So we need a high page aligned addresss (pah) and low page aligned address (pal)
 		 * pah is from msr.hi << 12 | msr.low >> 20. pal is msr.lo << 12
 		 */
-		printk_debug("GLPCI r1: system msr.lo 0x%x msr.hi 0x%x\n", msr.lo, msr.hi);
+		printk_debug("GLPCI r1: system msr.lo 0x%08x msr.hi 0x%08x\n", msr.lo, msr.hi);
 		pah = ((msr.hi &0xff) << 12) | ((msr.lo >> 20) & 0xfff);
 		/* we have the page address. Now make it a page-aligned address */
 		pah <<= 12;
@@ -358,7 +366,7 @@ static void GLPCIInit(void){
 		msr.hi =  pah;
 		msr.lo =  pal;
 		msr.lo |= GLPCI_RC_LOWER_EN_SET | GLPCI_RC_LOWER_PF_SET | GLPCI_RC_LOWER_WC_SET;
-		printk_debug("GLPCI r1: system msr.lo 0x%x msr.hi 0x%x\n", msr.lo, msr.hi);
+		printk_debug("GLPCI r1: system msr.lo 0x%08x msr.hi 0x%08x\n", msr.lo, msr.hi);
 		msrnum = GLPCI_RC1;
 		wrmsr(msrnum, msr);
 	}
@@ -506,12 +514,12 @@ performance:
 
 	for(i = 0; gating->msrnum != 0xffffffff; i++) {
 		msr = rdmsr(gating->msrnum);
-		printk_debug("%s: MSR 0x%x is 0x%x:0x%x\n", __FUNCTION__, gating->msrnum, msr.hi, msr.lo);
+		printk_debug("%s: MSR 0x%08x is 0x%08x:0x%08x\n", __FUNCTION__, gating->msrnum, msr.hi, msr.lo);
 		msr.hi |= gating->msr.hi;
 		msr.lo |= gating->msr.lo;
-		printk_debug("%s: MSR 0x%x will be set to  0x%x:0x%x\n", __FUNCTION__, 
+		printk_debug("%s: MSR 0x%08x will be set to  0x%08x:0x%08x\n", __FUNCTION__, 
 			gating->msrnum, msr.hi, msr.lo);
-		wrmsr(gating->msrnum, msr);
+		wrmsr(gating->msrnum, msr);	// MSR - See the table above
 		gating +=1;
 	}
 
@@ -525,32 +533,251 @@ GeodeLinkPriority(void){
 
 	for(i = 0; prio->msrnum != 0xffffffff; i++) {
 		msr = rdmsr(prio->msrnum);
-		printk_debug("%s: MSR 0x%x is 0x%x:0x%x\n", __FUNCTION__, prio->msrnum, msr.hi, msr.lo);
+		printk_debug("%s: MSR 0x%08x is 0x%08x:0x%08x\n", __FUNCTION__, prio->msrnum, msr.hi, msr.lo);
 		msr.hi |= prio->msr.hi;
 		msr.lo &= ~0xfff;
 		msr.lo |= prio->msr.lo;
-		printk_debug("%s: MSR 0x%x will be set to  0x%x:0x%x\n", __FUNCTION__, 
+		printk_debug("%s: MSR 0x%08x will be set to 0x%08x:0x%08x\n", __FUNCTION__, 
 			prio->msrnum, msr.hi, msr.lo);
-		wrmsr(prio->msrnum, msr);
+		wrmsr(prio->msrnum, msr);	// MSR - See the table above
 		prio +=1;
 	}
 }
+
+
 	
-	/* ***************************************************************************/
-	/* **/
-	/* *	northBridgeInit*/
-	/* **/
-	/* *	Core Logic initialization:  Host bridge*/
-	/* **/
-	/* *	Entry:*/
-	/* *	Exit:*/
-	/* *	Modified:*/
-	/* **/
-	/* ***************************************************************************/
+/*
+ *	Get the GLIU0 shadow register settings
+ *	If the setShadow function is used then all shadow descriptors
+ *	  will stay sync'ed.
+ */
+static uint64_t getShadow(void)
+{
+	msr_t msr;
+	msr = rdmsr(MSR_GLIU0_SHADOW);
+	return ( ( (uint64_t) msr.hi ) << 32 ) | msr.lo;
+}
+
+
+/*
+ *	Set the cache RConf registers for the memory hole.
+ *	Keeps all cache shadow descriptors sync'ed.
+ *	This is part of the PCI lockup solution
+ *	Entry: EDX:EAX is the shadow settings
+ */
+static void setShadowRCONF(uint32_t shadowHi, uint32_t shadowLo)
+{
+	// ok this is whacky bit translation time.
+	int bit;
+	uint8_t shadowByte;
+	msr_t msr;
+	shadowByte = (uint8_t) (shadowLo >> 16);
+
+	// load up D000 settings in edx.
+	for (bit = 8; (bit > 4); bit--) {
+		msr.hi <<= 8;
+		msr.hi |= 1;						// cache disable PCI/Shadow memory
+		if (shadowByte && (1 << bit))
+			msr.hi |= 0x20;					// write serialize PCI memory
+	}
+
+	// load up C000 settings in eax.
+	for ( ; bit; bit--) {
+		msr.lo <<= 8;
+		msr.lo |= 1;						// cache disable PCI/Shadow memory
+		if (shadowByte && (1 << bit))
+			msr.lo |= 0x20;					// write serialize PCI memory
+	}
+
+	wrmsr(CPU_RCONF_C0_DF, msr);
+
+	shadowByte = (uint8_t) (shadowLo >> 24);
+
+	// load up F000 settings in edx.
+	for (bit = 8; (bit > 4); bit--) {
+		msr.hi <<= 8;
+		msr.hi |= 1;						// cache disable PCI/Shadow memory
+		if (shadowByte && (1 << bit))
+			msr.hi |= 0x20;					// write serialize PCI memory
+	}
+
+	// load up E000 settings in eax.
+	for ( ; bit; bit--) {
+		msr.lo <<= 8;
+		msr.lo |= 1;						// cache disable PCI/Shadow memory
+		if (shadowByte && (1 << bit))
+			msr.lo |= 0x20;					// write serialize PCI memory
+	}
+
+	wrmsr(CPU_RCONF_E0_FF, msr);
+}
+
+
+/*
+ *	Set the GLPCI registers for the memory hole.
+ *	Keeps all cache shadow descriptors sync'ed.
+ *	Entry: EDX:EAX is the shadow settings
+ */
+static void setShadowGLPCI(uint32_t shadowHi, uint32_t shadowLo)
+{
+	msr_t msr;
+	
+// Set the Enable Register.
+
+	msr = rdmsr(GLPCI_REN);
+	msr.lo &= 0xFFFF00FF;
+	msr.lo |= ( (shadowLo & 0xFFFF0000) >> 8);
+	wrmsr(GLPCI_REN, msr);
+}
+
+
+/*
+ *	Set the GLIU SC register settings. Scans descriptor tables for SC_SHADOW.
+ *	Keeps all shadow descriptors sync'ed.
+ *	Entry: EDX:EAX is the shadow settings
+ */
+static void setShadow(uint64_t shadowSettings)
+{
+	int i;
+	msr_t msr;
+	struct gliutable* pTable;
+	uint32_t shadowLo, shadowHi;
+
+	shadowLo = (uint32_t) shadowSettings;
+	shadowHi = (uint32_t) (shadowSettings >> 32);
+
+	setShadowRCONF(shadowHi, shadowLo);
+	setShadowGLPCI(shadowHi, shadowLo);
+
+	for(i = 0; gliutables[i]; i++) {
+		for (pTable = gliutables[i]; pTable->desc_type != GL_END; pTable++) {
+			if (pTable->desc_type == SC_SHADOW) {
+
+				msr = rdmsr(pTable->desc_name);
+				msr.lo = (uint32_t) shadowSettings;
+				msr.hi &= 0xFFFF0000;		// maintain PDID in upper EDX
+				msr.hi |= ((uint32_t) (shadowSettings >> 32)) & 0x0000FFFF;
+				wrmsr(pTable->desc_name, msr);	// MSR - See the table above
+
+			}
+		}
+	}
+}
+
+/**************************************************************************
+ *
+ *	shadowRom
+ *
+ *	Set up a stack for ease of further testing
+ *
+ *	Entry:
+ *	Exit:
+ *	Destroys:
+ *
+ **************************************************************************/
+static void 
+shadowRom(void)
+{
+	uint64_t shadowSettings = getShadow();
+	shadowSettings &= (uint64_t) 0xFFFF00000000FFFFULL;	// Disable read & writes
+	shadowSettings |= (uint64_t) 0x00000000F0000000ULL;	// Enable reads for F0000-FFFFF
+	setShadow(shadowSettings);
+}
+
+
+
+/***************************************************************************
+ *
+ * RCONFInit
+ *	  Set up RCONF_DEFAULT and any other RCONF registers needed
+ *
+ *  DEVRC_RCONF_DEFAULT:
+ *  ROMRC(63:56) = 04h	 ; write protect ROMBASE
+ *  ROMBASE(36:55) = 0FFFC0h ; Top of PCI/bottom of rom chipselect area
+ *  DEVRC(35:28) =  39h	 ; cache disabled in PCI memory + WS bit on + Write Combine + write burst.
+ *  SYSTOP(27:8) = top of system memory
+ *  SYSRC(7:0) = 00h 		 ; writeback, can set to 08h to make writethrough 
+ *
+ ***************************************************************************/
+#define SYSMEM_RCONF_WRITETHROUGH 8
+#define DEVRC_RCONF_DEFAULT 0x21
+#define ROMBASE_RCONF_DEFAULT 0xFFFC0000
+#define ROMRC_RCONF_DEFAULT 0x25
+
+static void
+RCONFInit(void)
+{
+	struct gliutable *gl = 0;
+	int i;
+	msr_t msr;
+	uint8_t SysMemCacheProp;
+	uint8_t RegionProp;
+
+	/* Locate SYSMEM entry in GLIU0table */
+	for(i = 0; gliu0table[i].desc_name != GL_END; i++) {
+		if (gliu0table[i].desc_type == R_SYSMEM) {
+			gl = &gliu0table[i];
+			break;
+		}
+	}
+	if (gl == 0) {
+		post_code(0xCE);		/* POST_RCONFInitError */
+		while (1);
+	}
+
+// sysdescfound:	
+	/* found the descriptor... get its contents */
+	msr = rdmsr(gl->desc_name);
+
+	/* 20 bit address -  The bottom 12 bits go into bits 20-31 in eax, the 
+	 * top 8 bits go into 0-7 of edx. 
+	 */
+	msr.lo = (msr.lo & 0xFFFFFF00) | (msr.hi & 0xFF);
+	msr.lo = ((msr.lo << 12) | (msr.lo >> 20)) & 0x000FFFFF;
+	msr.lo <<= RCONF_DEFAULT_LOWER_SYSTOP_SHIFT;	// 8
+	
+	// Set Default SYSMEM region properties
+	msr.lo &= ~SYSMEM_RCONF_WRITETHROUGH;	// 8 (or ~8)
+
+	// Set PCI space cache properties
+	msr.hi = (DEVRC_RCONF_DEFAULT >> 4);	// only need the bottom bits and lets clean the rest of edx
+	msr.lo |= (DEVRC_RCONF_DEFAULT << 28);
+
+	// Set the ROMBASE. This is usually FFFC0000h
+	msr.hi |= (ROMBASE_RCONF_DEFAULT >> 12) << RCONF_DEFAULT_UPPER_ROMBASE_SHIFT;
+
+	// Set ROMBASE cache properties.
+	msr.hi |= ((ROMRC_RCONF_DEFAULT >> 8) | (ROMRC_RCONF_DEFAULT << 24));
+	
+	// now program RCONF_DEFAULT
+	wrmsr(CPU_RCONF_DEFAULT, msr);
+
+	// RCONF_BYPASS: Cache tablewalk properties and SMM/DMM header access properties.
+	// Set to match system memory cache properties.
+	msr = rdmsr(CPU_RCONF_DEFAULT);
+	SysMemCacheProp = (uint8_t) (msr.lo & 0xFF);
+	msr = rdmsr(CPU_RCONF_BYPASS);
+	msr.lo = (msr.lo & 0xFFFF0000) | (SysMemCacheProp << 8) | SysMemCacheProp;
+	wrmsr(CPU_RCONF_BYPASS, msr);
+}
+
+
+/* ***************************************************************************/
+/* **/
+/* *	northBridgeInit*/
+/* **/
+/* *	Core Logic initialization:  Host bridge*/
+/* **/
+/* *	Entry:*/
+/* *	Exit:*/
+/* *	Modified:*/
+/* **/
+/* ***************************************************************************/
 
 void
 northbridgeinit(void)
 {
+	msr_t msr;
 	int i;
 	printk_debug("Enter %s\n", __FUNCTION__);
 
@@ -558,10 +785,25 @@ northbridgeinit(void)
 		GLIUInit(gliutables[i]);
 
 	GeodeLinkPriority();
-
-
+	
+	shadowRom();
+	
+	// GeodeROM ensures that the BIOS waits the required 1 second before 
+	// allowing anything to access PCI
+	// PCIDelay();
+	
+	RCONFInit();
+	
+	// The cacheInit function in GeodeROM tests cache and, among other things,
+	// makes sure all INVD instructions are treated as WBINVD.  We do this
+	// because we've found some programs which require this behavior.
+	// That subset of cacheInit() is implemented here:
+	msr = rdmsr(CPU_DM_CONFIG0);
+	msr.lo |= DM_CONFIG0_LOWER_WBINVD_SET;
+	wrmsr(CPU_DM_CONFIG0, msr);
+	
 	/*  Now that the descriptor to memory is set up.*/
-	/*  The memory controller needs one read to synch it's lines before it can be used.*/
+	/*  The memory controller needs one read to synch its lines before it can be used.*/
 	i = *(int *) 0;
 
 	GLPCIInit();