board/mx1fs2/flash.c - github/trini/u-boot - Gitiles

 /*
  * (C) 2000-2004 Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  * (C) 2003 August Hoeraendl, Logotronic GmbH
  *
  * 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
  */

 #undef CONFIG_FLASH_16BIT

 #include <common.h>

 #define FLASH_BANK_SIZE MX1FS2_FLASH_BANK_SIZE
 #define MAIN_SECT_SIZE  MX1FS2_FLASH_SECT_SIZE

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

 /*
  * NOTE - CONFIG_FLASH_16BIT means the CPU interface is 16-bit, it
  *        has nothing to do with the flash chip being 8-bit or 16-bit.
  */
 #ifdef CONFIG_FLASH_16BIT
 typedef unsigned short FLASH_PORT_WIDTH;
 typedef volatile unsigned short FLASH_PORT_WIDTHV;

 #define	FLASH_ID_MASK	0xFFFF
 #else
 typedef unsigned long FLASH_PORT_WIDTH;
 typedef volatile unsigned long FLASH_PORT_WIDTHV;

 #define	FLASH_ID_MASK	0xFFFFFFFF
 #endif

 #define FPW	FLASH_PORT_WIDTH
 #define FPWV	FLASH_PORT_WIDTHV

 #define ORMASK(size) ((-size) & OR_AM_MSK)

 /*-----------------------------------------------------------------------
  * Functions
  */
 #if 0
 static ulong flash_get_size(FPWV * addr, flash_info_t * info);
 static void flash_get_offsets(ulong base, flash_info_t * info);
 #endif
 static void flash_reset(flash_info_t * info);
 static int write_word_intel(flash_info_t * info, FPWV * dest, FPW data);
 static int write_word_amd(flash_info_t * info, FPWV * dest, FPW data);
 #define write_word(in, de, da)   write_word_amd(in, de, da)
 #ifdef CFG_FLASH_PROTECTION
 static void flash_sync_real_protect(flash_info_t * info);
 #endif

 /*-----------------------------------------------------------------------
  * flash_init()
  *
  * sets up flash_info and returns size of FLASH (bytes)
  */
 ulong
 flash_init(void)
 {
 	int i, j;
 	ulong size = 0;

 	for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
 		ulong flashbase = 0;
 		flash_info[i].flash_id =
 		    (FLASH_MAN_AMD & FLASH_VENDMASK) |
 		    (FLASH_AM640U & FLASH_TYPEMASK);
 		flash_info[i].size = FLASH_BANK_SIZE;
 		flash_info[i].sector_count = CFG_MAX_FLASH_SECT;
 		memset(flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
 		switch (i) {
 		case 0:
 			flashbase = MX1FS2_FLASH_BASE;
 			break;
 		default:
 			panic("configured too many flash banks!\n");
 			break;
 		}
 		for (j = 0; j < flash_info[i].sector_count; j++) {
 			flash_info[i].start[j] = flashbase + j * MAIN_SECT_SIZE;
 		}
 		size += flash_info[i].size;
 	}

 	/* Protect monitor and environment sectors */
 	flash_protect(FLAG_PROTECT_SET,
 		      CFG_FLASH_BASE,
 		      CFG_FLASH_BASE + _bss_start - _armboot_start,
 		      &flash_info[0]);

 	flash_protect(FLAG_PROTECT_SET,
 		      CFG_ENV_ADDR,
 		      CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0]);

 	return size;
 }

 /*-----------------------------------------------------------------------
  */
 static void
 flash_reset(flash_info_t * info)
 {
 	FPWV *base = (FPWV *) (info->start[0]);

 	/* Put FLASH back in read mode */
 	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)
 		*base = (FPW) 0x00FF00FF;	/* Intel Read Mode */
 	else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD)
 		*base = (FPW) 0x00F000F0;	/* AMD Read Mode */
 }

 /*-----------------------------------------------------------------------
  */
 #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_VENDMASK) == FLASH_MAN_INTEL
 	    && (info->flash_id & FLASH_BTYPE)) {
 		int bootsect_size;	/* number of bytes/boot sector  */
 		int sect_size;	/* number of bytes/regular sector */

 		bootsect_size = 0x00002000 * (sizeof (FPW) / 2);
 		sect_size = 0x00010000 * (sizeof (FPW) / 2);

 		/* set sector offsets for bottom boot block type        */
 		for (i = 0; i < 8; ++i) {
 			info->start[i] = base + (i * bootsect_size);
 		}
 		for (i = 8; i < info->sector_count; i++) {
 			info->start[i] = base + ((i - 7) * sect_size);
 		}
 	} else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD
 		   && (info->flash_id & FLASH_TYPEMASK) == FLASH_AM640U) {

 		int sect_size;	/* number of bytes/sector */

 		sect_size = 0x00010000 * (sizeof (FPW) / 2);

 		/* set up sector start address table (uniform sector type) */
 		for (i = 0; i < info->sector_count; i++)
 			info->start[i] = base + (i * sect_size);
 	}
 }
 #endif /* 0 */

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

 void
 flash_print_info(flash_info_t * info)
 {
 	int i;
 	uchar *boottype;
 	uchar *bootletter;
 	uchar *fmt;
 	uchar botbootletter[] = "B";
 	uchar topbootletter[] = "T";
 	uchar botboottype[] = "bottom boot sector";
 	uchar topboottype[] = "top boot sector";

 	if (info->flash_id == FLASH_UNKNOWN) {
 		printf("missing or unknown FLASH type\n");
 		return;
 	}

 	switch (info->flash_id & FLASH_VENDMASK) {
 	case FLASH_MAN_AMD:
 		printf("AMD ");
 		break;
 	case FLASH_MAN_BM:
 		printf("BRIGHT MICRO ");
 		break;
 	case FLASH_MAN_FUJ:
 		printf("FUJITSU ");
 		break;
 	case FLASH_MAN_SST:
 		printf("SST ");
 		break;
 	case FLASH_MAN_STM:
 		printf("STM ");
 		break;
 	case FLASH_MAN_INTEL:
 		printf("INTEL ");
 		break;
 	default:
 		printf("Unknown Vendor ");
 		break;
 	}

 	/* check for top or bottom boot, if it applies */
 	if (info->flash_id & FLASH_BTYPE) {
 		boottype = botboottype;
 		bootletter = botbootletter;
 	} else {
 		boottype = topboottype;
 		bootletter = topbootletter;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AM640U:
 		fmt = "29LV641D (64 Mbit, uniform sectors)\n";
 		break;
 	case FLASH_28F800C3B:
 	case FLASH_28F800C3T:
 		fmt = "28F800C3%s (8 Mbit, %s)\n";
 		break;
 	case FLASH_INTEL800B:
 	case FLASH_INTEL800T:
 		fmt = "28F800B3%s (8 Mbit, %s)\n";
 		break;
 	case FLASH_28F160C3B:
 	case FLASH_28F160C3T:
 		fmt = "28F160C3%s (16 Mbit, %s)\n";
 		break;
 	case FLASH_INTEL160B:
 	case FLASH_INTEL160T:
 		fmt = "28F160B3%s (16 Mbit, %s)\n";
 		break;
 	case FLASH_28F320C3B:
 	case FLASH_28F320C3T:
 		fmt = "28F320C3%s (32 Mbit, %s)\n";
 		break;
 	case FLASH_INTEL320B:
 	case FLASH_INTEL320T:
 		fmt = "28F320B3%s (32 Mbit, %s)\n";
 		break;
 	case FLASH_28F640C3B:
 	case FLASH_28F640C3T:
 		fmt = "28F640C3%s (64 Mbit, %s)\n";
 		break;
 	case FLASH_INTEL640B:
 	case FLASH_INTEL640T:
 		fmt = "28F640B3%s (64 Mbit, %s)\n";
 		break;
 	default:
 		fmt = "Unknown Chip Type\n";
 		break;
 	}

 	printf(fmt, bootletter, boottype);

 	printf("  Size: %ld MB in %d Sectors\n",
 	       info->size >> 20, info->sector_count);

 	printf("  Sector Start Addresses:");

 	for (i = 0; i < info->sector_count; ++i) {
 		if ((i % 5) == 0) {
 			printf("\n   ");
 		}

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

 	printf("\n");
 }

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

 /*
  * The following code cannot be run from FLASH!
  */

 #if 0
 ulong
 flash_get_size(FPWV * addr, flash_info_t * info)
 {
 	/* Write auto select command: read Manufacturer ID */

 	/* Write auto select command sequence and test FLASH answer */
 	addr[0x0555] = (FPW) 0x00AA00AA;	/* for AMD, Intel ignores this */
 	addr[0x02AA] = (FPW) 0x00550055;	/* for AMD, Intel ignores this */
 	addr[0x0555] = (FPW) 0x00900090;	/* selects Intel or AMD */

 	/* The manufacturer codes are only 1 byte, so just use 1 byte.
 	 * This works for any bus width and any FLASH device width.
 	 */
 	switch (addr[0] & 0xff) {

 	case (uchar) AMD_MANUFACT:
 		info->flash_id = FLASH_MAN_AMD;
 		break;

 	case (uchar) INTEL_MANUFACT:
 		info->flash_id = FLASH_MAN_INTEL;
 		break;

 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0;
 		break;
 	}

 	/* Check 16 bits or 32 bits of ID so work on 32 or 16 bit bus. */
 	if (info->flash_id != FLASH_UNKNOWN)
 		switch (addr[1]) {

 		case (FPW) AMD_ID_LV640U:	/* 29LV640 and 29LV641 have same ID */
 			info->flash_id += FLASH_AM640U;
 			info->sector_count = 128;
 			info->size = 0x00800000 * (sizeof (FPW) / 2);
 			break;	/* => 8 or 16 MB        */

 		case (FPW) INTEL_ID_28F800C3B:
 			info->flash_id += FLASH_28F800C3B;
 			info->sector_count = 23;
 			info->size = 0x00100000 * (sizeof (FPW) / 2);
 			break;	/* => 1 or 2 MB         */

 		case (FPW) INTEL_ID_28F800B3B:
 			info->flash_id += FLASH_INTEL800B;
 			info->sector_count = 23;
 			info->size = 0x00100000 * (sizeof (FPW) / 2);
 			break;	/* => 1 or 2 MB         */

 		case (FPW) INTEL_ID_28F160C3B:
 			info->flash_id += FLASH_28F160C3B;
 			info->sector_count = 39;
 			info->size = 0x00200000 * (sizeof (FPW) / 2);
 			break;	/* => 2 or 4 MB         */

 		case (FPW) INTEL_ID_28F160B3B:
 			info->flash_id += FLASH_INTEL160B;
 			info->sector_count = 39;
 			info->size = 0x00200000 * (sizeof (FPW) / 2);
 			break;	/* => 2 or 4 MB         */

 		case (FPW) INTEL_ID_28F320C3B:
 			info->flash_id += FLASH_28F320C3B;
 			info->sector_count = 71;
 			info->size = 0x00400000 * (sizeof (FPW) / 2);
 			break;	/* => 4 or 8 MB         */

 		case (FPW) INTEL_ID_28F320B3B:
 			info->flash_id += FLASH_INTEL320B;
 			info->sector_count = 71;
 			info->size = 0x00400000 * (sizeof (FPW) / 2);
 			break;	/* => 4 or 8 MB         */

 		case (FPW) INTEL_ID_28F640C3B:
 			info->flash_id += FLASH_28F640C3B;
 			info->sector_count = 135;
 			info->size = 0x00800000 * (sizeof (FPW) / 2);
 			break;	/* => 8 or 16 MB        */

 		case (FPW) INTEL_ID_28F640B3B:
 			info->flash_id += FLASH_INTEL640B;
 			info->sector_count = 135;
 			info->size = 0x00800000 * (sizeof (FPW) / 2);
 			break;	/* => 8 or 16 MB        */

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

 	flash_get_offsets((ulong) addr, info);

 	/* Put FLASH back in read mode */
 	flash_reset(info);

 	return (info->size);
 }
 #endif /* 0 */

 #ifdef CFG_FLASH_PROTECTION
 /*-----------------------------------------------------------------------
  */

 static void
 flash_sync_real_protect(flash_info_t * info)
 {
 	FPWV *addr = (FPWV *) (info->start[0]);
 	FPWV *sect;
 	int i;

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_28F800C3B:
 	case FLASH_28F800C3T:
 	case FLASH_28F160C3B:
 	case FLASH_28F160C3T:
 	case FLASH_28F320C3B:
 	case FLASH_28F320C3T:
 	case FLASH_28F640C3B:
 	case FLASH_28F640C3T:
 		/* check for protected sectors */
 		*addr = (FPW) 0x00900090;
 		for (i = 0; i < info->sector_count; i++) {
 			/* read sector protection at sector address, (A7 .. A0) = 0x02.
 			 * D0 = 1 for each device if protected.
 			 * If at least one device is protected the sector is marked
 			 * protected, but mixed protected and  unprotected devices
 			 * within a sector should never happen.
 			 */
 			sect = (FPWV *) (info->start[i]);
 			info->protect[i] =
 			    (sect[2] & (FPW) (0x00010001)) ? 1 : 0;
 		}

 		/* Put FLASH back in read mode */
 		flash_reset(info);
 		break;

 	case FLASH_AM640U:
 	default:
 		/* no hardware protect that we support */
 		break;
 	}
 }
 #endif

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

 int
 flash_erase(flash_info_t * info, int s_first, int s_last)
 {
 	FPWV *addr;
 	int flag, prot, sect;
 	int intel = (info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL;
 	ulong start, now, last;
 	int rcode = 0;

 	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;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_INTEL800B:
 	case FLASH_INTEL160B:
 	case FLASH_INTEL320B:
 	case FLASH_INTEL640B:
 	case FLASH_28F800C3B:
 	case FLASH_28F160C3B:
 	case FLASH_28F320C3B:
 	case FLASH_28F640C3B:
 	case FLASH_AM640U:
 		break;
 	case FLASH_UNKNOWN:
 	default:
 		printf("Can't erase unknown flash type %08lx - aborted\n",
 		       info->flash_id);
 		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");
 	}

 	start = get_timer(0);
 	last = start;

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect <= s_last && rcode == 0; sect++) {

 		if (info->protect[sect] != 0)	/* protected, skip it */
 			continue;

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

 		addr = (FPWV *) (info->start[sect]);
 		if (intel) {
 			*addr = (FPW) 0x00500050;	/* clear status register */
 			*addr = (FPW) 0x00200020;	/* erase setup */
 			*addr = (FPW) 0x00D000D0;	/* erase confirm */
 		} else {
 			/* must be AMD style if not Intel */
 			FPWV *base;	/* first address in bank */

 			base = (FPWV *) (info->start[0]);
 			base[0x0555] = (FPW) 0x00AA00AA;	/* unlock */
 			base[0x02AA] = (FPW) 0x00550055;	/* unlock */
 			base[0x0555] = (FPW) 0x00800080;	/* erase mode */
 			base[0x0555] = (FPW) 0x00AA00AA;	/* unlock */
 			base[0x02AA] = (FPW) 0x00550055;	/* unlock */
 			*addr = (FPW) 0x00300030;	/* erase sector */
 		}

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

 		/* wait at least 50us for AMD, 80us for Intel.
 		 * Let's wait 1 ms.
 		 */
 		udelay(1000);

 		while ((*addr & (FPW) 0x00800080) != (FPW) 0x00800080) {
 			if ((now = get_timer(0)) - start > CFG_FLASH_ERASE_TOUT) {
 				printf("Timeout\n");

 				if (intel) {
 					/* suspend erase        */
 					*addr = (FPW) 0x00B000B0;
 				}

 				flash_reset(info);	/* reset to read mode */
 				rcode = 1;	/* failed */
 				break;
 			}

 			/* show that we're waiting */
 			if ((now - last) > 1000) {	/* every second */
 				putc('.');
 				last = now;
 			}
 		}

 		flash_reset(info);	/* reset to read mode   */
 	}

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

 /*-----------------------------------------------------------------------
  * Copy memory to flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 int
 bad_write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 {
 	FPW data = 0;		/* 16 or 32 bit word, matches flash bus width on MPC8XX */
 	int bytes;		/* number of bytes to program in current word         */
 	int left;		/* number of bytes left to program                    */
 	int i, res;

 	for (left = cnt, res = 0;
 	     left > 0 && res == 0;
 	     addr += sizeof (data), left -= sizeof (data) - bytes) {

 		bytes = addr & (sizeof (data) - 1);
 		addr &= ~(sizeof (data) - 1);

 		/* combine source and destination data so can program
 		 * an entire word of 16 or 32 bits
 		 */
 		for (i = 0; i < sizeof (data); i++) {
 			data <<= 8;
 			if (i < bytes || i - bytes >= left)
 				data += *((uchar *) addr + i);
 			else
 				data += *src++;
 		}

 		/* write one word to the flash */
 		switch (info->flash_id & FLASH_VENDMASK) {
 		case FLASH_MAN_AMD:
 			res = write_word_amd(info, (FPWV *) addr, data);
 			break;
 		case FLASH_MAN_INTEL:
 			res = write_word_intel(info, (FPWV *) addr, data);
 			break;
 		default:
 			/* unknown flash type, error! */
 			printf("missing or unknown FLASH type\n");
 			res = 1;	/* not really a timeout, but gives error */
 			break;
 		}
 	}

 	return (res);
 }

 /**
  * write_buf: - Copy memory to flash.
  *
  * @param info:
  * @param src:	source of copy transaction
  * @param addr:	where to copy to
  * @param cnt: 	number of bytes to copy
  *
  * @return	error code
  */

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

 	wp = (addr & ~1);	/* 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 << 8);
 		}
 		for (; i < 2 && cnt > 0; ++i) {
 			data = (data >> 8) | (*src++ << 8);
 			--cnt;
 			++cp;
 		}
 		for (; cnt == 0 && i < 2; ++i, ++cp) {
 			data = (data >> 8) | (*(uchar *) cp << 8);
 		}

 		if ((rc = write_word(info, (FPWV *)wp, data)) != 0) {
 			return (rc);
 		}
 		wp += 2;
 	}

 	/* handle word aligned part */
 	while (cnt >= 2) {
 		/* data = *((vushort*)src); */
 		data = *((FPW *) src);
 		if ((rc = write_word(info, (FPWV *)wp, data)) != 0) {
 			return (rc);
 		}
 		src += sizeof (FPW);
 		wp += sizeof (FPW);
 		cnt -= sizeof (FPW);
 	}

 	if (cnt == 0)
 		return ERR_OK;

 	/*
 	 * handle unaligned tail bytes
 	 */
 	data = 0;
 	for (i = 0, cp = wp; i < 2 && cnt > 0; ++i, ++cp) {
 		data = (data >> 8) | (*src++ << 8);
 		--cnt;
 	}
 	for (; i < 2; ++i, ++cp) {
 		data = (data >> 8) | (*(uchar *) cp << 8);
 	}

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

 /*-----------------------------------------------------------------------
  * Write a word to Flash for AMD FLASH
  * A word is 16 or 32 bits, whichever the bus width of the flash bank
  * (not an individual chip) is.
  *
  * returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 static int
 write_word_amd(flash_info_t * info, FPWV * dest, FPW data)
 {
 	ulong start;
 	int flag;
 	int res = 0;		/* result, assume success       */
 	FPWV *base;		/* first address in flash bank  */

 	/* Check if Flash is (sufficiently) erased */
 	if ((*dest & data) != data) {
 		return (2);
 	}

 	base = (FPWV *) (info->start[0]);
 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts();

 	base[0x0555] = (FPW) 0x00AA00AA;	/* unlock */
 	base[0x02AA] = (FPW) 0x00550055;	/* unlock */
 	base[0x0555] = (FPW) 0x00A000A0;	/* selects program mode */

 	*dest = data;		/* start programming the data   */

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

 	start = get_timer(0);

 	/* data polling for D7 */
 	while (res == 0
 	       && (*dest & (FPW) 0x00800080) != (data & (FPW) 0x00800080)) {
 		if (get_timer(0) - start > CFG_FLASH_WRITE_TOUT) {
 			*dest = (FPW) 0x00F000F0;	/* reset bank */
 			printf("SHA timeout\n");
 			res = 1;
 		}
 	}

 	return (res);
 }

 /*-----------------------------------------------------------------------
  * Write a word to Flash for Intel FLASH
  * A word is 16 or 32 bits, whichever the bus width of the flash bank
  * (not an individual chip) is.
  *
  * returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 static int
 write_word_intel(flash_info_t * info, FPWV * dest, FPW data)
 {
 	ulong start;
 	int flag;
 	int res = 0;		/* result, assume success       */

 	/* Check if Flash is (sufficiently) erased */
 	if ((*dest & data) != data) {
 		return (2);
 	}

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

 	*dest = (FPW) 0x00500050;	/* clear status register        */
 	*dest = (FPW) 0x00FF00FF;	/* make sure in read mode       */
 	*dest = (FPW) 0x00400040;	/* program setup                */

 	*dest = data;		/* start programming the data   */

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

 	start = get_timer(0);

 	while (res == 0 && (*dest & (FPW) 0x00800080) != (FPW) 0x00800080) {
 		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 			*dest = (FPW) 0x00B000B0;	/* Suspend program      */
 			res = 1;
 		}
 	}

 	if (res == 0 && (*dest & (FPW) 0x00100010))
 		res = 1;	/* write failed, time out error is close enough */

 	*dest = (FPW) 0x00500050;	/* clear status register        */
 	*dest = (FPW) 0x00FF00FF;	/* make sure in read mode       */

 	return (res);
 }

 #ifdef CFG_FLASH_PROTECTION
 /*-----------------------------------------------------------------------
  */
 int
 flash_real_protect(flash_info_t * info, long sector, int prot)
 {
 	int rcode = 0;		/* assume success */
 	FPWV *addr;		/* address of sector */
 	FPW value;

 	addr = (FPWV *) (info->start[sector]);

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_28F800C3B:
 	case FLASH_28F800C3T:
 	case FLASH_28F160C3B:
 	case FLASH_28F160C3T:
 	case FLASH_28F320C3B:
 	case FLASH_28F320C3T:
 	case FLASH_28F640C3B:
 	case FLASH_28F640C3T:
 		flash_reset(info);	/* make sure in read mode */
 		*addr = (FPW) 0x00600060L;	/* lock command setup */
 		if (prot)
 			*addr = (FPW) 0x00010001L;	/* lock sector */
 		else
 			*addr = (FPW) 0x00D000D0L;	/* unlock sector */
 		flash_reset(info);	/* reset to read mode */

 		/* now see if it really is locked/unlocked as requested */
 		*addr = (FPW) 0x00900090;
 		/* read sector protection at sector address, (A7 .. A0) = 0x02.
 		 * D0 = 1 for each device if protected.
 		 * If at least one device is protected the sector is marked
 		 * protected, but return failure. Mixed protected and
 		 * unprotected devices within a sector should never happen.
 		 */
 		value = addr[2] & (FPW) 0x00010001;
 		if (value == 0)
 			info->protect[sector] = 0;
 		else if (value == (FPW) 0x00010001)
 			info->protect[sector] = 1;
 		else {
 			/* error, mixed protected and unprotected */
 			rcode = 1;
 			info->protect[sector] = 1;
 		}
 		if (info->protect[sector] != prot)
 			rcode = 1;	/* failed to protect/unprotect as requested */

 		/* reload all protection bits from hardware for now */
 		flash_sync_real_protect(info);
 		break;

 	case FLASH_AM640U:
 	default:
 		/* no hardware protect that we support */
 		info->protect[sector] = prot;
 		break;
 	}

 	return rcode;
 }
 #endif
	/*
	* (C) 2000-2004 Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	* (C) 2003 August Hoeraendl, Logotronic GmbH
	*
	* 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
	*/

	#undef CONFIG_FLASH_16BIT

	#include <common.h>

	#define FLASH_BANK_SIZE MX1FS2_FLASH_BANK_SIZE
	#define MAIN_SECT_SIZE MX1FS2_FLASH_SECT_SIZE

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

	/*
	* NOTE - CONFIG_FLASH_16BIT means the CPU interface is 16-bit, it
	* has nothing to do with the flash chip being 8-bit or 16-bit.
	*/
	#ifdef CONFIG_FLASH_16BIT
	typedef unsigned short FLASH_PORT_WIDTH;
	typedef volatile unsigned short FLASH_PORT_WIDTHV;

	#define FLASH_ID_MASK 0xFFFF
	#else
	typedef unsigned long FLASH_PORT_WIDTH;
	typedef volatile unsigned long FLASH_PORT_WIDTHV;

	#define FLASH_ID_MASK 0xFFFFFFFF
	#endif

	#define FPW FLASH_PORT_WIDTH
	#define FPWV FLASH_PORT_WIDTHV

	#define ORMASK(size) ((-size) & OR_AM_MSK)

	/*-----------------------------------------------------------------------
	* Functions
	*/
	#if 0
	static ulong flash_get_size(FPWV * addr, flash_info_t * info);
	static void flash_get_offsets(ulong base, flash_info_t * info);
	#endif
	static void flash_reset(flash_info_t * info);
	static int write_word_intel(flash_info_t * info, FPWV * dest, FPW data);
	static int write_word_amd(flash_info_t * info, FPWV * dest, FPW data);
	#define write_word(in, de, da) write_word_amd(in, de, da)
	#ifdef CFG_FLASH_PROTECTION
	static void flash_sync_real_protect(flash_info_t * info);
	#endif

	/*-----------------------------------------------------------------------
	* flash_init()
	*
	* sets up flash_info and returns size of FLASH (bytes)
	*/
	ulong
	flash_init(void)
	{
	int i, j;
	ulong size = 0;

	for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
	ulong flashbase = 0;
	flash_info[i].flash_id =
	(FLASH_MAN_AMD & FLASH_VENDMASK) \|
	(FLASH_AM640U & FLASH_TYPEMASK);
	flash_info[i].size = FLASH_BANK_SIZE;
	flash_info[i].sector_count = CFG_MAX_FLASH_SECT;
	memset(flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
	switch (i) {
	case 0:
	flashbase = MX1FS2_FLASH_BASE;
	break;
	default:
	panic("configured too many flash banks!\n");
	break;
	}
	for (j = 0; j < flash_info[i].sector_count; j++) {
	flash_info[i].start[j] = flashbase + j * MAIN_SECT_SIZE;
	}
	size += flash_info[i].size;
	}

	/* Protect monitor and environment sectors */
	flash_protect(FLAG_PROTECT_SET,
	CFG_FLASH_BASE,
	CFG_FLASH_BASE + _bss_start - _armboot_start,
	&flash_info[0]);

	flash_protect(FLAG_PROTECT_SET,
	CFG_ENV_ADDR,
	CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0]);

	return size;
	}

	/*-----------------------------------------------------------------------
	*/
	static void
	flash_reset(flash_info_t * info)
	{
	FPWV base = (FPWV ) (info->start[0]);

	/* Put FLASH back in read mode */
	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)
	base = (FPW) 0x00FF00FF; / Intel Read Mode */
	else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD)
	base = (FPW) 0x00F000F0; / AMD Read Mode */
	}

	/*-----------------------------------------------------------------------
	*/
	#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_VENDMASK) == FLASH_MAN_INTEL
	&& (info->flash_id & FLASH_BTYPE)) {
	int bootsect_size; /* number of bytes/boot sector */
	int sect_size; /* number of bytes/regular sector */

	bootsect_size = 0x00002000 * (sizeof (FPW) / 2);
	sect_size = 0x00010000 * (sizeof (FPW) / 2);

	/* set sector offsets for bottom boot block type */
	for (i = 0; i < 8; ++i) {
	info->start[i] = base + (i * bootsect_size);
	}
	for (i = 8; i < info->sector_count; i++) {
	info->start[i] = base + ((i - 7) * sect_size);
	}
	} else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD
	&& (info->flash_id & FLASH_TYPEMASK) == FLASH_AM640U) {

	int sect_size; /* number of bytes/sector */

	sect_size = 0x00010000 * (sizeof (FPW) / 2);

	/* set up sector start address table (uniform sector type) */
	for (i = 0; i < info->sector_count; i++)
	info->start[i] = base + (i * sect_size);
	}
	}
	#endif /* 0 */

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

	void
	flash_print_info(flash_info_t * info)
	{
	int i;
	uchar *boottype;
	uchar *bootletter;
	uchar *fmt;
	uchar botbootletter[] = "B";
	uchar topbootletter[] = "T";
	uchar botboottype[] = "bottom boot sector";
	uchar topboottype[] = "top boot sector";

	if (info->flash_id == FLASH_UNKNOWN) {
	printf("missing or unknown FLASH type\n");
	return;
	}

	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_AMD:
	printf("AMD ");
	break;
	case FLASH_MAN_BM:
	printf("BRIGHT MICRO ");
	break;
	case FLASH_MAN_FUJ:
	printf("FUJITSU ");
	break;
	case FLASH_MAN_SST:
	printf("SST ");
	break;
	case FLASH_MAN_STM:
	printf("STM ");
	break;
	case FLASH_MAN_INTEL:
	printf("INTEL ");
	break;
	default:
	printf("Unknown Vendor ");
	break;
	}

	/* check for top or bottom boot, if it applies */
	if (info->flash_id & FLASH_BTYPE) {
	boottype = botboottype;
	bootletter = botbootletter;
	} else {
	boottype = topboottype;
	bootletter = topbootletter;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM640U:
	fmt = "29LV641D (64 Mbit, uniform sectors)\n";
	break;
	case FLASH_28F800C3B:
	case FLASH_28F800C3T:
	fmt = "28F800C3%s (8 Mbit, %s)\n";
	break;
	case FLASH_INTEL800B:
	case FLASH_INTEL800T:
	fmt = "28F800B3%s (8 Mbit, %s)\n";
	break;
	case FLASH_28F160C3B:
	case FLASH_28F160C3T:
	fmt = "28F160C3%s (16 Mbit, %s)\n";
	break;
	case FLASH_INTEL160B:
	case FLASH_INTEL160T:
	fmt = "28F160B3%s (16 Mbit, %s)\n";
	break;
	case FLASH_28F320C3B:
	case FLASH_28F320C3T:
	fmt = "28F320C3%s (32 Mbit, %s)\n";
	break;
	case FLASH_INTEL320B:
	case FLASH_INTEL320T:
	fmt = "28F320B3%s (32 Mbit, %s)\n";
	break;
	case FLASH_28F640C3B:
	case FLASH_28F640C3T:
	fmt = "28F640C3%s (64 Mbit, %s)\n";
	break;
	case FLASH_INTEL640B:
	case FLASH_INTEL640T:
	fmt = "28F640B3%s (64 Mbit, %s)\n";
	break;
	default:
	fmt = "Unknown Chip Type\n";
	break;
	}

	printf(fmt, bootletter, boottype);

	printf(" Size: %ld MB in %d Sectors\n",
	info->size >> 20, info->sector_count);

	printf(" Sector Start Addresses:");

	for (i = 0; i < info->sector_count; ++i) {
	if ((i % 5) == 0) {
	printf("\n ");
	}

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

	printf("\n");
	}

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

	/*
	* The following code cannot be run from FLASH!
	*/

	#if 0
	ulong
	flash_get_size(FPWV * addr, flash_info_t * info)
	{
	/* Write auto select command: read Manufacturer ID */

	/* Write auto select command sequence and test FLASH answer */
	addr[0x0555] = (FPW) 0x00AA00AA; /* for AMD, Intel ignores this */
	addr[0x02AA] = (FPW) 0x00550055; /* for AMD, Intel ignores this */
	addr[0x0555] = (FPW) 0x00900090; /* selects Intel or AMD */

	/* The manufacturer codes are only 1 byte, so just use 1 byte.
	* This works for any bus width and any FLASH device width.
	*/
	switch (addr[0] & 0xff) {

	case (uchar) AMD_MANUFACT:
	info->flash_id = FLASH_MAN_AMD;
	break;

	case (uchar) INTEL_MANUFACT:
	info->flash_id = FLASH_MAN_INTEL;
	break;

	default:
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	break;
	}

	/* Check 16 bits or 32 bits of ID so work on 32 or 16 bit bus. */
	if (info->flash_id != FLASH_UNKNOWN)
	switch (addr[1]) {

	case (FPW) AMD_ID_LV640U: /* 29LV640 and 29LV641 have same ID */
	info->flash_id += FLASH_AM640U;
	info->sector_count = 128;
	info->size = 0x00800000 * (sizeof (FPW) / 2);
	break; /* => 8 or 16 MB */

	case (FPW) INTEL_ID_28F800C3B:
	info->flash_id += FLASH_28F800C3B;
	info->sector_count = 23;
	info->size = 0x00100000 * (sizeof (FPW) / 2);
	break; /* => 1 or 2 MB */

	case (FPW) INTEL_ID_28F800B3B:
	info->flash_id += FLASH_INTEL800B;
	info->sector_count = 23;
	info->size = 0x00100000 * (sizeof (FPW) / 2);
	break; /* => 1 or 2 MB */

	case (FPW) INTEL_ID_28F160C3B:
	info->flash_id += FLASH_28F160C3B;
	info->sector_count = 39;
	info->size = 0x00200000 * (sizeof (FPW) / 2);
	break; /* => 2 or 4 MB */

	case (FPW) INTEL_ID_28F160B3B:
	info->flash_id += FLASH_INTEL160B;
	info->sector_count = 39;
	info->size = 0x00200000 * (sizeof (FPW) / 2);
	break; /* => 2 or 4 MB */

	case (FPW) INTEL_ID_28F320C3B:
	info->flash_id += FLASH_28F320C3B;
	info->sector_count = 71;
	info->size = 0x00400000 * (sizeof (FPW) / 2);
	break; /* => 4 or 8 MB */

	case (FPW) INTEL_ID_28F320B3B:
	info->flash_id += FLASH_INTEL320B;
	info->sector_count = 71;
	info->size = 0x00400000 * (sizeof (FPW) / 2);
	break; /* => 4 or 8 MB */

	case (FPW) INTEL_ID_28F640C3B:
	info->flash_id += FLASH_28F640C3B;
	info->sector_count = 135;
	info->size = 0x00800000 * (sizeof (FPW) / 2);
	break; /* => 8 or 16 MB */

	case (FPW) INTEL_ID_28F640B3B:
	info->flash_id += FLASH_INTEL640B;
	info->sector_count = 135;
	info->size = 0x00800000 * (sizeof (FPW) / 2);
	break; /* => 8 or 16 MB */

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

	flash_get_offsets((ulong) addr, info);

	/* Put FLASH back in read mode */
	flash_reset(info);

	return (info->size);
	}
	#endif /* 0 */

	#ifdef CFG_FLASH_PROTECTION
	/*-----------------------------------------------------------------------
	*/

	static void
	flash_sync_real_protect(flash_info_t * info)
	{
	FPWV addr = (FPWV ) (info->start[0]);
	FPWV *sect;
	int i;

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F800C3B:
	case FLASH_28F800C3T:
	case FLASH_28F160C3B:
	case FLASH_28F160C3T:
	case FLASH_28F320C3B:
	case FLASH_28F320C3T:
	case FLASH_28F640C3B:
	case FLASH_28F640C3T:
	/* check for protected sectors */
	*addr = (FPW) 0x00900090;
	for (i = 0; i < info->sector_count; i++) {
	/* read sector protection at sector address, (A7 .. A0) = 0x02.
	* D0 = 1 for each device if protected.
	* If at least one device is protected the sector is marked
	* protected, but mixed protected and unprotected devices
	* within a sector should never happen.
	*/
	sect = (FPWV *) (info->start[i]);
	info->protect[i] =
	(sect[2] & (FPW) (0x00010001)) ? 1 : 0;
	}

	/* Put FLASH back in read mode */
	flash_reset(info);
	break;

	case FLASH_AM640U:
	default:
	/* no hardware protect that we support */
	break;
	}
	}
	#endif

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

	int
	flash_erase(flash_info_t * info, int s_first, int s_last)
	{
	FPWV *addr;
	int flag, prot, sect;
	int intel = (info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL;
	ulong start, now, last;
	int rcode = 0;

	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;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_INTEL800B:
	case FLASH_INTEL160B:
	case FLASH_INTEL320B:
	case FLASH_INTEL640B:
	case FLASH_28F800C3B:
	case FLASH_28F160C3B:
	case FLASH_28F320C3B:
	case FLASH_28F640C3B:
	case FLASH_AM640U:
	break;
	case FLASH_UNKNOWN:
	default:
	printf("Can't erase unknown flash type %08lx - aborted\n",
	info->flash_id);
	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");
	}

	start = get_timer(0);
	last = start;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last && rcode == 0; sect++) {

	if (info->protect[sect] != 0) /* protected, skip it */
	continue;

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

	addr = (FPWV *) (info->start[sect]);
	if (intel) {
	addr = (FPW) 0x00500050; / clear status register */
	addr = (FPW) 0x00200020; / erase setup */
	addr = (FPW) 0x00D000D0; / erase confirm */
	} else {
	/* must be AMD style if not Intel */
	FPWV base; / first address in bank */

	base = (FPWV *) (info->start[0]);
	base[0x0555] = (FPW) 0x00AA00AA; /* unlock */
	base[0x02AA] = (FPW) 0x00550055; /* unlock */
	base[0x0555] = (FPW) 0x00800080; /* erase mode */
	base[0x0555] = (FPW) 0x00AA00AA; /* unlock */
	base[0x02AA] = (FPW) 0x00550055; /* unlock */
	addr = (FPW) 0x00300030; / erase sector */
	}

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

	/* wait at least 50us for AMD, 80us for Intel.
	* Let's wait 1 ms.
	*/
	udelay(1000);

	while ((*addr & (FPW) 0x00800080) != (FPW) 0x00800080) {
	if ((now = get_timer(0)) - start > CFG_FLASH_ERASE_TOUT) {
	printf("Timeout\n");

	if (intel) {
	/* suspend erase */
	*addr = (FPW) 0x00B000B0;
	}

	flash_reset(info); /* reset to read mode */
	rcode = 1; /* failed */
	break;
	}

	/* show that we're waiting */
	if ((now - last) > 1000) { /* every second */
	putc('.');
	last = now;
	}
	}

	flash_reset(info); /* reset to read mode */
	}

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

	/*-----------------------------------------------------------------------
	* Copy memory to flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	int
	bad_write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
	{
	FPW data = 0; /* 16 or 32 bit word, matches flash bus width on MPC8XX */
	int bytes; /* number of bytes to program in current word */
	int left; /* number of bytes left to program */
	int i, res;

	for (left = cnt, res = 0;
	left > 0 && res == 0;
	addr += sizeof (data), left -= sizeof (data) - bytes) {

	bytes = addr & (sizeof (data) - 1);
	addr &= ~(sizeof (data) - 1);

	/* combine source and destination data so can program
	* an entire word of 16 or 32 bits
	*/
	for (i = 0; i < sizeof (data); i++) {
	data <<= 8;
	if (i < bytes \|\| i - bytes >= left)
	data += ((uchar ) addr + i);
	else
	data += *src++;
	}

	/* write one word to the flash */
	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_AMD:
	res = write_word_amd(info, (FPWV *) addr, data);
	break;
	case FLASH_MAN_INTEL:
	res = write_word_intel(info, (FPWV *) addr, data);
	break;
	default:
	/* unknown flash type, error! */
	printf("missing or unknown FLASH type\n");
	res = 1; /* not really a timeout, but gives error */
	break;
	}
	}

	return (res);
	}

	/**
	* write_buf: - Copy memory to flash.
	*
	* @param info:
	* @param src: source of copy transaction
	* @param addr: where to copy to
	* @param cnt: number of bytes to copy
	*
	* @return error code
	*/

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

	wp = (addr & ~1); /* 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 << 8);
	}
	for (; i < 2 && cnt > 0; ++i) {
	data = (data >> 8) \| (*src++ << 8);
	--cnt;
	++cp;
	}
	for (; cnt == 0 && i < 2; ++i, ++cp) {
	data = (data >> 8) \| ((uchar ) cp << 8);
	}

	if ((rc = write_word(info, (FPWV *)wp, data)) != 0) {
	return (rc);
	}
	wp += 2;
	}

	/* handle word aligned part */
	while (cnt >= 2) {
	/* data = ((vushort)src); */
	data = ((FPW ) src);
	if ((rc = write_word(info, (FPWV *)wp, data)) != 0) {
	return (rc);
	}
	src += sizeof (FPW);
	wp += sizeof (FPW);
	cnt -= sizeof (FPW);
	}

	if (cnt == 0)
	return ERR_OK;

	/*
	* handle unaligned tail bytes
	*/
	data = 0;
	for (i = 0, cp = wp; i < 2 && cnt > 0; ++i, ++cp) {
	data = (data >> 8) \| (*src++ << 8);
	--cnt;
	}
	for (; i < 2; ++i, ++cp) {
	data = (data >> 8) \| ((uchar ) cp << 8);
	}

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

	/*-----------------------------------------------------------------------
	* Write a word to Flash for AMD FLASH
	* A word is 16 or 32 bits, whichever the bus width of the flash bank
	* (not an individual chip) is.
	*
	* returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	static int
	write_word_amd(flash_info_t * info, FPWV * dest, FPW data)
	{
	ulong start;
	int flag;
	int res = 0; /* result, assume success */
	FPWV base; / first address in flash bank */

	/* Check if Flash is (sufficiently) erased */
	if ((*dest & data) != data) {
	return (2);
	}

	base = (FPWV *) (info->start[0]);
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	base[0x0555] = (FPW) 0x00AA00AA; /* unlock */
	base[0x02AA] = (FPW) 0x00550055; /* unlock */
	base[0x0555] = (FPW) 0x00A000A0; /* selects program mode */

	dest = data; / start programming the data */

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

	start = get_timer(0);

	/* data polling for D7 */
	while (res == 0
	&& (*dest & (FPW) 0x00800080) != (data & (FPW) 0x00800080)) {
	if (get_timer(0) - start > CFG_FLASH_WRITE_TOUT) {
	dest = (FPW) 0x00F000F0; / reset bank */
	printf("SHA timeout\n");
	res = 1;
	}
	}

	return (res);
	}

	/*-----------------------------------------------------------------------
	* Write a word to Flash for Intel FLASH
	* A word is 16 or 32 bits, whichever the bus width of the flash bank
	* (not an individual chip) is.
	*
	* returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	static int
	write_word_intel(flash_info_t * info, FPWV * dest, FPW data)
	{
	ulong start;
	int flag;
	int res = 0; /* result, assume success */

	/* Check if Flash is (sufficiently) erased */
	if ((*dest & data) != data) {
	return (2);
	}

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

	dest = (FPW) 0x00500050; / clear status register */
	dest = (FPW) 0x00FF00FF; / make sure in read mode */
	dest = (FPW) 0x00400040; / program setup */

	dest = data; / start programming the data */

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

	start = get_timer(0);

	while (res == 0 && (*dest & (FPW) 0x00800080) != (FPW) 0x00800080) {
	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
	dest = (FPW) 0x00B000B0; / Suspend program */
	res = 1;
	}
	}

	if (res == 0 && (*dest & (FPW) 0x00100010))
	res = 1; /* write failed, time out error is close enough */

	dest = (FPW) 0x00500050; / clear status register */
	dest = (FPW) 0x00FF00FF; / make sure in read mode */

	return (res);
	}

	#ifdef CFG_FLASH_PROTECTION
	/*-----------------------------------------------------------------------
	*/
	int
	flash_real_protect(flash_info_t * info, long sector, int prot)
	{
	int rcode = 0; /* assume success */
	FPWV addr; / address of sector */
	FPW value;

	addr = (FPWV *) (info->start[sector]);

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F800C3B:
	case FLASH_28F800C3T:
	case FLASH_28F160C3B:
	case FLASH_28F160C3T:
	case FLASH_28F320C3B:
	case FLASH_28F320C3T:
	case FLASH_28F640C3B:
	case FLASH_28F640C3T:
	flash_reset(info); /* make sure in read mode */
	addr = (FPW) 0x00600060L; / lock command setup */
	if (prot)
	addr = (FPW) 0x00010001L; / lock sector */
	else
	addr = (FPW) 0x00D000D0L; / unlock sector */
	flash_reset(info); /* reset to read mode */

	/* now see if it really is locked/unlocked as requested */
	*addr = (FPW) 0x00900090;
	/* read sector protection at sector address, (A7 .. A0) = 0x02.
	* D0 = 1 for each device if protected.
	* If at least one device is protected the sector is marked
	* protected, but return failure. Mixed protected and
	* unprotected devices within a sector should never happen.
	*/
	value = addr[2] & (FPW) 0x00010001;
	if (value == 0)
	info->protect[sector] = 0;
	else if (value == (FPW) 0x00010001)
	info->protect[sector] = 1;
	else {
	/* error, mixed protected and unprotected */
	rcode = 1;
	info->protect[sector] = 1;
	}
	if (info->protect[sector] != prot)
	rcode = 1; /* failed to protect/unprotect as requested */

	/* reload all protection bits from hardware for now */
	flash_sync_real_protect(info);
	break;

	case FLASH_AM640U:
	default:
	/* no hardware protect that we support */
	info->protect[sector] = prot;
	break;
	}

	return rcode;
	}
	#endif