extra.c

// This is the extra stuff added to the memtest+ from memtest.org
// Code from Eric Nelson and Wee
// (Checked without vendor-specific optimization before adding)
/* extra.c -
 *
 * Released under version 2 of the Gnu Public License.
 *
 */

#include "test.h"
#include "screen_buffer.h"
#include "pci.h"
#include "extra.h"

static int ctrl = -1;

struct memory_controller {
	unsigned vendor;
	unsigned device;
	int worked;
	void (*change_timing)(int cas, int rcd, int rp, int ras);
};

static struct memory_controller mem_ctr[] = {

	/* AMD 64*/
	{ 0x1022, 0x1100,  1, change_timing_amd64}, //AMD64 hypertransport link

	/* nVidia */
	{ 0x10de, 0x01E0,  0, change_timing_nf2},  // nforce2

	/* Intel */
	{ 0x8086, 0x2570,  0, change_timing_i875}, //Intel i848/i865
	{ 0x8086, 0x2578,  0, change_timing_i875}, //Intel i875P
	{ 0x8086, 0x2580,  0, change_timing_i925}, //Intel i915P/G
	{ 0x8086, 0x2584,  0, change_timing_i925}, //Intel i925X
	{ 0x8086, 0x2770,  0, change_timing_i925}, //Intel Lakeport
	{ 0x8086, 0x3580,  0, change_timing_i852}, //Intel i852GM - i855GM/GME (But not i855PM)
};

struct drc {
	unsigned t_rwt;
	unsigned t_wrt;
	unsigned t_ref;
	unsigned t_en2t;
	unsigned t_rwqb;
	unsigned t_rct;
	unsigned t_rrd;
	unsigned t_wr;
};

static struct drc a64;

void find_memctr(void)  // Basically copy from the find_controller function
{
	unsigned long vendor;
	unsigned long device;
	unsigned long a64;
	int i= 0;
	int result;

	result = pci_conf_read(0, 0, 0, PCI_VENDOR_ID, 2, &vendor);
	result = pci_conf_read(0, 0, 0, PCI_DEVICE_ID, 2, &device);

	pci_conf_read(0, 24, 0, 0x00, 4, &a64);

	if( a64 == 0x11001022) 	{
		ctrl = 0;
		return;
	}

	if (result == 0) {
		for(i = 1; i < sizeof(mem_ctr)/sizeof(mem_ctr[0]); i++) {
			if ((mem_ctr[i].vendor == vendor) &&
				(mem_ctr[i].device == device))
			{
				ctrl = i;
				return;
			}
		}
	}
	ctrl = -1;
}

void a64_parameter(void)
{

	ulong dramtlr;

	if ( 0 == pci_conf_read(0, 24, 2, 0x88, 4, &dramtlr) )
	{
		a64.t_rct = 7 + ((dramtlr>>4) & 0x0F);
		a64.t_rrd = 0 + ((dramtlr>>16) & 0x7);
		a64.t_wr  = 2 + ((dramtlr>>28) & 0x1);
	}

	if ( 0 == pci_conf_read(0, 24, 2, 0x8C, 4, &dramtlr) )
	{
		a64.t_rwt = 1 + ((dramtlr>>4) & 0x07);
		a64.t_wrt = 1 +  (dramtlr      & 0x1);
		a64.t_ref = 1 + ((dramtlr>>11) & 0x3);
	}

	if ( 0 == pci_conf_read(0, 24, 2, 0x90, 4, &dramtlr) )
	{
		a64.t_en2t = 1 + ((dramtlr>>28) & 0x1);
		a64.t_rwqb = 2 << ((dramtlr>>14) & 0x3);
	}
}



void change_timing(int cas, int rcd, int rp, int ras)
{
	find_memctr();
	if ((ctrl == -1) || ( ctrl > sizeof(mem_ctr)/sizeof(mem_ctr[0])))
	{
		return;
	}

	mem_ctr[ctrl].change_timing(cas, rcd, rp, ras);
	restart();
}

void amd64_option()
{
	int rwt=0, wrt=0, ref=0, en2t=0, rct=0, rrd=0, rwqb=0, wr = 0, flag=0;

	if ((ctrl == -1) || ( ctrl > sizeof(mem_ctr)/sizeof(mem_ctr[0])))
	{
		return;
	}

	if (mem_ctr[ctrl].worked)
	{
		a64_parameter();
		cprint(POP_Y+1, POP_X+4, "AMD64 options");

		cprint(POP_Y+3, POP_X+4, "(1) Rd-Wr Delay   : ");
		dprint(POP_Y+3, POP_X+24, a64.t_rwt, 2, 0);

		cprint(POP_Y+4, POP_X+4, "(2) Wr-Rd Delay   : ");
		dprint(POP_Y+4, POP_X+24, a64.t_wrt, 2, 0);

		cprint(POP_Y+5, POP_X+4, "(3) Rd/Wr Bypass  : ");
		dprint(POP_Y+5, POP_X+24, a64.t_rwqb, 2, 0);

		cprint(POP_Y+6, POP_X+4, "(4) Refresh Rate  : ");
		switch ( a64.t_ref)
		{
		case 1 : cprint(POP_Y+6, POP_X+23, "15.6us"); break;
		case 2 : cprint(POP_Y+6, POP_X+23, " 7.8us"); break;
		case 3 : cprint(POP_Y+6, POP_X+23, " 3.9us"); break;
		}
		cprint(POP_Y+7, POP_X+4,  "(5) Command Rate  :");
		dprint(POP_Y+7, POP_X+24, a64.t_en2t, 2, 0);
		cprint(POP_Y+7, POP_X+26, "T ");

		cprint(POP_Y+8, POP_X+4,  "(6) Row Cycle Time: ");
		dprint(POP_Y+8, POP_X+24, a64.t_rct, 2, 0);

		cprint(POP_Y+9, POP_X+4, "(7) RAS-RAS Delay : ");
		dprint(POP_Y+9, POP_X+24, a64.t_rrd, 2, 0);

		cprint(POP_Y+10, POP_X+4, "(8) Write Recovery: ");
		dprint(POP_Y+10, POP_X+24, a64.t_wr, 2, 0);

		cprint(POP_Y+11, POP_X+4,"(0) Cancel   ");

		while(!flag)
		{
			switch(get_key())
			{
			case 2:
				popclear();
				// read-to-write delay
				cprint(POP_Y+3, POP_X+4, "Rd-Wr delay ");
				cprint(POP_Y+4, POP_X+4, " (2 - 6 cycles)");
				cprint(POP_Y+5, POP_X+4, "Current: ");
				dprint(POP_Y+5, POP_X+14, a64.t_rwt, 4, 0);
				cprint(POP_Y+7, POP_X+4, "New: ");
				rwt = getval(POP_Y+7, POP_X+12, 0);
				amd64_tweak(rwt, wrt, ref,en2t, rct, rrd, rwqb, wr);
				break;

			case 3:
				popclear();
				// read-to-write delay
				cprint(POP_Y+3, POP_X+4, "Wr-Rd delay ");
				cprint(POP_Y+4, POP_X+4, " (1 - 2 cycles)");
				cprint(POP_Y+5, POP_X+4, "Current: ");
				dprint(POP_Y+5, POP_X+14, a64.t_wrt, 4, 0);
				cprint(POP_Y+7, POP_X+4, "New: ");
				wrt = getval(POP_Y+7, POP_X+12, 0);
				amd64_tweak(rwt, wrt, ref,en2t, rct, rrd, rwqb, wr);
				break;

			case 4:
				popclear();
				// Read write queue bypass count
				cprint(POP_Y+3, POP_X+4, "Rd/Wr bypass ");
				cprint(POP_Y+4, POP_X+4, " (2, 4 or 8 )");
				cprint(POP_Y+5, POP_X+4, "Current: ");
				dprint(POP_Y+5, POP_X+14, a64.t_rwqb, 2, 0);
				cprint(POP_Y+7, POP_X+4, "New: ");
				rwqb = getval(POP_Y+7, POP_X+11, 0);
				amd64_tweak(rwt, wrt, ref,en2t, rct, rrd, rwqb, wr);
				break;

			case 5:
				popclear();
				// refresh rate
				cprint(POP_Y+3, POP_X+4, "Refresh rate ");
				cprint(POP_Y+4, POP_X+4, "Current: ");
				switch ( a64.t_ref){
				case 1 : cprint(POP_Y+4, POP_X+14, "15.6us"); break;
				case 2 : cprint(POP_Y+4, POP_X+14, "7.8us "); break;
				case 3 : cprint(POP_Y+4, POP_X+14, "3.9us "); break;
				}
				cprint(POP_Y+6, POP_X+4, "New: ");
				cprint(POP_Y+7, POP_X+4, "(1) 15.6us");
				cprint(POP_Y+8, POP_X+4, "(2) 7.8us ");
				cprint(POP_Y+9, POP_X+4, "(3) 3.9us ");
				ref = getval(POP_Y+6, POP_X+11, 0);
				amd64_tweak(rwt, wrt, ref,en2t, rct, rrd, rwqb, wr);
				break;

			case 6:
				popclear();
				//Enable 2T command and addressing
				cprint(POP_Y+3, POP_X+4, "Command rate:");
				cprint(POP_Y+5, POP_X+4, "(1) 1T "); //only supoprted by CG revision and later
				cprint(POP_Y+6, POP_X+4, "(2) 2T ");
				en2t = getval(POP_Y+3, POP_X+22, 0);
				amd64_tweak(rwt, wrt, ref,en2t, rct, rrd, rwqb, wr);
				break;

			case 7:
				popclear();
				//Row cycle time
				cprint(POP_Y+3, POP_X+4, "Row cycle time: ");
				cprint(POP_Y+4, POP_X+4, " (7 - 20 cycles)");
				cprint(POP_Y+5, POP_X+4, "Current: ");
				dprint(POP_Y+5, POP_X+14, a64.t_rct, 4, 0);
				cprint(POP_Y+7, POP_X+4, "New: ");
				rct = getval(POP_Y+7, POP_X+12, 0);
				amd64_tweak(rwt, wrt, ref,en2t, rct, rrd, rwqb, wr);
				break;

			case 8:
				popclear();
				//Active-to-Active RAS Delay
				cprint(POP_Y+3, POP_X+4, "RAS-RAS Delay: ");
				cprint(POP_Y+4, POP_X+4, " (2 - 4 cycles)");
				cprint(POP_Y+5, POP_X+4, "Current: ");
				dprint(POP_Y+5, POP_X+14, a64.t_rrd, 2, 0);
				cprint(POP_Y+7, POP_X+4, "New: ");
				rrd = getval(POP_Y+7, POP_X+12, 0);
				amd64_tweak(rwt, wrt, ref,en2t, rct, rrd, rwqb, wr);
				break;

			case 9:
				popclear();
				//Active-to-Active RAS Delay
				cprint(POP_Y+3, POP_X+4, "Write Recovery: ");
				cprint(POP_Y+4, POP_X+4, " (2 - 3 cycles)");
				cprint(POP_Y+5, POP_X+4, "Current: ");
				dprint(POP_Y+5, POP_X+14, a64.t_wr, 2, 0);
				cprint(POP_Y+7, POP_X+4, "New: ");
				wr = getval(POP_Y+7, POP_X+12, 0);
				amd64_tweak(rwt, wrt, ref,en2t, rct, rrd, rwqb, wr);
				break;

			case 11:
			case 57:
				flag++;
				/* 0/CR - Cancel */
				break;
			}
		}
	}
}

void get_option()
{
	int cas =0, rp=0, rcd=0, ras=0, sflag = 0 ;

	while(!sflag)
	{
		switch(get_key())
		{
		case 2:
			popclear();
			cas = get_cas();
			popclear();

			cprint(POP_Y+3, POP_X+8, "tRCD: ");
			rcd = getval(POP_Y+3, POP_X+15, 0);
			popclear();

			cprint(POP_Y+3, POP_X+8, "tRP: ");
			rp = getval(POP_Y+3, POP_X+15, 0);
			popclear();

			cprint(POP_Y+3, POP_X+8, "tRAS: ");
			ras = getval(POP_Y+3, POP_X+15, 0);
			popclear();
			change_timing(cas, rcd, rp, ras);
			break;

		case 3:
			popclear();
			cas = get_cas();
			change_timing(cas, 0, 0, 0);
			sflag++;
			break;

		case 4:
			popclear();
			cprint(POP_Y+3, POP_X+8, "tRCD: ");
			rcd =getval(POP_Y+3, POP_X+15, 0);
			change_timing(0, rcd, 0, 0);
			sflag++;
			break;

		case 5:
			popclear();
			cprint(POP_Y+3, POP_X+8, "tRP: ");
			rp =getval(POP_Y+3, POP_X+15, 0);
			change_timing(0, 0, rp, 0);
			sflag++;
			break;

		case 6:
			popclear();
			cprint(POP_Y+3, POP_X+8, "tRAS: ");
			ras =getval(POP_Y+3, POP_X+15, 0);
			change_timing(0, 0, 0, ras);
			sflag++;
			break;

		case 7:
			popclear();
			amd64_option();
			sflag++;
			popclear();
			break;

		case 8:
			break;

		case 11:
		case 57:
			sflag++;
			/* 0/CR - Cancel */
			break;
		}
	}
}

void get_option_1()
{
	int rp=0, rcd=0, ras=0, sflag = 0 ;

	while(!sflag)
	{
		switch(get_key())
		{
		case 2:
			popclear();
			cprint(POP_Y+3, POP_X+8, "tRCD: ");
			rcd = getval(POP_Y+3, POP_X+15, 0);
			popclear();

			cprint(POP_Y+3, POP_X+8, "tRP: ");
			rp = getval(POP_Y+3, POP_X+15, 0);
			popclear();

			cprint(POP_Y+3, POP_X+8, "tRAS: ");
			ras = getval(POP_Y+3, POP_X+15, 0);
			popclear();
			change_timing(0, rcd, rp, ras);
			break;

		case 3:
			popclear();
			cprint(POP_Y+3, POP_X+8, "tRCD: ");
			rcd =getval(POP_Y+3, POP_X+15, 0);
			change_timing(0, rcd, 0, 0);
			break;

		case 4:
			popclear();
			cprint(POP_Y+3, POP_X+8, "tRP: ");
			rp =getval(POP_Y+3, POP_X+15, 0);
			change_timing(0, 0, rp, 0);
			break;

		case 5:
			popclear();
			cprint(POP_Y+3, POP_X+8, "tRAS: ");
			ras =getval(POP_Y+3, POP_X+15, 0);
			change_timing(0, 0, 0, ras);
			break;

		case 6:
			popclear();
			amd64_option();
			sflag++;
			popclear();
			break;

		case 7:
			break;

		case 11:
		case 57:
			sflag++;
			/* 0/CR - Cancel */
			break;
		}
	}
}


void get_menu(void)
{
	int menu ;

	find_memctr();

	switch(ctrl)
	{
	case 0: menu = 2;	break;
	case 1:
	case 2:
	case 3:
	case 4:	menu = 0;	break;
	case 5: menu = 1;	break;
	case 6: menu = 0;	break;
	default: menu = -1;	break;
	}

	if (menu == -1)
	{
		popclear();
	}
	else if (menu == 0)
	{
		cprint(POP_Y+1, POP_X+2, "Modify Timing:");
		cprint(POP_Y+3, POP_X+5, "(1) Modify All   ");
		cprint(POP_Y+4, POP_X+5, "(2) Modify tCAS  ");
		cprint(POP_Y+5, POP_X+5, "(3) Modify tRCD  ");
		cprint(POP_Y+6, POP_X+5, "(4) Modify tRP   ");
		cprint(POP_Y+7, POP_X+5, "(5) Modify tRAS  ");
		cprint(POP_Y+8, POP_X+5, "(0) Cancel");
		wait_keyup();
	 	get_option();
	}
	else if (menu == 1)
	{
		cprint(POP_Y+1, POP_X+2, "Modify Timing:");
		cprint(POP_Y+3, POP_X+5, "(1) Modify All   ");
		cprint(POP_Y+4, POP_X+5, "(2) Modify tRCD  ");
		cprint(POP_Y+5, POP_X+5, "(3) Modify tRP   ");
		cprint(POP_Y+6, POP_X+5, "(4) Modify tRAS  ");
		cprint(POP_Y+7, POP_X+5, "(0) Cancel");
		wait_keyup();
	 	get_option();
	}
	else  // AMD64 special menu
	{
		cprint(POP_Y+1, POP_X+2, "Modify Timing:");
		cprint(POP_Y+3, POP_X+5, "(1) Modify All   ");
		cprint(POP_Y+4, POP_X+5, "(2) Modify tRCD  ");
		cprint(POP_Y+5, POP_X+5, "(3) Modify tRP   ");
		cprint(POP_Y+6, POP_X+5, "(4) Modify tRAS  ");
		cprint(POP_Y+7, POP_X+5, "(5) AMD64 Options");
		cprint(POP_Y+8, POP_X+5, "(0) Cancel");
		wait_keyup();
	 	get_option_1();
	}
}

int get_cas(void)
{
	int i852=0, cas=0;
	ulong drc, ddr;
	long *ptr;

	switch(ctrl)
	{
	case 0: ddr = 1; break;
	case 1:
	case 2:
	case 3:	ddr = 1; break;
	case 4:
		pci_conf_read( 0, 0, 0, 0x44, 4, &ddr);
		ddr &= 0xFFFFC000;
		ptr=(long*)(ddr+0x120);
		drc = *ptr;

		if ((drc & 3) == 2) ddr = 2;
		else ddr = 1;
		break;
	case 5: ddr = 2; break;
	case 6: ddr = 1; i852 = 1; break;
	default: ddr = 1;
	}

	if (ddr == 1)
	{
		cprint(POP_Y+3, POP_X+8, "tCAS:  ");
		cprint(POP_Y+5, POP_X+8, "(1) CAS 2.5 ");
		cprint(POP_Y+6, POP_X+8, "(2) CAS 2   ");
		if(!i852) {
			cprint(POP_Y+7, POP_X+8, "(3) CAS 3   ");
		}
		cas = getval(POP_Y+3, POP_X+15, 0);
	}
	else if (ddr == 2)
	{
		cprint(POP_Y+3, POP_X+8, "tCAS:  ");
		cprint(POP_Y+5, POP_X+8, "(1) CAS 4 ");
		cprint(POP_Y+6, POP_X+8, "(2) CAS 3 ");
		cprint(POP_Y+7, POP_X+8, "(3) CAS 5 ");
		cas = getval(POP_Y+3, POP_X+15, 0);
	}
	else
	{
		cas = -1;
	}

	popclear();
	return (cas);
}

/////////////////////////////////////////////////////////
// here we go for the exciting timing change part...   //
/////////////////////////////////////////////////////////

void change_timing_i852(int cas, int rcd, int rp, int ras) {

	ulong dramtlr;
	ulong int1, int2;

	pci_conf_read(0, 0, 1, 0x60, 4, &dramtlr);

	// CAS Latency (tCAS)
	int1 = dramtlr & 0xFF9F;
	if      (cas == 2) { int2 = int1 ^ 0x20; }
	else if (cas == 1) { int2 = int1; }
	else		   { int2 = dramtlr; }


	// RAS-To-CAS (tRCD)
	int1 = int2 & 0xFFF3;
	if      (rcd == 2) { int2 = int1 ^ 0x8; }
	else if (rcd == 3) { int2 = int1 ^ 0x4; }
	else if (rcd == 4) { int2 = int1; }
	// else		   { int2 = int2; }


	// RAS Precharge (tRP)
	int1 = int2 & 0xFFFC;
	if      (rp == 2) { int2 = int1 ^ 0x2; }
	else if (rp == 3) { int2 = int1 ^ 0x1; }
	else if (rp == 4) { int2 = int1; }
	// else		  { int2 = int2; }


	// RAS Active to precharge (tRAS)
	int1 = int2 & 0xF9FF;
	if      (ras == 5)  { int2 = int1 ^ 0x0600; }
	else if (ras == 6)  { int2 = int1 ^ 0x0400; }
	else if (ras == 7)  { int2 = int1 ^ 0x0200; }
	else if (ras == 8)  { int2 = int1; }
	// else		    { int2 = int2; }

	pci_conf_write(0, 0, 1, 0x60, 4, int2);
	__delay(500);
}

void change_timing_i925(int cas, int rcd, int rp, int ras)
{
	ulong int1, dev0, temp;
	long *ptr;

	//read MMRBAR
	pci_conf_read( 0, 0, 0, 0x44, 4, &dev0);
	dev0 &= 0xFFFFC000;

	ptr=(long*)(dev0+0x114);
	temp = *ptr;

	// RAS-To-CAS (tRCD)
	int1 = temp | 0x70;
	if      (rcd == 2) { temp = int1 ^ 0x70; }
	else if (rcd == 3) { temp = int1 ^ 0x60; }
	else if (rcd == 4) { temp = int1 ^ 0x50; }
	else if (rcd == 5) { temp = int1 ^ 0x40; }
	// else		   { temp = temp;}

	//RAS precharge (tRP)
	int1 = temp | 0x7;
	if      (rp == 2) { temp = int1 ^ 0x7; }
	else if (rp == 3) { temp = int1 ^ 0x6; }
	else if (rp == 4) { temp = int1 ^ 0x5; }
	else if (rp == 5) { temp = int1 ^ 0x4; }
	// else		  { temp = temp;}

	if (mem_ctr[ctrl].device == 0x2770 )	// Lakeport?
	{
		// RAS Active to precharge (tRAS)
		int1 = temp | 0xF80000;	// bits 23:19
		if      (ras == 4)  { temp = int1 ^ 0xD80000; }
		else if (ras == 5)  { temp = int1 ^ 0xD00000; }
		else if (ras == 6)  { temp = int1 ^ 0xC80000; }
		else if (ras == 7)  { temp = int1 ^ 0xC00000; }
		else if (ras == 8)  { temp = int1 ^ 0xB80000; }
		else if (ras == 9)  { temp = int1 ^ 0xB00000; }
		else if (ras == 10) { temp = int1 ^ 0xA80000; }
		else if (ras == 11) { temp = int1 ^ 0xA00000; }
		else if (ras == 12) { temp = int1 ^ 0x980000; }
		else if (ras == 13) { temp = int1 ^ 0x900000; }
		else if (ras == 14) { temp = int1 ^ 0x880000; }
		else if (ras == 15) { temp = int1 ^ 0x800000; }
		// else		    { temp = temp;}
	}
	else
	{
		// RAS Active to precharge (tRAS)
		int1 = temp | 0xF00000;	// bits 23:20
		if      (ras == 4)  { temp = int1 ^ 0xB00000; }
		else if (ras == 5)  { temp = int1 ^ 0xA00000; }
		else if (ras == 6)  { temp = int1 ^ 0x900000; }
		else if (ras == 7)  { temp = int1 ^ 0x800000; }
		else if (ras == 8)  { temp = int1 ^ 0x700000; }
		else if (ras == 9)  { temp = int1 ^ 0x600000; }
		else if (ras == 10) { temp = int1 ^ 0x500000; }
		else if (ras == 11) { temp = int1 ^ 0x400000; }
		else if (ras == 12) { temp = int1 ^ 0x300000; }
		else if (ras == 13) { temp = int1 ^ 0x200000; }
		else if (ras == 14) { temp = int1 ^ 0x100000; }
		else if (ras == 15) { temp = int1 ^ 0x000000; }
		// else		    { temp = temp;}
	}

	// CAS Latency (tCAS)
	int1 = temp | 0x0300;
	if      (cas == 1) { temp = int1 ^ 0x200; }   // cas 2.5
	else if (cas == 2) { temp = int1 ^ 0x100; }
	else if (cas == 3) { temp = int1 ^ 0x300; }
	// else		   { temp = temp;}

	*ptr = temp;
	__delay(500);
	return;
}

void change_timing_Lakeport(int cas, int rcd, int rp, int ras)
{
	ulong int1, dev0, temp;
	long *ptr;

	//read MMRBAR
	pci_conf_read( 0, 0, 0, 0x44, 4, &dev0);
	dev0 &= 0xFFFFC000;

	ptr=(long*)(dev0+0x114);
	temp = *ptr;

	// RAS-To-CAS (tRCD)
	int1 = temp | 0x70;
	if      (rcd == 2) { temp = int1 ^ 0x70; }
	else if (rcd == 3) { temp = int1 ^ 0x60; }
	else if (rcd == 4) { temp = int1 ^ 0x50; }
	else if (rcd == 5) { temp = int1 ^ 0x40; }
	// else		   { temp = temp;}

	//RAS precharge (tRP)
	int1 = temp | 0x7;
	if      (rp == 2) { temp = int1 ^ 0x7; }
	else if (rp == 3) { temp = int1 ^ 0x6; }
	else if (rp == 4) { temp = int1 ^ 0x5; }
	else if (rp == 5) { temp = int1 ^ 0x4; }
	// else		  { temp = temp;}


	// CAS Latency (tCAS)
	int1 = temp | 0x0300;
	if      (cas == 1) { temp = int1 ^ 0x200; }   // cas 2.5
	else if (cas == 2) { temp = int1 ^ 0x100; }
	else if (cas == 3) { temp = int1 ^ 0x300; }
	// else		   { temp = temp;}

	*ptr = temp;
	__delay(500);
	return;
}

void change_timing_i875(int cas, int rcd, int rp, int ras){

	ulong int1, dev6, temp;
	long *ptr;

	/* Read the MMR Base Address & Define the pointer from the BAR6 overflow register */
	pci_conf_read( 0, 6, 0, 0x10, 4, &dev6);

	ptr=(long*)(dev6+0x60);

	temp = *ptr;

	// RAS-To-CAS (tRCD)
	int1 = temp | 0xC;
	if      (rcd == 2) { temp = int1 ^ 0x4; }
	else if (rcd == 3) { temp = int1 ^ 0x8; }
	else if (rcd == 4) { temp = int1 ^ 0xC; }
	else if (rcd == 5) { temp = int1 ^ 0xC; }
	// else		   { temp = temp;}


	//RAS precharge (tRP)
	int1 = temp | 0x3;
	if      (rp == 2) { temp = int1 ^ 0x1; }
	else if (rp == 3) { temp = int1 ^ 0x2; }
	else if (rp == 4) { temp = int1 ^ 0x3; }
	else if (rp == 5) { temp = int1 ^ 0x3; }
	// else		  { temp = temp;}


	// RAS Active to precharge (tRAS)
	int1 = temp | 0x380;
	if      (ras == 5)  { temp = int1 ^ 0x100; }
	else if (ras == 6)  { temp = int1 ^ 0x180; }
	else if (ras == 7)  { temp = int1 ^ 0x200; }
	else if (ras == 8)  { temp = int1 ^ 0x280; }
	else if (ras == 9)  { temp = int1 ^ 0x300; }
	else if (ras == 10) { temp = int1 ^ 0x380; }
	// else		    { temp = temp;}

	// CAS Latency (tCAS)
	int1 = temp | 0x60;
	if      (cas == 1) { temp = int1 ^ 0x60; }   // cas 2.5
	else if (cas == 2) { temp = int1 ^ 0x40; }
	else if (cas == 3) { temp = int1 ^ 0x20; }
	// else		   { temp = temp; }

	*ptr = temp;
	__delay(500);
	return;
}


void change_timing_nf2(int cas, int rcd, int rp, int ras) {

	ulong dramtlr, dramtlr2;
	ulong int1, int2;

	pci_conf_read(0, 0, 1, 0x90, 4, &dramtlr);
	pci_conf_read(0, 0, 1, 0xA0, 4, &dramtlr2);


	// CAS Latency (tCAS)
	int1 = dramtlr2 | 0x0070;
	if      (cas == 1) { int2 = int1 ^ 0x10; }  // cas = 2.5
	else if (cas == 2) { int2 = int1 ^ 0x50; }
	else if (cas == 3) { int2 = int1 ^ 0x40; }
	else		   { int2 = dramtlr2; }

	pci_conf_write(0, 0, 1, 0xA0, 4, int2);

	// RAS-To-CAS (tRCD)

	int1 = dramtlr | 0x700000;
	if      (rcd == 2) { int2 = int1 ^ 0x500000; }
	else if (rcd == 3) { int2 = int1 ^ 0x400000; }
	else if (rcd == 4) { int2 = int1 ^ 0x300000; }
	else if (rcd == 5) { int2 = int1 ^ 0x200000; }
	else if (rcd == 6) { int2 = int1 ^ 0x100000; }
	else		   { int2 = dramtlr;}


	// RAS Precharge (tRP)
	int1 = int2 | 0x70000000;
	if      (rp == 2) { int2 = int1 ^ 0x50000000; }
	else if (rp == 3) { int2 = int1 ^ 0x40000000; }
	else if (rp == 4) { int2 = int1 ^ 0x30000000; }
	else if (rp == 5) { int2 = int1 ^ 0x20000000; }
	else if (rp == 6) { int2 = int1 ^ 0x10000000; }
	// else		  { int2 = int2;}


	// RAS Active to precharge (tRAS)

	int1 = int2 | 0x78000;
	if      (ras == 4)  { int2 = int1 ^ 0x58000; }
	else if (ras == 5)  { int2 = int1 ^ 0x50000; }
	else if (ras == 6)  { int2 = int1 ^ 0x48000; }
	else if (ras == 7)  { int2 = int1 ^ 0x40000; }
	else if (ras == 8)  { int2 = int1 ^ 0x38000; }
	else if (ras == 9)  { int2 = int1 ^ 0x30000; }
	else if (ras == 10) { int2 = int1 ^ 0x28000; }
	else if (ras == 11) { int2 = int1 ^ 0x20000; }
	else if (ras == 12) { int2 = int1 ^ 0x18000; }
	else if (ras == 13) { int2 = int1 ^ 0x10000; }
	else if (ras == 14) { int2 = int1 ^ 0x08000; }
	// else		    { int2 = int2;}


	pci_conf_write(0, 0, 1, 0x90, 4, int2);
	__delay(500);
}


void change_timing_amd64(int cas, int rcd, int rp, int ras) {

	ulong dramtlr;
	ulong int1= 0x0;

	pci_conf_read(0, 24, 2, 0x88, 4, &dramtlr);

	// RAS-To-CAS (tRCD)
	int1 = dramtlr | 0x7000;
	if      (rcd == 2) { dramtlr = int1 ^ 0x5000; }
	else if (rcd == 3) { dramtlr = int1 ^ 0x4000; }
	else if (rcd == 4) { dramtlr = int1 ^ 0x3000; }
	else if (rcd == 5) { dramtlr = int1 ^ 0x2000; }
	else if (rcd == 6) { dramtlr = int1 ^ 0x1000; }
	else if (rcd == 1) { dramtlr = int1 ^ 0x6000; }
	// else		   { dramtlr = dramtlr;}


	//RAS precharge (tRP)
	int1 = dramtlr | 0x7000000;
	if      (rp == 2) { dramtlr = int1 ^ 0x5000000; }
	else if (rp == 3) { dramtlr = int1 ^ 0x4000000; }
	else if (rp == 1) { dramtlr = int1 ^ 0x6000000; }
	else if (rp == 4) { dramtlr = int1 ^ 0x3000000; }
	else if (rp == 5) { dramtlr = int1 ^ 0x2000000; }
	else if (rp == 6) { dramtlr = int1 ^ 0x1000000; }
	// else		  { dramtlr = dramtlr;}


	// RAS Active to precharge (tRAS)
	int1 = dramtlr | 0xF00000;
	if      (ras == 5)  { dramtlr = int1 ^ 0xA00000; }
	else if (ras == 6)  { dramtlr = int1 ^ 0x900000; }
	else if (ras == 7)  { dramtlr = int1 ^ 0x800000; }
	else if (ras == 8)  { dramtlr = int1 ^ 0x700000; }
	else if (ras == 9)  { dramtlr = int1 ^ 0x600000; }
	else if (ras == 10) { dramtlr = int1 ^ 0x500000; }
	else if (ras == 11) { dramtlr = int1 ^ 0x400000; }
	else if (ras == 12) { dramtlr = int1 ^ 0x300000; }
	else if (ras == 13) { dramtlr = int1 ^ 0x200000; }
	else if (ras == 14) { dramtlr = int1 ^ 0x100000; }
	// else		    { dramtlr = dramtlr;}


	// CAS Latency (tCAS)
	int1 = dramtlr | 0x7;	// some changes will cause the system hang, tried Draminit to no avail
	if      (cas == 1) { dramtlr = int1 ^ 0x2; }   // cas 2.5
	else if (cas == 2) { dramtlr = int1 ^ 0x6; }
	else if (cas == 3) { dramtlr = int1 ^ 0x5; }
	else if (cas == 4) { dramtlr = int1 ^ 0x7; } //cas 1.5 on a64
	// else		   { dramtlr = dramtlr; }

//	pci_conf_read(0, 24, 2, 0x90, 4, &dramcr);// use dram init
	pci_conf_write(0, 24, 2, 0x88, 4, dramtlr);
	__delay(500);

////////////////////////////////////////////////////////////////
// trying using the draminit, but do not work
}

// copy from lib.c code to add delay to chipset timing modification
void __delay(ulong loops)
{
	int d0;
	__asm__ __volatile__(
		"\tjmp 1f\n"
		".align 16\n"
		"1:\tjmp 2f\n"
		".align 16\n"
		"2:\tdecl %0\n\tjns 2b"
		:"=&a" (d0)
		:"0" (loops));
}

void amd64_tweak(int rwt, int wrt, int ref, int en2t, int rct, int rrd, int rwqb, int wr)
{
	ulong dramtlr;
	ulong int1= 0x0;

	pci_conf_read(0, 24, 2, 0x88, 4, &dramtlr);

	// Row Cycle time
	int1 = dramtlr | 0xF0;
	if      (rct == 7 ) { dramtlr = int1 ^ 0xF0; }
	else if (rct == 8 ) { dramtlr = int1 ^ 0xE0; }
	else if (rct == 9 ) { dramtlr = int1 ^ 0xD0; }
	else if (rct == 10) { dramtlr = int1 ^ 0xC0; }
	else if (rct == 11) { dramtlr = int1 ^ 0xB0; }
	else if (rct == 12) { dramtlr = int1 ^ 0xA0; }
	else if (rct == 13) { dramtlr = int1 ^ 0x90; }
	else if (rct == 14) { dramtlr = int1 ^ 0x80; }
	else if (rct == 15) { dramtlr = int1 ^ 0x70; }
	else if (rct == 16) { dramtlr = int1 ^ 0x60; }
	else if (rct == 17) { dramtlr = int1 ^ 0x50; }
	else if (rct == 18) { dramtlr = int1 ^ 0x40; }
	else if (rct == 19) { dramtlr = int1 ^ 0x30; }
	else if (rct == 20) { dramtlr = int1 ^ 0x20; }
	// else		    { dramtlr = dramtlr;}

	//Active-avtive ras-ras delay
	int1 = dramtlr | 0x70000;
	if      (rrd == 2) { dramtlr = int1 ^ 0x50000; } // 2 bus clocks
	else if (rrd == 3) { dramtlr = int1 ^ 0x40000; } // 3 bus clocks
	else if (rrd == 4) { dramtlr = int1 ^ 0x30000; } // 4 bus clocks
	// else		   { dramtlr = dramtlr;}

	//Write recovery time
	int1 = dramtlr | 0x10000000;
	if      (wr == 2) { dramtlr = int1 ^ 0x10000000; } // 2 bus clocks
	else if (wr == 3) { dramtlr = int1 ^ 0x00000000; } // 3 bus clocks
	// else		  { dramtlr = dramtlr;}

	pci_conf_write(0, 24, 2, 0x88, 4, dramtlr);
	__delay(500);
	//////////////////////////////////////////////

	pci_conf_read(0, 24, 2, 0x8C, 4, &dramtlr);

	// Write-to read delay
	int1 = dramtlr | 0x1;
	if      (wrt == 2) { dramtlr = int1 ^ 0x0; }
	else if (wrt == 1) { dramtlr = int1 ^ 0x1; }
	// else		   { dramtlr = dramtlr;}

	// Read-to Write delay
	int1 = dramtlr | 0x70;
	if      (rwt == 1) { dramtlr = int1 ^ 0x70; }
	else if (rwt == 2) { dramtlr = int1 ^ 0x60; }
	else if (rwt == 3) { dramtlr = int1 ^ 0x50; }
	else if (rwt == 4) { dramtlr = int1 ^ 0x40; }
	else if (rwt == 5) { dramtlr = int1 ^ 0x30; }
	else if (rwt == 6) { dramtlr = int1 ^ 0x20; }
	// else		   { dramtlr = dramtlr;}

	//Refresh Rate
	int1 = dramtlr | 0x1800;
	if      (ref == 1) { dramtlr = int1 ^ 0x1800; } // 15.6us
	else if (ref == 2) { dramtlr = int1 ^ 0x1000; } // 7.8us
	else if (ref == 3) { dramtlr = int1 ^ 0x0800; } // 3.9us
	// else		   { dramtlr = dramtlr;}

	pci_conf_write(0, 24, 2, 0x8c, 4, dramtlr);
	__delay(500);
	/////////////////////////////////////

	pci_conf_read(0, 24, 2, 0x90, 4, &dramtlr);

	// Enable 2t command
	int1 = dramtlr | 0x10000000;
	if      (en2t == 2) { dramtlr = int1 ^ 0x00000000; } // 2T
	else if (en2t == 1) { dramtlr = int1 ^ 0x10000000; } // 1T
	// else		    { dramtlr = dramtlr;}

	// Read Write queue bypass count
	int1 = dramtlr | 0xC000;
	if      (rwqb == 2)  { dramtlr = int1 ^ 0xC000; }
	else if (rwqb == 4)  { dramtlr = int1 ^ 0x8000; }
	else if (rwqb == 8)  { dramtlr = int1 ^ 0x4000; }
	else if (rwqb == 16) { dramtlr = int1 ^ 0x0000; }
	// else		     { dramtlr = dramtlr;}

	pci_conf_write(0, 24, 2, 0x90, 4, dramtlr);
	__delay(500);
	restart();
}