board/etx094/etx094.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2000
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * 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
  */

 #include <common.h>
 #include <mpc8xx.h>

 /* ------------------------------------------------------------------------- */

 static long int dram_size (long int, long int *, long int);
 static void read_hw_vers (void);

 /* ------------------------------------------------------------------------- */

 #define _NOT_USED_	0xFFFFFFFF

 const uint sdram_table[] = {

 	/* single read   (offset 0x00 in upm ram) */

 	0xEECEFC24, 0x100DFC24, 0xE02FBC04, 0x01AA7C04,
 	0x1FB5FC00, 0xFFFFFC05, _NOT_USED_, _NOT_USED_,

 	/* burst read    (offset 0x08 in upm ram) */

 	0xEECEFC24, 0x100DFC24, 0xE0FFBC04, 0x10FF7C04,
 	0xF0FFFC00, 0xF0FFFC00, 0xF0FFFC00, 0xFFFFFC00,
 	0xFFFFFC05, _NOT_USED_, _NOT_USED_, _NOT_USED_,
 	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

 	/* single write  (offset 0x18 in upm ram) */

 	0xEECEFC24, 0x100DFC24, 0xE02BBC04, 0x01A27C00,
 	0xEFAAFC04, 0x1FB5FC05, _NOT_USED_, _NOT_USED_,

 	/* burst write   (offset 0x20 in upm ram) */

 	0xEECEFC24, 0x103DFC24, 0xE0FBBC00, 0x10F77C00,
 	0xF0FFFC00, 0xF0FFFC00, 0xF0FFFC04, 0xFFFFFC05,

 	/* init part1      (offset 0x28 in upm ram) */

 	0xEFFAFC3C, 0x1FF4FC34, 0xEFFCBC34, 0x1FFC3C34,
 	0xFFFC3C35, _NOT_USED_, _NOT_USED_, _NOT_USED_,

 	/* refresh   (offset 0x30 in upm ram) */

 	0xEFFEBC0C, 0x1FFD7C04, 0xFFFFFC04, 0xFFFFFC05,

 	/* init part2     (offset 0x34 in upm ram) */

 	0xFFFEBC04, 0xEFFC3CB4, 0x1FFC3C34, 0xFFFC3C34,
 	0xFFFC3C34, 0xEFE83CB4, 0x1FB57C35, _NOT_USED_,

 	/* exception     (offset 0x3C in upm ram) */

 	0xFFFFFC05, _NOT_USED_, _NOT_USED_, _NOT_USED_,

 };

 /* ------------------------------------------------------------------------- */


 /*
  * Check Board Identity:
  *
  * Test ETX ID string (ETX_xxx...)
  *
  * Return 1 always.
  */

 int checkboard (void)
 {
 	DECLARE_GLOBAL_DATA_PTR;

 	unsigned char *s = getenv ("serial#");
 	unsigned char *e;

 	puts ("Board: ");

 #ifdef SB_ETX094
 	gd->board_type = 0; /* 0 = 2SDRAM-Device */
 #else
 	gd->board_type = 1; /* 1 = 1SDRAM-Device */
 #endif

 	if (!s || strncmp (s, "ETX_", 4)) {
 		puts ("### No HW ID - assuming ETX_094\n");
 		read_hw_vers ();
 		return (0);
 	}

 	for (e = s; *e; ++e) {
 		if (*e == ' ')
 			break;
 	}

 	for (; s < e; ++s) {
 		putc (*s);
 	}
 	putc ('\n');

 	read_hw_vers ();
 	return (0);
 }

 /* ------------------------------------------------------------------------- */

 long int initdram (int board_type)
 {
 	volatile immap_t *immap = (immap_t *) CFG_IMMR;
 	volatile memctl8xx_t *memctl = &immap->im_memctl;
 	long int size_b0, size_b1, size8, size9;

 	upmconfig (UPMA, (uint *) sdram_table,
 			   sizeof (sdram_table) / sizeof (uint));

 	/*
 	 * Preliminary prescaler for refresh (depends on number of
 	 * banks): This value is selected for four cycles every 62.4 us
 	 * with two SDRAM banks or four cycles every 31.2 us with one
 	 * bank. It will be adjusted after memory sizing.
 	 */
 	memctl->memc_mptpr = CFG_MPTPR_1BK_4K;	/* MPTPR_PTP_DIV32 0x0200 */

 	/* A3(SDRAM)=0      => Bursttype = Sequential
 	 * A2-A0(SDRAM)=010 => Burst length = 4
 	 * A4-A6(SDRAM)=010 => CasLat=2
 	 */
 	memctl->memc_mar = 0x00000088;

 	/*
 	 * Map controller banks 2 and 3 to the SDRAM banks 2 and 3 at
 	 * preliminary addresses - these have to be modified after the
 	 * SDRAM size has been determined.
 	 */
 	memctl->memc_or2 = CFG_OR2_PRELIM;
 	memctl->memc_br2 = CFG_BR2_PRELIM;

 	if (board_type == 0) {	/* "L" type boards have only one bank SDRAM */
 		memctl->memc_or3 = CFG_OR3_PRELIM;
 		memctl->memc_br3 = CFG_BR3_PRELIM;
 	}

 	memctl->memc_mamr = CFG_MAMR_8COL & (~(MAMR_PTAE));	/* no refresh yet */

 	udelay (200);

 	/* perform SDRAM initializsation sequence */

 	memctl->memc_mcr = 0x80004128;	/* SDRAM bank 0 (CS2) - Init Part 1 */
 	memctl->memc_mcr = 0x80004734;	/* SDRAM bank 0 (CS2) - Init Part 2 */
 	udelay (1);

 	if (board_type == 0) {		/* "L" type boards have only one bank SDRAM */
 		memctl->memc_mcr = 0x80006128;	/* SDRAM bank 1 (CS3) - Init Part 1 */
 		memctl->memc_mcr = 0x80006734;	/* SDRAM bank 1 (CS3) - Init Part 2 */
 		udelay (1);
 	}

 	memctl->memc_mamr |= MAMR_PTAE;	/* enable refresh */

 	udelay (1000);

 	/*
 	 * Check Bank 0 Memory Size for re-configuration
 	 *
 	 * try 8 column mode
 	 */
 	size8 = dram_size (CFG_MAMR_8COL, (ulong *) SDRAM_BASE2_PRELIM,
 					   SDRAM_MAX_SIZE);

 	udelay (1000);

 	/*
 	 * try 9 column mode
 	 */
 	size9 = dram_size (CFG_MAMR_9COL, (ulong *) SDRAM_BASE2_PRELIM,
 					   SDRAM_MAX_SIZE);

 	if (size8 < size9) {		/* leave configuration at 9 columns */
 		size_b0 = size9;
 /*	debug ("SDRAM Bank 0 in 9 column mode: %ld MB\n", size >> 20);	*/
 	} else {					/* back to 8 columns            */
 		size_b0 = size8;
 		memctl->memc_mamr = CFG_MAMR_8COL;
 		udelay (500);
 /*	debug ("SDRAM Bank 0 in 8 column mode: %ld MB\n", size >> 20);	*/
 	}

 	if (board_type == 0) {		/* "L" type boards have only one bank SDRAM */
 		/*
 		 * Check Bank 1 Memory Size
 		 * use current column settings
 		 * [9 column SDRAM may also be used in 8 column mode,
 		 *  but then only half the real size will be used.]
 		 */
 		size_b1 =
 				dram_size (memctl->memc_mamr, (ulong *) SDRAM_BASE3_PRELIM,
 						   SDRAM_MAX_SIZE);
 /*	debug ("SDRAM Bank 1: %ld MB\n", size8 >> 20);	*/
 	} else {
 		size_b1 = 0;
 	}

 	udelay (1000);

 	/*
 	 * Adjust refresh rate depending on SDRAM type, both banks
 	 * For types > 128 MBit leave it at the current (fast) rate
 	 */
 	if ((size_b0 < 0x02000000) && (size_b1 < 0x02000000)) {
 		/* reduce to 15.6 us (62.4 us / quad) */
 		memctl->memc_mptpr = CFG_MPTPR_2BK_4K;	/*DIV16 */
 		udelay (1000);
 	}

 	/*
 	 * Final mapping: map bigger bank first
 	 */
 	if (size_b1 > size_b0) {	/* SDRAM Bank 1 is bigger - map first   */

 		memctl->memc_or3 = ((-size_b1) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
 		memctl->memc_br3 =
 			(CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;

 		if (size_b0 > 0) {
 			/*
 			 * Position Bank 0 immediately above Bank 1
 			 */
 			memctl->memc_or2 =
 				((-size_b0) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
 			memctl->memc_br2 =
 				((CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V)
 				+ size_b1;
 		} else {
 			unsigned long reg;

 			/*
 			 * No bank 0
 			 *
 			 * invalidate bank
 			 */
 			memctl->memc_br2 = 0;

 			/* adjust refresh rate depending on SDRAM type, one bank */
 			reg = memctl->memc_mptpr;
 			reg >>= 1;	/* reduce to CFG_MPTPR_1BK_8K / _4K */
 			memctl->memc_mptpr = reg;
 		}

 	} else {			/* SDRAM Bank 0 is bigger - map first   */

 		memctl->memc_or2 = ((-size_b0) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
 		memctl->memc_br2 =
 				(CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;

 		if (size_b1 > 0) {
 			/*
 			 * Position Bank 1 immediately above Bank 0
 			 */
 			memctl->memc_or3 =
 					((-size_b1) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
 			memctl->memc_br3 =
 					((CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V)
 					+ size_b0;
 		} else {
 			unsigned long reg;

 			/*
 			 * No bank 1
 			 *
 			 * invalidate bank
 			 */
 			memctl->memc_br3 = 0;

 			/* adjust refresh rate depending on SDRAM type, one bank */
 			reg = memctl->memc_mptpr;
 			reg >>= 1;	/* reduce to CFG_MPTPR_1BK_8K / _4K */
 			memctl->memc_mptpr = reg;
 		}
 	}

 	udelay (10000);

 	return (size_b0 + size_b1);
 }

 /* ------------------------------------------------------------------------- */

 /*
  * Check memory range for valid RAM. A simple memory test determines
  * the actually available RAM size between addresses `base' and
  * `base + maxsize'. Some (not all) hardware errors are detected:
  * - short between address lines
  * - short between data lines
  */

 static long int dram_size (long int mamr_value, long int *base,
 						   long int maxsize)
 {
 	volatile immap_t *immap = (immap_t *) CFG_IMMR;
 	volatile memctl8xx_t *memctl = &immap->im_memctl;
 	volatile long int *addr;
  	ulong cnt, val, size;
  	ulong save[32];			/* to make test non-destructive */
 	unsigned char i = 0;

 	memctl->memc_mamr = mamr_value;

 	for (cnt = maxsize / sizeof (long); cnt > 0; cnt >>= 1) {
 		addr = base + cnt;	/* pointer arith! */

 		save[i++] = *addr;
 		*addr = ~cnt;
 	}

 	/* write 0 to base address */
 	addr = base;
 	save[i] = *addr;
 	*addr = 0;

 	/* check at base address */
 	if ((val = *addr) != 0) {
 		/* Restore the original data before leaving the function.
 		 */
 		*addr = save[i];
 		for (cnt = 1; cnt <= maxsize / sizeof(long); cnt <<= 1) {
 			addr  = (volatile ulong *) base + cnt;
 			*addr = save[--i];
 		}
 		return (0);
 	}

 	for (cnt = 1; cnt <= maxsize / sizeof (long); cnt <<= 1) {
 		addr = base + cnt;	/* pointer arith! */

 		val = *addr;
 		*addr = save[--i];

 		if (val != (~cnt)) {
 			size = cnt * sizeof (long);
 			/* Restore the original data before returning
 			 */
 			for (cnt <<= 1; cnt <= maxsize / sizeof (long); cnt <<= 1) {
 				addr  = (volatile ulong *) base + cnt;
 				*addr = save[--i];
 			}
 			return (size);
 		}
 	}
 	return (maxsize);
 }

 /* ------------------------------------------------------------------------- */

 /* HW-ID Table (Bits: 2^9;2^7;2^5) */
 #define HW_ID_0 0x0000
 #define HW_ID_1 0x0020
 #define HW_ID_2 0x0080
 #define HW_ID_3 0x00a0
 #define HW_ID_4 0x0200
 #define HW_ID_5 0x0220
 #define HW_ID_6 0x0280
 #define HW_ID_7 0x02a0

 void read_hw_vers ()
 {
 	unsigned short rd_msk = 0x02A0;

 	/* HW-ID pin-definition */
 	volatile immap_t *immr = (immap_t *) CFG_IMMR;

 	immr->im_ioport.iop_pddir &= ~(rd_msk);
 	immr->im_ioport.iop_pdpar &= ~(rd_msk);

 	/* debug printf("State of PD: %x\n",immr->im_ioport.iop_pddat); */

 	/* Check the HW-ID */
 	printf ("HW-Version: ");
 	switch (immr->im_ioport.iop_pddat & rd_msk) {
 	case HW_ID_0:
 		printf ("V0.1 - V0.3 / W97238-Q3162-A1-1-2\n");
 		break;
 	case HW_ID_1:
 		printf ("V0.9 / W50037-Q1-D6-1\n");
 		break;
 	case HW_ID_2:
 		printf ("NOT USED - assuming ID#2\n");
 		break;
 	case HW_ID_3:
 		printf ("NOT USED - assuming ID#3\n");
 		break;
 	case HW_ID_4:
 		printf ("NOT USED - assuming ID#4\n");
 		break;
 	case HW_ID_5:
 		printf ("NOT USED - assuming ID#5\n");
 		break;
 	case HW_ID_6:
 		printf ("NOT USED - assuming ID#6\n");
 		break;
 	case HW_ID_7:
 		printf ("NOT USED - assuming ID#7\n");
 		break;
 	default:
 		printf ("###Error###\n");
 		break;
 	}
 }

 /* ------------------------------------------------------------------------- */
	/*
	* (C) Copyright 2000
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* 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
	*/

	#include <common.h>
	#include <mpc8xx.h>

	/* ------------------------------------------------------------------------- */

	static long int dram_size (long int, long int *, long int);
	static void read_hw_vers (void);

	/* ------------------------------------------------------------------------- */

	#define _NOT_USED_ 0xFFFFFFFF

	const uint sdram_table[] = {

	/* single read (offset 0x00 in upm ram) */

	0xEECEFC24, 0x100DFC24, 0xE02FBC04, 0x01AA7C04,
	0x1FB5FC00, 0xFFFFFC05, _NOT_USED_, _NOT_USED_,

	/* burst read (offset 0x08 in upm ram) */

	0xEECEFC24, 0x100DFC24, 0xE0FFBC04, 0x10FF7C04,
	0xF0FFFC00, 0xF0FFFC00, 0xF0FFFC00, 0xFFFFFC00,
	0xFFFFFC05, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,

	/* single write (offset 0x18 in upm ram) */

	0xEECEFC24, 0x100DFC24, 0xE02BBC04, 0x01A27C00,
	0xEFAAFC04, 0x1FB5FC05, _NOT_USED_, _NOT_USED_,

	/* burst write (offset 0x20 in upm ram) */

	0xEECEFC24, 0x103DFC24, 0xE0FBBC00, 0x10F77C00,
	0xF0FFFC00, 0xF0FFFC00, 0xF0FFFC04, 0xFFFFFC05,

	/* init part1 (offset 0x28 in upm ram) */

	0xEFFAFC3C, 0x1FF4FC34, 0xEFFCBC34, 0x1FFC3C34,
	0xFFFC3C35, _NOT_USED_, _NOT_USED_, _NOT_USED_,

	/* refresh (offset 0x30 in upm ram) */

	0xEFFEBC0C, 0x1FFD7C04, 0xFFFFFC04, 0xFFFFFC05,

	/* init part2 (offset 0x34 in upm ram) */

	0xFFFEBC04, 0xEFFC3CB4, 0x1FFC3C34, 0xFFFC3C34,
	0xFFFC3C34, 0xEFE83CB4, 0x1FB57C35, _NOT_USED_,

	/* exception (offset 0x3C in upm ram) */

	0xFFFFFC05, _NOT_USED_, _NOT_USED_, _NOT_USED_,

	};

	/* ------------------------------------------------------------------------- */


	/*
	* Check Board Identity:
	*
	* Test ETX ID string (ETX_xxx...)
	*
	* Return 1 always.
	*/

	int checkboard (void)
	{
	DECLARE_GLOBAL_DATA_PTR;

	unsigned char *s = getenv ("serial#");
	unsigned char *e;

	puts ("Board: ");

	#ifdef SB_ETX094
	gd->board_type = 0; /* 0 = 2SDRAM-Device */
	#else
	gd->board_type = 1; /* 1 = 1SDRAM-Device */
	#endif

	if (!s \|\| strncmp (s, "ETX_", 4)) {
	puts ("### No HW ID - assuming ETX_094\n");
	read_hw_vers ();
	return (0);
	}

	for (e = s; *e; ++e) {
	if (*e == ' ')
	break;
	}

	for (; s < e; ++s) {
	putc (*s);
	}
	putc ('\n');

	read_hw_vers ();
	return (0);
	}

	/* ------------------------------------------------------------------------- */

	long int initdram (int board_type)
	{
	volatile immap_t immap = (immap_t ) CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	long int size_b0, size_b1, size8, size9;

	upmconfig (UPMA, (uint *) sdram_table,
	sizeof (sdram_table) / sizeof (uint));

	/*
	* Preliminary prescaler for refresh (depends on number of
	* banks): This value is selected for four cycles every 62.4 us
	* with two SDRAM banks or four cycles every 31.2 us with one
	* bank. It will be adjusted after memory sizing.
	*/
	memctl->memc_mptpr = CFG_MPTPR_1BK_4K; /* MPTPR_PTP_DIV32 0x0200 */

	/* A3(SDRAM)=0 => Bursttype = Sequential
	* A2-A0(SDRAM)=010 => Burst length = 4
	* A4-A6(SDRAM)=010 => CasLat=2
	*/
	memctl->memc_mar = 0x00000088;

	/*
	* Map controller banks 2 and 3 to the SDRAM banks 2 and 3 at
	* preliminary addresses - these have to be modified after the
	* SDRAM size has been determined.
	*/
	memctl->memc_or2 = CFG_OR2_PRELIM;
	memctl->memc_br2 = CFG_BR2_PRELIM;

	if (board_type == 0) { /* "L" type boards have only one bank SDRAM */
	memctl->memc_or3 = CFG_OR3_PRELIM;
	memctl->memc_br3 = CFG_BR3_PRELIM;
	}

	memctl->memc_mamr = CFG_MAMR_8COL & (~(MAMR_PTAE)); /* no refresh yet */

	udelay (200);

	/* perform SDRAM initializsation sequence */

	memctl->memc_mcr = 0x80004128; /* SDRAM bank 0 (CS2) - Init Part 1 */
	memctl->memc_mcr = 0x80004734; /* SDRAM bank 0 (CS2) - Init Part 2 */
	udelay (1);

	if (board_type == 0) { /* "L" type boards have only one bank SDRAM */
	memctl->memc_mcr = 0x80006128; /* SDRAM bank 1 (CS3) - Init Part 1 */
	memctl->memc_mcr = 0x80006734; /* SDRAM bank 1 (CS3) - Init Part 2 */
	udelay (1);
	}

	memctl->memc_mamr \|= MAMR_PTAE; /* enable refresh */

	udelay (1000);

	/*
	* Check Bank 0 Memory Size for re-configuration
	*
	* try 8 column mode
	*/
	size8 = dram_size (CFG_MAMR_8COL, (ulong *) SDRAM_BASE2_PRELIM,
	SDRAM_MAX_SIZE);

	udelay (1000);

	/*
	* try 9 column mode
	*/
	size9 = dram_size (CFG_MAMR_9COL, (ulong *) SDRAM_BASE2_PRELIM,
	SDRAM_MAX_SIZE);

	if (size8 < size9) { /* leave configuration at 9 columns */
	size_b0 = size9;
	/* debug ("SDRAM Bank 0 in 9 column mode: %ld MB\n", size >> 20); */
	} else { /* back to 8 columns */
	size_b0 = size8;
	memctl->memc_mamr = CFG_MAMR_8COL;
	udelay (500);
	/* debug ("SDRAM Bank 0 in 8 column mode: %ld MB\n", size >> 20); */
	}

	if (board_type == 0) { /* "L" type boards have only one bank SDRAM */
	/*
	* Check Bank 1 Memory Size
	* use current column settings
	* [9 column SDRAM may also be used in 8 column mode,
	* but then only half the real size will be used.]
	*/
	size_b1 =
	dram_size (memctl->memc_mamr, (ulong *) SDRAM_BASE3_PRELIM,
	SDRAM_MAX_SIZE);
	/* debug ("SDRAM Bank 1: %ld MB\n", size8 >> 20); */
	} else {
	size_b1 = 0;
	}

	udelay (1000);

	/*
	* Adjust refresh rate depending on SDRAM type, both banks
	* For types > 128 MBit leave it at the current (fast) rate
	*/
	if ((size_b0 < 0x02000000) && (size_b1 < 0x02000000)) {
	/* reduce to 15.6 us (62.4 us / quad) */
	memctl->memc_mptpr = CFG_MPTPR_2BK_4K; /DIV16 /
	udelay (1000);
	}

	/*
	* Final mapping: map bigger bank first
	*/
	if (size_b1 > size_b0) { /* SDRAM Bank 1 is bigger - map first */

	memctl->memc_or3 = ((-size_b1) & 0xFFFF0000) \| CFG_OR_TIMING_SDRAM;
	memctl->memc_br3 =
	(CFG_SDRAM_BASE & BR_BA_MSK) \| BR_MS_UPMA \| BR_V;

	if (size_b0 > 0) {
	/*
	* Position Bank 0 immediately above Bank 1
	*/
	memctl->memc_or2 =
	((-size_b0) & 0xFFFF0000) \| CFG_OR_TIMING_SDRAM;
	memctl->memc_br2 =
	((CFG_SDRAM_BASE & BR_BA_MSK) \| BR_MS_UPMA \| BR_V)
	+ size_b1;
	} else {
	unsigned long reg;

	/*
	* No bank 0
	*
	* invalidate bank
	*/
	memctl->memc_br2 = 0;

	/* adjust refresh rate depending on SDRAM type, one bank */
	reg = memctl->memc_mptpr;
	reg >>= 1; /* reduce to CFG_MPTPR_1BK_8K / _4K */
	memctl->memc_mptpr = reg;
	}

	} else { /* SDRAM Bank 0 is bigger - map first */

	memctl->memc_or2 = ((-size_b0) & 0xFFFF0000) \| CFG_OR_TIMING_SDRAM;
	memctl->memc_br2 =
	(CFG_SDRAM_BASE & BR_BA_MSK) \| BR_MS_UPMA \| BR_V;

	if (size_b1 > 0) {
	/*
	* Position Bank 1 immediately above Bank 0
	*/
	memctl->memc_or3 =
	((-size_b1) & 0xFFFF0000) \| CFG_OR_TIMING_SDRAM;
	memctl->memc_br3 =
	((CFG_SDRAM_BASE & BR_BA_MSK) \| BR_MS_UPMA \| BR_V)
	+ size_b0;
	} else {
	unsigned long reg;

	/*
	* No bank 1
	*
	* invalidate bank
	*/
	memctl->memc_br3 = 0;

	/* adjust refresh rate depending on SDRAM type, one bank */
	reg = memctl->memc_mptpr;
	reg >>= 1; /* reduce to CFG_MPTPR_1BK_8K / _4K */
	memctl->memc_mptpr = reg;
	}
	}

	udelay (10000);

	return (size_b0 + size_b1);
	}

	/* ------------------------------------------------------------------------- */

	/*
	* Check memory range for valid RAM. A simple memory test determines
	* the actually available RAM size between addresses `base' and
	* `base + maxsize'. Some (not all) hardware errors are detected:
	* - short between address lines
	* - short between data lines
	*/

	static long int dram_size (long int mamr_value, long int *base,
	long int maxsize)
	{
	volatile immap_t immap = (immap_t ) CFG_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	volatile long int *addr;
	ulong cnt, val, size;
	ulong save[32]; /* to make test non-destructive */
	unsigned char i = 0;

	memctl->memc_mamr = mamr_value;

	for (cnt = maxsize / sizeof (long); cnt > 0; cnt >>= 1) {
	addr = base + cnt; /* pointer arith! */

	save[i++] = *addr;
	*addr = ~cnt;
	}

	/* write 0 to base address */
	addr = base;
	save[i] = *addr;
	*addr = 0;

	/* check at base address */
	if ((val = *addr) != 0) {
	/* Restore the original data before leaving the function.
	*/
	*addr = save[i];
	for (cnt = 1; cnt <= maxsize / sizeof(long); cnt <<= 1) {
	addr = (volatile ulong *) base + cnt;
	*addr = save[--i];
	}
	return (0);
	}

	for (cnt = 1; cnt <= maxsize / sizeof (long); cnt <<= 1) {
	addr = base + cnt; /* pointer arith! */

	val = *addr;
	*addr = save[--i];

	if (val != (~cnt)) {
	size = cnt * sizeof (long);
	/* Restore the original data before returning
	*/
	for (cnt <<= 1; cnt <= maxsize / sizeof (long); cnt <<= 1) {
	addr = (volatile ulong *) base + cnt;
	*addr = save[--i];
	}
	return (size);
	}
	}
	return (maxsize);
	}

	/* ------------------------------------------------------------------------- */

	/* HW-ID Table (Bits: 2^9;2^7;2^5) */
	#define HW_ID_0 0x0000
	#define HW_ID_1 0x0020
	#define HW_ID_2 0x0080
	#define HW_ID_3 0x00a0
	#define HW_ID_4 0x0200
	#define HW_ID_5 0x0220
	#define HW_ID_6 0x0280
	#define HW_ID_7 0x02a0

	void read_hw_vers ()
	{
	unsigned short rd_msk = 0x02A0;

	/* HW-ID pin-definition */
	volatile immap_t immr = (immap_t ) CFG_IMMR;

	immr->im_ioport.iop_pddir &= ~(rd_msk);
	immr->im_ioport.iop_pdpar &= ~(rd_msk);

	/* debug printf("State of PD: %x\n",immr->im_ioport.iop_pddat); */

	/* Check the HW-ID */
	printf ("HW-Version: ");
	switch (immr->im_ioport.iop_pddat & rd_msk) {
	case HW_ID_0:
	printf ("V0.1 - V0.3 / W97238-Q3162-A1-1-2\n");
	break;
	case HW_ID_1:
	printf ("V0.9 / W50037-Q1-D6-1\n");
	break;
	case HW_ID_2:
	printf ("NOT USED - assuming ID#2\n");
	break;
	case HW_ID_3:
	printf ("NOT USED - assuming ID#3\n");
	break;
	case HW_ID_4:
	printf ("NOT USED - assuming ID#4\n");
	break;
	case HW_ID_5:
	printf ("NOT USED - assuming ID#5\n");
	break;
	case HW_ID_6:
	printf ("NOT USED - assuming ID#6\n");
	break;
	case HW_ID_7:
	printf ("NOT USED - assuming ID#7\n");
	break;
	default:
	printf ("###Error###\n");
	break;
	}
	}

	/* ------------------------------------------------------------------------- */