[PATCH] PPC4xx: Add 440SP(e) DDR2 SPD DIMM support

This patch adds support for the DDR2 controller used on the
440SP and 440SPe. It is tested on the Katmai (440SPe) eval
board and works fine with the following DIMM modules:

- Corsair CM2X512-5400C4 (512MByte per DIMM)
- Kingston ValueRAM KVR667D2N5/512 (512MByte per DIMM)
- Kingston ValueRAM KVR667D2N5K2/2G (1GByte per DIMM)

This patch also adds the nice functionality to dynamically
create the TLB entries for the SDRAM (tlb.c). So we should
never run into such problems with wrong (too short) TLB
initialization again on these platforms.

Signed-off-by: Stefan Roese <sr@denx.de>

1 files changed, 2759 insertions, 0 deletions

diff --git a/cpu/ppc4xx/44x_spd_ddr2.c b/cpu/ppc4xx/44x_spd_ddr2.c
new file mode 100644
index 0000000..6cff3a2
--- /dev/null
+++ b/cpu/ppc4xx/44x_spd_ddr2.c
@@ -0,0 +1,2759 @@
+/*
+ * cpu/ppc4xx/44x_spd_ddr2.c
+ * This SPD SDRAM detection code supports AMCC PPC44x cpu's with a
+ * DDR2 controller (non Denali Core). Those are 440SP/SPe.
+ *
+ * (C) Copyright 2007
+ * Stefan Roese, DENX Software Engineering, sr@denx.de.
+ *
+ * COPYRIGHT   AMCC   CORPORATION 2004
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+/* define DEBUG for debugging output (obviously ;-)) */
+#if 0
+#define DEBUG
+#endif
+
+#include <common.h>
+#include <ppc4xx.h>
+#include <i2c.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/mmu.h>
+
+#if defined(CONFIG_SPD_EEPROM) &&				\
+	(defined(CONFIG_440SP) || defined(CONFIG_440SPE))
+
+#ifndef	TRUE
+#define TRUE            1
+#endif
+#ifndef FALSE
+#define FALSE           0
+#endif
+
+#define SDRAM_DDR1	1
+#define SDRAM_DDR2	2
+#define SDRAM_NONE	0
+
+#define MAXDIMMS 	2
+#define MAXRANKS 	4
+#define MAXBXCF		4
+#define MAX_SPD_BYTES	256   /* Max number of bytes on the DIMM's SPD EEPROM */
+
+#define ONE_BILLION	1000000000
+
+#define MULDIV64(m1, m2, d)	(u32)(((u64)(m1) * (u64)(m2)) / (u64)(d))
+
+#if defined(DEBUG)
+static void ppc440sp_sdram_register_dump(void);
+#endif
+
+/*-----------------------------------------------------------------------------+
+ * Defines
+ *-----------------------------------------------------------------------------*/
+/* Defines for the Read Cycle Delay test */
+#define NUMMEMTESTS 8
+#define NUMMEMWORDS 8
+
+/* Private Structure Definitions */
+
+/* enum only to ease code for cas latency setting */
+typedef enum ddr_cas_id {
+	DDR_CAS_2      = 20,
+	DDR_CAS_2_5    = 25,
+	DDR_CAS_3      = 30,
+	DDR_CAS_4      = 40,
+	DDR_CAS_5      = 50
+} ddr_cas_id_t;
+
+/*-----------------------------------------------------------------------------+
+ * Prototypes
+ *-----------------------------------------------------------------------------*/
+static unsigned long sdram_memsize(void);
+void program_tlb(u32 start, u32 size);
+static void get_spd_info(unsigned long *dimm_populated,
+			 unsigned char *iic0_dimm_addr,
+			 unsigned long num_dimm_banks);
+static void check_mem_type(unsigned long *dimm_populated,
+			   unsigned char *iic0_dimm_addr,
+			   unsigned long num_dimm_banks);
+static void check_frequency(unsigned long *dimm_populated,
+			    unsigned char *iic0_dimm_addr,
+			    unsigned long num_dimm_banks);
+static void check_rank_number(unsigned long *dimm_populated,
+			      unsigned char *iic0_dimm_addr,
+			      unsigned long num_dimm_banks);
+static void check_voltage_type(unsigned long *dimm_populated,
+			       unsigned char *iic0_dimm_addr,
+			       unsigned long num_dimm_banks);
+static void program_memory_queue(unsigned long *dimm_populated,
+				 unsigned char *iic0_dimm_addr,
+				 unsigned long num_dimm_banks);
+static void program_codt(unsigned long *dimm_populated,
+			 unsigned char *iic0_dimm_addr,
+			 unsigned long num_dimm_banks);
+static void program_mode(unsigned long *dimm_populated,
+			 unsigned char *iic0_dimm_addr,
+			 unsigned long num_dimm_banks,
+                         ddr_cas_id_t *selected_cas);
+static void program_tr(unsigned long *dimm_populated,
+		       unsigned char *iic0_dimm_addr,
+		       unsigned long num_dimm_banks);
+static void program_rtr(unsigned long *dimm_populated,
+			unsigned char *iic0_dimm_addr,
+			unsigned long num_dimm_banks);
+static void program_bxcf(unsigned long *dimm_populated,
+			 unsigned char *iic0_dimm_addr,
+			 unsigned long num_dimm_banks);
+static void program_copt1(unsigned long *dimm_populated,
+			  unsigned char *iic0_dimm_addr,
+			  unsigned long num_dimm_banks);
+static void program_initplr(unsigned long *dimm_populated,
+			    unsigned char *iic0_dimm_addr,
+			    unsigned long num_dimm_banks,
+                            ddr_cas_id_t selected_cas);
+static unsigned long is_ecc_enabled(void);
+static void program_ecc(unsigned long *dimm_populated,
+			unsigned char *iic0_dimm_addr,
+			unsigned long num_dimm_banks);
+static void program_ecc_addr(unsigned long start_address,
+			     unsigned long num_bytes);
+
+#ifdef HARD_CODED_DQS /* calibration test with hardvalues */
+static void          test(void);
+#else
+static void          DQS_calibration_process(void);
+#endif
+static void program_DQS_calibration(unsigned long *dimm_populated,
+				    unsigned char *iic0_dimm_addr,
+				    unsigned long num_dimm_banks);
+
+static u32 mfdcr_any(u32 dcr)
+{
+	u32 val;
+
+	switch (dcr) {
+	case SDRAM_R0BAS + 0:
+		val = mfdcr(SDRAM_R0BAS + 0);
+		break;
+	case SDRAM_R0BAS + 1:
+		val = mfdcr(SDRAM_R0BAS + 1);
+		break;
+	case SDRAM_R0BAS + 2:
+		val = mfdcr(SDRAM_R0BAS + 2);
+		break;
+	case SDRAM_R0BAS + 3:
+		val = mfdcr(SDRAM_R0BAS + 3);
+		break;
+	default:
+		printf("DCR %d not defined in case statement!!!\n", dcr);
+		val = 0; /* just to satisfy the compiler */
+	}
+
+	return val;
+}
+
+static void mtdcr_any(u32 dcr, u32 val)
+{
+	switch (dcr) {
+	case SDRAM_R0BAS + 0:
+		mtdcr(SDRAM_R0BAS + 0, val);
+		break;
+	case SDRAM_R0BAS + 1:
+		mtdcr(SDRAM_R0BAS + 1, val);
+		break;
+	case SDRAM_R0BAS + 2:
+		mtdcr(SDRAM_R0BAS + 2, val);
+		break;
+	case SDRAM_R0BAS + 3:
+		mtdcr(SDRAM_R0BAS + 3, val);
+		break;
+	default:
+		printf("DCR %d not defined in case statement!!!\n", dcr);
+	}
+}
+
+static void wait_ddr_idle(void)
+{
+	u32 val;
+
+	do {
+		mfsdram(SDRAM_MCSTAT, val);
+	} while ((val & SDRAM_MCSTAT_IDLE_MASK) == SDRAM_MCSTAT_IDLE_NOT);
+}
+
+static unsigned char spd_read(uchar chip, uint addr)
+{
+	unsigned char data[2];
+
+	if (i2c_probe(chip) == 0)
+		if (i2c_read(chip, addr, 1, data, 1) == 0)
+			return data[0];
+
+	return 0;
+}
+
+/*-----------------------------------------------------------------------------+
+ * sdram_memsize
+ *-----------------------------------------------------------------------------*/
+static unsigned long sdram_memsize(void)
+{
+	unsigned long mem_size;
+	unsigned long mcopt2;
+	unsigned long mcstat;
+	unsigned long mb0cf;
+	unsigned long sdsz;
+	unsigned long i;
+
+	mem_size = 0;
+
+	mfsdram(SDRAM_MCOPT2, mcopt2);
+	mfsdram(SDRAM_MCSTAT, mcstat);
+
+	/* DDR controller must be enabled and not in self-refresh. */
+	/* Otherwise memsize is zero. */
+	if (((mcopt2 & SDRAM_MCOPT2_DCEN_MASK) == SDRAM_MCOPT2_DCEN_ENABLE)
+	    && ((mcopt2 & SDRAM_MCOPT2_SREN_MASK) == SDRAM_MCOPT2_SREN_EXIT)
+	    && ((mcstat & (SDRAM_MCSTAT_MIC_MASK | SDRAM_MCSTAT_SRMS_MASK))
+		== (SDRAM_MCSTAT_MIC_COMP | SDRAM_MCSTAT_SRMS_NOT_SF))) {
+		for (i = 0; i < 4; i++) {
+			mfsdram(SDRAM_MB0CF + (i << 2), mb0cf);
+			/* Banks enabled */
+			if ((mb0cf & SDRAM_BXCF_M_BE_MASK) == SDRAM_BXCF_M_BE_ENABLE) {
+				sdsz = mfdcr_any(SDRAM_R0BAS + i) & SDRAM_RXBAS_SDSZ_MASK;
+
+				switch(sdsz) {
+				case SDRAM_RXBAS_SDSZ_8:
+					mem_size+=8;
+					break;
+				case SDRAM_RXBAS_SDSZ_16:
+					mem_size+=16;
+					break;
+				case SDRAM_RXBAS_SDSZ_32:
+					mem_size+=32;
+					break;
+				case SDRAM_RXBAS_SDSZ_64:
+					mem_size+=64;
+					break;
+				case SDRAM_RXBAS_SDSZ_128:
+					mem_size+=128;
+					break;
+				case SDRAM_RXBAS_SDSZ_256:
+					mem_size+=256;
+					break;
+				case SDRAM_RXBAS_SDSZ_512:
+					mem_size+=512;
+					break;
+				case SDRAM_RXBAS_SDSZ_1024:
+					mem_size+=1024;
+					break;
+				case SDRAM_RXBAS_SDSZ_2048:
+					mem_size+=2048;
+					break;
+				case SDRAM_RXBAS_SDSZ_4096:
+					mem_size+=4096;
+					break;
+				default:
+					mem_size=0;
+					break;
+				}
+			}
+		}
+	}
+
+	mem_size *= 1024 * 1024;
+	return(mem_size);
+}
+
+/*-----------------------------------------------------------------------------+
+ * initdram.  Initializes the 440SP Memory Queue and DDR SDRAM controller.
+ * Note: This routine runs from flash with a stack set up in the chip's
+ * sram space.  It is important that the routine does not require .sbss, .bss or
+ * .data sections.  It also cannot call routines that require these sections.
+ *-----------------------------------------------------------------------------*/
+/*-----------------------------------------------------------------------------
+ * Function:     initdram
+ * Description:  Configures SDRAM memory banks for DDR operation.
+ *               Auto Memory Configuration option reads the DDR SDRAM EEPROMs
+ *               via the IIC bus and then configures the DDR SDRAM memory
+ *               banks appropriately. If Auto Memory Configuration is
+ *               not used, it is assumed that no DIMM is plugged
+ *-----------------------------------------------------------------------------*/
+long int initdram(int board_type)
+{
+	unsigned char spd0[MAX_SPD_BYTES];
+	unsigned char spd1[MAX_SPD_BYTES];
+	unsigned char *dimm_spd[MAXDIMMS];
+	unsigned long dimm_populated[MAXDIMMS];
+	unsigned char iic0_dimm_addr[MAXDIMMS];
+	unsigned long num_dimm_banks;		    /* on board dimm banks */
+	unsigned long val;
+	ddr_cas_id_t  selected_cas;
+	unsigned long dram_size = 0;
+
+	num_dimm_banks = sizeof(iic0_dimm_addr);
+
+	/*------------------------------------------------------------------
+	 * Set up an array of SPD matrixes.
+	 *-----------------------------------------------------------------*/
+	dimm_spd[0] = spd0;
+	dimm_spd[1] = spd1;
+
+	/*------------------------------------------------------------------
+	 * Set up an array of iic0 dimm addresses.
+	 *-----------------------------------------------------------------*/
+	iic0_dimm_addr[0] = IIC0_DIMM0_ADDR;
+	iic0_dimm_addr[1] = IIC0_DIMM1_ADDR;
+
+	/*------------------------------------------------------------------
+	 * Reset the DDR-SDRAM controller.
+	 *-----------------------------------------------------------------*/
+	mtsdr(SDR0_SRST, 0x00200000);
+	mtsdr(SDR0_SRST, 0x00000000);
+
+	/*
+	 * Make sure I2C controller is initialized
+	 * before continuing.
+	 */
+
+	/* switch to correct I2C bus */
+	I2C_SET_BUS(CFG_SPD_BUS_NUM);
+	i2c_init(CFG_I2C_SPEED, CFG_I2C_SLAVE);
+
+	/*------------------------------------------------------------------
+	 * Clear out the serial presence detect buffers.
+	 * Perform IIC reads from the dimm.  Fill in the spds.
+	 * Check to see if the dimm slots are populated
+	 *-----------------------------------------------------------------*/
+	get_spd_info(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Check the memory type for the dimms plugged.
+	 *-----------------------------------------------------------------*/
+	check_mem_type(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Check the frequency supported for the dimms plugged.
+	 *-----------------------------------------------------------------*/
+	check_frequency(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Check the total rank number.
+	 *-----------------------------------------------------------------*/
+	check_rank_number(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Check the voltage type for the dimms plugged.
+	 *-----------------------------------------------------------------*/
+	check_voltage_type(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Program SDRAM controller options 2 register
+	 * Except Enabling of the memory controller.
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_MCOPT2, val);
+	mtsdram(SDRAM_MCOPT2,
+		(val &
+		 ~(SDRAM_MCOPT2_SREN_MASK | SDRAM_MCOPT2_PMEN_MASK |
+		   SDRAM_MCOPT2_IPTR_MASK | SDRAM_MCOPT2_XSRP_MASK |
+		   SDRAM_MCOPT2_ISIE_MASK))
+		| (SDRAM_MCOPT2_SREN_ENTER | SDRAM_MCOPT2_PMEN_DISABLE |
+		   SDRAM_MCOPT2_IPTR_IDLE | SDRAM_MCOPT2_XSRP_ALLOW |
+		   SDRAM_MCOPT2_ISIE_ENABLE));
+
+	/*------------------------------------------------------------------
+	 * Program SDRAM controller options 1 register
+	 * Note: Does not enable the memory controller.
+	 *-----------------------------------------------------------------*/
+	program_copt1(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Set the SDRAM Controller On Die Termination Register
+	 *-----------------------------------------------------------------*/
+	program_codt(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Program SDRAM refresh register.
+	 *-----------------------------------------------------------------*/
+	program_rtr(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Program SDRAM mode register.
+	 *-----------------------------------------------------------------*/
+	program_mode(dimm_populated, iic0_dimm_addr, num_dimm_banks, &selected_cas);
+
+	/*------------------------------------------------------------------
+	 * Set the SDRAM Write Data/DM/DQS Clock Timing Reg
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_WRDTR, val);
+	mtsdram(SDRAM_WRDTR, (val & ~(SDRAM_WRDTR_LLWP_MASK | SDRAM_WRDTR_WTR_MASK)) |
+		(SDRAM_WRDTR_LLWP_1_CYC | SDRAM_WRDTR_WTR_90_DEG_ADV));
+
+	/*------------------------------------------------------------------
+	 * Set the SDRAM Clock Timing Register
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_CLKTR, val);
+	mtsdram(SDRAM_CLKTR, (val & ~SDRAM_CLKTR_CLKP_MASK) | SDRAM_CLKTR_CLKP_0_DEG);
+
+	/*------------------------------------------------------------------
+	 * Program the BxCF registers.
+	 *-----------------------------------------------------------------*/
+	program_bxcf(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Program SDRAM timing registers.
+	 *-----------------------------------------------------------------*/
+	program_tr(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Set the Extended Mode register
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_MEMODE, val);
+	mtsdram(SDRAM_MEMODE,
+		(val & ~(SDRAM_MEMODE_DIC_MASK  | SDRAM_MEMODE_DLL_MASK |
+			 SDRAM_MEMODE_RTT_MASK | SDRAM_MEMODE_DQS_MASK)) |
+		(SDRAM_MEMODE_DIC_NORMAL | SDRAM_MEMODE_DLL_ENABLE
+		 | SDRAM_MEMODE_RTT_75OHM | SDRAM_MEMODE_DQS_ENABLE));
+
+	/*------------------------------------------------------------------
+	 * Program Initialization preload registers.
+	 *-----------------------------------------------------------------*/
+	program_initplr(dimm_populated, iic0_dimm_addr, num_dimm_banks,
+			selected_cas);
+
+	/*------------------------------------------------------------------
+	 * Delay to ensure 200usec have elapsed since reset.
+	 *-----------------------------------------------------------------*/
+	udelay(400);
+
+	/*------------------------------------------------------------------
+	 * Set the memory queue core base addr.
+	 *-----------------------------------------------------------------*/
+	program_memory_queue(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Program SDRAM controller options 2 register
+	 * Enable the memory controller.
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_MCOPT2, val);
+	mtsdram(SDRAM_MCOPT2,
+		(val & ~(SDRAM_MCOPT2_SREN_MASK | SDRAM_MCOPT2_DCEN_MASK |
+			 SDRAM_MCOPT2_IPTR_MASK | SDRAM_MCOPT2_ISIE_MASK)) |
+		(SDRAM_MCOPT2_DCEN_ENABLE | SDRAM_MCOPT2_IPTR_EXECUTE));
+
+	/*------------------------------------------------------------------
+	 * Wait for SDRAM_CFG0_DC_EN to complete.
+	 *-----------------------------------------------------------------*/
+	do {
+		mfsdram(SDRAM_MCSTAT, val);
+	} while ((val & SDRAM_MCSTAT_MIC_MASK) == SDRAM_MCSTAT_MIC_NOTCOMP);
+
+	/* get installed memory size */
+	dram_size = sdram_memsize();
+
+	/* and program tlb entries for this size (dynamic) */
+	program_tlb(0, dram_size);
+
+#if 1 /* TODO: ECC support will come later */
+	/*------------------------------------------------------------------
+	 * If ecc is enabled, initialize the parity bits.
+	 *-----------------------------------------------------------------*/
+	program_ecc(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+#endif
+
+	/*------------------------------------------------------------------
+	 * DQS calibration.
+	 *-----------------------------------------------------------------*/
+	program_DQS_calibration(dimm_populated, iic0_dimm_addr, num_dimm_banks);
+
+#ifdef DEBUG
+	ppc440sp_sdram_register_dump();
+#endif
+
+	return dram_size;
+}
+
+static void get_spd_info(unsigned long *dimm_populated,
+			 unsigned char *iic0_dimm_addr,
+			 unsigned long num_dimm_banks)
+{
+	unsigned long dimm_num;
+	unsigned long dimm_found;
+	unsigned char num_of_bytes;
+	unsigned char total_size;
+
+	dimm_found = FALSE;
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		num_of_bytes = 0;
+		total_size = 0;
+
+		num_of_bytes = spd_read(iic0_dimm_addr[dimm_num], 0);
+		debug("\nspd_read(0x%x) returned %d\n",
+		      iic0_dimm_addr[dimm_num], num_of_bytes);
+		total_size = spd_read(iic0_dimm_addr[dimm_num], 1);
+		debug("spd_read(0x%x) returned %d\n",
+		      iic0_dimm_addr[dimm_num], total_size);
+
+		if ((num_of_bytes != 0) && (total_size != 0)) {
+			dimm_populated[dimm_num] = TRUE;
+			dimm_found = TRUE;
+			debug("DIMM slot %lu: populated\n", dimm_num);
+		} else {
+			dimm_populated[dimm_num] = FALSE;
+			debug("DIMM slot %lu: Not populated\n", dimm_num);
+		}
+	}
+
+	if (dimm_found == FALSE) {
+		printf("ERROR - No memory installed. Install a DDR-SDRAM DIMM.\n\n");
+		hang();
+	}
+}
+
+#ifdef CONFIG_ADD_RAM_INFO
+void board_add_ram_info(int use_default)
+{
+        if (is_ecc_enabled())
+                puts(" (ECC enabled)");
+        else
+                puts(" (ECC not enabled)");
+}
+#endif
+
+/*------------------------------------------------------------------
+ * For the memory DIMMs installed, this routine verifies that they
+ * really are DDR specific DIMMs.
+ *-----------------------------------------------------------------*/
+static void check_mem_type(unsigned long *dimm_populated,
+			   unsigned char *iic0_dimm_addr,
+			   unsigned long num_dimm_banks)
+{
+	unsigned long dimm_num;
+	unsigned long dimm_type;
+
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		if (dimm_populated[dimm_num] == TRUE) {
+			dimm_type = spd_read(iic0_dimm_addr[dimm_num], 2);
+			switch (dimm_type) {
+			case 1:
+				printf("ERROR: Standard Fast Page Mode DRAM DIMM detected in "
+				       "slot %d.\n", (unsigned int)dimm_num);
+				printf("Only DDR and DDR2 SDRAM DIMMs are supported.\n");
+				printf("Replace the DIMM module with a supported DIMM.\n\n");
+				hang();
+				break;
+			case 2:
+				printf("ERROR: EDO DIMM detected in slot %d.\n",
+				       (unsigned int)dimm_num);
+				printf("Only DDR and DDR2 SDRAM DIMMs are supported.\n");
+				printf("Replace the DIMM module with a supported DIMM.\n\n");
+				hang();
+				break;
+			case 3:
+				printf("ERROR: Pipelined Nibble DIMM detected in slot %d.\n",
+				       (unsigned int)dimm_num);
+				printf("Only DDR and DDR2 SDRAM DIMMs are supported.\n");
+				printf("Replace the DIMM module with a supported DIMM.\n\n");
+				hang();
+				break;
+			case 4:
+				printf("ERROR: SDRAM DIMM detected in slot %d.\n",
+				       (unsigned int)dimm_num);
+				printf("Only DDR and DDR2 SDRAM DIMMs are supported.\n");
+				printf("Replace the DIMM module with a supported DIMM.\n\n");
+				hang();
+				break;
+			case 5:
+				printf("ERROR: Multiplexed ROM DIMM detected in slot %d.\n",
+				       (unsigned int)dimm_num);
+				printf("Only DDR and DDR2 SDRAM DIMMs are supported.\n");
+				printf("Replace the DIMM module with a supported DIMM.\n\n");
+				hang();
+				break;
+			case 6:
+				printf("ERROR: SGRAM DIMM detected in slot %d.\n",
+				       (unsigned int)dimm_num);
+				printf("Only DDR and DDR2 SDRAM DIMMs are supported.\n");
+				printf("Replace the DIMM module with a supported DIMM.\n\n");
+				hang();
+				break;
+			case 7:
+				debug("DIMM slot %d: DDR1 SDRAM detected\n", dimm_num);
+				dimm_populated[dimm_num] = SDRAM_DDR1;
+				break;
+			case 8:
+				debug("DIMM slot %d: DDR2 SDRAM detected\n", dimm_num);
+				dimm_populated[dimm_num] = SDRAM_DDR2;
+				break;
+			default:
+				printf("ERROR: Unknown DIMM detected in slot %d.\n",
+				       (unsigned int)dimm_num);
+				printf("Only DDR1 and DDR2 SDRAM DIMMs are supported.\n");
+				printf("Replace the DIMM module with a supported DIMM.\n\n");
+				hang();
+				break;
+			}
+		}
+	}
+	for (dimm_num = 1; dimm_num < num_dimm_banks; dimm_num++) {
+		if ((dimm_populated[dimm_num-1] != SDRAM_NONE)
+		    && (dimm_populated[dimm_num]   != SDRAM_NONE)
+		    && (dimm_populated[dimm_num-1] != dimm_populated[dimm_num])) {
+			printf("ERROR: DIMM's DDR1 and DDR2 type can not be mixed.\n");
+			hang();
+		}
+	}
+}
+
+/*------------------------------------------------------------------
+ * For the memory DIMMs installed, this routine verifies that
+ * frequency previously calculated is supported.
+ *-----------------------------------------------------------------*/
+static void check_frequency(unsigned long *dimm_populated,
+			    unsigned char *iic0_dimm_addr,
+			    unsigned long num_dimm_banks)
+{
+	unsigned long dimm_num;
+	unsigned long tcyc_reg;
+	unsigned long cycle_time;
+	unsigned long calc_cycle_time;
+	unsigned long sdram_freq;
+	unsigned long sdr_ddrpll;
+	PPC440_SYS_INFO board_cfg;
+
+	/*------------------------------------------------------------------
+	 * Get the board configuration info.
+	 *-----------------------------------------------------------------*/
+	get_sys_info(&board_cfg);
+
+	mfsdr(sdr_ddr0, sdr_ddrpll);
+	sdram_freq = ((board_cfg.freqPLB) * SDR0_DDR0_DDRM_DECODE(sdr_ddrpll));
+
+	/*
+	 * calc_cycle_time is calculated from DDR frequency set by board/chip
+	 * and is expressed in multiple of 10 picoseconds
+	 * to match the way DIMM cycle time is calculated below.
+	 */
+	calc_cycle_time = MULDIV64(ONE_BILLION, 100, sdram_freq);
+
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		if (dimm_populated[dimm_num] != SDRAM_NONE) {
+			tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 9);
+			/*
+			 * Byte 9, Cycle time for CAS Latency=X, is split into two nibbles:
+			 * the higher order nibble (bits 4-7) designates the cycle time
+			 * to a granularity of 1ns;
+			 * the value presented by the lower order nibble (bits 0-3)
+			 * has a granularity of .1ns and is added to the value designated
+			 * by the higher nibble. In addition, four lines of the lower order
+			 * nibble are assigned to support +.25,+.33, +.66 and +.75.
+			 */
+			 /* Convert from hex to decimal */
+			if ((tcyc_reg & 0x0F) == 0x0D)
+				cycle_time = (((tcyc_reg & 0xF0) >> 4) * 100) + 75;
+			else if ((tcyc_reg & 0x0F) == 0x0C)
+				cycle_time = (((tcyc_reg & 0xF0) >> 4) * 100) + 66;
+			else if ((tcyc_reg & 0x0F) == 0x0B)
+				cycle_time = (((tcyc_reg & 0xF0) >> 4) * 100) + 33;
+			else if ((tcyc_reg & 0x0F) == 0x0A)
+				cycle_time = (((tcyc_reg & 0xF0) >> 4) * 100) + 25;
+			else
+				cycle_time = (((tcyc_reg & 0xF0) >> 4) * 100) +
+					((tcyc_reg & 0x0F)*10);
+
+			if  (cycle_time > (calc_cycle_time + 10)) {
+				/*
+				 * the provided sdram cycle_time is too small
+				 * for the available DIMM cycle_time.
+				 * The additionnal 100ps is here to accept a small incertainty.
+				 */
+				printf("ERROR: DRAM DIMM detected with cycle_time %d ps in "
+				       "slot %d \n while calculated cycle time is %d ps.\n",
+				       (unsigned int)(cycle_time*10),
+				       (unsigned int)dimm_num,
+				       (unsigned int)(calc_cycle_time*10));
+				printf("Replace the DIMM, or change DDR frequency via "
+				       "strapping bits.\n\n");
+				hang();
+			}
+		}
+	}
+}
+
+/*------------------------------------------------------------------
+ * For the memory DIMMs installed, this routine verifies two
+ * ranks/banks maximum are availables.
+ *-----------------------------------------------------------------*/
+static void check_rank_number(unsigned long *dimm_populated,
+			      unsigned char *iic0_dimm_addr,
+			      unsigned long num_dimm_banks)
+{
+	unsigned long dimm_num;
+	unsigned long dimm_rank;
+	unsigned long total_rank = 0;
+
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		if (dimm_populated[dimm_num] != SDRAM_NONE) {
+			dimm_rank = spd_read(iic0_dimm_addr[dimm_num], 5);
+			if (((unsigned long)spd_read(iic0_dimm_addr[dimm_num], 2)) == 0x08)
+				dimm_rank = (dimm_rank & 0x0F) +1;
+			else
+				dimm_rank = dimm_rank & 0x0F;
+
+
+			if (dimm_rank > MAXRANKS) {
+				printf("ERROR: DRAM DIMM detected with %d ranks in "
+				       "slot %d is not supported.\n", dimm_rank, dimm_num);
+				printf("Only %d ranks are supported for all DIMM.\n", MAXRANKS);
+				printf("Replace the DIMM module with a supported DIMM.\n\n");
+				hang();
+			} else
+				total_rank += dimm_rank;
+		}
+		if (total_rank > MAXRANKS) {
+			printf("ERROR: DRAM DIMM detected with a total of %d ranks "
+			       "for all slots.\n", (unsigned int)total_rank);
+			printf("Only %d ranks are supported for all DIMM.\n", MAXRANKS);
+			printf("Remove one of the DIMM modules.\n\n");
+			hang();
+		}
+	}
+}
+
+/*------------------------------------------------------------------
+ * only support 2.5V modules.
+ * This routine verifies this.
+ *-----------------------------------------------------------------*/
+static void check_voltage_type(unsigned long *dimm_populated,
+			       unsigned char *iic0_dimm_addr,
+			       unsigned long num_dimm_banks)
+{
+	unsigned long dimm_num;
+	unsigned long voltage_type;
+
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		if (dimm_populated[dimm_num] != SDRAM_NONE) {
+			voltage_type = spd_read(iic0_dimm_addr[dimm_num], 8);
+			switch (voltage_type) {
+			case 0x00:
+				printf("ERROR: Only DIMMs DDR 2.5V or DDR2 1.8V are supported.\n");
+				printf("This DIMM is 5.0 Volt/TTL.\n");
+				printf("Replace the DIMM module in slot %d with a supported DIMM.\n\n",
+				       (unsigned int)dimm_num);
+				hang();
+				break;
+			case 0x01:
+				printf("ERROR: Only DIMMs DDR 2.5V or DDR2 1.8V are supported.\n");
+				printf("This DIMM is LVTTL.\n");
+				printf("Replace the DIMM module in slot %d with a supported DIMM.\n\n",
+				       (unsigned int)dimm_num);
+				hang();
+				break;
+			case 0x02:
+				printf("ERROR: Only DIMMs DDR 2.5V or DDR2 1.8V are supported.\n");
+				printf("This DIMM is 1.5 Volt.\n");
+				printf("Replace the DIMM module in slot %d with a supported DIMM.\n\n",
+				       (unsigned int)dimm_num);
+				hang();
+				break;
+			case 0x03:
+				printf("ERROR: Only DIMMs DDR 2.5V or DDR2 1.8V are supported.\n");
+				printf("This DIMM is 3.3 Volt/TTL.\n");
+				printf("Replace the DIMM module in slot %d with a supported DIMM.\n\n",
+				       (unsigned int)dimm_num);
+				hang();
+				break;
+			case 0x04:
+				/* 2.5 Voltage only for DDR1 */
+				break;
+			case 0x05:
+				/* 1.8 Voltage only for DDR2 */
+				break;
+			default:
+				printf("ERROR: Only DIMMs DDR 2.5V or DDR2 1.8V are supported.\n");
+				printf("Replace the DIMM module in slot %d with a supported DIMM.\n\n",
+				       (unsigned int)dimm_num);
+				hang();
+				break;
+			}
+		}
+	}
+}
+
+/*-----------------------------------------------------------------------------+
+ * program_copt1.
+ *-----------------------------------------------------------------------------*/
+static void program_copt1(unsigned long *dimm_populated,
+			  unsigned char *iic0_dimm_addr,
+			  unsigned long num_dimm_banks)
+{
+	unsigned long dimm_num;
+	unsigned long mcopt1;
+	unsigned long ecc_enabled;
+	unsigned long ecc = 0;
+	unsigned long data_width = 0;
+	unsigned long dimm_32bit;
+	unsigned long dimm_64bit;
+	unsigned long registered = 0;
+	unsigned long attribute = 0;
+	unsigned long buf0, buf1; /* TODO: code to be changed for IOP1.6 to support 4 DIMMs */
+	unsigned long bankcount;
+	unsigned long ddrtype;
+	unsigned long val;
+
+	ecc_enabled = TRUE;
+	dimm_32bit = FALSE;
+	dimm_64bit = FALSE;
+	buf0 = FALSE;
+	buf1 = FALSE;
+
+	/*------------------------------------------------------------------
+	 * Set memory controller options reg 1, SDRAM_MCOPT1.
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_MCOPT1, val);
+	mcopt1 = val & ~(SDRAM_MCOPT1_MCHK_MASK | SDRAM_MCOPT1_RDEN_MASK |
+			 SDRAM_MCOPT1_PMU_MASK  | SDRAM_MCOPT1_DMWD_MASK |
+			 SDRAM_MCOPT1_UIOS_MASK | SDRAM_MCOPT1_BCNT_MASK |
+			 SDRAM_MCOPT1_DDR_TYPE_MASK | SDRAM_MCOPT1_RWOO_MASK |
+			 SDRAM_MCOPT1_WOOO_MASK | SDRAM_MCOPT1_DCOO_MASK |
+			 SDRAM_MCOPT1_DREF_MASK);
+
+	mcopt1 |= SDRAM_MCOPT1_QDEP;
+	mcopt1 |= SDRAM_MCOPT1_PMU_OPEN;
+	mcopt1 |= SDRAM_MCOPT1_RWOO_DISABLED;
+	mcopt1 |= SDRAM_MCOPT1_WOOO_DISABLED;
+	mcopt1 |= SDRAM_MCOPT1_DCOO_DISABLED;
+	mcopt1 |= SDRAM_MCOPT1_DREF_NORMAL;
+
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		if (dimm_populated[dimm_num] != SDRAM_NONE) {
+			/* test ecc support */
+			ecc = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 11);
+			if (ecc != 0x02) /* ecc not supported */
+				ecc_enabled = FALSE;
+
+			/* test bank count */
+			bankcount = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 17);
+			if (bankcount == 0x04) /* bank count = 4 */
+				mcopt1 |= SDRAM_MCOPT1_4_BANKS;
+			else /* bank count = 8 */
+				mcopt1 |= SDRAM_MCOPT1_8_BANKS;
+
+			/* test DDR type */
+			ddrtype = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 2);
+			/* test for buffered/unbuffered, registered, differential clocks */
+			registered = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 20);
+			attribute = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 21);
+
+			/* TODO: code to be changed for IOP1.6 to support 4 DIMMs */
+			if (dimm_num == 0) {
+				if (dimm_populated[dimm_num] == SDRAM_DDR1) /* DDR1 type */
+					mcopt1 |= SDRAM_MCOPT1_DDR1_TYPE;
+				if (dimm_populated[dimm_num] == SDRAM_DDR2) /* DDR2 type */
+					mcopt1 |= SDRAM_MCOPT1_DDR2_TYPE;
+				if (registered == 1) { /* DDR2 always buffered */
+					/* TODO: what about above  comments ? */
+					mcopt1 |= SDRAM_MCOPT1_RDEN;
+					buf0 = TRUE;
+				} else {
+					/* TODO: the mask 0x02 doesn't match Samsung def for byte 21. */
+					if ((attribute & 0x02) == 0x00) {
+						/* buffered not supported */
+						buf0 = FALSE;
+					} else {
+						mcopt1 |= SDRAM_MCOPT1_RDEN;
+						buf0 = TRUE;
+					}
+				}
+			}
+			else if (dimm_num == 1) {
+				if (dimm_populated[dimm_num] == SDRAM_DDR1) /* DDR1 type */
+					mcopt1 |= SDRAM_MCOPT1_DDR1_TYPE;
+				if (dimm_populated[dimm_num] == SDRAM_DDR2) /* DDR2 type */
+					mcopt1 |= SDRAM_MCOPT1_DDR2_TYPE;
+				if (registered == 1) {
+					/* DDR2 always buffered */
+					mcopt1 |= SDRAM_MCOPT1_RDEN;
+					buf1 = TRUE;
+				} else {
+					if ((attribute & 0x02) == 0x00) {
+						/* buffered not supported */
+						buf1 = FALSE;
+					} else {
+						mcopt1 |= SDRAM_MCOPT1_RDEN;
+						buf1 = TRUE;
+					}
+				}
+			}
+
+			/* Note that for DDR2 the byte 7 is reserved, but OK to keep code as is. */
+			data_width = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 6) +
+				(((unsigned long)spd_read(iic0_dimm_addr[dimm_num], 7)) << 8);
+
+			switch (data_width) {
+			case 72:
+			case 64:
+				dimm_64bit = TRUE;
+				break;
+			case 40:
+			case 32:
+				dimm_32bit = TRUE;
+				break;
+			default:
+				printf("WARNING: Detected a DIMM with a data width of %d bits.\n",
+				       data_width);
+				printf("Only DIMMs with 32 or 64 bit DDR-SDRAM widths are supported.\n");
+				break;
+			}
+		}
+	}
+
+	/* verify matching properties */
+	if ((dimm_populated[0] != SDRAM_NONE) && (dimm_populated[1] != SDRAM_NONE)) {
+		if (buf0 != buf1) {
+			printf("ERROR: DIMM's buffered/unbuffered, registered, clocking don't match.\n");
+			hang();
+		}
+	}
+
+	if ((dimm_64bit == TRUE) && (dimm_32bit == TRUE)) {
+		printf("ERROR: Cannot mix 32 bit and 64 bit DDR-SDRAM DIMMs together.\n");
+		hang();
+	}
+	else if ((dimm_64bit == TRUE) && (dimm_32bit == FALSE)) {
+		mcopt1 |= SDRAM_MCOPT1_DMWD_64;
+	} else if ((dimm_64bit == FALSE) && (dimm_32bit == TRUE)) {
+		mcopt1 |= SDRAM_MCOPT1_DMWD_32;
+	} else {
+		printf("ERROR: Please install only 32 or 64 bit DDR-SDRAM DIMMs.\n\n");
+		hang();
+	}
+
+	if (ecc_enabled == TRUE)
+		mcopt1 |= SDRAM_MCOPT1_MCHK_GEN;
+	else
+		mcopt1 |= SDRAM_MCOPT1_MCHK_NON;
+
+	mtsdram(SDRAM_MCOPT1, mcopt1);
+}
+
+/*-----------------------------------------------------------------------------+
+ * program_codt.
+ *-----------------------------------------------------------------------------*/
+static void program_codt(unsigned long *dimm_populated,
+			 unsigned char *iic0_dimm_addr,
+			 unsigned long num_dimm_banks)
+{
+	unsigned long codt;
+	unsigned long modt0 = 0;
+	unsigned long modt1 = 0;
+	unsigned long modt2 = 0;
+	unsigned long modt3 = 0;
+	unsigned char dimm_num;
+	unsigned char dimm_rank;
+	unsigned char total_rank = 0;
+	unsigned char total_dimm = 0;
+	unsigned char dimm_type = 0;
+	unsigned char firstSlot = 0;
+
+	/*------------------------------------------------------------------
+	 * Set the SDRAM Controller On Die Termination Register
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_CODT, codt);
+	codt |= (SDRAM_CODT_IO_NMODE
+		 & (~SDRAM_CODT_DQS_SINGLE_END
+		    & ~SDRAM_CODT_CKSE_SINGLE_END
+		    & ~SDRAM_CODT_FEEBBACK_RCV_SINGLE_END
+		    & ~SDRAM_CODT_FEEBBACK_DRV_SINGLE_END));
+
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		if (dimm_populated[dimm_num] != SDRAM_NONE) {
+			dimm_rank = (unsigned long)spd_read(iic0_dimm_addr[dimm_num], 5);
+			if (((unsigned long)spd_read(iic0_dimm_addr[dimm_num], 2)) == 0x08) {
+				dimm_rank = (dimm_rank & 0x0F) + 1;
+				dimm_type = SDRAM_DDR2;
+			} else {
+				dimm_rank = dimm_rank & 0x0F;
+				dimm_type = SDRAM_DDR1;
+			}
+
+			total_rank +=  dimm_rank;
+			total_dimm ++;
+			if ((dimm_num == 0) && (total_dimm == 1))
+				firstSlot = TRUE;
+			else
+				firstSlot = FALSE;
+		}
+	}
+	if (dimm_type == SDRAM_DDR2) {
+		codt |= SDRAM_CODT_DQS_1_8_V_DDR2;
+		if ((total_dimm == 1) && (firstSlot == TRUE)) {
+			if (total_rank == 1) {
+				codt |= 0x00800000;
+				modt0 = 0x01000000;
+				modt1 = 0x00000000;
+				modt2 = 0x00000000;
+				modt3 = 0x00000000;
+			}
+			if (total_rank == 2) {
+				codt |= 0x02800000;
+				modt0 = 0x06000000;
+				modt1 = 0x01800000;
+				modt2 = 0x00000000;
+				modt3 = 0x00000000;
+			}
+		} else {
+			if (total_rank == 1) {
+				codt |= 0x00800000;
+				modt0 = 0x01000000;
+				modt1 = 0x00000000;
+				modt2 = 0x00000000;
+				modt3 = 0x00000000;
+			}
+			if (total_rank == 2) {
+				codt |= 0x02800000;
+				modt0 = 0x06000000;
+				modt1 = 0x01800000;
+				modt2 = 0x00000000;
+				modt3 = 0x00000000;
+			}
+		}
+		if (total_dimm == 2) {
+			if (total_rank == 2) {
+				codt |= 0x08800000;
+				modt0 = 0x18000000;
+				modt1 = 0x00000000;
+				modt2 = 0x01800000;
+				modt3 = 0x00000000;
+			}
+			if (total_rank == 4) {
+				codt |= 0x2a800000;
+				modt0 = 0x18000000;
+				modt1 = 0x18000000;
+				modt2 = 0x01800000;
+				modt3 = 0x01800000;
+			}
+		}
+  	} else {
+		codt |= SDRAM_CODT_DQS_2_5_V_DDR1;
+		modt0 = 0x00000000;
+		modt1 = 0x00000000;
+		modt2 = 0x00000000;
+		modt3 = 0x00000000;
+
+		if (total_dimm == 1) {
+			if (total_rank == 1)
+				codt |= 0x00800000;
+			if (total_rank == 2)
+				codt |= 0x02800000;
+		}
+		if (total_dimm == 2) {
+			if (total_rank == 2)
+				codt |= 0x08800000;
+			if (total_rank == 4)
+				codt |= 0x2a800000;
+		}
+	}
+
+	debug("nb of dimm %d\n", total_dimm);
+	debug("nb of rank %d\n", total_rank);
+	if (total_dimm == 1)
+		debug("dimm in slot %d\n", firstSlot);
+
+	mtsdram(SDRAM_CODT, codt);
+	mtsdram(SDRAM_MODT0, modt0);
+	mtsdram(SDRAM_MODT1, modt1);
+	mtsdram(SDRAM_MODT2, modt2);
+	mtsdram(SDRAM_MODT3, modt3);
+}
+
+/*-----------------------------------------------------------------------------+
+ * program_initplr.
+ *-----------------------------------------------------------------------------*/
+static void program_initplr(unsigned long *dimm_populated,
+			    unsigned char *iic0_dimm_addr,
+			    unsigned long num_dimm_banks,
+                            ddr_cas_id_t selected_cas)
+{
+	unsigned long MR_CAS_value = 0;
+
+	/******************************************************
+	 ** Assumption: if more than one DIMM, all DIMMs are the same
+	 **             as already checked in check_memory_type
+	 ******************************************************/
+
+	if ((dimm_populated[0] == SDRAM_DDR1) || (dimm_populated[1] == SDRAM_DDR1)) {
+		mtsdram(SDRAM_INITPLR0, 0x81B80000);
+		mtsdram(SDRAM_INITPLR1, 0x81900400);
+		mtsdram(SDRAM_INITPLR2, 0x81810000);
+		mtsdram(SDRAM_INITPLR3, 0xff800162);
+		mtsdram(SDRAM_INITPLR4, 0x81900400);
+		mtsdram(SDRAM_INITPLR5, 0x86080000);
+		mtsdram(SDRAM_INITPLR6, 0x86080000);
+		mtsdram(SDRAM_INITPLR7, 0x81000062);
+	} else if ((dimm_populated[0] == SDRAM_DDR2) || (dimm_populated[1] == SDRAM_DDR2)) {
+		switch (selected_cas) {
+			/*
+			 * The CAS latency is a field of the Mode Reg
+			 * that need to be set from caller input.
+			 * CAS bits in Mode Reg are starting at bit 4 at least for the Micron DDR2
+			 * this is the reason of the shift.
+			 */
+		case DDR_CAS_3:
+			MR_CAS_value = 3 << 4;
+			break;
+		case DDR_CAS_4:
+			MR_CAS_value = 4 << 4;
+			break;
+		case DDR_CAS_5:
+			MR_CAS_value = 5 << 4;
+			break;
+		default:
+			printf("ERROR: ucode error on selected_cas value %d", (unsigned char)selected_cas);
+			hang();
+			break;
+		}
+
+		mtsdram(SDRAM_INITPLR0,  0xB5380000);			/* NOP */
+		mtsdram(SDRAM_INITPLR1,  0x82100400);			/* precharge 8 DDR clock cycle */
+		mtsdram(SDRAM_INITPLR2,  0x80820000);			/* EMR2 */
+		mtsdram(SDRAM_INITPLR3,  0x80830000);			/* EMR3 */
+		mtsdram(SDRAM_INITPLR4,  0x80810000);			/* EMR DLL ENABLE */
+		mtsdram(SDRAM_INITPLR5,  0x80800502 | MR_CAS_value);	/* MR w/ DLL reset */
+		mtsdram(SDRAM_INITPLR6,  0x82100400);			/* precharge 8 DDR clock cycle */
+		mtsdram(SDRAM_INITPLR7,  0x8a080000);			/* Refresh  50 DDR clock cycle */
+		mtsdram(SDRAM_INITPLR8,  0x8a080000);			/* Refresh  50 DDR clock cycle */
+		mtsdram(SDRAM_INITPLR9,  0x8a080000);			/* Refresh  50 DDR clock cycle */
+		mtsdram(SDRAM_INITPLR10, 0x8a080000);			/* Refresh  50 DDR clock cycle */
+		mtsdram(SDRAM_INITPLR11, 0x80800402 | MR_CAS_value);	/* MR w/o DLL reset */
+		mtsdram(SDRAM_INITPLR12, 0x80810380);			/* EMR OCD Default */
+		mtsdram(SDRAM_INITPLR13, 0x80810000);			/* EMR OCD Exit */
+	} else {
+		printf("ERROR: ucode error as unknown DDR type in program_initplr");
+		hang();
+	}
+}
+
+/*------------------------------------------------------------------
+ * This routine programs the SDRAM_MMODE register.
+ * the selected_cas is an output parameter, that will be passed
+ * by caller to call the above program_initplr( )
+ *-----------------------------------------------------------------*/
+static void program_mode(unsigned long *dimm_populated,
+			 unsigned char *iic0_dimm_addr,
+			 unsigned long num_dimm_banks,
+			 ddr_cas_id_t *selected_cas)
+{
+	unsigned long dimm_num;
+	unsigned long sdram_ddr1;
+	unsigned long t_wr_ns;
+	unsigned long t_wr_clk;
+	unsigned long cas_bit;
+	unsigned long cas_index;
+	unsigned long sdram_freq;
+	unsigned long ddr_check;
+	unsigned long mmode;
+	unsigned long tcyc_reg;
+	unsigned long cycle_2_0_clk;
+	unsigned long cycle_2_5_clk;
+	unsigned long cycle_3_0_clk;
+	unsigned long cycle_4_0_clk;
+	unsigned long cycle_5_0_clk;
+	unsigned long max_2_0_tcyc_ns_x_100;
+	unsigned long max_2_5_tcyc_ns_x_100;
+	unsigned long max_3_0_tcyc_ns_x_100;
+	unsigned long max_4_0_tcyc_ns_x_100;
+	unsigned long max_5_0_tcyc_ns_x_100;
+	unsigned long cycle_time_ns_x_100[3];
+	PPC440_SYS_INFO board_cfg;
+	unsigned char cas_2_0_available;
+	unsigned char cas_2_5_available;
+	unsigned char cas_3_0_available;
+	unsigned char cas_4_0_available;
+	unsigned char cas_5_0_available;
+	unsigned long sdr_ddrpll;
+
+	/*------------------------------------------------------------------
+	 * Get the board configuration info.
+	 *-----------------------------------------------------------------*/
+	get_sys_info(&board_cfg);
+
+	mfsdr(sdr_ddr0, sdr_ddrpll);
+	sdram_freq = MULDIV64((board_cfg.freqPLB), SDR0_DDR0_DDRM_DECODE(sdr_ddrpll), 1);
+
+	/*------------------------------------------------------------------
+	 * Handle the timing.  We need to find the worst case timing of all
+	 * the dimm modules installed.
+	 *-----------------------------------------------------------------*/
+	t_wr_ns = 0;
+	cas_2_0_available = TRUE;
+	cas_2_5_available = TRUE;
+	cas_3_0_available = TRUE;
+	cas_4_0_available = TRUE;
+	cas_5_0_available = TRUE;
+	max_2_0_tcyc_ns_x_100 = 10;
+	max_2_5_tcyc_ns_x_100 = 10;
+	max_3_0_tcyc_ns_x_100 = 10;
+	max_4_0_tcyc_ns_x_100 = 10;
+	max_5_0_tcyc_ns_x_100 = 10;
+	sdram_ddr1 = TRUE;
+
+	/* loop through all the DIMM slots on the board */
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		/* If a dimm is installed in a particular slot ... */
+		if (dimm_populated[dimm_num] != SDRAM_NONE) {
+			if (dimm_populated[dimm_num] == SDRAM_DDR1)
+				sdram_ddr1 = TRUE;
+			else
+				sdram_ddr1 = FALSE;
+
+			/* t_wr_ns = max(t_wr_ns, (unsigned long)dimm_spd[dimm_num][36] >> 2); */ /*  not used in this loop. */
+			cas_bit = spd_read(iic0_dimm_addr[dimm_num], 18);
+
+			/* For a particular DIMM, grab the three CAS values it supports */
+			for (cas_index = 0; cas_index < 3; cas_index++) {
+				switch (cas_index) {
+				case 0:
+					tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 9);
+					break;
+				case 1:
+					tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 23);
+					break;
+				default:
+					tcyc_reg = spd_read(iic0_dimm_addr[dimm_num], 25);
+					break;
+				}
+
+				if ((tcyc_reg & 0x0F) >= 10) {
+					if ((tcyc_reg & 0x0F) == 0x0D) {
+						/* Convert from hex to decimal */
+						cycle_time_ns_x_100[cas_index] = (((tcyc_reg & 0xF0) >> 4) * 100) + 75;
+					} else {
+						printf("ERROR: SPD reported Tcyc is incorrect for DIMM "
+						       "in slot %d\n", (unsigned int)dimm_num);
+						hang();
+					}
+				} else {
+					/* Convert from hex to decimal */
+					cycle_time_ns_x_100[cas_index] = (((tcyc_reg & 0xF0) >> 4) * 100) +
+						((tcyc_reg & 0x0F)*10);
+				}
+			}
+
+			/* The rest of this routine determines if CAS 2.0, 2.5, 3.0, 4.0 and 5.0 are */
+			/* supported for a particular DIMM. */
+			cas_index = 0;
+
+			if (sdram_ddr1) {
+				/*
+				 * DDR devices use the following bitmask for CAS latency:
+				 *  Bit   7    6    5    4    3    2    1    0
+				 *       TBD  4.0  3.5  3.0  2.5  2.0  1.5  1.0
+				 */
+				if (((cas_bit & 0x40) == 0x40) && (cas_index < 3) && (cycle_time_ns_x_100[cas_index] != 0)) {
+					max_4_0_tcyc_ns_x_100 = max(max_4_0_tcyc_ns_x_100, cycle_time_ns_x_100[cas_index]);
+					cas_index++;
+				} else {
+					if (cas_index != 0)
+						cas_index++;
+					cas_4_0_available = FALSE;
+				}
+
+				if (((cas_bit & 0x10) == 0x10) && (cas_index < 3) && (cycle_time_ns_x_100[cas_index] != 0)) {
+					max_3_0_tcyc_ns_x_100 = max(max_3_0_tcyc_ns_x_100, cycle_time_ns_x_100[cas_index]);
+					cas_index++;
+				} else {
+					if (cas_index != 0)
+						cas_index++;
+					cas_3_0_available = FALSE;
+				}
+
+				if (((cas_bit & 0x08) == 0x08) && (cas_index < 3) && (cycle_time_ns_x_100[cas_index] != 0)) {
+					max_2_5_tcyc_ns_x_100 = max(max_2_5_tcyc_ns_x_100, cycle_time_ns_x_100[cas_index]);
+					cas_index++;
+				} else {
+					if (cas_index != 0)
+						cas_index++;
+					cas_2_5_available = FALSE;
+				}
+
+				if (((cas_bit & 0x04) == 0x04) && (cas_index < 3) && (cycle_time_ns_x_100[cas_index] != 0)) {
+					max_2_0_tcyc_ns_x_100 = max(max_2_0_tcyc_ns_x_100, cycle_time_ns_x_100[cas_index]);
+					cas_index++;
+				} else {
+					if (cas_index != 0)
+						cas_index++;
+					cas_2_0_available = FALSE;
+				}
+			} else {
+				/*
+				 * DDR2 devices use the following bitmask for CAS latency:
+				 *  Bit   7    6    5    4    3    2    1    0
+				 *       TBD  6.0  5.0  4.0  3.0  2.0  TBD  TBD
+				 */
+				if (((cas_bit & 0x20) == 0x20) && (cas_index < 3) && (cycle_time_ns_x_100[cas_index] != 0)) {
+					max_5_0_tcyc_ns_x_100 = max(max_5_0_tcyc_ns_x_100, cycle_time_ns_x_100[cas_index]);
+					cas_index++;
+				} else {
+					if (cas_index != 0)
+						cas_index++;
+					cas_5_0_available = FALSE;
+				}
+
+				if (((cas_bit & 0x10) == 0x10) && (cas_index < 3) && (cycle_time_ns_x_100[cas_index] != 0)) {
+					max_4_0_tcyc_ns_x_100 = max(max_4_0_tcyc_ns_x_100, cycle_time_ns_x_100[cas_index]);
+					cas_index++;
+				} else {
+					if (cas_index != 0)
+						cas_index++;
+					cas_4_0_available = FALSE;
+				}
+
+				if (((cas_bit & 0x08) == 0x08) && (cas_index < 3) && (cycle_time_ns_x_100[cas_index] != 0)) {
+					max_3_0_tcyc_ns_x_100 = max(max_3_0_tcyc_ns_x_100, cycle_time_ns_x_100[cas_index]);
+					cas_index++;
+				} else {
+					if (cas_index != 0)
+						cas_index++;
+					cas_3_0_available = FALSE;
+				}
+			}
+		}
+	}
+
+	/*------------------------------------------------------------------
+	 * Set the SDRAM mode, SDRAM_MMODE
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_MMODE, mmode);
+	mmode = mmode & ~(SDRAM_MMODE_WR_MASK | SDRAM_MMODE_DCL_MASK);
+
+	cycle_2_0_clk = MULDIV64(ONE_BILLION, 100, max_2_0_tcyc_ns_x_100);
+	cycle_2_5_clk = MULDIV64(ONE_BILLION, 100, max_2_5_tcyc_ns_x_100);
+	cycle_3_0_clk = MULDIV64(ONE_BILLION, 100, max_3_0_tcyc_ns_x_100);
+	cycle_4_0_clk = MULDIV64(ONE_BILLION, 100, max_4_0_tcyc_ns_x_100);
+	cycle_5_0_clk = MULDIV64(ONE_BILLION, 100, max_5_0_tcyc_ns_x_100);
+
+	if (sdram_ddr1 == TRUE) { /* DDR1 */
+		if ((cas_2_0_available == TRUE) && (sdram_freq <= cycle_2_0_clk)) {
+			mmode |= SDRAM_MMODE_DCL_DDR1_2_0_CLK;
+			*selected_cas = DDR_CAS_2;
+		} else if ((cas_2_5_available == TRUE) && (sdram_freq <= cycle_2_5_clk)) {
+			mmode |= SDRAM_MMODE_DCL_DDR1_2_5_CLK;
+			*selected_cas = DDR_CAS_2_5;
+		} else if ((cas_3_0_available == TRUE) && (sdram_freq <= cycle_3_0_clk)) {
+			mmode |= SDRAM_MMODE_DCL_DDR1_3_0_CLK;
+			*selected_cas = DDR_CAS_3;
+		} else {
+			printf("ERROR: Cannot find a supported CAS latency with the installed DIMMs.\n");
+			printf("Only DIMMs DDR1 with CAS latencies of 2.0, 2.5, and 3.0 are supported.\n");
+			printf("Make sure the PLB speed is within the supported range of the DIMMs.\n\n");
+			hang();
+		}
+	} else { /* DDR2 */
+		if ((cas_3_0_available == TRUE) && (sdram_freq <= cycle_3_0_clk)) {
+			mmode |= SDRAM_MMODE_DCL_DDR2_3_0_CLK;
+			*selected_cas = DDR_CAS_3;
+		} else if ((cas_4_0_available == TRUE) && (sdram_freq <= cycle_4_0_clk)) {
+			mmode |= SDRAM_MMODE_DCL_DDR2_4_0_CLK;
+			*selected_cas = DDR_CAS_4;
+		} else if ((cas_5_0_available == TRUE) && (sdram_freq <= cycle_5_0_clk)) {
+			mmode |= SDRAM_MMODE_DCL_DDR2_5_0_CLK;
+			*selected_cas = DDR_CAS_5;
+		} else {
+			printf("ERROR: Cannot find a supported CAS latency with the installed DIMMs.\n");
+			printf("Only DIMMs DDR2 with CAS latencies of 3.0, 4.0, and 5.0 are supported.\n");
+			printf("Make sure the PLB speed is within the supported range of the DIMMs.\n\n");
+			hang();
+		}
+	}
+
+	if (sdram_ddr1 == TRUE)
+		mmode |= SDRAM_MMODE_WR_DDR1;
+	else {
+
+		/* loop through all the DIMM slots on the board */
+		for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+			/* If a dimm is installed in a particular slot ... */
+			if (dimm_populated[dimm_num] != SDRAM_NONE)
+				t_wr_ns = max(t_wr_ns,
+					      spd_read(iic0_dimm_addr[dimm_num], 36) >> 2);
+		}
+
+		/*
+		 * convert from nanoseconds to ddr clocks
+		 * round up if necessary
+		 */
+		t_wr_clk = MULDIV64(sdram_freq, t_wr_ns, ONE_BILLION);
+		ddr_check = MULDIV64(ONE_BILLION, t_wr_clk, t_wr_ns);
+		if (sdram_freq != ddr_check)
+			t_wr_clk++;
+
+		switch (t_wr_clk) {
+		case 0:
+		case 1:
+		case 2:
+		case 3:
+			mmode |= SDRAM_MMODE_WR_DDR2_3_CYC;
+			break;
+		case 4:
+			mmode |= SDRAM_MMODE_WR_DDR2_4_CYC;
+			break;
+		case 5:
+			mmode |= SDRAM_MMODE_WR_DDR2_5_CYC;
+			break;
+		default:
+			mmode |= SDRAM_MMODE_WR_DDR2_6_CYC;
+			break;
+		}
+	}
+
+	mtsdram(SDRAM_MMODE, mmode);
+}
+
+/*-----------------------------------------------------------------------------+
+ * program_rtr.
+ *-----------------------------------------------------------------------------*/
+static void program_rtr(unsigned long *dimm_populated,
+			unsigned char *iic0_dimm_addr,
+			unsigned long num_dimm_banks)
+{
+	PPC440_SYS_INFO board_cfg;
+	unsigned long max_refresh_rate;
+	unsigned long dimm_num;
+	unsigned long refresh_rate_type;
+	unsigned long refresh_rate;
+	unsigned long rint;
+	unsigned long sdram_freq;
+	unsigned long sdr_ddrpll;
+	unsigned long val;
+
+	/*------------------------------------------------------------------
+	 * Get the board configuration info.
+	 *-----------------------------------------------------------------*/
+	get_sys_info(&board_cfg);
+
+	/*------------------------------------------------------------------
+	 * Set the SDRAM Refresh Timing Register, SDRAM_RTR
+	 *-----------------------------------------------------------------*/
+	mfsdr(sdr_ddr0, sdr_ddrpll);
+	sdram_freq = ((board_cfg.freqPLB) * SDR0_DDR0_DDRM_DECODE(sdr_ddrpll));
+
+	max_refresh_rate = 0;
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		if (dimm_populated[dimm_num] != SDRAM_NONE) {
+
+			refresh_rate_type = spd_read(iic0_dimm_addr[dimm_num], 12);
+			refresh_rate_type &= 0x7F;
+			switch (refresh_rate_type) {
+			case 0:
+				refresh_rate =  15625;
+				break;
+			case 1:
+				refresh_rate =   3906;
+				break;
+			case 2:
+				refresh_rate =   7812;
+				break;
+			case 3:
+				refresh_rate =  31250;
+				break;
+			case 4:
+				refresh_rate =  62500;
+				break;
+			case 5:
+				refresh_rate = 125000;
+				break;
+			default:
+				refresh_rate = 0;
+				printf("ERROR: DIMM %d unsupported refresh rate/type.\n",
+				       (unsigned int)dimm_num);
+				printf("Replace the DIMM module with a supported DIMM.\n\n");
+				hang();
+				break;
+			}
+
+			max_refresh_rate = max(max_refresh_rate, refresh_rate);
+		}
+	}
+
+	rint = MULDIV64(sdram_freq, max_refresh_rate, ONE_BILLION);
+	mfsdram(SDRAM_RTR, val);
+	mtsdram(SDRAM_RTR, (val & ~SDRAM_RTR_RINT_MASK) |
+		(SDRAM_RTR_RINT_ENCODE(rint)));
+}
+
+/*------------------------------------------------------------------
+ * This routine programs the SDRAM_TRx registers.
+ *-----------------------------------------------------------------*/
+static void program_tr(unsigned long *dimm_populated,
+		       unsigned char *iic0_dimm_addr,
+		       unsigned long num_dimm_banks)
+{
+	unsigned long dimm_num;
+	unsigned long sdram_ddr1;
+	unsigned long t_rp_ns;
+	unsigned long t_rcd_ns;
+	unsigned long t_rrd_ns;
+	unsigned long t_ras_ns;
+	unsigned long t_rc_ns;
+	unsigned long t_rfc_ns;
+	unsigned long t_wpc_ns;
+	unsigned long t_wtr_ns;
+	unsigned long t_rpc_ns;
+	unsigned long t_rp_clk;
+	unsigned long t_rcd_clk;
+	unsigned long t_rrd_clk;
+	unsigned long t_ras_clk;
+	unsigned long t_rc_clk;
+	unsigned long t_rfc_clk;
+	unsigned long t_wpc_clk;
+	unsigned long t_wtr_clk;
+	unsigned long t_rpc_clk;
+	unsigned long sdtr1, sdtr2, sdtr3;
+	unsigned long ddr_check;
+	unsigned long sdram_freq;
+	unsigned long sdr_ddrpll;
+
+	PPC440_SYS_INFO board_cfg;
+
+	/*------------------------------------------------------------------
+	 * Get the board configuration info.
+	 *-----------------------------------------------------------------*/
+	get_sys_info(&board_cfg);
+
+	mfsdr(sdr_ddr0, sdr_ddrpll);
+	sdram_freq = ((board_cfg.freqPLB) * SDR0_DDR0_DDRM_DECODE(sdr_ddrpll));
+
+	/*------------------------------------------------------------------
+	 * Handle the timing.  We need to find the worst case timing of all
+	 * the dimm modules installed.
+	 *-----------------------------------------------------------------*/
+	t_rp_ns = 0;
+	t_rrd_ns = 0;
+	t_rcd_ns = 0;
+	t_ras_ns = 0;
+	t_rc_ns = 0;
+	t_rfc_ns = 0;
+	t_wpc_ns = 0;
+	t_wtr_ns = 0;
+	t_rpc_ns = 0;
+	sdram_ddr1 = TRUE;
+
+	/* loop through all the DIMM slots on the board */
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		/* If a dimm is installed in a particular slot ... */
+		if (dimm_populated[dimm_num] != SDRAM_NONE) {
+			if (dimm_populated[dimm_num] == SDRAM_DDR2)
+				sdram_ddr1 = TRUE;
+			else
+				sdram_ddr1 = FALSE;
+
+			t_rcd_ns = max(t_rcd_ns, spd_read(iic0_dimm_addr[dimm_num], 29) >> 2);
+			t_rrd_ns = max(t_rrd_ns, spd_read(iic0_dimm_addr[dimm_num], 28) >> 2);
+			t_rp_ns  = max(t_rp_ns,  spd_read(iic0_dimm_addr[dimm_num], 27) >> 2);
+			t_ras_ns = max(t_ras_ns, spd_read(iic0_dimm_addr[dimm_num], 30));
+			t_rc_ns  = max(t_rc_ns,  spd_read(iic0_dimm_addr[dimm_num], 41));
+			t_rfc_ns = max(t_rfc_ns, spd_read(iic0_dimm_addr[dimm_num], 42));
+		}
+	}
+
+	/*------------------------------------------------------------------
+	 * Set the SDRAM Timing Reg 1, SDRAM_TR1
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_SDTR1, sdtr1);
+	sdtr1 &= ~(SDRAM_SDTR1_LDOF_MASK | SDRAM_SDTR1_RTW_MASK |
+		   SDRAM_SDTR1_WTWO_MASK | SDRAM_SDTR1_RTRO_MASK);
+
+	/* default values */
+	sdtr1 |= SDRAM_SDTR1_LDOF_2_CLK;
+	sdtr1 |= SDRAM_SDTR1_RTW_2_CLK;
+
+	/* normal operations */
+	sdtr1 |= SDRAM_SDTR1_WTWO_0_CLK;
+	sdtr1 |= SDRAM_SDTR1_RTRO_1_CLK;
+
+	mtsdram(SDRAM_SDTR1, sdtr1);
+
+	/*------------------------------------------------------------------
+	 * Set the SDRAM Timing Reg 2, SDRAM_TR2
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_SDTR2, sdtr2);
+	sdtr2 &= ~(SDRAM_SDTR2_RCD_MASK  | SDRAM_SDTR2_WTR_MASK |
+		   SDRAM_SDTR2_XSNR_MASK | SDRAM_SDTR2_WPC_MASK |
+		   SDRAM_SDTR2_RPC_MASK  | SDRAM_SDTR2_RP_MASK  |
+		   SDRAM_SDTR2_RRD_MASK);
+
+	/*
+	 * convert t_rcd from nanoseconds to ddr clocks
+	 * round up if necessary
+	 */
+	t_rcd_clk = MULDIV64(sdram_freq, t_rcd_ns, ONE_BILLION);
+	ddr_check = MULDIV64(ONE_BILLION, t_rcd_clk, t_rcd_ns);
+	if (sdram_freq != ddr_check)
+		t_rcd_clk++;
+
+	switch (t_rcd_clk) {
+	case 0:
+	case 1:
+		sdtr2 |= SDRAM_SDTR2_RCD_1_CLK;
+		break;
+	case 2:
+		sdtr2 |= SDRAM_SDTR2_RCD_2_CLK;
+		break;
+	case 3:
+		sdtr2 |= SDRAM_SDTR2_RCD_3_CLK;
+		break;
+	case 4:
+		sdtr2 |= SDRAM_SDTR2_RCD_4_CLK;
+		break;
+	default:
+		sdtr2 |= SDRAM_SDTR2_RCD_5_CLK;
+		break;
+	}
+
+	if (sdram_ddr1 == TRUE) { /* DDR1 */
+		if (sdram_freq < 200000000) {
+			sdtr2 |= SDRAM_SDTR2_WTR_1_CLK;
+			sdtr2 |= SDRAM_SDTR2_WPC_2_CLK;
+			sdtr2 |= SDRAM_SDTR2_RPC_2_CLK;
+		} else {
+			sdtr2 |= SDRAM_SDTR2_WTR_2_CLK;
+			sdtr2 |= SDRAM_SDTR2_WPC_3_CLK;
+			sdtr2 |= SDRAM_SDTR2_RPC_2_CLK;
+		}
+	} else { /* DDR2 */
+		/* loop through all the DIMM slots on the board */
+		for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+			/* If a dimm is installed in a particular slot ... */
+			if (dimm_populated[dimm_num] != SDRAM_NONE) {
+				t_wpc_ns = max(t_wtr_ns, spd_read(iic0_dimm_addr[dimm_num], 36) >> 2);
+				t_wtr_ns = max(t_wtr_ns, spd_read(iic0_dimm_addr[dimm_num], 37) >> 2);
+				t_rpc_ns = max(t_rpc_ns, spd_read(iic0_dimm_addr[dimm_num], 38) >> 2);
+			}
+		}
+
+		/*
+		 * convert from nanoseconds to ddr clocks
+		 * round up if necessary
+		 */
+		t_wpc_clk = MULDIV64(sdram_freq, t_wpc_ns, ONE_BILLION);
+		ddr_check = MULDIV64(ONE_BILLION, t_wpc_clk, t_wpc_ns);
+		if (sdram_freq != ddr_check)
+			t_wpc_clk++;
+
+		switch (t_wpc_clk) {
+		case 0:
+		case 1:
+		case 2:
+			sdtr2 |= SDRAM_SDTR2_WPC_2_CLK;
+			break;
+		case 3:
+			sdtr2 |= SDRAM_SDTR2_WPC_3_CLK;
+			break;
+		case 4:
+			sdtr2 |= SDRAM_SDTR2_WPC_4_CLK;
+			break;
+		case 5:
+			sdtr2 |= SDRAM_SDTR2_WPC_5_CLK;
+			break;
+		default:
+			sdtr2 |= SDRAM_SDTR2_WPC_6_CLK;
+			break;
+		}
+
+		/*
+		 * convert from nanoseconds to ddr clocks
+		 * round up if necessary
+		 */
+		t_wtr_clk = MULDIV64(sdram_freq, t_wtr_ns, ONE_BILLION);
+		ddr_check = MULDIV64(ONE_BILLION, t_wtr_clk, t_wtr_ns);
+		if (sdram_freq != ddr_check)
+			t_wtr_clk++;
+
+		switch (t_wtr_clk) {
+		case 0:
+		case 1:
+			sdtr2 |= SDRAM_SDTR2_WTR_1_CLK;
+			break;
+		case 2:
+			sdtr2 |= SDRAM_SDTR2_WTR_2_CLK;
+			break;
+		case 3:
+			sdtr2 |= SDRAM_SDTR2_WTR_3_CLK;
+			break;
+		default:
+			sdtr2 |= SDRAM_SDTR2_WTR_4_CLK;
+			break;
+		}
+
+		/*
+		 * convert from nanoseconds to ddr clocks
+		 * round up if necessary
+		 */
+		t_rpc_clk = MULDIV64(sdram_freq, t_rpc_ns, ONE_BILLION);
+		ddr_check = MULDIV64(ONE_BILLION, t_rpc_clk, t_rpc_ns);
+		if (sdram_freq != ddr_check)
+			t_rpc_clk++;
+
+		switch (t_rpc_clk) {
+		case 0:
+		case 1:
+		case 2:
+			sdtr2 |= SDRAM_SDTR2_RPC_2_CLK;
+			break;
+		case 3:
+			sdtr2 |= SDRAM_SDTR2_RPC_3_CLK;
+			break;
+		default:
+			sdtr2 |= SDRAM_SDTR2_RPC_4_CLK;
+			break;
+		}
+	}
+
+	/* default value */
+	sdtr2 |= SDRAM_SDTR2_XSNR_16_CLK;
+
+	/*
+	 * convert t_rrd from nanoseconds to ddr clocks
+	 * round up if necessary
+	 */
+	t_rrd_clk = MULDIV64(sdram_freq, t_rrd_ns, ONE_BILLION);
+	ddr_check = MULDIV64(ONE_BILLION, t_rrd_clk, t_rrd_ns);
+	if (sdram_freq != ddr_check)
+		t_rrd_clk++;
+
+	if (t_rrd_clk == 3)
+		sdtr2 |= SDRAM_SDTR2_RRD_3_CLK;
+	else
+		sdtr2 |= SDRAM_SDTR2_RRD_2_CLK;
+
+	/*
+	 * convert t_rp from nanoseconds to ddr clocks
+	 * round up if necessary
+	 */
+	t_rp_clk = MULDIV64(sdram_freq, t_rp_ns, ONE_BILLION);
+	ddr_check = MULDIV64(ONE_BILLION, t_rp_clk, t_rp_ns);
+	if (sdram_freq != ddr_check)
+		t_rp_clk++;
+
+	switch (t_rp_clk) {
+	case 0:
+	case 1:
+	case 2:
+	case 3:
+		sdtr2 |= SDRAM_SDTR2_RP_3_CLK;
+		break;
+	case 4:
+		sdtr2 |= SDRAM_SDTR2_RP_4_CLK;
+		break;
+	case 5:
+		sdtr2 |= SDRAM_SDTR2_RP_5_CLK;
+		break;
+	case 6:
+		sdtr2 |= SDRAM_SDTR2_RP_6_CLK;
+		break;
+	default:
+		sdtr2 |= SDRAM_SDTR2_RP_7_CLK;
+		break;
+	}
+
+	mtsdram(SDRAM_SDTR2, sdtr2);
+
+	/*------------------------------------------------------------------
+	 * Set the SDRAM Timing Reg 3, SDRAM_TR3
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_SDTR3, sdtr3);
+	sdtr3 &= ~(SDRAM_SDTR3_RAS_MASK  | SDRAM_SDTR3_RC_MASK |
+		   SDRAM_SDTR3_XCS_MASK | SDRAM_SDTR3_RFC_MASK);
+
+	/*
+	 * convert t_ras from nanoseconds to ddr clocks
+	 * round up if necessary
+	 */
+	t_ras_clk = MULDIV64(sdram_freq, t_ras_ns, ONE_BILLION);
+	ddr_check = MULDIV64(ONE_BILLION, t_ras_clk, t_ras_ns);
+	if (sdram_freq != ddr_check)
+		t_ras_clk++;
+
+	sdtr3 |= SDRAM_SDTR3_RAS_ENCODE(t_ras_clk);
+
+	/*
+	 * convert t_rc from nanoseconds to ddr clocks
+	 * round up if necessary
+	 */
+	t_rc_clk = MULDIV64(sdram_freq, t_rc_ns, ONE_BILLION);
+	ddr_check = MULDIV64(ONE_BILLION, t_rc_clk, t_rc_ns);
+	if (sdram_freq != ddr_check)
+		t_rc_clk++;
+
+	sdtr3 |= SDRAM_SDTR3_RC_ENCODE(t_rc_clk);
+
+	/* default xcs value */
+	sdtr3 |= SDRAM_SDTR3_XCS;
+
+	/*
+	 * convert t_rfc from nanoseconds to ddr clocks
+	 * round up if necessary
+	 */
+	t_rfc_clk = MULDIV64(sdram_freq, t_rfc_ns, ONE_BILLION);
+	ddr_check = MULDIV64(ONE_BILLION, t_rfc_clk, t_rfc_ns);
+	if (sdram_freq != ddr_check)
+		t_rfc_clk++;
+
+	sdtr3 |= SDRAM_SDTR3_RFC_ENCODE(t_rfc_clk);
+
+	mtsdram(SDRAM_SDTR3, sdtr3);
+}
+
+/*-----------------------------------------------------------------------------+
+ * program_bxcf.
+ *-----------------------------------------------------------------------------*/
+static void program_bxcf(unsigned long *dimm_populated,
+			 unsigned char *iic0_dimm_addr,
+			 unsigned long num_dimm_banks)
+{
+	unsigned long dimm_num;
+	unsigned long num_col_addr;
+	unsigned long num_ranks;
+	unsigned long num_banks;
+	unsigned long mode;
+	unsigned long ind_rank;
+	unsigned long ind;
+	unsigned long ind_bank;
+	unsigned long bank_0_populated;
+
+	/*------------------------------------------------------------------
+	 * Set the BxCF regs.  First, wipe out the bank config registers.
+	 *-----------------------------------------------------------------*/
+	mtdcr(SDRAMC_CFGADDR, SDRAM_MB0CF);
+	mtdcr(SDRAMC_CFGDATA, 0x00000000);
+	mtdcr(SDRAMC_CFGADDR, SDRAM_MB1CF);
+	mtdcr(SDRAMC_CFGDATA, 0x00000000);
+	mtdcr(SDRAMC_CFGADDR, SDRAM_MB2CF);
+	mtdcr(SDRAMC_CFGDATA, 0x00000000);
+	mtdcr(SDRAMC_CFGADDR, SDRAM_MB3CF);
+	mtdcr(SDRAMC_CFGDATA, 0x00000000);
+
+	mode = SDRAM_BXCF_M_BE_ENABLE;
+
+	bank_0_populated = 0;
+
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		if (dimm_populated[dimm_num] != SDRAM_NONE) {
+			num_col_addr = spd_read(iic0_dimm_addr[dimm_num], 4);
+			num_ranks = spd_read(iic0_dimm_addr[dimm_num], 5);
+			if ((spd_read(iic0_dimm_addr[dimm_num], 2)) == 0x08)
+				num_ranks = (num_ranks & 0x0F) +1;
+			else
+				num_ranks = num_ranks & 0x0F;
+
+			num_banks = spd_read(iic0_dimm_addr[dimm_num], 17);
+
+			for (ind_bank = 0; ind_bank < 2; ind_bank++) {
+				if (num_banks == 4)
+					ind = 0;
+				else
+					ind = 5;
+				switch (num_col_addr) {
+				case 0x08:
+					mode |= (SDRAM_BXCF_M_AM_0 + ind);
+					break;
+				case 0x09:
+					mode |= (SDRAM_BXCF_M_AM_1 + ind);
+					break;
+				case 0x0A:
+					mode |= (SDRAM_BXCF_M_AM_2 + ind);
+					break;
+				case 0x0B:
+					mode |= (SDRAM_BXCF_M_AM_3 + ind);
+					break;
+				case 0x0C:
+					mode |= (SDRAM_BXCF_M_AM_4 + ind);
+					break;
+				default:
+					printf("DDR-SDRAM: DIMM %d BxCF configuration.\n",
+					       (unsigned int)dimm_num);
+					printf("ERROR: Unsupported value for number of "
+					       "column addresses: %d.\n", (unsigned int)num_col_addr);
+					printf("Replace the DIMM module with a supported DIMM.\n\n");
+					hang();
+				}
+			}
+
+			if ((dimm_populated[dimm_num] != SDRAM_NONE)&& (dimm_num ==1))
+				bank_0_populated = 1;
+
+			for (ind_rank = 0; ind_rank < num_ranks; ind_rank++) {
+				mtdcr(SDRAMC_CFGADDR, SDRAM_MB0CF + ((dimm_num + bank_0_populated + ind_rank) << 2));
+				mtdcr(SDRAMC_CFGDATA, mode);
+			}
+		}
+	}
+}
+
+/*------------------------------------------------------------------
+ * program memory queue.
+ *-----------------------------------------------------------------*/
+static void program_memory_queue(unsigned long *dimm_populated,
+				 unsigned char *iic0_dimm_addr,
+				 unsigned long num_dimm_banks)
+{
+	unsigned long dimm_num;
+	unsigned long rank_base_addr;
+	unsigned long rank_reg;
+	unsigned long rank_size_bytes;
+	unsigned long rank_size_id;
+	unsigned long num_ranks;
+	unsigned long baseadd_size;
+	unsigned long i;
+	unsigned long bank_0_populated = 0;
+
+	/*------------------------------------------------------------------
+	 * Reset the rank_base_address.
+	 *-----------------------------------------------------------------*/
+	rank_reg   = SDRAM_R0BAS;
+
+	rank_base_addr = 0x00000000;
+
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		if (dimm_populated[dimm_num] != SDRAM_NONE) {
+			num_ranks = spd_read(iic0_dimm_addr[dimm_num], 5);
+			if ((spd_read(iic0_dimm_addr[dimm_num], 2)) == 0x08)
+				num_ranks = (num_ranks & 0x0F) + 1;
+			else
+				num_ranks = num_ranks & 0x0F;
+
+			rank_size_id = spd_read(iic0_dimm_addr[dimm_num], 31);
+
+			/*------------------------------------------------------------------
+			 * Set the sizes
+			 *-----------------------------------------------------------------*/
+			baseadd_size = 0;
+			rank_size_bytes = 1024 * 1024 * rank_size_id;
+			switch (rank_size_id) {
+			case 0x02:
+				baseadd_size |= SDRAM_RXBAS_SDSZ_8;
+				break;
+			case 0x04:
+				baseadd_size |= SDRAM_RXBAS_SDSZ_16;
+				break;
+			case 0x08:
+				baseadd_size |= SDRAM_RXBAS_SDSZ_32;
+				break;
+			case 0x10:
+				baseadd_size |= SDRAM_RXBAS_SDSZ_64;
+				break;
+			case 0x20:
+				baseadd_size |= SDRAM_RXBAS_SDSZ_128;
+				break;
+			case 0x40:
+				baseadd_size |= SDRAM_RXBAS_SDSZ_256;
+				break;
+			case 0x80:
+				baseadd_size |= SDRAM_RXBAS_SDSZ_512;
+				break;
+			default:
+				printf("DDR-SDRAM: DIMM %d memory queue configuration.\n",
+				       (unsigned int)dimm_num);
+				printf("ERROR: Unsupported value for the banksize: %d.\n",
+				       (unsigned int)rank_size_id);
+				printf("Replace the DIMM module with a supported DIMM.\n\n");
+				hang();
+			}
+
+			if ((dimm_populated[dimm_num] != SDRAM_NONE) && (dimm_num == 1))
+				bank_0_populated = 1;
+
+			for (i = 0; i < num_ranks; i++)	{
+				mtdcr_any(rank_reg+i+dimm_num+bank_0_populated,
+					  (rank_base_addr & SDRAM_RXBAS_SDBA_MASK) |
+					  baseadd_size);
+				rank_base_addr += rank_size_bytes;
+			}
+		}
+	}
+}
+
+/*-----------------------------------------------------------------------------+
+ * is_ecc_enabled.
+ *-----------------------------------------------------------------------------*/
+static unsigned long is_ecc_enabled(void)
+{
+	unsigned long dimm_num;
+	unsigned long ecc;
+	unsigned long val;
+
+	ecc = 0;
+	/* loop through all the DIMM slots on the board */
+	for (dimm_num = 0; dimm_num < MAXDIMMS; dimm_num++) {
+		mfsdram(SDRAM_MCOPT1, val);
+		ecc = max(ecc, SDRAM_MCOPT1_MCHK_CHK_DECODE(val));
+	}
+
+	return(ecc);
+}
+
+/*-----------------------------------------------------------------------------+
+ * program_ecc.
+ *-----------------------------------------------------------------------------*/
+static void program_ecc(unsigned long *dimm_populated,
+			unsigned char *iic0_dimm_addr,
+			unsigned long num_dimm_banks)
+{
+	unsigned long mcopt1;
+	unsigned long mcopt2;
+	unsigned long mcstat;
+	unsigned long dimm_num;
+	unsigned long ecc;
+
+	ecc = 0;
+	/* loop through all the DIMM slots on the board */
+	for (dimm_num = 0; dimm_num < MAXDIMMS; dimm_num++) {
+		/* If a dimm is installed in a particular slot ... */
+		if (dimm_populated[dimm_num] != SDRAM_NONE)
+			ecc = max(ecc, spd_read(iic0_dimm_addr[dimm_num], 11));
+	}
+	if (ecc == 0)
+		return;
+
+	mfsdram(SDRAM_MCOPT1, mcopt1);
+	mfsdram(SDRAM_MCOPT2, mcopt2);
+
+	if ((mcopt1 & SDRAM_MCOPT1_MCHK_MASK) != SDRAM_MCOPT1_MCHK_NON) {
+		/* DDR controller must be enabled and not in self-refresh. */
+		mfsdram(SDRAM_MCSTAT, mcstat);
+		if (((mcopt2 & SDRAM_MCOPT2_DCEN_MASK) == SDRAM_MCOPT2_DCEN_ENABLE)
+		    && ((mcopt2 & SDRAM_MCOPT2_SREN_MASK) == SDRAM_MCOPT2_SREN_EXIT)
+		    && ((mcstat & (SDRAM_MCSTAT_MIC_MASK | SDRAM_MCSTAT_SRMS_MASK))
+			== (SDRAM_MCSTAT_MIC_COMP | SDRAM_MCSTAT_SRMS_NOT_SF))) {
+
+			program_ecc_addr(0, sdram_memsize());
+		}
+	}
+
+	return;
+}
+
+/*-----------------------------------------------------------------------------+
+ * program_ecc_addr.
+ *-----------------------------------------------------------------------------*/
+static void program_ecc_addr(unsigned long start_address,
+			     unsigned long num_bytes)
+{
+	unsigned long current_address;
+	unsigned long end_address;
+	unsigned long address_increment;
+	unsigned long mcopt1;
+
+	current_address = start_address;
+	mfsdram(SDRAM_MCOPT1, mcopt1);
+	if ((mcopt1 & SDRAM_MCOPT1_MCHK_MASK) != SDRAM_MCOPT1_MCHK_NON) {
+		mtsdram(SDRAM_MCOPT1,
+			(mcopt1 & ~SDRAM_MCOPT1_MCHK_MASK) | SDRAM_MCOPT1_MCHK_GEN);
+		sync();
+		eieio();
+		wait_ddr_idle();
+
+		/* ECC bit set method for non-cached memory */
+		if ((mcopt1 & SDRAM_MCOPT1_DMWD_MASK) == SDRAM_MCOPT1_DMWD_32)
+			address_increment = 4;
+		else
+			address_increment = 8;
+		end_address = current_address + num_bytes;
+
+		while (current_address < end_address) {
+			*((unsigned long *)current_address) = 0x00000000;
+			current_address += address_increment;
+		}
+		sync();
+		eieio();
+		wait_ddr_idle();
+
+		mtsdram(SDRAM_MCOPT1,
+			(mcopt1 & ~SDRAM_MCOPT1_MCHK_MASK) | SDRAM_MCOPT1_MCHK_CHK);
+		sync();
+		eieio();
+		wait_ddr_idle();
+	}
+}
+
+/*-----------------------------------------------------------------------------+
+ * program_DQS_calibration.
+ *-----------------------------------------------------------------------------*/
+static void program_DQS_calibration(unsigned long *dimm_populated,
+				    unsigned char *iic0_dimm_addr,
+				    unsigned long num_dimm_banks)
+{
+	unsigned long val;
+
+#ifdef HARD_CODED_DQS /* calibration test with hardvalues */
+	mtsdram(SDRAM_RQDC, 0x80000037);
+	mtsdram(SDRAM_RDCC, 0x40000000);
+	mtsdram(SDRAM_RFDC, 0x000001DF);
+
+	test();
+#else
+	/*------------------------------------------------------------------
+	 * Program RDCC register
+	 * Read sample cycle auto-update enable
+	 *-----------------------------------------------------------------*/
+
+	/*
+	 * Modified for the Katmai platform:  with some DIMMs, the DDR2
+	 * controller automatically selects the T2 read cycle, but this
+	 * proves unreliable.  Go ahead and force the DDR2 controller
+	 * to use the T4 sample and disable the automatic update of the
+	 * RDSS field.
+	 */
+	mfsdram(SDRAM_RDCC, val);
+	mtsdram(SDRAM_RDCC,
+		(val & ~(SDRAM_RDCC_RDSS_MASK | SDRAM_RDCC_RSAE_MASK))
+		| (SDRAM_RDCC_RDSS_T4 | SDRAM_RDCC_RSAE_DISABLE));
+
+	/*------------------------------------------------------------------
+	 * Program RQDC register
+	 * Internal DQS delay mechanism enable
+	 *-----------------------------------------------------------------*/
+	mtsdram(SDRAM_RQDC, (SDRAM_RQDC_RQDE_ENABLE|SDRAM_RQDC_RQFD_ENCODE(0x38)));
+
+	/*------------------------------------------------------------------
+	 * Program RFDC register
+	 * Set Feedback Fractional Oversample
+	 * Auto-detect read sample cycle enable
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_RFDC, val);
+	mtsdram(SDRAM_RFDC,
+		(val & ~(SDRAM_RFDC_ARSE_MASK | SDRAM_RFDC_RFOS_MASK |
+			 SDRAM_RFDC_RFFD_MASK))
+		| (SDRAM_RFDC_ARSE_ENABLE | SDRAM_RFDC_RFOS_ENCODE(0) |
+		   SDRAM_RFDC_RFFD_ENCODE(0)));
+
+	DQS_calibration_process();
+#endif
+}
+
+static u32 short_mem_test(void)
+{
+	u32 *membase;
+	u32 bxcr_num;
+	u32 bxcf;
+	int i;
+	int j;
+	u32 test[NUMMEMTESTS][NUMMEMWORDS] = {
+		{0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
+		 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF},
+		{0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
+		 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000},
+		{0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
+		 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555},
+		{0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
+		 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA},
+		{0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
+		 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A},
+		{0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
+		 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5},
+		{0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
+		 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA},
+		{0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
+		 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55} };
+
+	for (bxcr_num = 0; bxcr_num < MAXBXCF; bxcr_num++) {
+		mfsdram(SDRAM_MB0CF + (bxcr_num << 2), bxcf);
+
+		/* Banks enabled */
+		if ((bxcf & SDRAM_BXCF_M_BE_MASK) == SDRAM_BXCF_M_BE_ENABLE) {
+
+			/* Bank is enabled */
+			membase = (u32 *)(SDRAM_RXBAS_SDBA_DECODE(mfdcr_any(SDRAM_R0BAS+bxcr_num)));
+
+			/*------------------------------------------------------------------
+			 * Run the short memory test.
+			 *-----------------------------------------------------------------*/
+			for (i = 0; i < NUMMEMTESTS; i++) {
+				for (j = 0; j < NUMMEMWORDS; j++) {
+					membase[j] = test[i][j];
+					ppcDcbf((u32)&(membase[j]));
+				}
+				sync();
+				for (j = 0; j < NUMMEMWORDS; j++) {
+					if (membase[j] != test[i][j]) {
+						ppcDcbf((u32)&(membase[j]));
+						break;
+					}
+					ppcDcbf((u32)&(membase[j]));
+				}
+				sync();
+				if (j < NUMMEMWORDS)
+					break;
+			}
+			if (i < NUMMEMTESTS)
+				break;
+		}	/* if bank enabled */
+	}		/* for bxcf_num */
+
+	return bxcr_num;
+}
+
+#ifndef HARD_CODED_DQS
+/*-----------------------------------------------------------------------------+
+ * DQS_calibration_process.
+ *-----------------------------------------------------------------------------*/
+static void DQS_calibration_process(void)
+{
+	unsigned long ecc_temp;
+	unsigned long rfdc_reg;
+	unsigned long rffd;
+	unsigned long rqdc_reg;
+	unsigned long rqfd;
+	unsigned long bxcr_num;
+	unsigned long val;
+	long rqfd_average;
+	long rffd_average;
+	long max_start;
+	long min_end;
+	unsigned long begin_rqfd[MAXRANKS];
+	unsigned long begin_rffd[MAXRANKS];
+	unsigned long end_rqfd[MAXRANKS];
+	unsigned long end_rffd[MAXRANKS];
+	char window_found;
+	unsigned long dlycal;
+	unsigned long dly_val;
+	unsigned long max_pass_length;
+	unsigned long current_pass_length;
+	unsigned long current_fail_length;
+	unsigned long current_start;
+	long max_end;
+	unsigned char fail_found;
+	unsigned char pass_found;
+
+	/*------------------------------------------------------------------
+	 * Test to determine the best read clock delay tuning bits.
+	 *
+	 * Before the DDR controller can be used, the read clock delay needs to be
+	 * set.  This is SDRAM_RQDC[RQFD] and SDRAM_RFDC[RFFD].
+	 * This value cannot be hardcoded into the program because it changes
+	 * depending on the board's setup and environment.
+	 * To do this, all delay values are tested to see if they
+	 * work or not.  By doing this, you get groups of fails with groups of
+	 * passing values.  The idea is to find the start and end of a passing
+	 * window and take the center of it to use as the read clock delay.
+	 *
+	 * A failure has to be seen first so that when we hit a pass, we know
+	 * that it is truely the start of the window.  If we get passing values
+	 * to start off with, we don't know if we are at the start of the window.
+	 *
+	 * The code assumes that a failure will always be found.
+	 * If a failure is not found, there is no easy way to get the middle
+	 * of the passing window.  I guess we can pretty much pick any value
+	 * but some values will be better than others.  Since the lowest speed
+	 * we can clock the DDR interface at is 200 MHz (2x 100 MHz PLB speed),
+	 * from experimentation it is safe to say you will always have a failure.
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_MCOPT1, ecc_temp);
+	ecc_temp &= SDRAM_MCOPT1_MCHK_MASK;
+	mfsdram(SDRAM_MCOPT1, val);
+	mtsdram(SDRAM_MCOPT1, (val & ~SDRAM_MCOPT1_MCHK_MASK) |
+		SDRAM_MCOPT1_MCHK_NON);
+
+	max_start = 0;
+	min_end = 0;
+	begin_rqfd[0] = 0;
+	begin_rffd[0] = 0;
+	begin_rqfd[1] = 0;
+	begin_rffd[1] = 0;
+	end_rqfd[0] = 0;
+	end_rffd[0] = 0;
+	end_rqfd[1] = 0;
+	end_rffd[1] = 0;
+	window_found = FALSE;
+
+	max_pass_length = 0;
+	max_start = 0;
+	max_end = 0;
+	current_pass_length = 0;
+	current_fail_length = 0;
+	current_start = 0;
+	window_found = FALSE;
+	fail_found = FALSE;
+	pass_found = FALSE;
+
+	/* first fix RQDC[RQFD] to an average of 80 degre phase shift to find RFDC[RFFD] */
+	/* rqdc_reg = mfsdram(SDRAM_RQDC) & ~(SDRAM_RQDC_RQFD_MASK); */
+
+	/*
+	 * get the delay line calibration register value
+	 */
+	mfsdram(SDRAM_DLCR, dlycal);
+	dly_val = SDRAM_DLYCAL_DLCV_DECODE(dlycal) << 2;
+
+	for (rffd = 0; rffd <= SDRAM_RFDC_RFFD_MAX; rffd++) {
+		mfsdram(SDRAM_RFDC, rfdc_reg);
+		rfdc_reg &= ~(SDRAM_RFDC_RFFD_MASK);
+
+		/*------------------------------------------------------------------
+		 * Set the timing reg for the test.
+		 *-----------------------------------------------------------------*/
+		mtsdram(SDRAM_RFDC, rfdc_reg | SDRAM_RFDC_RFFD_ENCODE(rffd));
+
+		/* do the small memory test */
+		bxcr_num = short_mem_test();
+
+		/*------------------------------------------------------------------
+		 * See if the rffd value passed.
+		 *-----------------------------------------------------------------*/
+		if (bxcr_num == MAXBXCF) {
+			if (fail_found == TRUE) {
+				pass_found = TRUE;
+				if (current_pass_length == 0)
+					current_start = rffd;
+
+				current_fail_length = 0;
+				current_pass_length++;
+
+				if (current_pass_length > max_pass_length) {
+					max_pass_length = current_pass_length;
+					max_start = current_start;
+					max_end = rffd;
+				}
+			}
+		} else {
+			current_pass_length = 0;
+			current_fail_length++;
+
+			if (current_fail_length >= (dly_val >> 2)) {
+				if (fail_found == FALSE) {
+					fail_found = TRUE;
+				} else if (pass_found == TRUE) {
+					window_found = TRUE;
+					break;
+				}
+			}
+		}
+	}		/* for rffd */
+
+
+	/*------------------------------------------------------------------
+	 * Set the average RFFD value
+	 *-----------------------------------------------------------------*/
+	rffd_average = ((max_start + max_end) >> 1);
+
+	if (rffd_average < 0)
+		rffd_average = 0;
+
+	if (rffd_average > SDRAM_RFDC_RFFD_MAX)
+		rffd_average = SDRAM_RFDC_RFFD_MAX;
+	/* now fix RFDC[RFFD] found and find RQDC[RQFD] */
+	mtsdram(SDRAM_RFDC, rfdc_reg | SDRAM_RFDC_RFFD_ENCODE(rffd_average));
+
+	max_pass_length = 0;
+	max_start = 0;
+	max_end = 0;
+	current_pass_length = 0;
+	current_fail_length = 0;
+	current_start = 0;
+	window_found = FALSE;
+	fail_found = FALSE;
+	pass_found = FALSE;
+
+	for (rqfd = 0; rqfd <= SDRAM_RQDC_RQFD_MAX; rqfd++) {
+		mfsdram(SDRAM_RQDC, rqdc_reg);
+		rqdc_reg &= ~(SDRAM_RQDC_RQFD_MASK);
+
+		/*------------------------------------------------------------------
+		 * Set the timing reg for the test.
+		 *-----------------------------------------------------------------*/
+		mtsdram(SDRAM_RQDC, rqdc_reg | SDRAM_RQDC_RQFD_ENCODE(rqfd));
+
+		/* do the small memory test */
+		bxcr_num = short_mem_test();
+
+		/*------------------------------------------------------------------
+		 * See if the rffd value passed.
+		 *-----------------------------------------------------------------*/
+		if (bxcr_num == MAXBXCF) {
+			if (fail_found == TRUE) {
+				pass_found = TRUE;
+				if (current_pass_length == 0)
+					current_start = rqfd;
+
+				current_fail_length = 0;
+				current_pass_length++;
+
+				if (current_pass_length > max_pass_length) {
+					max_pass_length = current_pass_length;
+					max_start = current_start;
+					max_end = rqfd;
+				}
+			}
+		} else {
+			current_pass_length = 0;
+			current_fail_length++;
+
+			if (fail_found == FALSE) {
+				fail_found = TRUE;
+			} else if (pass_found == TRUE) {
+				window_found = TRUE;
+				break;
+			}
+		}
+	}
+
+	/*------------------------------------------------------------------
+	 * Make sure we found the valid read passing window.  Halt if not
+	 *-----------------------------------------------------------------*/
+	if (window_found == FALSE) {
+		printf("ERROR: Cannot determine a common read delay for the "
+		       "DIMM(s) installed.\n");
+		debug("%s[%d] ERROR : \n", __FUNCTION__,__LINE__);
+		hang();
+	}
+
+	rqfd_average = ((max_start + max_end) >> 1);
+
+	if (rqfd_average < 0)
+		rqfd_average = 0;
+
+	if (rqfd_average > SDRAM_RQDC_RQFD_MAX)
+		rqfd_average = SDRAM_RQDC_RQFD_MAX;
+
+	/*------------------------------------------------------------------
+	 * Restore the ECC variable to what it originally was
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_MCOPT1, val);
+	mtsdram(SDRAM_MCOPT1, (val & ~SDRAM_MCOPT1_MCHK_MASK) | ecc_temp);
+
+	mtsdram(SDRAM_RQDC,
+		(rqdc_reg & ~SDRAM_RQDC_RQFD_MASK) |
+		SDRAM_RQDC_RQFD_ENCODE(rqfd_average));
+
+	mfsdram(SDRAM_DLCR, val);
+	debug("%s[%d] DLCR: 0x%08X\n", __FUNCTION__, __LINE__, val);
+	mfsdram(SDRAM_RQDC, val);
+	debug("%s[%d] RQDC: 0x%08X\n", __FUNCTION__, __LINE__, val);
+	mfsdram(SDRAM_RFDC, val);
+	debug("%s[%d] RFDC: 0x%08X\n", __FUNCTION__, __LINE__, val);
+}
+#else /* calibration test with hardvalues */
+/*-----------------------------------------------------------------------------+
+ * DQS_calibration_process.
+ *-----------------------------------------------------------------------------*/
+static void test(void)
+{
+	unsigned long dimm_num;
+	unsigned long ecc_temp;
+	unsigned long i, j;
+	unsigned long *membase;
+	unsigned long bxcf[MAXRANKS];
+	unsigned long val;
+	char window_found;
+	char begin_found[MAXDIMMS];
+	char end_found[MAXDIMMS];
+	char search_end[MAXDIMMS];
+	unsigned long test[NUMMEMTESTS][NUMMEMWORDS] = {
+		{0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
+		 0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF},
+		{0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000,
+		 0xFFFFFFFF, 0xFFFFFFFF, 0x00000000, 0x00000000},
+		{0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555,
+		 0xAAAAAAAA, 0xAAAAAAAA, 0x55555555, 0x55555555},
+		{0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA,
+		 0x55555555, 0x55555555, 0xAAAAAAAA, 0xAAAAAAAA},
+		{0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A,
+		 0xA5A5A5A5, 0xA5A5A5A5, 0x5A5A5A5A, 0x5A5A5A5A},
+		{0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5,
+		 0x5A5A5A5A, 0x5A5A5A5A, 0xA5A5A5A5, 0xA5A5A5A5},
+		{0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA,
+		 0xAA55AA55, 0xAA55AA55, 0x55AA55AA, 0x55AA55AA},
+		{0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55,
+		 0x55AA55AA, 0x55AA55AA, 0xAA55AA55, 0xAA55AA55} };
+
+	/*------------------------------------------------------------------
+	 * Test to determine the best read clock delay tuning bits.
+	 *
+	 * Before the DDR controller can be used, the read clock delay needs to be
+	 * set.  This is SDRAM_RQDC[RQFD] and SDRAM_RFDC[RFFD].
+	 * This value cannot be hardcoded into the program because it changes
+	 * depending on the board's setup and environment.
+	 * To do this, all delay values are tested to see if they
+	 * work or not.  By doing this, you get groups of fails with groups of
+	 * passing values.  The idea is to find the start and end of a passing
+	 * window and take the center of it to use as the read clock delay.
+	 *
+	 * A failure has to be seen first so that when we hit a pass, we know
+	 * that it is truely the start of the window.  If we get passing values
+	 * to start off with, we don't know if we are at the start of the window.
+	 *
+	 * The code assumes that a failure will always be found.
+	 * If a failure is not found, there is no easy way to get the middle
+	 * of the passing window.  I guess we can pretty much pick any value
+	 * but some values will be better than others.  Since the lowest speed
+	 * we can clock the DDR interface at is 200 MHz (2x 100 MHz PLB speed),
+	 * from experimentation it is safe to say you will always have a failure.
+	 *-----------------------------------------------------------------*/
+	mfsdram(SDRAM_MCOPT1, ecc_temp);
+	ecc_temp &= SDRAM_MCOPT1_MCHK_MASK;
+	mfsdram(SDRAM_MCOPT1, val);
+	mtsdram(SDRAM_MCOPT1, (val & ~SDRAM_MCOPT1_MCHK_MASK) |
+		SDRAM_MCOPT1_MCHK_NON);
+
+	window_found = FALSE;
+	begin_found[0] = FALSE;
+	end_found[0] = FALSE;
+	search_end[0] = FALSE;
+	begin_found[1] = FALSE;
+	end_found[1] = FALSE;
+	search_end[1] = FALSE;
+
+	for (dimm_num = 0; dimm_num < MAXDIMMS; dimm_num++) {
+		mfsdram(SDRAM_MB0CF + (bxcr_num << 2), bxcf[bxcr_num]);
+
+		/* Banks enabled */
+		if ((bxcf[dimm_num] & SDRAM_BXCF_M_BE_MASK) == SDRAM_BXCF_M_BE_ENABLE) {
+
+			/* Bank is enabled */
+			membase =
+				(unsigned long*)(SDRAM_RXBAS_SDBA_DECODE(mfdcr_any(SDRAM_R0BAS+dimm_num)));
+
+			/*------------------------------------------------------------------
+			 * Run the short memory test.
+			 *-----------------------------------------------------------------*/
+			for (i = 0; i < NUMMEMTESTS; i++) {
+				for (j = 0; j < NUMMEMWORDS; j++) {
+					membase[j] = test[i][j];
+					ppcDcbf((u32)&(membase[j]));
+				}
+				sync();
+				for (j = 0; j < NUMMEMWORDS; j++) {
+					if (membase[j] != test[i][j]) {
+						ppcDcbf((u32)&(membase[j]));
+						break;
+					}
+					ppcDcbf((u32)&(membase[j]));
+				}
+				sync();
+				if (j < NUMMEMWORDS)
+					break;
+			}
+
+			/*------------------------------------------------------------------
+			 * See if the rffd value passed.
+			 *-----------------------------------------------------------------*/
+			if (i < NUMMEMTESTS) {
+				if ((end_found[dimm_num] == FALSE) &&
+				    (search_end[dimm_num] == TRUE)) {
+					end_found[dimm_num] = TRUE;
+				}
+				if ((end_found[0] == TRUE) &&
+				    (end_found[1] == TRUE))
+					break;
+			} else {
+				if (begin_found[dimm_num] == FALSE) {
+					begin_found[dimm_num] = TRUE;
+					search_end[dimm_num] = TRUE;
+				}
+			}
+		} else {
+			begin_found[dimm_num] = TRUE;
+			end_found[dimm_num] = TRUE;
+		}
+	}
+
+	if ((begin_found[0] == TRUE) && (begin_found[1] == TRUE))
+		window_found = TRUE;
+
+	/*------------------------------------------------------------------
+	 * Make sure we found the valid read passing window.  Halt if not
+	 *-----------------------------------------------------------------*/
+	if (window_found == FALSE) {
+		printf("ERROR: Cannot determine a common read delay for the "
+		       "DIMM(s) installed.\n");
+		hang();
+	}
+
+	/*------------------------------------------------------------------
+	 * Restore the ECC variable to what it originally was
+	 *-----------------------------------------------------------------*/
+	mtsdram(SDRAM_MCOPT1,
+		(ppcMfdcr_sdram(SDRAM_MCOPT1) & ~SDRAM_MCOPT1_MCHK_MASK)
+		| ecc_temp);
+}
+#endif
+
+#if defined(DEBUG)
+static void ppc440sp_sdram_register_dump(void)
+{
+	unsigned int sdram_reg;
+	unsigned int sdram_data;
+	unsigned int dcr_data;
+
+	printf("\n  Register Dump:\n");
+	sdram_reg = SDRAM_MCSTAT;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MCSTAT    = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_MCOPT1;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MCOPT1    = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_MCOPT2;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MCOPT2    = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_MODT0;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MODT0     = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_MODT1;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MODT1     = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_MODT2;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MODT2     = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_MODT3;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MODT3     = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_CODT;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_CODT      = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_VVPR;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_VVPR      = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_OPARS;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_OPARS     = 0x%08X\n", sdram_data);
+	/*
+	 * OPAR2 is only used as a trigger register.
+	 * No data is contained in this register, and reading or writing
+	 * to is can cause bad things to happen (hangs).  Just skip it
+	 * and report NA
+	 * sdram_reg = SDRAM_OPAR2;
+	 * mfsdram(sdram_reg, sdram_data);
+	 * printf("        SDRAM_OPAR2     = 0x%08X\n", sdram_data);
+	 */
+	printf("        SDRAM_OPART     = N/A       ");
+	sdram_reg = SDRAM_RTR;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_RTR       = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_MB0CF;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MB0CF     = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_MB1CF;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MB1CF     = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_MB2CF;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MB2CF     = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_MB3CF;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MB3CF     = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_INITPLR0;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR0  = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_INITPLR1;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR1  = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_INITPLR2;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR2  = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_INITPLR3;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR3  = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_INITPLR4;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR4  = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_INITPLR5;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR5  = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_INITPLR6;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR6  = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_INITPLR7;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR7  = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_INITPLR8;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR8  = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_INITPLR9;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR9  = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_INITPLR10;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR10 = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_INITPLR11;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR11 = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_INITPLR12;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR12 = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_INITPLR13;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR13 = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_INITPLR14;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR14 = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_INITPLR15;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_INITPLR15 = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_RQDC;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_RQDC      = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_RFDC;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_RFDC      = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_RDCC;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_RDCC      = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_DLCR;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_DLCR      = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_CLKTR;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_CLKTR     = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_WRDTR;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_WRDTR     = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_SDTR1;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_SDTR1     = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_SDTR2;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_SDTR2     = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_SDTR3;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_SDTR3     = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_MMODE;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MMODE     = 0x%08X\n", sdram_data);
+	sdram_reg = SDRAM_MEMODE;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_MEMODE    = 0x%08X", sdram_data);
+	sdram_reg = SDRAM_ECCCR;
+	mfsdram(sdram_reg, sdram_data);
+	printf("        SDRAM_ECCCR     = 0x%08X\n\n", sdram_data);
+
+	dcr_data = mfdcr(SDRAM_R0BAS);
+	printf("        MQ0_B0BAS       = 0x%08X", dcr_data);
+	dcr_data = mfdcr(SDRAM_R1BAS);
+	printf("        MQ1_B0BAS       = 0x%08X\n", dcr_data);
+	dcr_data = mfdcr(SDRAM_R2BAS);
+	printf("        MQ2_B0BAS       = 0x%08X", dcr_data);
+	dcr_data = mfdcr(SDRAM_R3BAS);
+	printf("        MQ3_B0BAS       = 0x%08X\n", dcr_data);
+}
+#endif
+#endif /* CONFIG_SPD_EEPROM */