board/bmw/flash.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 <mpc824x.h>
 #include <asm/processor.h>
 #include <asm/pci_io.h>

 #define ROM_CS0_START	0xFF800000
 #define ROM_CS1_START	0xFF000000

 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];	/* info for FLASH chips    */

 #if defined(CONFIG_ENV_IS_IN_FLASH)
 # ifndef  CONFIG_ENV_ADDR
 #  define CONFIG_ENV_ADDR  (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
 # endif
 # ifndef  CONFIG_ENV_SIZE
 #  define CONFIG_ENV_SIZE  CONFIG_ENV_SECT_SIZE
 # endif
 # ifndef  CONFIG_ENV_SECT_SIZE
 #  define CONFIG_ENV_SECT_SIZE  CONFIG_ENV_SIZE
 # endif
 #endif

 /*-----------------------------------------------------------------------
  * Functions
  */
 static int write_word (flash_info_t * info, ulong dest, ulong data);

 #if 0
 static void flash_get_offsets (ulong base, flash_info_t * info);
 #endif /* 0 */

 /*flash command address offsets*/

 #if 0
 #define ADDR0           (0x555)
 #define ADDR1           (0x2AA)
 #define ADDR3           (0x001)
 #else
 #define ADDR0		(0xAAA)
 #define ADDR1		(0x555)
 #define ADDR3		(0x001)
 #endif

 #define FLASH_WORD_SIZE unsigned char

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

 #if 0
 static int byte_parity_odd (unsigned char x) __attribute__ ((const));
 #endif /* 0 */
 static unsigned long flash_id (unsigned char mfct, unsigned char chip)
 	__attribute__ ((const));

 typedef struct {
 	FLASH_WORD_SIZE extval;
 	unsigned short intval;
 } map_entry;

 #if 0
 static int byte_parity_odd (unsigned char x)
 {
 	x ^= x >> 4;
 	x ^= x >> 2;
 	x ^= x >> 1;
 	return (x & 0x1) != 0;
 }
 #endif /* 0 */


 static unsigned long flash_id (unsigned char mfct, unsigned char chip)
 {
 	static const map_entry mfct_map[] = {
 		{(FLASH_WORD_SIZE) AMD_MANUFACT,
 		 (unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
 		{(FLASH_WORD_SIZE) FUJ_MANUFACT,
 		 (unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
 		{(FLASH_WORD_SIZE) STM_MANUFACT,
 		 (unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
 		{(FLASH_WORD_SIZE) MT_MANUFACT,
 		 (unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
 		{(FLASH_WORD_SIZE) INTEL_MANUFACT,
 		 (unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
 		{(FLASH_WORD_SIZE) INTEL_ALT_MANU,
 		 (unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
 	};

 	static const map_entry chip_map[] = {
 		{AMD_ID_F040B, FLASH_AM040},
 		{(FLASH_WORD_SIZE) STM_ID_x800AB, FLASH_STM800AB}
 	};

 	const map_entry *p;
 	unsigned long result = FLASH_UNKNOWN;

 	/* find chip id */
 	for (p = &chip_map[0];
 	     p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++)
 		if (p->extval == chip) {
 			result = FLASH_VENDMASK | p->intval;
 			break;
 		}

 	/* find vendor id */
 	for (p = &mfct_map[0];
 	     p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++)
 		if (p->extval == mfct) {
 			result &= ~FLASH_VENDMASK;
 			result |= (unsigned long) p->intval << 16;
 			break;
 		}

 	return result;
 }


 unsigned long flash_init (void)
 {
 	unsigned long i;
 	unsigned char j;
 	static const ulong flash_banks[] = CONFIG_SYS_FLASH_BANKS;

 	/* Init: no FLASHes known */
 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 		flash_info_t *const pflinfo = &flash_info[i];

 		pflinfo->flash_id = FLASH_UNKNOWN;
 		pflinfo->size = 0;
 		pflinfo->sector_count = 0;
 	}

 	for (i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++) {
 		flash_info_t *const pflinfo = &flash_info[i];
 		const unsigned long base_address = flash_banks[i];
 		volatile FLASH_WORD_SIZE *const flash =
 			(FLASH_WORD_SIZE *) base_address;
 #if 0
 		volatile FLASH_WORD_SIZE *addr2;
 #endif
 #if 0
 		/* write autoselect sequence */
 		flash[0x5555] = 0xaa;
 		flash[0x2aaa] = 0x55;
 		flash[0x5555] = 0x90;
 #else
 		flash[0xAAA << (3 * i)] = 0xaa;
 		flash[0x555 << (3 * i)] = 0x55;
 		flash[0xAAA << (3 * i)] = 0x90;
 #endif
 		__asm__ __volatile__ ("sync");

 #if 0
 		pflinfo->flash_id = flash_id (flash[0x0], flash[0x1]);
 #else
 		pflinfo->flash_id =
 			flash_id (flash[0x0], flash[0x2 + 14 * i]);
 #endif

 		switch (pflinfo->flash_id & FLASH_TYPEMASK) {
 		case FLASH_AM040:
 			pflinfo->size = 0x00080000;
 			pflinfo->sector_count = 8;
 			for (j = 0; j < 8; j++) {
 				pflinfo->start[j] =
 					base_address + 0x00010000 * j;
 				pflinfo->protect[j] = flash[(j << 16) | 0x2];
 			}
 			break;
 		case FLASH_STM800AB:
 			pflinfo->size = 0x00100000;
 			pflinfo->sector_count = 19;
 			pflinfo->start[0] = base_address;
 			pflinfo->start[1] = base_address + 0x4000;
 			pflinfo->start[2] = base_address + 0x6000;
 			pflinfo->start[3] = base_address + 0x8000;
 			for (j = 1; j < 16; j++) {
 				pflinfo->start[j + 3] =
 					base_address + 0x00010000 * j;
 			}
 #if 0
 			/* check for protected sectors */
 			for (j = 0; j < pflinfo->sector_count; j++) {
 				/* read sector protection at sector address, (A7 .. A0) = 0x02 */
 				/* D0 = 1 if protected */
 				addr2 = (volatile FLASH_WORD_SIZE
 					 *) (pflinfo->start[j]);
 				if (pflinfo->flash_id & FLASH_MAN_SST)
 					pflinfo->protect[j] = 0;
 				else
 					pflinfo->protect[j] = addr2[2] & 1;
 			}
 #endif
 			break;
 		}
 		/* Protect monitor and environment sectors
 		 */
 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
 		flash_protect (FLAG_PROTECT_SET,
 			       CONFIG_SYS_MONITOR_BASE,
 			       CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
 			       &flash_info[0]);
 #endif

 #if defined(CONFIG_ENV_IS_IN_FLASH) && defined(CONFIG_ENV_ADDR)
 		flash_protect (FLAG_PROTECT_SET,
 			       CONFIG_ENV_ADDR,
 			       CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
 			       &flash_info[0]);
 #endif

 		/* reset device to read mode */
 		flash[0x0000] = 0xf0;
 		__asm__ __volatile__ ("sync");
 	}

 	return flash_info[0].size + flash_info[1].size;
 }

 #if 0
 static void flash_get_offsets (ulong base, flash_info_t * info)
 {
 	int i;

 	/* set up sector start address table */
 	if (info->flash_id & FLASH_MAN_SST) {
 		for (i = 0; i < info->sector_count; i++)
 			info->start[i] = base + (i * 0x00010000);
 	} else if (info->flash_id & FLASH_BTYPE) {
 		/* set sector offsets for bottom boot block type    */
 		info->start[0] = base + 0x00000000;
 		info->start[1] = base + 0x00004000;
 		info->start[2] = base + 0x00006000;
 		info->start[3] = base + 0x00008000;
 		for (i = 4; i < info->sector_count; i++) {
 			info->start[i] = base + (i * 0x00010000) - 0x00030000;
 		}
 	} else {
 		/* set sector offsets for top boot block type       */
 		i = info->sector_count - 1;
 		info->start[i--] = base + info->size - 0x00004000;
 		info->start[i--] = base + info->size - 0x00006000;
 		info->start[i--] = base + info->size - 0x00008000;
 		for (; i >= 0; i--) {
 			info->start[i] = base + i * 0x00010000;
 		}
 	}

 }
 #endif /* 0 */

 /*-----------------------------------------------------------------------
  */
 void flash_print_info (flash_info_t * info)
 {
 	static const char unk[] = "Unknown";
 	const char *mfct = unk, *type = unk;
 	unsigned int i;

 	if (info->flash_id != FLASH_UNKNOWN) {
 		switch (info->flash_id & FLASH_VENDMASK) {
 		case FLASH_MAN_AMD:
 			mfct = "AMD";
 			break;
 		case FLASH_MAN_FUJ:
 			mfct = "FUJITSU";
 			break;
 		case FLASH_MAN_STM:
 			mfct = "STM";
 			break;
 		case FLASH_MAN_SST:
 			mfct = "SST";
 			break;
 		case FLASH_MAN_BM:
 			mfct = "Bright Microelectonics";
 			break;
 		case FLASH_MAN_INTEL:
 			mfct = "Intel";
 			break;
 		}

 		switch (info->flash_id & FLASH_TYPEMASK) {
 		case FLASH_AM040:
 			type = "AM29F040B (512K * 8, uniform sector size)";
 			break;
 		case FLASH_AM400B:
 			type = "AM29LV400B (4 Mbit, bottom boot sect)";
 			break;
 		case FLASH_AM400T:
 			type = "AM29LV400T (4 Mbit, top boot sector)";
 			break;
 		case FLASH_AM800B:
 			type = "AM29LV800B (8 Mbit, bottom boot sect)";
 			break;
 		case FLASH_AM800T:
 			type = "AM29LV800T (8 Mbit, top boot sector)";
 			break;
 		case FLASH_AM160T:
 			type = "AM29LV160T (16 Mbit, top boot sector)";
 			break;
 		case FLASH_AM320B:
 			type = "AM29LV320B (32 Mbit, bottom boot sect)";
 			break;
 		case FLASH_AM320T:
 			type = "AM29LV320T (32 Mbit, top boot sector)";
 			break;
 		case FLASH_STM800AB:
 			type = "M29W800AB (8 Mbit, bottom boot sect)";
 			break;
 		case FLASH_SST800A:
 			type = "SST39LF/VF800 (8 Mbit, uniform sector size)";
 			break;
 		case FLASH_SST160A:
 			type = "SST39LF/VF160 (16 Mbit, uniform sector size)";
 			break;
 		}
 	}

 	printf ("\n  Brand: %s Type: %s\n"
 		"  Size: %lu KB in %d Sectors\n",
 		mfct, type, info->size >> 10, info->sector_count);

 	printf ("  Sector Start Addresses:");

 	for (i = 0; i < info->sector_count; i++) {
 		unsigned long size;
 		unsigned int erased;
 		unsigned long *flash = (unsigned long *) info->start[i];

 		/*
 		 * Check if whole sector is erased
 		 */
 		size = (i != (info->sector_count - 1)) ?
 			(info->start[i + 1] - info->start[i]) >> 2 :
 			(info->start[0] + info->size - info->start[i]) >> 2;

 		for (flash = (unsigned long *) info->start[i], erased = 1;
 		     (flash != (unsigned long *) info->start[i] + size)
 		     && erased; flash++)
 			erased = *flash == ~0x0UL;

 		printf ("%s %08lX %s %s",
 			(i % 5) ? "" : "\n   ",
 			info->start[i],
 			erased ? "E" : " ", info->protect[i] ? "RO" : "  ");
 	}

 	puts ("\n");
 	return;
 }

 #if 0

 /*
  * The following code cannot be run from FLASH!
  */
 ulong flash_get_size (vu_long * addr, flash_info_t * info)
 {
 	short i;
 	FLASH_WORD_SIZE value;
 	ulong base = (ulong) addr;
 	volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) addr;

 	printf ("flash_get_size: \n");
 	/* Write auto select command: read Manufacturer ID */
 	eieio ();
 	addr2[ADDR0] = (FLASH_WORD_SIZE) 0xAA;
 	addr2[ADDR1] = (FLASH_WORD_SIZE) 0x55;
 	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x90;
 	value = addr2[0];

 	switch (value) {
 	case (FLASH_WORD_SIZE) AMD_MANUFACT:
 		info->flash_id = FLASH_MAN_AMD;
 		break;
 	case (FLASH_WORD_SIZE) FUJ_MANUFACT:
 		info->flash_id = FLASH_MAN_FUJ;
 		break;
 	case (FLASH_WORD_SIZE) SST_MANUFACT:
 		info->flash_id = FLASH_MAN_SST;
 		break;
 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0;
 		return (0);	/* no or unknown flash  */
 	}
 	printf ("recognised manufacturer");

 	value = addr2[ADDR3];	/* device ID        */
 	debug ("\ndev_code=%x\n", value);

 	switch (value) {
 	case (FLASH_WORD_SIZE) AMD_ID_LV400T:
 		info->flash_id += FLASH_AM400T;
 		info->sector_count = 11;
 		info->size = 0x00080000;
 		break;		/* => 0.5 MB        */

 	case (FLASH_WORD_SIZE) AMD_ID_LV400B:
 		info->flash_id += FLASH_AM400B;
 		info->sector_count = 11;
 		info->size = 0x00080000;
 		break;		/* => 0.5 MB        */

 	case (FLASH_WORD_SIZE) AMD_ID_LV800T:
 		info->flash_id += FLASH_AM800T;
 		info->sector_count = 19;
 		info->size = 0x00100000;
 		break;		/* => 1 MB      */

 	case (FLASH_WORD_SIZE) AMD_ID_LV800B:
 		info->flash_id += FLASH_AM800B;
 		info->sector_count = 19;
 		info->size = 0x00100000;
 		break;		/* => 1 MB      */

 	case (FLASH_WORD_SIZE) AMD_ID_LV160T:
 		info->flash_id += FLASH_AM160T;
 		info->sector_count = 35;
 		info->size = 0x00200000;
 		break;		/* => 2 MB      */

 	case (FLASH_WORD_SIZE) AMD_ID_LV160B:
 		info->flash_id += FLASH_AM160B;
 		info->sector_count = 35;
 		info->size = 0x00200000;
 		break;		/* => 2 MB      */

 	case (FLASH_WORD_SIZE) SST_ID_xF800A:
 		info->flash_id += FLASH_SST800A;
 		info->sector_count = 16;
 		info->size = 0x00100000;
 		break;		/* => 1 MB      */

 	case (FLASH_WORD_SIZE) SST_ID_xF160A:
 		info->flash_id += FLASH_SST160A;
 		info->sector_count = 32;
 		info->size = 0x00200000;
 		break;		/* => 2 MB      */

 	case (FLASH_WORD_SIZE) AMD_ID_F040B:
 		info->flash_id += FLASH_AM040;
 		info->sector_count = 8;
 		info->size = 0x00080000;
 		break;		/* => 0.5 MB      */

 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		return (0);	/* => no or unknown flash */

 	}

 	printf ("flash id %lx; sector count %x, size %lx\n", info->flash_id,
 		info->sector_count, info->size);
 	/* set up sector start address table */
 	if (info->flash_id & FLASH_MAN_SST) {
 		for (i = 0; i < info->sector_count; i++)
 			info->start[i] = base + (i * 0x00010000);
 	} else if (info->flash_id & FLASH_BTYPE) {
 		/* set sector offsets for bottom boot block type    */
 		info->start[0] = base + 0x00000000;
 		info->start[1] = base + 0x00004000;
 		info->start[2] = base + 0x00006000;
 		info->start[3] = base + 0x00008000;
 		for (i = 4; i < info->sector_count; i++) {
 			info->start[i] = base + (i * 0x00010000) - 0x00030000;
 		}
 	} else {
 		/* set sector offsets for top boot block type       */
 		i = info->sector_count - 1;
 		info->start[i--] = base + info->size - 0x00004000;
 		info->start[i--] = base + info->size - 0x00006000;
 		info->start[i--] = base + info->size - 0x00008000;
 		for (; i >= 0; i--) {
 			info->start[i] = base + i * 0x00010000;
 		}
 	}

 	/* check for protected sectors */
 	for (i = 0; i < info->sector_count; i++) {
 		/* read sector protection at sector address, (A7 .. A0) = 0x02 */
 		/* D0 = 1 if protected */
 		addr2 = (volatile FLASH_WORD_SIZE *) (info->start[i]);
 		if (info->flash_id & FLASH_MAN_SST)
 			info->protect[i] = 0;
 		else
 			info->protect[i] = addr2[2] & 1;
 	}

 	/*
 	 * Prevent writes to uninitialized FLASH.
 	 */
 	if (info->flash_id != FLASH_UNKNOWN) {
 		addr2 = (FLASH_WORD_SIZE *) info->start[0];
 		*addr2 = (FLASH_WORD_SIZE) 0x00F000F0;	/* reset bank */
 	}

 	return (info->size);
 }

 #endif


 int flash_erase (flash_info_t * info, int s_first, int s_last)
 {
 	volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *) (info->start[0]);
 	int flag, prot, sect, l_sect;
 	ulong start, now, last;
 	unsigned char sh8b;

 	if ((s_first < 0) || (s_first > s_last)) {
 		if (info->flash_id == FLASH_UNKNOWN) {
 			printf ("- missing\n");
 		} else {
 			printf ("- no sectors to erase\n");
 		}
 		return 1;
 	}

 	if ((info->flash_id == FLASH_UNKNOWN) ||
 	    (info->flash_id > (FLASH_MAN_STM | FLASH_AMD_COMP))) {
 		printf ("Can't erase unknown flash type - aborted\n");
 		return 1;
 	}

 	prot = 0;
 	for (sect = s_first; sect <= s_last; ++sect) {
 		if (info->protect[sect]) {
 			prot++;
 		}
 	}

 	if (prot) {
 		printf ("- Warning: %d protected sectors will not be erased!\n", prot);
 	} else {
 		printf ("\n");
 	}

 	l_sect = -1;

 	/* Check the ROM CS */
 	if ((info->start[0] >= ROM_CS1_START)
 	    && (info->start[0] < ROM_CS0_START))
 		sh8b = 3;
 	else
 		sh8b = 0;

 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts ();

 	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00AA00AA;
 	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE) 0x00550055;
 	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00800080;
 	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00AA00AA;
 	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE) 0x00550055;

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect <= s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			addr = (FLASH_WORD_SIZE *) (info->start[0] + ((info->
 								       start
 								       [sect]
 								       -
 								       info->
 								       start
 								       [0]) <<
 								      sh8b));
 			if (info->flash_id & FLASH_MAN_SST) {
 				addr[ADDR0 << sh8b] =
 					(FLASH_WORD_SIZE) 0x00AA00AA;
 				addr[ADDR1 << sh8b] =
 					(FLASH_WORD_SIZE) 0x00550055;
 				addr[ADDR0 << sh8b] =
 					(FLASH_WORD_SIZE) 0x00800080;
 				addr[ADDR0 << sh8b] =
 					(FLASH_WORD_SIZE) 0x00AA00AA;
 				addr[ADDR1 << sh8b] =
 					(FLASH_WORD_SIZE) 0x00550055;
 				addr[0] = (FLASH_WORD_SIZE) 0x00500050;	/* block erase */
 				udelay (30000);	/* wait 30 ms */
 			} else
 				addr[0] = (FLASH_WORD_SIZE) 0x00300030;	/* sector erase */
 			l_sect = sect;
 		}
 	}

 	/* re-enable interrupts if necessary */
 	if (flag)
 		enable_interrupts ();

 	/* wait at least 80us - let's wait 1 ms */
 	udelay (1000);

 	/*
 	 * We wait for the last triggered sector
 	 */
 	if (l_sect < 0)
 		goto DONE;

 	start = get_timer (0);
 	last = start;
 	addr = (FLASH_WORD_SIZE *) (info->start[0] + ((info->start[l_sect] -
 						       info->
 						       start[0]) << sh8b));
 	while ((addr[0] & (FLASH_WORD_SIZE) 0x00800080) !=
 	       (FLASH_WORD_SIZE) 0x00800080) {
 		if ((now = get_timer (start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 			printf ("Timeout\n");
 			return 1;
 		}
 		/* show that we're waiting */
 		if ((now - last) > 1000) {	/* every second */
 			serial_putc ('.');
 			last = now;
 		}
 	}

       DONE:
 	/* reset to read mode */
 	addr = (FLASH_WORD_SIZE *) info->start[0];
 	addr[0] = (FLASH_WORD_SIZE) 0x00F000F0;	/* reset bank */

 	printf (" done\n");
 	return 0;
 }

 /*-----------------------------------------------------------------------
  * Copy memory to flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */

 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 {
 	ulong cp, wp, data;
 	int i, l, rc;

 	wp = (addr & ~3);	/* get lower word aligned address */

 	/*
 	 * handle unaligned start bytes
 	 */
 	if ((l = addr - wp) != 0) {
 		data = 0;
 		for (i = 0, cp = wp; i < l; ++i, ++cp) {
 			data = (data << 8) | (*(uchar *) cp);
 		}
 		for (; i < 4 && cnt > 0; ++i) {
 			data = (data << 8) | *src++;
 			--cnt;
 			++cp;
 		}
 		for (; cnt == 0 && i < 4; ++i, ++cp) {
 			data = (data << 8) | (*(uchar *) cp);
 		}

 		if ((rc = write_word (info, wp, data)) != 0) {
 			return (rc);
 		}
 		wp += 4;
 	}

 	/*
 	 * handle word aligned part
 	 */
 	while (cnt >= 4) {
 		data = 0;
 		for (i = 0; i < 4; ++i) {
 			data = (data << 8) | *src++;
 		}
 		if ((rc = write_word (info, wp, data)) != 0) {
 			return (rc);
 		}
 		wp += 4;
 		cnt -= 4;
 	}

 	if (cnt == 0) {
 		return (0);
 	}

 	/*
 	 * handle unaligned tail bytes
 	 */
 	data = 0;
 	for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
 		data = (data << 8) | *src++;
 		--cnt;
 	}
 	for (; i < 4; ++i, ++cp) {
 		data = (data << 8) | (*(uchar *) cp);
 	}

 	return (write_word (info, wp, data));
 }

 /*-----------------------------------------------------------------------
  * Write a word to Flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 static int write_word (flash_info_t * info, ulong dest, ulong data)
 {
 	volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) info->start[0];
 	volatile FLASH_WORD_SIZE *dest2;
 	volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
 	ulong start;
 	int flag;
 	int i;
 	unsigned char sh8b;

 	/* Check the ROM CS */
 	if ((info->start[0] >= ROM_CS1_START)
 	    && (info->start[0] < ROM_CS0_START))
 		sh8b = 3;
 	else
 		sh8b = 0;

 	dest2 = (FLASH_WORD_SIZE *) (((dest - info->start[0]) << sh8b) +
 				     info->start[0]);

 	/* Check if Flash is (sufficiently) erased */
 	if ((*dest2 & (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
 		return (2);
 	}
 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts ();

 	for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
 		addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00AA00AA;
 		addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE) 0x00550055;
 		addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00A000A0;

 		dest2[i << sh8b] = data2[i];

 		/* re-enable interrupts if necessary */
 		if (flag)
 			enable_interrupts ();

 		/* data polling for D7 */
 		start = get_timer (0);
 		while ((dest2[i << sh8b] & (FLASH_WORD_SIZE) 0x00800080) !=
 		       (data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {
 			if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 				return (1);
 			}
 		}
 	}

 	return (0);
 }

 /*-----------------------------------------------------------------------
  */
	/*
	* (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 <mpc824x.h>
	#include <asm/processor.h>
	#include <asm/pci_io.h>

	#define ROM_CS0_START 0xFF800000
	#define ROM_CS1_START 0xFF000000

	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */

	#if defined(CONFIG_ENV_IS_IN_FLASH)
	# ifndef CONFIG_ENV_ADDR
	# define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
	# endif
	# ifndef CONFIG_ENV_SIZE
	# define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
	# endif
	# ifndef CONFIG_ENV_SECT_SIZE
	# define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
	# endif
	#endif

	/*-----------------------------------------------------------------------
	* Functions
	*/
	static int write_word (flash_info_t * info, ulong dest, ulong data);

	#if 0
	static void flash_get_offsets (ulong base, flash_info_t * info);
	#endif /* 0 */

	/flash command address offsets/

	#if 0
	#define ADDR0 (0x555)
	#define ADDR1 (0x2AA)
	#define ADDR3 (0x001)
	#else
	#define ADDR0 (0xAAA)
	#define ADDR1 (0x555)
	#define ADDR3 (0x001)
	#endif

	#define FLASH_WORD_SIZE unsigned char

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

	#if 0
	static int byte_parity_odd (unsigned char x) __attribute__ ((const));
	#endif /* 0 */
	static unsigned long flash_id (unsigned char mfct, unsigned char chip)
	__attribute__ ((const));

	typedef struct {
	FLASH_WORD_SIZE extval;
	unsigned short intval;
	} map_entry;

	#if 0
	static int byte_parity_odd (unsigned char x)
	{
	x ^= x >> 4;
	x ^= x >> 2;
	x ^= x >> 1;
	return (x & 0x1) != 0;
	}
	#endif /* 0 */


	static unsigned long flash_id (unsigned char mfct, unsigned char chip)
	{
	static const map_entry mfct_map[] = {
	{(FLASH_WORD_SIZE) AMD_MANUFACT,
	(unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
	{(FLASH_WORD_SIZE) FUJ_MANUFACT,
	(unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
	{(FLASH_WORD_SIZE) STM_MANUFACT,
	(unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
	{(FLASH_WORD_SIZE) MT_MANUFACT,
	(unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
	{(FLASH_WORD_SIZE) INTEL_MANUFACT,
	(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
	{(FLASH_WORD_SIZE) INTEL_ALT_MANU,
	(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
	};

	static const map_entry chip_map[] = {
	{AMD_ID_F040B, FLASH_AM040},
	{(FLASH_WORD_SIZE) STM_ID_x800AB, FLASH_STM800AB}
	};

	const map_entry *p;
	unsigned long result = FLASH_UNKNOWN;

	/* find chip id */
	for (p = &chip_map[0];
	p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++)
	if (p->extval == chip) {
	result = FLASH_VENDMASK \| p->intval;
	break;
	}

	/* find vendor id */
	for (p = &mfct_map[0];
	p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++)
	if (p->extval == mfct) {
	result &= ~FLASH_VENDMASK;
	result \|= (unsigned long) p->intval << 16;
	break;
	}

	return result;
	}


	unsigned long flash_init (void)
	{
	unsigned long i;
	unsigned char j;
	static const ulong flash_banks[] = CONFIG_SYS_FLASH_BANKS;

	/* Init: no FLASHes known */
	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
	flash_info_t *const pflinfo = &flash_info[i];

	pflinfo->flash_id = FLASH_UNKNOWN;
	pflinfo->size = 0;
	pflinfo->sector_count = 0;
	}

	for (i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++) {
	flash_info_t *const pflinfo = &flash_info[i];
	const unsigned long base_address = flash_banks[i];
	volatile FLASH_WORD_SIZE *const flash =
	(FLASH_WORD_SIZE *) base_address;
	#if 0
	volatile FLASH_WORD_SIZE *addr2;
	#endif
	#if 0
	/* write autoselect sequence */
	flash[0x5555] = 0xaa;
	flash[0x2aaa] = 0x55;
	flash[0x5555] = 0x90;
	#else
	flash[0xAAA << (3 * i)] = 0xaa;
	flash[0x555 << (3 * i)] = 0x55;
	flash[0xAAA << (3 * i)] = 0x90;
	#endif
	__asm__ __volatile__ ("sync");

	#if 0
	pflinfo->flash_id = flash_id (flash[0x0], flash[0x1]);
	#else
	pflinfo->flash_id =
	flash_id (flash[0x0], flash[0x2 + 14 * i]);
	#endif

	switch (pflinfo->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM040:
	pflinfo->size = 0x00080000;
	pflinfo->sector_count = 8;
	for (j = 0; j < 8; j++) {
	pflinfo->start[j] =
	base_address + 0x00010000 * j;
	pflinfo->protect[j] = flash[(j << 16) \| 0x2];
	}
	break;
	case FLASH_STM800AB:
	pflinfo->size = 0x00100000;
	pflinfo->sector_count = 19;
	pflinfo->start[0] = base_address;
	pflinfo->start[1] = base_address + 0x4000;
	pflinfo->start[2] = base_address + 0x6000;
	pflinfo->start[3] = base_address + 0x8000;
	for (j = 1; j < 16; j++) {
	pflinfo->start[j + 3] =
	base_address + 0x00010000 * j;
	}
	#if 0
	/* check for protected sectors */
	for (j = 0; j < pflinfo->sector_count; j++) {
	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
	/* D0 = 1 if protected */
	addr2 = (volatile FLASH_WORD_SIZE
	*) (pflinfo->start[j]);
	if (pflinfo->flash_id & FLASH_MAN_SST)
	pflinfo->protect[j] = 0;
	else
	pflinfo->protect[j] = addr2[2] & 1;
	}
	#endif
	break;
	}
	/* Protect monitor and environment sectors
	*/
	#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
	flash_protect (FLAG_PROTECT_SET,
	CONFIG_SYS_MONITOR_BASE,
	CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
	&flash_info[0]);
	#endif

	#if defined(CONFIG_ENV_IS_IN_FLASH) && defined(CONFIG_ENV_ADDR)
	flash_protect (FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
	&flash_info[0]);
	#endif

	/* reset device to read mode */
	flash[0x0000] = 0xf0;
	__asm__ __volatile__ ("sync");
	}

	return flash_info[0].size + flash_info[1].size;
	}

	#if 0
	static void flash_get_offsets (ulong base, flash_info_t * info)
	{
	int i;

	/* set up sector start address table */
	if (info->flash_id & FLASH_MAN_SST) {
	for (i = 0; i < info->sector_count; i++)
	info->start[i] = base + (i * 0x00010000);
	} else if (info->flash_id & FLASH_BTYPE) {
	/* set sector offsets for bottom boot block type */
	info->start[0] = base + 0x00000000;
	info->start[1] = base + 0x00004000;
	info->start[2] = base + 0x00006000;
	info->start[3] = base + 0x00008000;
	for (i = 4; i < info->sector_count; i++) {
	info->start[i] = base + (i * 0x00010000) - 0x00030000;
	}
	} else {
	/* set sector offsets for top boot block type */
	i = info->sector_count - 1;
	info->start[i--] = base + info->size - 0x00004000;
	info->start[i--] = base + info->size - 0x00006000;
	info->start[i--] = base + info->size - 0x00008000;
	for (; i >= 0; i--) {
	info->start[i] = base + i * 0x00010000;
	}
	}

	}
	#endif /* 0 */

	/*-----------------------------------------------------------------------
	*/
	void flash_print_info (flash_info_t * info)
	{
	static const char unk[] = "Unknown";
	const char mfct = unk, type = unk;
	unsigned int i;

	if (info->flash_id != FLASH_UNKNOWN) {
	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_AMD:
	mfct = "AMD";
	break;
	case FLASH_MAN_FUJ:
	mfct = "FUJITSU";
	break;
	case FLASH_MAN_STM:
	mfct = "STM";
	break;
	case FLASH_MAN_SST:
	mfct = "SST";
	break;
	case FLASH_MAN_BM:
	mfct = "Bright Microelectonics";
	break;
	case FLASH_MAN_INTEL:
	mfct = "Intel";
	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM040:
	type = "AM29F040B (512K * 8, uniform sector size)";
	break;
	case FLASH_AM400B:
	type = "AM29LV400B (4 Mbit, bottom boot sect)";
	break;
	case FLASH_AM400T:
	type = "AM29LV400T (4 Mbit, top boot sector)";
	break;
	case FLASH_AM800B:
	type = "AM29LV800B (8 Mbit, bottom boot sect)";
	break;
	case FLASH_AM800T:
	type = "AM29LV800T (8 Mbit, top boot sector)";
	break;
	case FLASH_AM160T:
	type = "AM29LV160T (16 Mbit, top boot sector)";
	break;
	case FLASH_AM320B:
	type = "AM29LV320B (32 Mbit, bottom boot sect)";
	break;
	case FLASH_AM320T:
	type = "AM29LV320T (32 Mbit, top boot sector)";
	break;
	case FLASH_STM800AB:
	type = "M29W800AB (8 Mbit, bottom boot sect)";
	break;
	case FLASH_SST800A:
	type = "SST39LF/VF800 (8 Mbit, uniform sector size)";
	break;
	case FLASH_SST160A:
	type = "SST39LF/VF160 (16 Mbit, uniform sector size)";
	break;
	}
	}

	printf ("\n Brand: %s Type: %s\n"
	" Size: %lu KB in %d Sectors\n",
	mfct, type, info->size >> 10, info->sector_count);

	printf (" Sector Start Addresses:");

	for (i = 0; i < info->sector_count; i++) {
	unsigned long size;
	unsigned int erased;
	unsigned long flash = (unsigned long ) info->start[i];

	/*
	* Check if whole sector is erased
	*/
	size = (i != (info->sector_count - 1)) ?
	(info->start[i + 1] - info->start[i]) >> 2 :
	(info->start[0] + info->size - info->start[i]) >> 2;

	for (flash = (unsigned long *) info->start[i], erased = 1;
	(flash != (unsigned long *) info->start[i] + size)
	&& erased; flash++)
	erased = *flash == ~0x0UL;

	printf ("%s %08lX %s %s",
	(i % 5) ? "" : "\n ",
	info->start[i],
	erased ? "E" : " ", info->protect[i] ? "RO" : " ");
	}

	puts ("\n");
	return;
	}

	#if 0

	/*
	* The following code cannot be run from FLASH!
	*/
	ulong flash_get_size (vu_long * addr, flash_info_t * info)
	{
	short i;
	FLASH_WORD_SIZE value;
	ulong base = (ulong) addr;
	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE ) addr;

	printf ("flash_get_size: \n");
	/* Write auto select command: read Manufacturer ID */
	eieio ();
	addr2[ADDR0] = (FLASH_WORD_SIZE) 0xAA;
	addr2[ADDR1] = (FLASH_WORD_SIZE) 0x55;
	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x90;
	value = addr2[0];

	switch (value) {
	case (FLASH_WORD_SIZE) AMD_MANUFACT:
	info->flash_id = FLASH_MAN_AMD;
	break;
	case (FLASH_WORD_SIZE) FUJ_MANUFACT:
	info->flash_id = FLASH_MAN_FUJ;
	break;
	case (FLASH_WORD_SIZE) SST_MANUFACT:
	info->flash_id = FLASH_MAN_SST;
	break;
	default:
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	return (0); /* no or unknown flash */
	}
	printf ("recognised manufacturer");

	value = addr2[ADDR3]; /* device ID */
	debug ("\ndev_code=%x\n", value);

	switch (value) {
	case (FLASH_WORD_SIZE) AMD_ID_LV400T:
	info->flash_id += FLASH_AM400T;
	info->sector_count = 11;
	info->size = 0x00080000;
	break; /* => 0.5 MB */

	case (FLASH_WORD_SIZE) AMD_ID_LV400B:
	info->flash_id += FLASH_AM400B;
	info->sector_count = 11;
	info->size = 0x00080000;
	break; /* => 0.5 MB */

	case (FLASH_WORD_SIZE) AMD_ID_LV800T:
	info->flash_id += FLASH_AM800T;
	info->sector_count = 19;
	info->size = 0x00100000;
	break; /* => 1 MB */

	case (FLASH_WORD_SIZE) AMD_ID_LV800B:
	info->flash_id += FLASH_AM800B;
	info->sector_count = 19;
	info->size = 0x00100000;
	break; /* => 1 MB */

	case (FLASH_WORD_SIZE) AMD_ID_LV160T:
	info->flash_id += FLASH_AM160T;
	info->sector_count = 35;
	info->size = 0x00200000;
	break; /* => 2 MB */

	case (FLASH_WORD_SIZE) AMD_ID_LV160B:
	info->flash_id += FLASH_AM160B;
	info->sector_count = 35;
	info->size = 0x00200000;
	break; /* => 2 MB */

	case (FLASH_WORD_SIZE) SST_ID_xF800A:
	info->flash_id += FLASH_SST800A;
	info->sector_count = 16;
	info->size = 0x00100000;
	break; /* => 1 MB */

	case (FLASH_WORD_SIZE) SST_ID_xF160A:
	info->flash_id += FLASH_SST160A;
	info->sector_count = 32;
	info->size = 0x00200000;
	break; /* => 2 MB */

	case (FLASH_WORD_SIZE) AMD_ID_F040B:
	info->flash_id += FLASH_AM040;
	info->sector_count = 8;
	info->size = 0x00080000;
	break; /* => 0.5 MB */

	default:
	info->flash_id = FLASH_UNKNOWN;
	return (0); /* => no or unknown flash */

	}

	printf ("flash id %lx; sector count %x, size %lx\n", info->flash_id,
	info->sector_count, info->size);
	/* set up sector start address table */
	if (info->flash_id & FLASH_MAN_SST) {
	for (i = 0; i < info->sector_count; i++)
	info->start[i] = base + (i * 0x00010000);
	} else if (info->flash_id & FLASH_BTYPE) {
	/* set sector offsets for bottom boot block type */
	info->start[0] = base + 0x00000000;
	info->start[1] = base + 0x00004000;
	info->start[2] = base + 0x00006000;
	info->start[3] = base + 0x00008000;
	for (i = 4; i < info->sector_count; i++) {
	info->start[i] = base + (i * 0x00010000) - 0x00030000;
	}
	} else {
	/* set sector offsets for top boot block type */
	i = info->sector_count - 1;
	info->start[i--] = base + info->size - 0x00004000;
	info->start[i--] = base + info->size - 0x00006000;
	info->start[i--] = base + info->size - 0x00008000;
	for (; i >= 0; i--) {
	info->start[i] = base + i * 0x00010000;
	}
	}

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
	/* D0 = 1 if protected */
	addr2 = (volatile FLASH_WORD_SIZE *) (info->start[i]);
	if (info->flash_id & FLASH_MAN_SST)
	info->protect[i] = 0;
	else
	info->protect[i] = addr2[2] & 1;
	}

	/*
	* Prevent writes to uninitialized FLASH.
	*/
	if (info->flash_id != FLASH_UNKNOWN) {
	addr2 = (FLASH_WORD_SIZE *) info->start[0];
	addr2 = (FLASH_WORD_SIZE) 0x00F000F0; / reset bank */
	}

	return (info->size);
	}

	#endif


	int flash_erase (flash_info_t * info, int s_first, int s_last)
	{
	volatile FLASH_WORD_SIZE addr = (FLASH_WORD_SIZE ) (info->start[0]);
	int flag, prot, sect, l_sect;
	ulong start, now, last;
	unsigned char sh8b;

	if ((s_first < 0) \|\| (s_first > s_last)) {
	if (info->flash_id == FLASH_UNKNOWN) {
	printf ("- missing\n");
	} else {
	printf ("- no sectors to erase\n");
	}
	return 1;
	}

	if ((info->flash_id == FLASH_UNKNOWN) \|\|
	(info->flash_id > (FLASH_MAN_STM \| FLASH_AMD_COMP))) {
	printf ("Can't erase unknown flash type - aborted\n");
	return 1;
	}

	prot = 0;
	for (sect = s_first; sect <= s_last; ++sect) {
	if (info->protect[sect]) {
	prot++;
	}
	}

	if (prot) {
	printf ("- Warning: %d protected sectors will not be erased!\n", prot);
	} else {
	printf ("\n");
	}

	l_sect = -1;

	/* Check the ROM CS */
	if ((info->start[0] >= ROM_CS1_START)
	&& (info->start[0] < ROM_CS0_START))
	sh8b = 3;
	else
	sh8b = 0;

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts ();

	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE) 0x00550055;
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00800080;
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE) 0x00550055;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	addr = (FLASH_WORD_SIZE *) (info->start[0] + ((info->
	start
	[sect]
	-
	info->
	start
	[0]) <<
	sh8b));
	if (info->flash_id & FLASH_MAN_SST) {
	addr[ADDR0 << sh8b] =
	(FLASH_WORD_SIZE) 0x00AA00AA;
	addr[ADDR1 << sh8b] =
	(FLASH_WORD_SIZE) 0x00550055;
	addr[ADDR0 << sh8b] =
	(FLASH_WORD_SIZE) 0x00800080;
	addr[ADDR0 << sh8b] =
	(FLASH_WORD_SIZE) 0x00AA00AA;
	addr[ADDR1 << sh8b] =
	(FLASH_WORD_SIZE) 0x00550055;
	addr[0] = (FLASH_WORD_SIZE) 0x00500050; /* block erase */
	udelay (30000); /* wait 30 ms */
	} else
	addr[0] = (FLASH_WORD_SIZE) 0x00300030; /* sector erase */
	l_sect = sect;
	}
	}

	/* re-enable interrupts if necessary */
	if (flag)
	enable_interrupts ();

	/* wait at least 80us - let's wait 1 ms */
	udelay (1000);

	/*
	* We wait for the last triggered sector
	*/
	if (l_sect < 0)
	goto DONE;

	start = get_timer (0);
	last = start;
	addr = (FLASH_WORD_SIZE *) (info->start[0] + ((info->start[l_sect] -
	info->
	start[0]) << sh8b));
	while ((addr[0] & (FLASH_WORD_SIZE) 0x00800080) !=
	(FLASH_WORD_SIZE) 0x00800080) {
	if ((now = get_timer (start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
	printf ("Timeout\n");
	return 1;
	}
	/* show that we're waiting */
	if ((now - last) > 1000) { /* every second */
	serial_putc ('.');
	last = now;
	}
	}

	DONE:
	/* reset to read mode */
	addr = (FLASH_WORD_SIZE *) info->start[0];
	addr[0] = (FLASH_WORD_SIZE) 0x00F000F0; /* reset bank */

	printf (" done\n");
	return 0;
	}

	/*-----------------------------------------------------------------------
	* Copy memory to flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/

	int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
	{
	ulong cp, wp, data;
	int i, l, rc;

	wp = (addr & ~3); /* get lower word aligned address */

	/*
	* handle unaligned start bytes
	*/
	if ((l = addr - wp) != 0) {
	data = 0;
	for (i = 0, cp = wp; i < l; ++i, ++cp) {
	data = (data << 8) \| ((uchar ) cp);
	}
	for (; i < 4 && cnt > 0; ++i) {
	data = (data << 8) \| *src++;
	--cnt;
	++cp;
	}
	for (; cnt == 0 && i < 4; ++i, ++cp) {
	data = (data << 8) \| ((uchar ) cp);
	}

	if ((rc = write_word (info, wp, data)) != 0) {
	return (rc);
	}
	wp += 4;
	}

	/*
	* handle word aligned part
	*/
	while (cnt >= 4) {
	data = 0;
	for (i = 0; i < 4; ++i) {
	data = (data << 8) \| *src++;
	}
	if ((rc = write_word (info, wp, data)) != 0) {
	return (rc);
	}
	wp += 4;
	cnt -= 4;
	}

	if (cnt == 0) {
	return (0);
	}

	/*
	* handle unaligned tail bytes
	*/
	data = 0;
	for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
	data = (data << 8) \| *src++;
	--cnt;
	}
	for (; i < 4; ++i, ++cp) {
	data = (data << 8) \| ((uchar ) cp);
	}

	return (write_word (info, wp, data));
	}

	/*-----------------------------------------------------------------------
	* Write a word to Flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	static int write_word (flash_info_t * info, ulong dest, ulong data)
	{
	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE ) info->start[0];
	volatile FLASH_WORD_SIZE *dest2;
	volatile FLASH_WORD_SIZE data2 = (FLASH_WORD_SIZE ) & data;
	ulong start;
	int flag;
	int i;
	unsigned char sh8b;

	/* Check the ROM CS */
	if ((info->start[0] >= ROM_CS1_START)
	&& (info->start[0] < ROM_CS0_START))
	sh8b = 3;
	else
	sh8b = 0;

	dest2 = (FLASH_WORD_SIZE *) (((dest - info->start[0]) << sh8b) +
	info->start[0]);

	/* Check if Flash is (sufficiently) erased */
	if ((*dest2 & (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
	return (2);
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts ();

	for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
	addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE) 0x00550055;
	addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE) 0x00A000A0;

	dest2[i << sh8b] = data2[i];

	/* re-enable interrupts if necessary */
	if (flag)
	enable_interrupts ();

	/* data polling for D7 */
	start = get_timer (0);
	while ((dest2[i << sh8b] & (FLASH_WORD_SIZE) 0x00800080) !=
	(data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {
	if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
	return (1);
	}
	}
	}

	return (0);
	}

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