Add 440EPx DDR2 SPD DIMM support

This patch adds SPD DDR2 support for the 440EPx ("Denali") SDRAM
controller.  It should also work on the 440GRx.  It is based on the DDR2
SPD code for the 440EP/440EPx, but makes no provision for DDR1 support.

This code has been tested on prototype Korat boards with three Kingston
DIMMS: 512 MiB ECC (one rank), 512 MiB non-ECC (one rank) and 1 GiB ECC
(two ranks).  The Korat board has a single DIMM socket, but support has
been provided (though not tested) for boards with two DIMM sockets.

Signed-off-by: Larry Johnson <lrj@acm.org>

1 files changed, 1254 insertions, 0 deletions

diff --git a/cpu/ppc4xx/denali_spd_ddr2.c b/cpu/ppc4xx/denali_spd_ddr2.c
new file mode 100644
index 0000000..825bc21
--- /dev/null
+++ b/cpu/ppc4xx/denali_spd_ddr2.c
@@ -0,0 +1,1254 @@
+/*
+ * cpu/ppc4xx/denali_spd_ddr2.c
+ * This SPD SDRAM detection code supports AMCC PPC44x CPUs with a Denali-core
+ * DDR2 controller, specifically the 440EPx/GRx.
+ *
+ * (C) Copyright 2007
+ * Larry Johnson, lrj@acm.org.
+ *
+ * Based primarily on cpu/ppc4xx/4xx_spd_ddr2.c, which is...
+ *
+ * (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 <command.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_440EPX) || defined(CONFIG_440GRX))
+
+/*-----------------------------------------------------------------------------+
+ * Defines
+ *-----------------------------------------------------------------------------*/
+#ifndef	TRUE
+#define TRUE		1
+#endif
+#ifndef FALSE
+#define FALSE		0
+#endif
+
+#define MAXDIMMS	2
+#define MAXRANKS	2
+
+#define ONE_BILLION	1000000000
+
+#define MULDIV64(m1, m2, d)	(u32)(((u64)(m1) * (u64)(m2)) / (u64)(d))
+
+#define DLL_DQS_DELAY	0x19
+#define DLL_DQS_BYPASS	0x0B
+#define DQS_OUT_SHIFT	0x7F
+
+/*
+ * This DDR2 setup code can dynamically setup the TLB entries for the DDR2 memory
+ * region. Right now the cache should still be disabled in U-Boot because of the
+ * EMAC driver, that need it's buffer descriptor to be located in non cached
+ * memory.
+ *
+ * If at some time this restriction doesn't apply anymore, just define
+ * CFG_ENABLE_SDRAM_CACHE in the board config file and this code should setup
+ * everything correctly.
+ */
+#if defined(CFG_ENABLE_SDRAM_CACHE)
+#define MY_TLB_WORD2_I_ENABLE	0			/* enable caching on SDRAM */
+#else
+#define MY_TLB_WORD2_I_ENABLE	TLB_WORD2_I_ENABLE	/* disable caching on SDRAM */
+#endif
+
+/*-----------------------------------------------------------------------------+
+ * Prototypes
+ *-----------------------------------------------------------------------------*/
+extern int denali_wait_for_dlllock(void);
+extern void denali_core_search_data_eye(void);
+extern void dcbz_area(u32 start_address, u32 num_bytes);
+extern void dflush(void);
+
+/*
+ * Board-specific Platform code can reimplement spd_ddr_init_hang () if needed
+ */
+void __spd_ddr_init_hang(void)
+{
+	hang();
+}
+void spd_ddr_init_hang(void)
+    __attribute__ ((weak, alias("__spd_ddr_init_hang")));
+
+#if defined(DEBUG)
+static void print_mcsr(void)
+{
+	printf("MCSR = 0x%08X\n", mfspr(SPRN_MCSR));
+}
+
+static void denali_sdram_register_dump(void)
+{
+	unsigned int sdram_data;
+
+	printf("\n  Register Dump:\n");
+	mfsdram(DDR0_00, sdram_data);
+	printf("        DDR0_00 = 0x%08X", sdram_data);
+	mfsdram(DDR0_01, sdram_data);
+	printf("        DDR0_01 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_02, sdram_data);
+	printf("        DDR0_02 = 0x%08X", sdram_data);
+	mfsdram(DDR0_03, sdram_data);
+	printf("        DDR0_03 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_04, sdram_data);
+	printf("        DDR0_04 = 0x%08X", sdram_data);
+	mfsdram(DDR0_05, sdram_data);
+	printf("        DDR0_05 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_06, sdram_data);
+	printf("        DDR0_06 = 0x%08X", sdram_data);
+	mfsdram(DDR0_07, sdram_data);
+	printf("        DDR0_07 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_08, sdram_data);
+	printf("        DDR0_08 = 0x%08X", sdram_data);
+	mfsdram(DDR0_09, sdram_data);
+	printf("        DDR0_09 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_10, sdram_data);
+	printf("        DDR0_10 = 0x%08X", sdram_data);
+	mfsdram(DDR0_11, sdram_data);
+	printf("        DDR0_11 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_12, sdram_data);
+	printf("        DDR0_12 = 0x%08X", sdram_data);
+	mfsdram(DDR0_14, sdram_data);
+	printf("        DDR0_14 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_17, sdram_data);
+	printf("        DDR0_17 = 0x%08X", sdram_data);
+	mfsdram(DDR0_18, sdram_data);
+	printf("        DDR0_18 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_19, sdram_data);
+	printf("        DDR0_19 = 0x%08X", sdram_data);
+	mfsdram(DDR0_20, sdram_data);
+	printf("        DDR0_20 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_21, sdram_data);
+	printf("        DDR0_21 = 0x%08X", sdram_data);
+	mfsdram(DDR0_22, sdram_data);
+	printf("        DDR0_22 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_23, sdram_data);
+	printf("        DDR0_23 = 0x%08X", sdram_data);
+	mfsdram(DDR0_24, sdram_data);
+	printf("        DDR0_24 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_25, sdram_data);
+	printf("        DDR0_25 = 0x%08X", sdram_data);
+	mfsdram(DDR0_26, sdram_data);
+	printf("        DDR0_26 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_27, sdram_data);
+	printf("        DDR0_27 = 0x%08X", sdram_data);
+	mfsdram(DDR0_28, sdram_data);
+	printf("        DDR0_28 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_31, sdram_data);
+	printf("        DDR0_31 = 0x%08X", sdram_data);
+	mfsdram(DDR0_32, sdram_data);
+	printf("        DDR0_32 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_33, sdram_data);
+	printf("        DDR0_33 = 0x%08X", sdram_data);
+	mfsdram(DDR0_34, sdram_data);
+	printf("        DDR0_34 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_35, sdram_data);
+	printf("        DDR0_35 = 0x%08X", sdram_data);
+	mfsdram(DDR0_36, sdram_data);
+	printf("        DDR0_36 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_37, sdram_data);
+	printf("        DDR0_37 = 0x%08X", sdram_data);
+	mfsdram(DDR0_38, sdram_data);
+	printf("        DDR0_38 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_39, sdram_data);
+	printf("        DDR0_39 = 0x%08X", sdram_data);
+	mfsdram(DDR0_40, sdram_data);
+	printf("        DDR0_40 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_41, sdram_data);
+	printf("        DDR0_41 = 0x%08X", sdram_data);
+	mfsdram(DDR0_42, sdram_data);
+	printf("        DDR0_42 = 0x%08X\n", sdram_data);
+	mfsdram(DDR0_43, sdram_data);
+	printf("        DDR0_43 = 0x%08X", sdram_data);
+	mfsdram(DDR0_44, sdram_data);
+	printf("        DDR0_44 = 0x%08X\n", sdram_data);
+}
+#else
+static inline void denali_sdram_register_dump(void)
+{
+}
+
+inline static void print_mcsr(void)
+{
+}
+#endif /* defined(DEBUG) */
+
+static int is_ecc_enabled(void)
+{
+	u32 val;
+
+	mfsdram(DDR0_22, val);
+	return 0x3 == DDR0_22_CTRL_RAW_DECODE(val);
+}
+
+static unsigned char spd_read(u8 chip, unsigned int addr)
+{
+	u8 data[2];
+
+	if (0 != i2c_probe(chip) || 0 != i2c_read(chip, addr, 1, data, 1)) {
+		debug("spd_read(0x%02X, 0x%02X) failed\n", chip, addr);
+		return 0;
+	}
+	debug("spd_read(0x%02X, 0x%02X) returned 0x%02X\n",
+	      chip, addr, data[0]);
+	return data[0];
+}
+
+static unsigned long get_tcyc(unsigned char reg)
+{
+	/*
+	 * Byte 9, et al: 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.
+	 */
+
+	unsigned char subfield_b = reg & 0x0F;
+
+	switch (subfield_b & 0x0F) {
+	case 0x0:
+	case 0x1:
+	case 0x2:
+	case 0x3:
+	case 0x4:
+	case 0x5:
+	case 0x6:
+	case 0x7:
+	case 0x8:
+	case 0x9:
+		return 1000 * (reg >> 4) + 100 * subfield_b;
+	case 0xA:
+		return 1000 * (reg >> 4) + 250;
+	case 0xB:
+		return 1000 * (reg >> 4) + 333;
+	case 0xC:
+		return 1000 * (reg >> 4) + 667;
+	case 0xD:
+		return 1000 * (reg >> 4) + 750;
+	}
+	return 0;
+}
+
+/*------------------------------------------------------------------
+ * Find the installed DIMMs, make sure that the are DDR2, and fill
+ * in the dimm_ranks array.  Then dimm_ranks[dimm_num] > 0 iff the
+ * DIMM and dimm_num is present.
+ * Note: Because there are only two chip-select lines, it is assumed
+ * that a board with a single socket can support two ranks on that
+ * socket, while a board with two sockets can support only one rank
+ * on each socket.
+ *-----------------------------------------------------------------*/
+static void get_spd_info(unsigned long dimm_ranks[],
+			 unsigned long *ranks,
+			 unsigned char const iic0_dimm_addr[],
+			 unsigned long num_dimm_banks)
+{
+	unsigned long dimm_num;
+	unsigned long dimm_found = FALSE;
+	unsigned long const max_ranks_per_dimm = (1 == num_dimm_banks) ? 2 : 1;
+	unsigned char num_of_bytes;
+	unsigned char total_size;
+
+	*ranks = 0;
+	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);
+		total_size = spd_read(iic0_dimm_addr[dimm_num], 1);
+		if ((num_of_bytes != 0) && (total_size != 0)) {
+			unsigned char const dimm_type =
+			    spd_read(iic0_dimm_addr[dimm_num], 2);
+
+			unsigned long ranks_on_dimm =
+			    (spd_read(iic0_dimm_addr[dimm_num], 5) & 0x07) + 1;
+
+			if (8 != dimm_type) {
+				switch (dimm_type) {
+				case 1:
+					printf("ERROR: Standard Fast Page Mode "
+					       "DRAM DIMM");
+					break;
+				case 2:
+					printf("ERROR: EDO DIMM");
+					break;
+				case 3:
+					printf("ERROR: Pipelined Nibble DIMM");
+					break;
+				case 4:
+					printf("ERROR: SDRAM DIMM");
+					break;
+				case 5:
+					printf("ERROR: Multiplexed ROM DIMM");
+					break;
+				case 6:
+					printf("ERROR: SGRAM DIMM");
+					break;
+				case 7:
+					printf("ERROR: DDR1 DIMM");
+					break;
+				default:
+					printf("ERROR: Unknown DIMM (type %d)",
+					       (unsigned int)dimm_type);
+					break;
+				}
+				printf(" detected in slot %lu.\n", dimm_num);
+				printf("Only DDR2 SDRAM DIMMs are supported."
+				       "\n");
+				printf("Replace the module with a DDR2 DIMM."
+				       "\n\n");
+				spd_ddr_init_hang();
+			}
+			dimm_found = TRUE;
+			debug("DIMM slot %lu: populated with %lu-rank DDR2 DIMM"
+			      "\n", dimm_num, ranks_on_dimm);
+			if (ranks_on_dimm > max_ranks_per_dimm) {
+				printf("WARNING: DRAM DIMM in slot %lu has %lu "
+				       "ranks.\n");
+				if (1 == max_ranks_per_dimm) {
+					printf("Only one rank will be used.\n");
+				} else {
+					printf
+					    ("Only two ranks will be used.\n");
+				}
+				ranks_on_dimm = max_ranks_per_dimm;
+			}
+			dimm_ranks[dimm_num] = ranks_on_dimm;
+			*ranks += ranks_on_dimm;
+		} else {
+			dimm_ranks[dimm_num] = 0;
+			debug("DIMM slot %lu: Not populated\n", dimm_num);
+		}
+	}
+	if (dimm_found == FALSE) {
+		printf("ERROR: No memory installed.\n");
+		printf("Install at least one DDR2 DIMM.\n\n");
+		spd_ddr_init_hang();
+	}
+	debug("Total number of ranks = %d\n", *ranks);
+}
+
+/*------------------------------------------------------------------
+ * For the memory DIMMs installed, this routine verifies that
+ * frequency previously calculated is supported.
+ *-----------------------------------------------------------------*/
+static void check_frequency(unsigned long *dimm_ranks,
+			    unsigned char const iic0_dimm_addr[],
+			    unsigned long num_dimm_banks,
+			    unsigned long sdram_freq)
+{
+	unsigned long dimm_num;
+	unsigned long cycle_time;
+	unsigned long calc_cycle_time;
+
+	/*
+	 * calc_cycle_time is calculated from DDR frequency set by board/chip
+	 * and is expressed in picoseconds to match the way DIMM cycle time is
+	 * calculated below.
+	 */
+	calc_cycle_time = MULDIV64(ONE_BILLION, 1000, sdram_freq);
+
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		if (dimm_ranks[dimm_num]) {
+			cycle_time =
+			    get_tcyc(spd_read(iic0_dimm_addr[dimm_num], 9));
+			debug("cycle_time=%d ps\n", cycle_time);
+
+			if (cycle_time > (calc_cycle_time + 10)) {
+				/*
+				 * the provided sdram cycle_time is too small
+				 * for the available DIMM cycle_time. The
+				 * additionnal 10ps 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,
+				     (unsigned int)dimm_num,
+				     (unsigned int)calc_cycle_time);
+				printf
+				    ("Replace the DIMM, or change DDR frequency via "
+				     "strapping bits.\n\n");
+				spd_ddr_init_hang();
+			}
+		}
+	}
+}
+
+/*------------------------------------------------------------------
+ * This routine gets size information for the installed memory
+ * DIMMs.
+ *-----------------------------------------------------------------*/
+static void get_dimm_size(unsigned long dimm_ranks[],
+			  unsigned char const iic0_dimm_addr[],
+			  unsigned long num_dimm_banks,
+			  unsigned long *const rows,
+			  unsigned long *const banks,
+			  unsigned long *const cols, unsigned long *const width)
+{
+	unsigned long dimm_num;
+
+	*rows = 0;
+	*banks = 0;
+	*cols = 0;
+	*width = 0;
+	for (dimm_num = 0; dimm_num < num_dimm_banks; dimm_num++) {
+		if (dimm_ranks[dimm_num]) {
+			unsigned long t;
+
+			/* Rows */
+			t = spd_read(iic0_dimm_addr[dimm_num], 3);
+			if (0 == *rows) {
+				*rows = t;
+			} else if (t != *rows) {
+				printf("ERROR: DRAM DIMM modules do not all "
+				       "have the same number of rows.\n\n");
+				spd_ddr_init_hang();
+			}
+			/* Banks */
+			t = spd_read(iic0_dimm_addr[dimm_num], 17);
+			if (0 == *banks) {
+				*banks = t;
+			} else if (t != *banks) {
+				printf("ERROR: DRAM DIMM modules do not all "
+				       "have the same number of banks.\n\n");
+				spd_ddr_init_hang();
+			}
+			/* Columns */
+			t = spd_read(iic0_dimm_addr[dimm_num], 4);
+			if (0 == *cols) {
+				*cols = t;
+			} else if (t != *cols) {
+				printf("ERROR: DRAM DIMM modules do not all "
+				       "have the same number of columns.\n\n");
+				spd_ddr_init_hang();
+			}
+			/* Data width */
+			t = spd_read(iic0_dimm_addr[dimm_num], 6);
+			if (0 == *width) {
+				*width = t;
+			} else if (t != *width) {
+				printf("ERROR: DRAM DIMM modules do not all "
+				       "have the same data width.\n\n");
+				spd_ddr_init_hang();
+			}
+		}
+	}
+	debug("Number of rows = %d\n", *rows);
+	debug("Number of columns = %d\n", *cols);
+	debug("Number of banks = %d\n", *banks);
+	debug("Data width = %d\n", *width);
+	if (*rows > 14) {
+		printf("ERROR: DRAM DIMM modules have %lu address rows.\n",
+		       *rows);
+		printf("Only modules with 14 or fewer rows are supported.\n\n");
+		spd_ddr_init_hang();
+	}
+	if (4 != *banks && 8 != *banks) {
+		printf("ERROR: DRAM DIMM modules have %lu banks.\n", *banks);
+		printf("Only modules with 4 or 8 banks are supported.\n\n");
+		spd_ddr_init_hang();
+	}
+	if (*cols > 12) {
+		printf("ERROR: DRAM DIMM modules have %lu address columns.\n",
+		       *cols);
+		printf("Only modules with 12 or fewer columns are "
+		       "supported.\n\n");
+		spd_ddr_init_hang();
+	}
+	if (32 != *width && 40 != *width && 64 != *width && 72 != *width) {
+		printf("ERROR: DRAM DIMM modules have a width of %lu bit.\n",
+		       *width);
+		printf("Only modules with widths of 32, 40, 64, and 72 bits "
+		       "are supported.\n\n");
+		spd_ddr_init_hang();
+	}
+}
+
+/*------------------------------------------------------------------
+ * Only 1.8V modules are supported.  This routine verifies this.
+ *-----------------------------------------------------------------*/
+static void check_voltage_type(unsigned long dimm_ranks[],
+			       unsigned char const 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_ranks[dimm_num]) {
+			voltage_type = spd_read(iic0_dimm_addr[dimm_num], 8);
+			if (0x05 != voltage_type) {	/* 1.8V for DDR2 */
+				printf("ERROR: Slot %lu provides 1.8V for DDR2 "
+				       "DIMMs.\n", dimm_num);
+				switch (voltage_type) {
+				case 0x00:
+					printf("This DIMM is 5.0 Volt/TTL.\n");
+					break;
+				case 0x01:
+					printf("This DIMM is LVTTL.\n");
+					break;
+				case 0x02:
+					printf("This DIMM is 1.5 Volt.\n");
+					break;
+				case 0x03:
+					printf("This DIMM is 3.3 Volt/TTL.\n");
+					break;
+				case 0x04:
+					printf("This DIMM is 2.5 Volt.\n");
+					break;
+				default:
+					printf("This DIMM is an unknown "
+					       "voltage.\n");
+					break;
+				}
+				printf("Replace it with a 1.8V DDR2 DIMM.\n\n");
+				spd_ddr_init_hang();
+			}
+		}
+	}
+}
+
+static void program_ddr0_03(unsigned long dimm_ranks[],
+			    unsigned char const iic0_dimm_addr[],
+			    unsigned long num_dimm_banks,
+			    unsigned long sdram_freq,
+			    unsigned long rows, unsigned long *cas_latency)
+{
+	unsigned long dimm_num;
+	unsigned long cas_index;
+	unsigned long cycle_2_0_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_ps = 100;
+	unsigned long max_3_0_tcyc_ps = 100;
+	unsigned long max_4_0_tcyc_ps = 100;
+	unsigned long max_5_0_tcyc_ps = 100;
+	unsigned char cas_available = 0x3C;	/* value for DDR2 */
+	u32 ddr0_03 = DDR0_03_BSTLEN_ENCODE(0x2) | DDR0_03_INITAREF_ENCODE(0x2);
+	unsigned int const tcyc_addr[3] = { 9, 23, 25 };
+
+	/*------------------------------------------------------------------
+	 * Get the board configuration info.
+	 *-----------------------------------------------------------------*/
+	debug("sdram_freq = %d\n", sdram_freq);
+
+	/*------------------------------------------------------------------
+	 * Handle the timing.  We need to find the worst case timing of all
+	 * the dimm modules installed.
+	 *-----------------------------------------------------------------*/
+	/* 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_ranks[dimm_num]) {
+			unsigned char const cas_bit =
+			    spd_read(iic0_dimm_addr[dimm_num], 18);
+			unsigned char cas_mask;
+
+			cas_available &= cas_bit;
+			for (cas_mask = 0x80; cas_mask; cas_mask >>= 1) {
+				if (cas_bit & cas_mask)
+					break;
+			}
+			debug("cas_bit (SPD byte 18) = %02X, cas_mask = %02X\n",
+			      cas_bit, cas_mask);
+
+			for (cas_index = 0; cas_index < 3;
+			     cas_mask >>= 1, cas_index++) {
+				unsigned long cycle_time_ps;
+
+				if (!(cas_available & cas_mask)) {
+					continue;
+				}
+				cycle_time_ps =
+				    get_tcyc(spd_read(iic0_dimm_addr[dimm_num],
+						      tcyc_addr[cas_index]));
+
+				debug("cas_index = %d: cycle_time_ps = %d\n",
+				      cas_index, cycle_time_ps);
+				/*
+				 * 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
+				 */
+				switch (cas_mask) {
+				case 0x20:
+					max_5_0_tcyc_ps =
+					    max(max_5_0_tcyc_ps, cycle_time_ps);
+					break;
+				case 0x10:
+					max_4_0_tcyc_ps =
+					    max(max_4_0_tcyc_ps, cycle_time_ps);
+					break;
+				case 0x08:
+					max_3_0_tcyc_ps =
+					    max(max_3_0_tcyc_ps, cycle_time_ps);
+					break;
+				case 0x04:
+					max_2_0_tcyc_ps =
+					    max(max_2_0_tcyc_ps, cycle_time_ps);
+					break;
+				}
+			}
+		}
+	}
+	debug("cas_available (bit map) = 0x%02X\n", cas_available);
+
+	/*------------------------------------------------------------------
+	 * Set the SDRAM mode, SDRAM_MMODE
+	 *-----------------------------------------------------------------*/
+
+	/* add 10 here because of rounding problems */
+	cycle_2_0_clk = MULDIV64(ONE_BILLION, 1000, max_2_0_tcyc_ps) + 10;
+	cycle_3_0_clk = MULDIV64(ONE_BILLION, 1000, max_3_0_tcyc_ps) + 10;
+	cycle_4_0_clk = MULDIV64(ONE_BILLION, 1000, max_4_0_tcyc_ps) + 10;
+	cycle_5_0_clk = MULDIV64(ONE_BILLION, 1000, max_5_0_tcyc_ps) + 10;
+	debug("cycle_2_0_clk = %d\n", cycle_2_0_clk);
+	debug("cycle_3_0_clk = %d\n", cycle_3_0_clk);
+	debug("cycle_4_0_clk = %d\n", cycle_4_0_clk);
+	debug("cycle_5_0_clk = %d\n", cycle_5_0_clk);
+
+	if ((cas_available & 0x04) && (sdram_freq <= cycle_2_0_clk)) {
+		*cas_latency = 2;
+		ddr0_03 |= DDR0_03_CASLAT_ENCODE(0x2) |
+		    DDR0_03_CASLAT_LIN_ENCODE(0x4);
+	} else if ((cas_available & 0x08) && (sdram_freq <= cycle_3_0_clk)) {
+		*cas_latency = 3;
+		ddr0_03 |= DDR0_03_CASLAT_ENCODE(0x3) |
+		    DDR0_03_CASLAT_LIN_ENCODE(0x6);
+	} else if ((cas_available & 0x10) && (sdram_freq <= cycle_4_0_clk)) {
+		*cas_latency = 4;
+		ddr0_03 |= DDR0_03_CASLAT_ENCODE(0x4) |
+		    DDR0_03_CASLAT_LIN_ENCODE(0x8);
+	} else if ((cas_available & 0x20) && (sdram_freq <= cycle_5_0_clk)) {
+		*cas_latency = 5;
+		ddr0_03 |= DDR0_03_CASLAT_ENCODE(0x5) |
+		    DDR0_03_CASLAT_LIN_ENCODE(0xA);
+	} else {
+		printf("ERROR: Cannot find a supported CAS latency with the "
+		       "installed DIMMs.\n");
+		printf("Only DDR2 DIMMs with CAS latencies of 2.0, 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");
+		printf("sdram_freq=%d cycle2=%d cycle3=%d cycle4=%d "
+		       "cycle5=%d\n\n", sdram_freq, cycle_2_0_clk,
+		       cycle_3_0_clk, cycle_4_0_clk, cycle_5_0_clk);
+		spd_ddr_init_hang();
+	}
+	debug("CAS latency = %d\n", *cas_latency);
+	mtsdram(DDR0_03, ddr0_03);
+}
+
+static void program_ddr0_04(unsigned long dimm_ranks[],
+			    unsigned char const iic0_dimm_addr[],
+			    unsigned long num_dimm_banks,
+			    unsigned long sdram_freq)
+{
+	unsigned long dimm_num;
+	unsigned long t_rc_ps = 0;
+	unsigned long t_rrd_ps = 0;
+	unsigned long t_rtp_ps = 0;
+	unsigned long t_rc_clk;
+	unsigned long t_rrd_clk;
+	unsigned long t_rtp_clk;
+
+	/*------------------------------------------------------------------
+	 * Handle the timing.  We need to find the worst case timing of all
+	 * the dimm modules installed.
+	 *-----------------------------------------------------------------*/
+	/* 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_ranks[dimm_num]) {
+			unsigned long ps;
+
+			/* tRC */
+			ps = 1000 * spd_read(iic0_dimm_addr[dimm_num], 41);
+			switch (spd_read(iic0_dimm_addr[dimm_num], 40) >> 4) {
+			case 0x1:
+				ps += 250;
+				break;
+			case 0x2:
+				ps += 333;
+				break;
+			case 0x3:
+				ps += 500;
+				break;
+			case 0x4:
+				ps += 667;
+				break;
+			case 0x5:
+				ps += 750;
+				break;
+			}
+			t_rc_ps = max(t_rc_ps, ps);
+			/* tRRD */
+			ps = 250 * spd_read(iic0_dimm_addr[dimm_num], 28);
+			t_rrd_ps = max(t_rrd_ps, ps);
+			/* tRTP */
+			ps = 250 * spd_read(iic0_dimm_addr[dimm_num], 38);
+			t_rtp_ps = max(t_rtp_ps, ps);
+		}
+	}
+	debug("t_rc_ps  = %d\n", t_rc_ps);
+	t_rc_clk = (MULDIV64(sdram_freq, t_rc_ps, ONE_BILLION) + 999) / 1000;
+	debug("t_rrd_ps = %d\n", t_rrd_ps);
+	t_rrd_clk = (MULDIV64(sdram_freq, t_rrd_ps, ONE_BILLION) + 999) / 1000;
+	debug("t_rtp_ps = %d\n", t_rtp_ps);
+	t_rtp_clk = (MULDIV64(sdram_freq, t_rtp_ps, ONE_BILLION) + 999) / 1000;
+	mtsdram(DDR0_04, DDR0_04_TRC_ENCODE(t_rc_clk) |
+		DDR0_04_TRRD_ENCODE(t_rrd_clk) |
+		DDR0_04_TRTP_ENCODE(t_rtp_clk));
+}
+
+static void program_ddr0_05(unsigned long dimm_ranks[],
+			    unsigned char const iic0_dimm_addr[],
+			    unsigned long num_dimm_banks,
+			    unsigned long sdram_freq)
+{
+	unsigned long dimm_num;
+	unsigned long t_rp_ps = 0;
+	unsigned long t_ras_ps = 0;
+	unsigned long t_rp_clk;
+	unsigned long t_ras_clk;
+	u32 ddr0_05 = DDR0_05_TMRD_ENCODE(0x2) | DDR0_05_TEMRS_ENCODE(0x2);
+
+	/*------------------------------------------------------------------
+	 * Handle the timing.  We need to find the worst case timing of all
+	 * the dimm modules installed.
+	 *-----------------------------------------------------------------*/
+	/* 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_ranks[dimm_num]) {
+			unsigned long ps;
+
+			/* tRP */
+			ps = 250 * spd_read(iic0_dimm_addr[dimm_num], 27);
+			t_rp_ps = max(t_rp_ps, ps);
+			/* tRAS */
+			ps = 1000 * spd_read(iic0_dimm_addr[dimm_num], 30);
+			t_ras_ps = max(t_ras_ps, ps);
+		}
+	}
+	debug("t_rp_ps  = %d\n", t_rp_ps);
+	t_rp_clk = (MULDIV64(sdram_freq, t_rp_ps, ONE_BILLION) + 999) / 1000;
+	debug("t_ras_ps = %d\n", t_ras_ps);
+	t_ras_clk = (MULDIV64(sdram_freq, t_ras_ps, ONE_BILLION) + 999) / 1000;
+	mtsdram(DDR0_05, ddr0_05 | DDR0_05_TRP_ENCODE(t_rp_clk) |
+		DDR0_05_TRAS_MIN_ENCODE(t_ras_clk));
+}
+
+static void program_ddr0_06(unsigned long dimm_ranks[],
+			    unsigned char const iic0_dimm_addr[],
+			    unsigned long num_dimm_banks,
+			    unsigned long sdram_freq)
+{
+	unsigned long dimm_num;
+	unsigned char spd_40;
+	unsigned long t_wtr_ps = 0;
+	unsigned long t_rfc_ps = 0;
+	unsigned long t_wtr_clk;
+	unsigned long t_rfc_clk;
+	u32 ddr0_06 =
+	    DDR0_06_WRITEINTERP_ENCODE(0x1) | DDR0_06_TDLL_ENCODE(200);
+
+	/*------------------------------------------------------------------
+	 * Handle the timing.  We need to find the worst case timing of all
+	 * the dimm modules installed.
+	 *-----------------------------------------------------------------*/
+	/* 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_ranks[dimm_num]) {
+			unsigned long ps;
+
+			/* tWTR */
+			ps = 250 * spd_read(iic0_dimm_addr[dimm_num], 37);
+			t_wtr_ps = max(t_wtr_ps, ps);
+			/* tRFC */
+			ps = 1000 * spd_read(iic0_dimm_addr[dimm_num], 42);
+			spd_40 = spd_read(iic0_dimm_addr[dimm_num], 40);
+			ps += 256000 * (spd_40 & 0x01);
+			switch ((spd_40 & 0x0E) >> 1) {
+			case 0x1:
+				ps += 250;
+				break;
+			case 0x2:
+				ps += 333;
+				break;
+			case 0x3:
+				ps += 500;
+				break;
+			case 0x4:
+				ps += 667;
+				break;
+			case 0x5:
+				ps += 750;
+				break;
+			}
+			t_rfc_ps = max(t_rfc_ps, ps);
+		}
+	}
+	debug("t_wtr_ps = %d\n", t_wtr_ps);
+	t_wtr_clk = (MULDIV64(sdram_freq, t_wtr_ps, ONE_BILLION) + 999) / 1000;
+	debug("t_rfc_ps = %d\n", t_rfc_ps);
+	t_rfc_clk = (MULDIV64(sdram_freq, t_rfc_ps, ONE_BILLION) + 999) / 1000;
+	mtsdram(DDR0_06, ddr0_06 | DDR0_06_TWTR_ENCODE(t_wtr_clk) |
+		DDR0_06_TRFC_ENCODE(t_rfc_clk));
+}
+
+static void program_ddr0_10(unsigned long dimm_ranks[], unsigned long ranks)
+{
+	unsigned long csmap;
+
+	if (2 == ranks) {
+		/* Both chip selects in use */
+		csmap = 0x03;
+	} else {
+		/* One chip select in use */
+		csmap = (1 == dimm_ranks[0]) ? 0x1 : 0x2;
+	}
+	mtsdram(DDR0_10, DDR0_10_WRITE_MODEREG_ENCODE(0x0) |
+		DDR0_10_CS_MAP_ENCODE(csmap) |
+		DDR0_10_OCD_ADJUST_PUP_CS_0_ENCODE(0));
+}
+
+static void program_ddr0_11(unsigned long sdram_freq)
+{
+	unsigned long const t_xsnr_ps = 200000;	/* 200 ns */
+	unsigned long t_xsnr_clk;
+
+	debug("t_xsnr_ps = %d\n", t_xsnr_ps);
+	t_xsnr_clk =
+	    (MULDIV64(sdram_freq, t_xsnr_ps, ONE_BILLION) + 999) / 1000;
+	mtsdram(DDR0_11, DDR0_11_SREFRESH_ENCODE(0) |
+		DDR0_11_TXSNR_ENCODE(t_xsnr_clk) | DDR0_11_TXSR_ENCODE(200));
+}
+
+static void program_ddr0_22(unsigned long dimm_ranks[],
+			    unsigned char const iic0_dimm_addr[],
+			    unsigned long num_dimm_banks, unsigned long width)
+{
+#if defined(CONFIG_DDR_ECC)
+	unsigned long dimm_num;
+	unsigned long ecc_available = width >= 64;
+	u32 ddr0_22 = DDR0_22_DQS_OUT_SHIFT_BYPASS_ENCODE(0x26) |
+	    DDR0_22_DQS_OUT_SHIFT_ENCODE(DQS_OUT_SHIFT) |
+	    DDR0_22_DLL_DQS_BYPASS_8_ENCODE(DLL_DQS_BYPASS);
+
+	/* 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_ranks[dimm_num]) {
+			/* Check for ECC */
+			if (0 == (spd_read(iic0_dimm_addr[dimm_num], 11) &
+				  0x02)) {
+				ecc_available = FALSE;
+			}
+		}
+	}
+	if (ecc_available) {
+		debug("ECC found on all DIMMs present\n");
+		mtsdram(DDR0_22, ddr0_22 | DDR0_22_CTRL_RAW_ENCODE(0x3));
+	} else {
+		debug("ECC not found on some or all DIMMs present\n");
+		mtsdram(DDR0_22, ddr0_22 | DDR0_22_CTRL_RAW_ENCODE(0x0));
+	}
+#else
+	mtsdram(DDR0_22, DDR0_22_CTRL_RAW_ENCODE(0x0) |
+		DDR0_22_DQS_OUT_SHIFT_BYPASS_ENCODE(0x26) |
+		DDR0_22_DQS_OUT_SHIFT_ENCODE(DQS_OUT_SHIFT) |
+		DDR0_22_DLL_DQS_BYPASS_8_ENCODE(DLL_DQS_BYPASS));
+#endif /* defined(CONFIG_DDR_ECC) */
+}
+
+static void program_ddr0_24(unsigned long ranks)
+{
+	u32 ddr0_24 = DDR0_24_RTT_PAD_TERMINATION_ENCODE(0x1) |	/* 75 ohm */
+	    DDR0_24_ODT_RD_MAP_CS1_ENCODE(0x0);
+
+	if (2 == ranks) {
+		/* Both chip selects in use */
+		ddr0_24 |= DDR0_24_ODT_WR_MAP_CS1_ENCODE(0x1) |
+		    DDR0_24_ODT_WR_MAP_CS0_ENCODE(0x2);
+	} else {
+		/* One chip select in use */
+		/* One of the two fields added to ddr0_24 is a "don't care" */
+		ddr0_24 |= DDR0_24_ODT_WR_MAP_CS1_ENCODE(0x2) |
+		    DDR0_24_ODT_WR_MAP_CS0_ENCODE(0x1);
+	}
+	mtsdram(DDR0_24, ddr0_24);
+}
+
+static void program_ddr0_26(unsigned long sdram_freq)
+{
+	unsigned long const t_ref_ps = 7800000;	/* 7.8 us. refresh */
+	/* TODO: check definition of tRAS_MAX */
+	unsigned long const t_ras_max_ps = 9 * t_ref_ps;
+	unsigned long t_ras_max_clk;
+	unsigned long t_ref_clk;
+
+	/* Round down t_ras_max_clk and t_ref_clk */
+	debug("t_ras_max_ps = %d\n", t_ras_max_ps);
+	t_ras_max_clk = MULDIV64(sdram_freq, t_ras_max_ps, ONE_BILLION) / 1000;
+	debug("t_ref_ps     = %d\n", t_ref_ps);
+	t_ref_clk = MULDIV64(sdram_freq, t_ref_ps, ONE_BILLION) / 1000;
+	mtsdram(DDR0_26, DDR0_26_TRAS_MAX_ENCODE(t_ras_max_clk) |
+		DDR0_26_TREF_ENCODE(t_ref_clk));
+}
+
+static void program_ddr0_27(unsigned long sdram_freq)
+{
+	unsigned long const t_init_ps = 200000000;	/* 200 us. init */
+	unsigned long t_init_clk;
+
+	debug("t_init_ps = %d\n", t_init_ps);
+	t_init_clk =
+	    (MULDIV64(sdram_freq, t_init_ps, ONE_BILLION) + 999) / 1000;
+	mtsdram(DDR0_27, DDR0_27_EMRS_DATA_ENCODE(0x0000) |
+		DDR0_27_TINIT_ENCODE(t_init_clk));
+}
+
+static void program_ddr0_43(unsigned long dimm_ranks[],
+			    unsigned char const iic0_dimm_addr[],
+			    unsigned long num_dimm_banks,
+			    unsigned long sdram_freq,
+			    unsigned long cols, unsigned long banks)
+{
+	unsigned long dimm_num;
+	unsigned long t_wr_ps = 0;
+	unsigned long t_wr_clk;
+	u32 ddr0_43 = DDR0_43_APREBIT_ENCODE(10) |
+	    DDR0_43_COLUMN_SIZE_ENCODE(12 - cols) |
+	    DDR0_43_EIGHT_BANK_MODE_ENCODE(8 == banks ? 1 : 0);
+
+	/*------------------------------------------------------------------
+	 * Handle the timing.  We need to find the worst case timing of all
+	 * the dimm modules installed.
+	 *-----------------------------------------------------------------*/
+	/* 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_ranks[dimm_num]) {
+			unsigned long ps;
+
+			ps = 250 * spd_read(iic0_dimm_addr[dimm_num], 36);
+			t_wr_ps = max(t_wr_ps, ps);
+		}
+	}
+	debug("t_wr_ps = %d\n", t_wr_ps);
+	t_wr_clk = (MULDIV64(sdram_freq, t_wr_ps, ONE_BILLION) + 999) / 1000;
+	mtsdram(DDR0_43, ddr0_43 | DDR0_43_TWR_ENCODE(t_wr_clk));
+}
+
+static void program_ddr0_44(unsigned long dimm_ranks[],
+			    unsigned char const iic0_dimm_addr[],
+			    unsigned long num_dimm_banks,
+			    unsigned long sdram_freq)
+{
+	unsigned long dimm_num;
+	unsigned long t_rcd_ps = 0;
+	unsigned long t_rcd_clk;
+
+	/*------------------------------------------------------------------
+	 * Handle the timing.  We need to find the worst case timing of all
+	 * the dimm modules installed.
+	 *-----------------------------------------------------------------*/
+	/* 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_ranks[dimm_num]) {
+			unsigned long ps;
+
+			ps = 250 * spd_read(iic0_dimm_addr[dimm_num], 29);
+			t_rcd_ps = max(t_rcd_ps, ps);
+		}
+	}
+	debug("t_rcd_ps = %d\n", t_rcd_ps);
+	t_rcd_clk = (MULDIV64(sdram_freq, t_rcd_ps, ONE_BILLION) + 999) / 1000;
+	mtsdram(DDR0_44, DDR0_44_TRCD_ENCODE(t_rcd_clk));
+}
+
+/*-----------------------------------------------------------------------------+
+ * initdram.  Initializes the 440EPx/GPx 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 const iic0_dimm_addr[] = SPD_EEPROM_ADDRESS;
+	unsigned long dimm_ranks[MAXDIMMS];
+	unsigned long ranks;
+	unsigned long rows;
+	unsigned long banks;
+	unsigned long cols;
+	unsigned long width;
+	unsigned long const sdram_freq = get_bus_freq(0);
+	unsigned long const num_dimm_banks = sizeof(iic0_dimm_addr);	/* on board dimm banks */
+	unsigned long cas_latency = 0;	/* to quiet initialization warning */
+	unsigned long dram_size;
+
+	debug("\nEntering initdram()\n");
+
+	/*------------------------------------------------------------------
+	 * Stop the DDR-SDRAM controller.
+	 *-----------------------------------------------------------------*/
+	mtsdram(DDR0_02, DDR0_02_START_ENCODE(0));
+
+	/*
+	 * 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_ranks, &ranks, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Check the frequency supported for the dimms plugged.
+	 *-----------------------------------------------------------------*/
+	check_frequency(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq);
+
+	/*------------------------------------------------------------------
+	 * Check and get size information.
+	 *-----------------------------------------------------------------*/
+	get_dimm_size(dimm_ranks, iic0_dimm_addr, num_dimm_banks, &rows, &banks,
+		      &cols, &width);
+
+	/*------------------------------------------------------------------
+	 * Check the voltage type for the dimms plugged.
+	 *-----------------------------------------------------------------*/
+	check_voltage_type(dimm_ranks, iic0_dimm_addr, num_dimm_banks);
+
+	/*------------------------------------------------------------------
+	 * Program registers for SDRAM controller.
+	 *-----------------------------------------------------------------*/
+	mtsdram(DDR0_00, DDR0_00_DLL_INCREMENT_ENCODE(0x19) |
+		DDR0_00_DLL_START_POINT_DECODE(0x0A));
+
+	mtsdram(DDR0_01, DDR0_01_PLB0_DB_CS_LOWER_ENCODE(0x01) |
+		DDR0_01_PLB0_DB_CS_UPPER_ENCODE(0x00) |
+		DDR0_01_INT_MASK_ENCODE(0xFF));
+
+	program_ddr0_03(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq,
+			rows, &cas_latency);
+
+	program_ddr0_04(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq);
+
+	program_ddr0_05(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq);
+
+	program_ddr0_06(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq);
+
+	/*------------------------------------------------------------------
+	 * TODO: tFAW not found in SPD.  Value of 13 taken from Sequoia
+	 * board SDRAM, but may be overly concervate.
+	 *-----------------------------------------------------------------*/
+	mtsdram(DDR0_07, DDR0_07_NO_CMD_INIT_ENCODE(0) |
+		DDR0_07_TFAW_ENCODE(13) |
+		DDR0_07_AUTO_REFRESH_MODE_ENCODE(1) |
+		DDR0_07_AREFRESH_ENCODE(0));
+
+	mtsdram(DDR0_08, DDR0_08_WRLAT_ENCODE(cas_latency - 1) |
+		DDR0_08_TCPD_ENCODE(200) | DDR0_08_DQS_N_EN_ENCODE(0) |
+		DDR0_08_DDRII_ENCODE(1));
+
+	mtsdram(DDR0_09, DDR0_09_OCD_ADJUST_PDN_CS_0_ENCODE(0x00) |
+		DDR0_09_RTT_0_ENCODE(0x1) |
+		DDR0_09_WR_DQS_SHIFT_BYPASS_ENCODE(0x1D) |
+		DDR0_09_WR_DQS_SHIFT_ENCODE(DQS_OUT_SHIFT - 0x20));
+
+	program_ddr0_10(dimm_ranks, ranks);
+
+	program_ddr0_11(sdram_freq);
+
+	mtsdram(DDR0_12, DDR0_12_TCKE_ENCODE(3));
+
+	mtsdram(DDR0_14, DDR0_14_DLL_BYPASS_MODE_ENCODE(0) |
+		DDR0_14_REDUC_ENCODE(width <= 40 ? 1 : 0) |
+		DDR0_14_REG_DIMM_ENABLE_ENCODE(0));
+
+	mtsdram(DDR0_17, DDR0_17_DLL_DQS_DELAY_0_ENCODE(DLL_DQS_DELAY));
+
+	mtsdram(DDR0_18, DDR0_18_DLL_DQS_DELAY_4_ENCODE(DLL_DQS_DELAY) |
+		DDR0_18_DLL_DQS_DELAY_3_ENCODE(DLL_DQS_DELAY) |
+		DDR0_18_DLL_DQS_DELAY_2_ENCODE(DLL_DQS_DELAY) |
+		DDR0_18_DLL_DQS_DELAY_1_ENCODE(DLL_DQS_DELAY));
+
+	mtsdram(DDR0_19, DDR0_19_DLL_DQS_DELAY_8_ENCODE(DLL_DQS_DELAY) |
+		DDR0_19_DLL_DQS_DELAY_7_ENCODE(DLL_DQS_DELAY) |
+		DDR0_19_DLL_DQS_DELAY_6_ENCODE(DLL_DQS_DELAY) |
+		DDR0_19_DLL_DQS_DELAY_5_ENCODE(DLL_DQS_DELAY));
+
+	mtsdram(DDR0_20, DDR0_20_DLL_DQS_BYPASS_3_ENCODE(DLL_DQS_BYPASS) |
+		DDR0_20_DLL_DQS_BYPASS_2_ENCODE(DLL_DQS_BYPASS) |
+		DDR0_20_DLL_DQS_BYPASS_1_ENCODE(DLL_DQS_BYPASS) |
+		DDR0_20_DLL_DQS_BYPASS_0_ENCODE(DLL_DQS_BYPASS));
+
+	mtsdram(DDR0_21, DDR0_21_DLL_DQS_BYPASS_7_ENCODE(DLL_DQS_BYPASS) |
+		DDR0_21_DLL_DQS_BYPASS_6_ENCODE(DLL_DQS_BYPASS) |
+		DDR0_21_DLL_DQS_BYPASS_5_ENCODE(DLL_DQS_BYPASS) |
+		DDR0_21_DLL_DQS_BYPASS_4_ENCODE(DLL_DQS_BYPASS));
+
+	program_ddr0_22(dimm_ranks, iic0_dimm_addr, num_dimm_banks, width);
+
+	mtsdram(DDR0_23, DDR0_23_ODT_RD_MAP_CS0_ENCODE(0x0) |
+		DDR0_23_FWC_ENCODE(0));
+
+	program_ddr0_24(ranks);
+
+	program_ddr0_26(sdram_freq);
+
+	program_ddr0_27(sdram_freq);
+
+	mtsdram(DDR0_28, DDR0_28_EMRS3_DATA_ENCODE(0x0000) |
+		DDR0_28_EMRS2_DATA_ENCODE(0x0000));
+
+	mtsdram(DDR0_31, DDR0_31_XOR_CHECK_BITS_ENCODE(0x0000));
+
+	mtsdram(DDR0_42, DDR0_42_ADDR_PINS_DECODE(14 - rows) |
+		DDR0_42_CASLAT_LIN_GATE_ENCODE(2 * cas_latency));
+
+	program_ddr0_43(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq,
+			cols, banks);
+
+	program_ddr0_44(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq);
+
+	denali_sdram_register_dump();
+
+	dram_size = (width >= 64) ? 8 : 4;
+	dram_size *= 1 << cols;
+	dram_size *= banks;
+	dram_size *= 1 << rows;
+	dram_size *= ranks;
+	debug("dram_size = %lu\n", dram_size);
+
+	/* Start the SDRAM controler */
+	mtsdram(DDR0_02, DDR0_02_START_ENCODE(1));
+	denali_wait_for_dlllock();
+
+#if defined(CONFIG_DDR_DATA_EYE)
+	/* -----------------------------------------------------------+
+	 * Perform data eye search if requested.
+	 * ----------------------------------------------------------*/
+	program_tlb(0, CFG_SDRAM_BASE, dram_size, TLB_WORD2_I_ENABLE);
+	denali_core_search_data_eye();
+	denali_sdram_register_dump();
+	remove_tlb(CFG_SDRAM_BASE, dram_size);
+#endif
+
+#if defined(CONFIG_ZERO_SDRAM) || defined(CONFIG_DDR_ECC)
+	program_tlb(0, CFG_SDRAM_BASE, dram_size, 0);
+	sync();
+	eieio();
+	/* Zero the memory */
+	debug("Zeroing SDRAM...");
+	dcbz_area(CFG_SDRAM_BASE, dram_size);
+	dflush();
+	debug("Completed\n");
+	sync();
+	eieio();
+	remove_tlb(CFG_SDRAM_BASE, dram_size);
+
+#if defined(CONFIG_DDR_ECC)
+	/*
+	 * If ECC is enabled, clear and enable interrupts
+	 */
+	if (is_ecc_enabled()) {
+		u32 val;
+
+		sync();
+		eieio();
+		/* Clear error status */
+		mfsdram(DDR0_00, val);
+		mtsdram(DDR0_00, val | DDR0_00_INT_ACK_ALL);
+		/* Set 'int_mask' parameter to functionnal value */
+		mfsdram(DDR0_01, val);
+		mtsdram(DDR0_01, (val & ~DDR0_01_INT_MASK_MASK) |
+			DDR0_01_INT_MASK_ALL_OFF);
+#if defined(CONFIG_DDR_DATA_EYE)
+		/*
+		 * Running denali_core_search_data_eye() when ECC is enabled
+		 * causes non-ECC machine checks.  This clears them.
+		 */
+		print_mcsr();
+		mtspr(SPRN_MCSR, mfspr(SPRN_MCSR));
+		print_mcsr();
+#endif
+		sync();
+		eieio();
+	}
+#endif /* defined(CONFIG_DDR_ECC) */
+#endif /* defined(CONFIG_ZERO_SDRAM) || defined(CONFIG_DDR_ECC) */
+
+	program_tlb(0, CFG_SDRAM_BASE, dram_size, MY_TLB_WORD2_I_ENABLE);
+	return dram_size;
+}
+
+void board_add_ram_info(int use_default)
+{
+	u32 val;
+
+	printf(" (ECC");
+	if (!is_ecc_enabled()) {
+		printf(" not");
+	}
+	printf(" enabled, %d MHz", (2 * get_bus_freq(0)) / 1000000);
+
+	mfsdram(DDR0_03, val);
+	printf(", CL%d)", DDR0_03_CASLAT_LIN_DECODE(val) >> 1);
+}
+#endif /* CONFIG_SPD_EEPROM */