board/stxgp3/flash.c - uboot/windcharger - Git at Google

 /*
  * (C) Copyright 2003, Dan Malek, Embedded Edge, LLC.  <dan@embeddededge.com>
  * Copied from ADS85xx.
  * Updated to support the Silicon Tx GP3 8560.  We should only find
  * two Intel 28F640 parts in 16-bit mode (i.e. 32-bit wide flash),
  * but I left other code here in case people order custom boards.
  *
  * (C) Copyright 2003 Motorola Inc.
  *  Xianghua Xiao,(X.Xiao@motorola.com)
  *
  * (C) Copyright 2000, 2001
  *  Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (C) Copyright 2001, Stuart Hughes, Lineo Inc, stuarth@lineo.com
  * Add support the Sharp chips on the mpc8260ads.
  * I started with board/ip860/flash.c and made changes I found in
  * the MTD project by David Schleef.
  *
  * 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>

 #if !defined(CFG_NO_FLASH)

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

 #if defined(CFG_ENV_IS_IN_FLASH)
 # ifndef  CFG_ENV_ADDR
 #  define CFG_ENV_ADDR	(CFG_FLASH_BASE + CFG_ENV_OFFSET)
 # endif
 # ifndef  CFG_ENV_SIZE
 #  define CFG_ENV_SIZE	CFG_ENV_SECT_SIZE
 # endif
 # ifndef  CFG_ENV_SECT_SIZE
 #  define CFG_ENV_SECT_SIZE  CFG_ENV_SIZE
 # endif
 #endif

 #undef DEBUG

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

 unsigned long flash_init (void)
 {
 	unsigned long size;
 	int i;

 	/* Init: enable write,
 	 * or we cannot even write flash commands
 	 */
 	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
 		flash_info[i].flash_id = FLASH_UNKNOWN;

 		/* set the default sector offset */
 	}

 	/* Static FLASH Bank configuration here - FIXME XXX */

 	size = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);

 	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
 		printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
 			size, size<<20);
 	}

 	/* Re-do sizing to get full correct info */
 	size = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);

 	flash_info[0].size = size;

 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
 	/* monitor protection ON by default */
 	flash_protect(FLAG_PROTECT_SET,
 		      CFG_MONITOR_BASE,
 		      CFG_MONITOR_BASE+monitor_flash_len-1,
 		      &flash_info[0]);

 #ifdef	CFG_ENV_IS_IN_FLASH
 	/* ENV protection ON by default */
 	flash_protect(FLAG_PROTECT_SET,
 		      CFG_ENV_ADDR,
 		      CFG_ENV_ADDR+CFG_ENV_SECT_SIZE-1,
 		      &flash_info[0]);
 #endif
 #endif
 	return (size);
 }

 /*-----------------------------------------------------------------------
  */
 void flash_print_info  (flash_info_t *info)
 {
 	int i;

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

 	switch (info->flash_id & FLASH_VENDMASK) {
 	case FLASH_MAN_INTEL:	printf ("Intel ");		break;
 	case FLASH_MAN_SHARP:   printf ("Sharp ");		break;
 	default:		printf ("Unknown Vendor ");	break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_28F640C3T:	printf ("28F640C3T (64 Mbit x 2, 128 x 128k)\n");
 				break;
 	default:		printf ("Unknown Chip Type\n");
 				break;
 	}

 	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!
  */

 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 {
 	short i;
 	ulong value;
 	ulong base = (ulong)addr;
 	ulong sector_offset;

 #ifdef DEBUG
 	printf("Check flash at 0x%08x\n",(uint)addr);
 #endif
 	/* Write "Intelligent Identifier" command: read Manufacturer ID */
 	*addr = 0x90909090;
 	udelay(20);
 	asm("sync");

 	value = addr[0] & 0x00FF00FF;

 #ifdef DEBUG
 	printf("manufacturer=0x%x\n",(uint)value);
 #endif
 	switch (value) {
 	case MT_MANUFACT:	/* SHARP, MT or => Intel */
 	case INTEL_ALT_MANU:
 		info->flash_id = FLASH_MAN_INTEL;
 		break;
 	default:
 		printf("unknown manufacturer: %x\n", (unsigned int)value);
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0;
 		return (0);			/* no or unknown flash	*/
 	}

 	value = addr[1];             /* device ID            */

 #ifdef DEBUG
 	printf("deviceID=0x%x\n",(uint)value);
 #endif
 	switch (value) {

 	case (INTEL_ID_28F640C3T):
 		info->flash_id += FLASH_28F640C3T;
 		info->sector_count = 135;
 		info->size = 0x01000000;
 		sector_offset = 0x20000;
 		break;				/* => 2x8 MB		*/

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

 	}

 	/* set up sector start address table
 	 * The first 127 blocks are large, the last 8 are small.
 	 */
 	for (i = 0; i < 127; i++) {
 		info->start[i] = base;
 		base += sector_offset;
 		/* Sectors are locked upon reset */
 		info->protect[i] = 0;
 	}
 	for (i = 127; i < 135; i++) {
 		info->start[i] = base;
 		base += 0x4000;
 		/* Sectors are locked upon reset */
 		info->protect[i] = 0;
 	}


 	/*
 	 * Prevent writes to uninitialized FLASH.
 	 */
 	if (info->flash_id != FLASH_UNKNOWN) {
 		addr = (vu_long *)info->start[0];
 		*addr = 0xFFFFFF;	/* reset bank to read array mode */
 		asm("sync");
 	}

 	return (info->size);
 }


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

 int	flash_erase (flash_info_t *info, int s_first, int s_last)
 {
 	int flag, prot, sect;
 	ulong start, now, last;

 	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_VENDMASK) != FLASH_MAN_INTEL)
 	     && ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_SHARP) ) {
 		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");
 	}

 #ifdef DEBUG
 	printf("\nFlash Erase:\n");
 #endif
 	/* Make Sure Block Lock Bit is not set. */
 	if(clear_block_lock_bit((vu_long *)(info->start[s_first]))){
 		return 1;
 	}

 	/* Start erase on unprotected sectors */
 #if defined(DEBUG)
 	printf("Begin to erase now,s_first=0x%x s_last=0x%x...\n",s_first,s_last);
 #endif
 	for (sect = s_first; sect<=s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			vu_long *addr = (vu_long *)(info->start[sect]);
 			asm("sync");

 			last = start = get_timer (0);

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

 			/* Reset Array */
 			*addr = 0xffffffff;
 			asm("sync");
 			/* Clear Status Register */
 			*addr = 0x50505050;
 			asm("sync");
 			/* Single Block Erase Command */
 			*addr = 0x20202020;
 			asm("sync");
 			/* Confirm */
 			*addr = 0xD0D0D0D0;
 			asm("sync");

 			if((info->flash_id & FLASH_TYPEMASK) != FLASH_LH28F016SCT) {
 			    /* Resume Command, as per errata update */
 			    *addr = 0xD0D0D0D0;
 			    asm("sync");
 			}

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

 			/* wait at least 80us - let's wait 1 ms */
 			udelay (1000);
 			while ((*addr & 0x00800080) != 0x00800080) {
 				if(*addr & 0x00200020){
 					printf("Error in Block Erase - Lock Bit may be set!\n");
 					printf("Status Register = 0x%X\n", (uint)*addr);
 					*addr = 0xFFFFFFFF;	/* reset bank */
 					asm("sync");
 					return 1;
 				}
 				if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 					printf ("Timeout\n");
 					*addr = 0xFFFFFFFF;	/* reset bank */
 					asm("sync");
 					return 1;
 				}
 				/* show that we're waiting */
 				if ((now - last) > 1000) {	/* every second */
 					putc ('.');
 					last = now;
 				}
 			}

 			/* reset to read mode */
 			*addr = 0xFFFFFFFF;
 			asm("sync");
 		}
 	}

 	printf ("flash erase 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)
 {
 	vu_long *addr = (vu_long *)dest;
 	ulong start, csr;
 	int flag;

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

 	/* Write Command */
 	*addr = 0x10101010;
 	asm("sync");

 	/* Write Data */
 	*addr = data;

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

 	/* data polling for D7 */
 	start = get_timer (0);
 	flag  = 0;

 	while (((csr = *addr) & 0x00800080) != 0x00800080) {
 		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 			flag = 1;
 			break;
 		}
 	}
 	if (csr & 0x40404040) {
 		printf ("CSR indicates write error (%08lx) at %08lx\n", csr, (ulong)addr);
 		flag = 1;
 	}

 	/* Clear Status Registers Command */
 	*addr = 0x50505050;
 	asm("sync");
 	/* Reset to read array mode */
 	*addr = 0xFFFFFFFF;
 	asm("sync");

 	return (flag);
 }

 /*-----------------------------------------------------------------------
  * Clear Block Lock Bit, returns:
  * 0 - OK
  * 1 - Timeout
  */

 static int clear_block_lock_bit(vu_long  * addr)
 {
 	ulong start, now;

 	/* Reset Array */
 	*addr = 0xffffffff;
 	asm("sync");
 	/* Clear Status Register */
 	*addr = 0x50505050;
 	asm("sync");

 	*addr = 0x60606060;
 	asm("sync");
 	*addr = 0xd0d0d0d0;
 	asm("sync");

 	start = get_timer (0);
 	while((*addr & 0x00800080) != 0x00800080){
 		if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 			printf ("Timeout on clearing Block Lock Bit\n");
 			*addr = 0xFFFFFFFF;	/* reset bank */
 			asm("sync");
 			return 1;
 		}
 	}
 	return 0;
 }

 #endif /* !CFG_NO_FLASH */
	/*
	* (C) Copyright 2003, Dan Malek, Embedded Edge, LLC. <dan@embeddededge.com>
	* Copied from ADS85xx.
	* Updated to support the Silicon Tx GP3 8560. We should only find
	* two Intel 28F640 parts in 16-bit mode (i.e. 32-bit wide flash),
	* but I left other code here in case people order custom boards.
	*
	* (C) Copyright 2003 Motorola Inc.
	* Xianghua Xiao,(X.Xiao@motorola.com)
	*
	* (C) Copyright 2000, 2001
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* (C) Copyright 2001, Stuart Hughes, Lineo Inc, stuarth@lineo.com
	* Add support the Sharp chips on the mpc8260ads.
	* I started with board/ip860/flash.c and made changes I found in
	* the MTD project by David Schleef.
	*
	* 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>

	#if !defined(CFG_NO_FLASH)

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

	#if defined(CFG_ENV_IS_IN_FLASH)
	# ifndef CFG_ENV_ADDR
	# define CFG_ENV_ADDR (CFG_FLASH_BASE + CFG_ENV_OFFSET)
	# endif
	# ifndef CFG_ENV_SIZE
	# define CFG_ENV_SIZE CFG_ENV_SECT_SIZE
	# endif
	# ifndef CFG_ENV_SECT_SIZE
	# define CFG_ENV_SECT_SIZE CFG_ENV_SIZE
	# endif
	#endif

	#undef DEBUG

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

	unsigned long flash_init (void)
	{
	unsigned long size;
	int i;

	/* Init: enable write,
	* or we cannot even write flash commands
	*/
	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
	flash_info[i].flash_id = FLASH_UNKNOWN;

	/* set the default sector offset */
	}

	/* Static FLASH Bank configuration here - FIXME XXX */

	size = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);

	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
	printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
	size, size<<20);
	}

	/* Re-do sizing to get full correct info */
	size = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);

	flash_info[0].size = size;

	#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	/* monitor protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
	CFG_MONITOR_BASE,
	CFG_MONITOR_BASE+monitor_flash_len-1,
	&flash_info[0]);

	#ifdef CFG_ENV_IS_IN_FLASH
	/* ENV protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
	CFG_ENV_ADDR,
	CFG_ENV_ADDR+CFG_ENV_SECT_SIZE-1,
	&flash_info[0]);
	#endif
	#endif
	return (size);
	}

	/*-----------------------------------------------------------------------
	*/
	void flash_print_info (flash_info_t *info)
	{
	int i;

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

	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_INTEL: printf ("Intel "); break;
	case FLASH_MAN_SHARP: printf ("Sharp "); break;
	default: printf ("Unknown Vendor "); break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F640C3T: printf ("28F640C3T (64 Mbit x 2, 128 x 128k)\n");
	break;
	default: printf ("Unknown Chip Type\n");
	break;
	}

	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!
	*/

	static ulong flash_get_size (vu_long addr, flash_info_t info)
	{
	short i;
	ulong value;
	ulong base = (ulong)addr;
	ulong sector_offset;

	#ifdef DEBUG
	printf("Check flash at 0x%08x\n",(uint)addr);
	#endif
	/* Write "Intelligent Identifier" command: read Manufacturer ID */
	*addr = 0x90909090;
	udelay(20);
	asm("sync");

	value = addr[0] & 0x00FF00FF;

	#ifdef DEBUG
	printf("manufacturer=0x%x\n",(uint)value);
	#endif
	switch (value) {
	case MT_MANUFACT: /* SHARP, MT or => Intel */
	case INTEL_ALT_MANU:
	info->flash_id = FLASH_MAN_INTEL;
	break;
	default:
	printf("unknown manufacturer: %x\n", (unsigned int)value);
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	return (0); /* no or unknown flash */
	}

	value = addr[1]; /* device ID */

	#ifdef DEBUG
	printf("deviceID=0x%x\n",(uint)value);
	#endif
	switch (value) {

	case (INTEL_ID_28F640C3T):
	info->flash_id += FLASH_28F640C3T;
	info->sector_count = 135;
	info->size = 0x01000000;
	sector_offset = 0x20000;
	break; /* => 2x8 MB */

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

	}

	/* set up sector start address table
	* The first 127 blocks are large, the last 8 are small.
	*/
	for (i = 0; i < 127; i++) {
	info->start[i] = base;
	base += sector_offset;
	/* Sectors are locked upon reset */
	info->protect[i] = 0;
	}
	for (i = 127; i < 135; i++) {
	info->start[i] = base;
	base += 0x4000;
	/* Sectors are locked upon reset */
	info->protect[i] = 0;
	}


	/*
	* Prevent writes to uninitialized FLASH.
	*/
	if (info->flash_id != FLASH_UNKNOWN) {
	addr = (vu_long *)info->start[0];
	addr = 0xFFFFFF; / reset bank to read array mode */
	asm("sync");
	}

	return (info->size);
	}


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

	int flash_erase (flash_info_t *info, int s_first, int s_last)
	{
	int flag, prot, sect;
	ulong start, now, last;

	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_VENDMASK) != FLASH_MAN_INTEL)
	&& ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_SHARP) ) {
	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");
	}

	#ifdef DEBUG
	printf("\nFlash Erase:\n");
	#endif
	/* Make Sure Block Lock Bit is not set. */
	if(clear_block_lock_bit((vu_long *)(info->start[s_first]))){
	return 1;
	}

	/* Start erase on unprotected sectors */
	#if defined(DEBUG)
	printf("Begin to erase now,s_first=0x%x s_last=0x%x...\n",s_first,s_last);
	#endif
	for (sect = s_first; sect<=s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	vu_long addr = (vu_long )(info->start[sect]);
	asm("sync");

	last = start = get_timer (0);

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

	/* Reset Array */
	*addr = 0xffffffff;
	asm("sync");
	/* Clear Status Register */
	*addr = 0x50505050;
	asm("sync");
	/* Single Block Erase Command */
	*addr = 0x20202020;
	asm("sync");
	/* Confirm */
	*addr = 0xD0D0D0D0;
	asm("sync");

	if((info->flash_id & FLASH_TYPEMASK) != FLASH_LH28F016SCT) {
	/* Resume Command, as per errata update */
	*addr = 0xD0D0D0D0;
	asm("sync");
	}

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

	/* wait at least 80us - let's wait 1 ms */
	udelay (1000);
	while ((*addr & 0x00800080) != 0x00800080) {
	if(*addr & 0x00200020){
	printf("Error in Block Erase - Lock Bit may be set!\n");
	printf("Status Register = 0x%X\n", (uint)*addr);
	addr = 0xFFFFFFFF; / reset bank */
	asm("sync");
	return 1;
	}
	if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
	printf ("Timeout\n");
	addr = 0xFFFFFFFF; / reset bank */
	asm("sync");
	return 1;
	}
	/* show that we're waiting */
	if ((now - last) > 1000) { /* every second */
	putc ('.');
	last = now;
	}
	}

	/* reset to read mode */
	*addr = 0xFFFFFFFF;
	asm("sync");
	}
	}

	printf ("flash erase 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)
	{
	vu_long addr = (vu_long )dest;
	ulong start, csr;
	int flag;

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

	/* Write Command */
	*addr = 0x10101010;
	asm("sync");

	/* Write Data */
	*addr = data;

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

	/* data polling for D7 */
	start = get_timer (0);
	flag = 0;

	while (((csr = *addr) & 0x00800080) != 0x00800080) {
	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
	flag = 1;
	break;
	}
	}
	if (csr & 0x40404040) {
	printf ("CSR indicates write error (%08lx) at %08lx\n", csr, (ulong)addr);
	flag = 1;
	}

	/* Clear Status Registers Command */
	*addr = 0x50505050;
	asm("sync");
	/* Reset to read array mode */
	*addr = 0xFFFFFFFF;
	asm("sync");

	return (flag);
	}

	/*-----------------------------------------------------------------------
	* Clear Block Lock Bit, returns:
	* 0 - OK
	* 1 - Timeout
	*/

	static int clear_block_lock_bit(vu_long * addr)
	{
	ulong start, now;

	/* Reset Array */
	*addr = 0xffffffff;
	asm("sync");
	/* Clear Status Register */
	*addr = 0x50505050;
	asm("sync");

	*addr = 0x60606060;
	asm("sync");
	*addr = 0xd0d0d0d0;
	asm("sync");

	start = get_timer (0);
	while((*addr & 0x00800080) != 0x00800080){
	if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
	printf ("Timeout on clearing Block Lock Bit\n");
	addr = 0xFFFFFFFF; / reset bank */
	asm("sync");
	return 1;
	}
	}
	return 0;
	}

	#endif /* !CFG_NO_FLASH */