board/siemens/SMN42/flash.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2006 Embedded Artists AB <www.embeddedartists.com>
  *
  * (C) Copyright 2007 Gary Jennejohn garyj@denx.de
  * Modified to use the routines in cpu/arm720t/lpc2292/flash.c.
  * Heavily modified to support the SMN42 board from Siemens
  *
  * 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 <asm/byteorder.h>
 #include <asm/arch/hardware.h>

 static unsigned long flash_addr_table[CONFIG_SYS_MAX_FLASH_BANKS] = CONFIG_SYS_FLASH_BANKS_LIST;
 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];

 extern int lpc2292_copy_buffer_to_flash(flash_info_t *, ulong);
 extern int lpc2292_flash_erase(flash_info_t *, int, int);
 extern int lpc2292_write_buff (flash_info_t *, uchar *, ulong, ulong);
 static unsigned long ext_flash_init(void);
 static int ext_flash_erase(flash_info_t *, int, int);
 static int ext_write_buff(flash_info_t *, uchar *, ulong, ulong);

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

 ulong flash_init (void)
 {
 	int j, k;
 	ulong size = 0;
 	ulong flashbase = 0;

 	flash_info[0].flash_id = PHILIPS_LPC2292;
 	flash_info[0].size = 0x003E000;	/* 256 - 8 KB */
 	flash_info[0].sector_count = 17;
 	memset (flash_info[0].protect, 0, 17);
 	flashbase = 0x00000000;
 	for (j = 0, k = 0; j < 8; j++, k++) {
 		flash_info[0].start[k] = flashbase;
 		flashbase += 0x00002000;
 	}
 	for (j = 0; j < 2; j++, k++) {
 		flash_info[0].start[k] = flashbase;
 		flashbase += 0x00010000;
 	}
 	for (j = 0; j < 7; j++, k++) {
 		flash_info[0].start[k] = flashbase;
 		flashbase += 0x00002000;
 	}
 	size += flash_info[0].size;

 	/* Protect monitor and environment sectors */
 	flash_protect (FLAG_PROTECT_SET,
 		 0x0,
 		 0x0 + monitor_flash_len - 1,
 		 &flash_info[0]);

 	flash_protect (FLAG_PROTECT_SET,
 		 CONFIG_ENV_ADDR,
 		 CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
 		 &flash_info[0]);

 	size += ext_flash_init();

 	return size;
 }

 /*-----------------------------------------------------------------------
  */
 void flash_print_info (flash_info_t * info)
 {
 	int i;
 	int erased = 0;
 	unsigned long j;
 	unsigned long count;
 	unsigned char *p;

 	switch (info->flash_id & FLASH_VENDMASK) {
 	case (PHILIPS_LPC2292 & FLASH_VENDMASK):
 		printf("Philips: ");
 		break;
 	case FLASH_MAN_AMD:
 		printf("AMD: ");
 		break;
 	default:
 		printf ("Unknown Vendor ");
 		break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case (PHILIPS_LPC2292 & FLASH_TYPEMASK):
 		printf("LPC2292 internal flash\n");
 		break;
 	case FLASH_S29GL128N:
 		printf ("S29GL128N (128 Mbit, uniform sector size)\n");
 		break;
 	default:
 		printf("Unknown Chip Type\n");
 		return;
 	}

 	printf ("  Size: %ld KB in %d Sectors\n",
 	  info->size >> 10, info->sector_count);

 	printf ("  Sector Start Addresses:");
 	for (i = 0; i < info->sector_count; i++) {
 		if ((i % 5) == 0) {
 			printf ("\n   ");
 		}
 		if (i < (info->sector_count - 1)) {
 			count = info->start[i+1] - info->start[i];
 		}
 		else {
 			count = info->start[0] + info->size - info->start[i];
 		}
 		p = (unsigned char*)(info->start[i]);
 		erased = 1;
 		for (j = 0; j < count; j++) {
 			if (*p != 0xFF) {
 				erased = 0;
 				break;
 			}
 			p++;
 		}
 		printf (" %08lX%s%s", info->start[i], info->protect[i] ? " RO" : "   ",
 			erased ? " E" : "  ");
 	}
 	printf ("\n");
 }

 int flash_erase (flash_info_t * info, int s_first, int s_last)
 {
 	switch (info->flash_id & FLASH_TYPEMASK) {
 		case (PHILIPS_LPC2292 & FLASH_TYPEMASK):
 			return lpc2292_flash_erase(info, s_first, s_last);
 		case FLASH_S29GL128N:
 			return ext_flash_erase(info, s_first, s_last);
 		default:
 			return ERR_PROTECTED;
 	}
 	return ERR_PROTECTED;
 }

 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 {
 	switch (info->flash_id & FLASH_TYPEMASK) {
 		case (PHILIPS_LPC2292 & FLASH_TYPEMASK):
 			return lpc2292_write_buff(info, src, addr, cnt);
 		case FLASH_S29GL128N:
 			return ext_write_buff(info, src, addr, cnt);
 		default:
 			return ERR_PROG_ERROR;
 	}
 	return ERR_PROG_ERROR;
 }

 /*--------------------------------------------------------------------------
  * From here on is code for the external S29GL128N taken from cam5200_flash.c
  */

 #define CONFIG_SYS_FLASH_WORD_SIZE unsigned short

 static int wait_for_DQ7_32(flash_info_t * info, int sect)
 {
 	ulong start, now, last;
 	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr =
 		(CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

 	start = get_timer(0);
 	last = start;
 	while ((addr[0] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080) !=
 			(CONFIG_SYS_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 */
 			putc('.');
 			last = now;
 		}
 	}
 	return 0;
 }

 int ext_flash_erase(flash_info_t * info, int s_first, int s_last)
 {
 	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
 	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2;
 	int flag, prot, sect, l_sect, ret;

 	ret = 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;
 	}

 	if (info->flash_id == FLASH_UNKNOWN) {
 		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!", prot);

 	printf("\n");

 	l_sect = -1;

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

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect <= s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

 			addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
 			addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
 			addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080;
 			addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
 			addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
 			addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00300030;	/* sector erase */

 			l_sect = sect;
 			/*
 			 * Wait for each sector to complete, it's more
 			 * reliable.  According to AMD Spec, you must
 			 * issue all erase commands within a specified
 			 * timeout.  This has been seen to fail, especially
 			 * if printf()s are included (for debug)!!
 			 */
 			ret = wait_for_DQ7_32(info, sect);
 			if (ret) {
 				ret = ERR_PROTECTED;
 				break;
 			}
 		}
 	}

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

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

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

 	if (ret)
 		printf(" error\n");
 	else
 		printf(" done\n");
 	return ret;
 }

 static ulong flash_get_size(vu_long * addr, flash_info_t * info)
 {
 	short i;
 	CONFIG_SYS_FLASH_WORD_SIZE value;
 	ulong base = (ulong) addr;
 	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) addr;

 	/* Write auto select command: read Manufacturer ID */
 	addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
 	addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
 	addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00900090;
 	udelay(1000);

 	value = addr2[0];

 	switch (value) {
 		case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_MANUFACT:
 			info->flash_id = FLASH_MAN_AMD;
 			break;
 		default:
 			info->flash_id = FLASH_UNKNOWN;
 			info->sector_count = 0;
 			info->size = 0;
 			return (0);	/* no or unknown flash  */
 	}

 	value = addr2[1];	/* device ID            */

 	switch (value) {
 		case (CONFIG_SYS_FLASH_WORD_SIZE)AMD_ID_MIRROR:
 			value = addr2[14];
 			switch(value) {
 				case (CONFIG_SYS_FLASH_WORD_SIZE)AMD_ID_GL128N_2:
 					value = addr2[15];
 					if (value != (CONFIG_SYS_FLASH_WORD_SIZE)AMD_ID_GL128N_3) {
 						info->flash_id = FLASH_UNKNOWN;
 					} else {
 						info->flash_id += FLASH_S29GL128N;
 						info->sector_count = 128;
 						info->size = 0x01000000;
 					}
 					break;
 				default:
 					info->flash_id = FLASH_UNKNOWN;
 					return(0);
 			}
 			break;

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

 	/* set up sector start address table */
 	for (i = 0; i < info->sector_count; i++)
 		info->start[i] = base + (i * 0x00020000);

 	/* 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 CONFIG_SYS_FLASH_WORD_SIZE *)(info->start[i]);

 		info->protect[i] = addr2[2] & 1;
 	}

 	/* issue bank reset to return to read mode */
 	addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00F000F0;

 	return (info->size);
 }

 static unsigned long ext_flash_init(void)
 {
 	unsigned long total_b = 0;
 	unsigned long size_b[CONFIG_SYS_MAX_FLASH_BANKS];
 	int i;

 	/* Init: no FLASHes known */
 	for (i = 1; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
 		flash_info[i].flash_id = FLASH_UNKNOWN;
 		flash_info[i].sector_count = -1;
 		flash_info[i].size = 0;

 		/* call flash_get_size() to initialize sector address */
 		size_b[i] = flash_get_size((vu_long *) flash_addr_table[i],
 				&flash_info[i]);

 		flash_info[i].size = size_b[i];

 		if (flash_info[i].flash_id == FLASH_UNKNOWN) {
 			printf("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",
 					i+1, size_b[i], size_b[i] << 20);
 			flash_info[i].sector_count = -1;
 			flash_info[i].size = 0;
 		}

 		total_b += flash_info[i].size;
 	}

 	return total_b;
 }

 static int write_word(flash_info_t * info, ulong dest, ushort data)
 {
 	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[0]);
 	volatile CONFIG_SYS_FLASH_WORD_SIZE *dest2 = (CONFIG_SYS_FLASH_WORD_SIZE *) dest;
 	volatile CONFIG_SYS_FLASH_WORD_SIZE *data2 = (CONFIG_SYS_FLASH_WORD_SIZE *) &data;
 	ulong start;
 	int flag;

 	/* Check if Flash is (sufficiently) erased */
 	if ((*dest2 & *data2) != *data2) {
 		return (2);
 	}

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

 	addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
 	addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
 	addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00A000A0;
 	*dest2 = *data2;

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

 	/* data polling for D7 */
 	start = get_timer(0);
 	while ((*dest2 & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080) !=
 			(*data2 & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080)) {

 		if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 			printf("WRITE_TOUT\n");
 			return (1);
 		}
 	}
 	return (0);
 }

 /*-----------------------------------------------------------------------
  * This is taken from the original flash.c for the LPC2292 SODIMM board
  * and modified to suit.
  */

 int ext_write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 {
 	ushort tmp;
 	ulong i;
 	uchar* src_org;
 	uchar* dst_org;
 	ulong cnt_org = cnt;
 	int ret = ERR_OK;

 	src_org = src;
 	dst_org = (uchar*)addr;

 	if (addr & 1) {		/* if odd address */
 		tmp = *((uchar*)(addr - 1)); /* little endian */
 		tmp |= (*src << 8);
 		if (write_word(info, addr - 1, tmp))
 			return ERR_PROG_ERROR;
 		addr += 1;
 		cnt -= 1;
 		src++;
 	}
 	while (cnt > 1) {
 		tmp = ((*(src+1)) << 8) + (*src); /* little endian */
 		if (write_word(info, addr, tmp))
 			return ERR_PROG_ERROR;
 		addr += 2;
 		src += 2;
 		cnt -= 2;
 	}
 	if (cnt > 0) {
 		tmp = (*((uchar*)(addr + 1))) << 8;
 		tmp |= *src;
 		if (write_word(info, addr, tmp))
 			return ERR_PROG_ERROR;
 	}

 	for (i = 0; i < cnt_org; i++) {
 		if (*dst_org != *src_org) {
 			printf("Write failed. Byte %lX differs\n", i);
 			ret = ERR_PROG_ERROR;
 			break;
 		}
 		dst_org++;
 		src_org++;
 	}

 	return ret;
 }
	/*
	* (C) Copyright 2006 Embedded Artists AB <www.embeddedartists.com>
	*
	* (C) Copyright 2007 Gary Jennejohn garyj@denx.de
	* Modified to use the routines in cpu/arm720t/lpc2292/flash.c.
	* Heavily modified to support the SMN42 board from Siemens
	*
	* 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 <asm/byteorder.h>
	#include <asm/arch/hardware.h>

	static unsigned long flash_addr_table[CONFIG_SYS_MAX_FLASH_BANKS] = CONFIG_SYS_FLASH_BANKS_LIST;
	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];

	extern int lpc2292_copy_buffer_to_flash(flash_info_t *, ulong);
	extern int lpc2292_flash_erase(flash_info_t *, int, int);
	extern int lpc2292_write_buff (flash_info_t , uchar , ulong, ulong);
	static unsigned long ext_flash_init(void);
	static int ext_flash_erase(flash_info_t *, int, int);
	static int ext_write_buff(flash_info_t , uchar , ulong, ulong);

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

	ulong flash_init (void)
	{
	int j, k;
	ulong size = 0;
	ulong flashbase = 0;

	flash_info[0].flash_id = PHILIPS_LPC2292;
	flash_info[0].size = 0x003E000; /* 256 - 8 KB */
	flash_info[0].sector_count = 17;
	memset (flash_info[0].protect, 0, 17);
	flashbase = 0x00000000;
	for (j = 0, k = 0; j < 8; j++, k++) {
	flash_info[0].start[k] = flashbase;
	flashbase += 0x00002000;
	}
	for (j = 0; j < 2; j++, k++) {
	flash_info[0].start[k] = flashbase;
	flashbase += 0x00010000;
	}
	for (j = 0; j < 7; j++, k++) {
	flash_info[0].start[k] = flashbase;
	flashbase += 0x00002000;
	}
	size += flash_info[0].size;

	/* Protect monitor and environment sectors */
	flash_protect (FLAG_PROTECT_SET,
	0x0,
	0x0 + monitor_flash_len - 1,
	&flash_info[0]);

	flash_protect (FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
	&flash_info[0]);

	size += ext_flash_init();

	return size;
	}

	/*-----------------------------------------------------------------------
	*/
	void flash_print_info (flash_info_t * info)
	{
	int i;
	int erased = 0;
	unsigned long j;
	unsigned long count;
	unsigned char *p;

	switch (info->flash_id & FLASH_VENDMASK) {
	case (PHILIPS_LPC2292 & FLASH_VENDMASK):
	printf("Philips: ");
	break;
	case FLASH_MAN_AMD:
	printf("AMD: ");
	break;
	default:
	printf ("Unknown Vendor ");
	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case (PHILIPS_LPC2292 & FLASH_TYPEMASK):
	printf("LPC2292 internal flash\n");
	break;
	case FLASH_S29GL128N:
	printf ("S29GL128N (128 Mbit, uniform sector size)\n");
	break;
	default:
	printf("Unknown Chip Type\n");
	return;
	}

	printf (" Size: %ld KB in %d Sectors\n",
	info->size >> 10, info->sector_count);

	printf (" Sector Start Addresses:");
	for (i = 0; i < info->sector_count; i++) {
	if ((i % 5) == 0) {
	printf ("\n ");
	}
	if (i < (info->sector_count - 1)) {
	count = info->start[i+1] - info->start[i];
	}
	else {
	count = info->start[0] + info->size - info->start[i];
	}
	p = (unsigned char*)(info->start[i]);
	erased = 1;
	for (j = 0; j < count; j++) {
	if (*p != 0xFF) {
	erased = 0;
	break;
	}
	p++;
	}
	printf (" %08lX%s%s", info->start[i], info->protect[i] ? " RO" : " ",
	erased ? " E" : " ");
	}
	printf ("\n");
	}

	int flash_erase (flash_info_t * info, int s_first, int s_last)
	{
	switch (info->flash_id & FLASH_TYPEMASK) {
	case (PHILIPS_LPC2292 & FLASH_TYPEMASK):
	return lpc2292_flash_erase(info, s_first, s_last);
	case FLASH_S29GL128N:
	return ext_flash_erase(info, s_first, s_last);
	default:
	return ERR_PROTECTED;
	}
	return ERR_PROTECTED;
	}

	int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
	{
	switch (info->flash_id & FLASH_TYPEMASK) {
	case (PHILIPS_LPC2292 & FLASH_TYPEMASK):
	return lpc2292_write_buff(info, src, addr, cnt);
	case FLASH_S29GL128N:
	return ext_write_buff(info, src, addr, cnt);
	default:
	return ERR_PROG_ERROR;
	}
	return ERR_PROG_ERROR;
	}

	/*--------------------------------------------------------------------------
	* From here on is code for the external S29GL128N taken from cam5200_flash.c
	*/

	#define CONFIG_SYS_FLASH_WORD_SIZE unsigned short

	static int wait_for_DQ7_32(flash_info_t * info, int sect)
	{
	ulong start, now, last;
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr =
	(CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

	start = get_timer(0);
	last = start;
	while ((addr[0] & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080) !=
	(CONFIG_SYS_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 */
	putc('.');
	last = now;
	}
	}
	return 0;
	}

	int ext_flash_erase(flash_info_t * info, int s_first, int s_last)
	{
	volatile CONFIG_SYS_FLASH_WORD_SIZE addr = (CONFIG_SYS_FLASH_WORD_SIZE ) (info->start[0]);
	volatile CONFIG_SYS_FLASH_WORD_SIZE *addr2;
	int flag, prot, sect, l_sect, ret;

	ret = 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;
	}

	if (info->flash_id == FLASH_UNKNOWN) {
	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!", prot);

	printf("\n");

	l_sect = -1;

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

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	addr2 = (CONFIG_SYS_FLASH_WORD_SIZE *) (info->start[sect]);

	addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
	addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
	addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080;
	addr[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
	addr[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
	addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00300030; /* sector erase */

	l_sect = sect;
	/*
	* Wait for each sector to complete, it's more
	* reliable. According to AMD Spec, you must
	* issue all erase commands within a specified
	* timeout. This has been seen to fail, especially
	* if printf()s are included (for debug)!!
	*/
	ret = wait_for_DQ7_32(info, sect);
	if (ret) {
	ret = ERR_PROTECTED;
	break;
	}
	}
	}

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

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

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

	if (ret)
	printf(" error\n");
	else
	printf(" done\n");
	return ret;
	}

	static ulong flash_get_size(vu_long * addr, flash_info_t * info)
	{
	short i;
	CONFIG_SYS_FLASH_WORD_SIZE value;
	ulong base = (ulong) addr;
	volatile CONFIG_SYS_FLASH_WORD_SIZE addr2 = (CONFIG_SYS_FLASH_WORD_SIZE ) addr;

	/* Write auto select command: read Manufacturer ID */
	addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
	addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
	addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00900090;
	udelay(1000);

	value = addr2[0];

	switch (value) {
	case (CONFIG_SYS_FLASH_WORD_SIZE) AMD_MANUFACT:
	info->flash_id = FLASH_MAN_AMD;
	break;
	default:
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	return (0); /* no or unknown flash */
	}

	value = addr2[1]; /* device ID */

	switch (value) {
	case (CONFIG_SYS_FLASH_WORD_SIZE)AMD_ID_MIRROR:
	value = addr2[14];
	switch(value) {
	case (CONFIG_SYS_FLASH_WORD_SIZE)AMD_ID_GL128N_2:
	value = addr2[15];
	if (value != (CONFIG_SYS_FLASH_WORD_SIZE)AMD_ID_GL128N_3) {
	info->flash_id = FLASH_UNKNOWN;
	} else {
	info->flash_id += FLASH_S29GL128N;
	info->sector_count = 128;
	info->size = 0x01000000;
	}
	break;
	default:
	info->flash_id = FLASH_UNKNOWN;
	return(0);
	}
	break;

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

	/* set up sector start address table */
	for (i = 0; i < info->sector_count; i++)
	info->start[i] = base + (i * 0x00020000);

	/* 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 CONFIG_SYS_FLASH_WORD_SIZE *)(info->start[i]);

	info->protect[i] = addr2[2] & 1;
	}

	/* issue bank reset to return to read mode */
	addr2[0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00F000F0;

	return (info->size);
	}

	static unsigned long ext_flash_init(void)
	{
	unsigned long total_b = 0;
	unsigned long size_b[CONFIG_SYS_MAX_FLASH_BANKS];
	int i;

	/* Init: no FLASHes known */
	for (i = 1; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
	flash_info[i].flash_id = FLASH_UNKNOWN;
	flash_info[i].sector_count = -1;
	flash_info[i].size = 0;

	/* call flash_get_size() to initialize sector address */
	size_b[i] = flash_get_size((vu_long *) flash_addr_table[i],
	&flash_info[i]);

	flash_info[i].size = size_b[i];

	if (flash_info[i].flash_id == FLASH_UNKNOWN) {
	printf("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",
	i+1, size_b[i], size_b[i] << 20);
	flash_info[i].sector_count = -1;
	flash_info[i].size = 0;
	}

	total_b += flash_info[i].size;
	}

	return total_b;
	}

	static int write_word(flash_info_t * info, ulong dest, ushort data)
	{
	volatile CONFIG_SYS_FLASH_WORD_SIZE addr2 = (CONFIG_SYS_FLASH_WORD_SIZE ) (info->start[0]);
	volatile CONFIG_SYS_FLASH_WORD_SIZE dest2 = (CONFIG_SYS_FLASH_WORD_SIZE ) dest;
	volatile CONFIG_SYS_FLASH_WORD_SIZE data2 = (CONFIG_SYS_FLASH_WORD_SIZE ) &data;
	ulong start;
	int flag;

	/* Check if Flash is (sufficiently) erased */
	if ((dest2 & data2) != *data2) {
	return (2);
	}

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

	addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00AA00AA;
	addr2[CONFIG_SYS_FLASH_ADDR1] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00550055;
	addr2[CONFIG_SYS_FLASH_ADDR0] = (CONFIG_SYS_FLASH_WORD_SIZE) 0x00A000A0;
	dest2 = data2;

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

	/* data polling for D7 */
	start = get_timer(0);
	while ((*dest2 & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080) !=
	(*data2 & (CONFIG_SYS_FLASH_WORD_SIZE) 0x00800080)) {

	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
	printf("WRITE_TOUT\n");
	return (1);
	}
	}
	return (0);
	}

	/*-----------------------------------------------------------------------
	* This is taken from the original flash.c for the LPC2292 SODIMM board
	* and modified to suit.
	*/

	int ext_write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
	{
	ushort tmp;
	ulong i;
	uchar* src_org;
	uchar* dst_org;
	ulong cnt_org = cnt;
	int ret = ERR_OK;

	src_org = src;
	dst_org = (uchar*)addr;

	if (addr & 1) { /* if odd address */
	tmp = ((uchar)(addr - 1)); /* little endian */
	tmp \|= (*src << 8);
	if (write_word(info, addr - 1, tmp))
	return ERR_PROG_ERROR;
	addr += 1;
	cnt -= 1;
	src++;
	}
	while (cnt > 1) {
	tmp = (((src+1)) << 8) + (src); /* little endian */
	if (write_word(info, addr, tmp))
	return ERR_PROG_ERROR;
	addr += 2;
	src += 2;
	cnt -= 2;
	}
	if (cnt > 0) {
	tmp = (((uchar)(addr + 1))) << 8;
	tmp \|= *src;
	if (write_word(info, addr, tmp))
	return ERR_PROG_ERROR;
	}

	for (i = 0; i < cnt_org; i++) {
	if (dst_org != src_org) {
	printf("Write failed. Byte %lX differs\n", i);
	ret = ERR_PROG_ERROR;
	break;
	}
	dst_org++;
	src_org++;
	}

	return ret;
	}