board/xsengine/flash.c - platform/external/u-boot - Gitiles

 /*
  * (C) Copyright 2002
  * Robert Schwebel, Pengutronix, <r.schwebel@pengutronix.de>
  *
  * (C) Copyright 2000-2004
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of
  * the License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  * MA 02111-1307 USA
  */

 #include <common.h>
 #include <linux/byteorder/swab.h>

 #if defined CFG_JFFS_CUSTOM_PART
 #include <jffs2/jffs2.h>
 #endif

 #define SWAP(x)               __swab32(x)

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

 /* 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 void flash_get_offsets (ulong base, flash_info_t *info);

 #if defined CFG_JFFS_CUSTOM_PART

 /*
  * jffs2_part_info - get information about a JFFS2 partition
  *
  * @part_num: number of the partition you want to get info about
  * @return:   struct part_info* in case of success, 0 if failure
  */

 static struct part_info part;
 static int current_part = -1;

 struct part_info* jffs2_part_info(int part_num) {
 	void *jffs2_priv_saved = part.jffs2_priv;

 	printf("jffs2_part_info: part_num=%i\n",part_num);

 	if (current_part == part_num)
 		return &part;

 	/* u-boot partition                                                 */
 	if(part_num==0){
 		memset(&part, 0, sizeof(part));

 		part.offset=(char*)0x00000000;
 		part.size=256*1024;

 		/* Mark the struct as ready */
 		current_part = part_num;

 		printf("part.offset = 0x%08x\n",(unsigned int)part.offset);
 		printf("part.size   = 0x%08x\n",(unsigned int)part.size);
 	}

 	/* primary OS+firmware partition                                    */
 	if(part_num==1){
 		memset(&part, 0, sizeof(part));

 		part.offset=(char*)0x00040000;
 		part.size=1024*1024;

 		/* Mark the struct as ready */
 		current_part = part_num;

 		printf("part.offset = 0x%08x\n",(unsigned int)part.offset);
 		printf("part.size   = 0x%08x\n",(unsigned int)part.size);
 	}

 	/* secondary OS+firmware partition                                  */
 	if(part_num==2){
 		memset(&part, 0, sizeof(part));

 		part.offset=(char*)0x00140000;
 		part.size=8*1024*1024;

 		/* Mark the struct as ready */
 		current_part = part_num;

 		printf("part.offset = 0x%08x\n",(unsigned int)part.offset);
 		printf("part.size   = 0x%08x\n",(unsigned int)part.size);
 	}

 	if (current_part == part_num) {
 		part.usr_priv = &current_part;
 		part.jffs2_priv = jffs2_priv_saved;
 		return &part;
 	}

 	printf("jffs2_part_info: end of partition table\n");
 	return 0;
 }
 #endif


 /*-----------------------------------------------------------------------
  */
 unsigned long flash_init (void)
 {
 	int i;
 	ulong size = 0;

 	for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
 		switch (i) {
 		case 0:
 			flash_get_size ((long *) PHYS_FLASH_1, &flash_info[i]);
 			flash_get_offsets (PHYS_FLASH_1, &flash_info[i]);
 			break;
 		case 1:
 			flash_get_size ((long *) PHYS_FLASH_2, &flash_info[i]);
 			flash_get_offsets (PHYS_FLASH_2, &flash_info[i]);
 			break;
 		default:
 			panic ("configured too many flash banks!\n");
 			break;
 		}
 		size += flash_info[i].size;
 	}

 	/* Protect monitor and environment sectors */
 	flash_protect ( FLAG_PROTECT_SET,CFG_FLASH_BASE,CFG_FLASH_BASE + monitor_flash_len - 1,&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_get_offsets (ulong base, flash_info_t *info)
 {
 	int i;

 	if (info->flash_id == FLASH_UNKNOWN) return;

 	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD) {
 		for (i = 0; i < info->sector_count; i++) {
 			info->start[i] = base + (i * PHYS_FLASH_SECT_SIZE);
 			info->protect[i] = 0;
 		}
 	}
 }

 /*-----------------------------------------------------------------------
  */
 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_AMD:	printf ("AMD ");		break;
 	case FLASH_MAN_FUJ:	printf ("FUJITSU ");		break;
 	default:		printf ("Unknown Vendor ");	break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AMLV128U:	printf ("AM29LV128ML (128Mbit, uniform sector size)\n");
 				break;
 	case FLASH_AMLV320U:	printf ("AM29LV320ML (32Mbit, uniform sector size)\n");
 				break;
 	case FLASH_AMLV640U:	printf ("AM29LV640ML (64Mbit, uniform sector size)\n");
 				break;
 	case FLASH_AMLV320B:	printf ("AM29LV320MB (32Mbit, bottom boot sect)\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");
 	return;
 }

 /*
  * 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;

 	/* Write auto select command: read Manufacturer ID */
 	addr[0x0555] = 0x00AA00AA;
 	addr[0x02AA] = 0x00550055;
 	addr[0x0555] = 0x00900090;

 	value = addr[0];

 	debug ("Manuf. ID @ 0x%08lx: 0x%08lx\n", (ulong)addr, value);

 	switch (value) {
 	case AMD_MANUFACT:
 		debug ("Manufacturer: AMD\n");
 		info->flash_id = FLASH_MAN_AMD;
 		break;
 	case FUJ_MANUFACT:
 		debug ("Manufacturer: FUJITSU\n");
 		info->flash_id = FLASH_MAN_FUJ;
 		break;
 	default:
 		debug ("Manufacturer: *** unknown ***\n");
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0;
 		return (0);			/* no or unknown flash	*/
 	}

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

 	debug ("Device ID @ 0x%08lx: 0x%08lx\n", (ulong)(&addr[1]), value);

 	switch (value) {

 	case AMD_ID_MIRROR:
 		debug ("Mirror Bit flash: addr[14] = %08lX  addr[15] = %08lX\n",
 			addr[14], addr[15]);
 		switch(addr[14]) {
 		case AMD_ID_LV128U_2:
 			if (addr[15] != AMD_ID_LV128U_3) {
 				debug ("Chip: AMLV128U -> unknown\n");
 				info->flash_id = FLASH_UNKNOWN;
 			} else {
 				debug ("Chip: AMLV128U\n");
 				info->flash_id += FLASH_AMLV128U;
 				info->sector_count = 256;
 				info->size = 0x02000000;
 			}
 			break;				/* => 32 MB	*/
 		case AMD_ID_LV640U_2:
 			if (addr[15] != AMD_ID_LV640U_3) {
 				debug ("Chip: AMLV640U -> unknown\n");
 				info->flash_id = FLASH_UNKNOWN;
 			} else {
 				debug ("Chip: AMLV640U\n");
 				info->flash_id += FLASH_AMLV640U;
 				info->sector_count = 128;
 				info->size = 0x01000000;
 			}
 			break;				/* => 16 MB	*/
 		case AMD_ID_LV320B_2:
 			if (addr[15] != AMD_ID_LV320B_3) {
 				debug ("Chip: AMLV320B -> unknown\n");
 				info->flash_id = FLASH_UNKNOWN;
 			} else {
 				debug ("Chip: AMLV320B\n");
 				info->flash_id += FLASH_AMLV320B;
 				info->sector_count = 71;
 				info->size = 0x00800000;
 			}
 			break;				/* =>  8 MB	*/
 		default:
 			debug ("Chip: *** unknown ***\n");
 			info->flash_id = FLASH_UNKNOWN;
 			break;
 		}
 		break;

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

 	/* set up sector start address table */
 	switch (value) {
 	case AMD_ID_MIRROR:
 		switch (info->flash_id & FLASH_TYPEMASK) {
 		/* only known types here - no default */
 		case FLASH_AMLV128U:
 		case FLASH_AMLV640U:
 		case FLASH_AMLV320U:
 			for (i = 0; i < info->sector_count; i++) {
 				info->start[i] = base;
 				base += 0x20000;
 			}
 			break;
 		case FLASH_AMLV320B:
 			for (i = 0; i < info->sector_count; i++) {
 				info->start[i] = base;
 				/*
 				 * The first 8 sectors are 8 kB,
 				 * all the other ones  are 64 kB
 				 */
 				base += (i < 8)
 					?  2 * ( 8 << 10)
 					:  2 * (64 << 10);
 			}
 			break;
 		}
 		break;

 	default:
 		return (0);
 		break;
 	}

 #if 0
 	/* 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 */
 		addr = (volatile unsigned long *)(info->start[i]);
 		info->protect[i] = addr[2] & 1;
 	}
 #endif

 	/*
 	 * Prevent writes to uninitialized FLASH.
 	 */
 	if (info->flash_id != FLASH_UNKNOWN) {
 		addr = (volatile unsigned long *)info->start[0];

 		*addr = 0x00F000F0;	/* reset bank */
 	}

 	return (info->size);
 }


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

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

 	debug ("flash_erase: first: %d last: %d\n", s_first, s_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_UNKNOWN) ||
 	    (info->flash_id > FLASH_AMD_COMP)) {
 		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");
 	}

 	l_sect = -1;

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

 	addr[0x0555] = 0x00AA00AA;
 	addr[0x02AA] = 0x00550055;
 	addr[0x0555] = 0x00800080;
 	addr[0x0555] = 0x00AA00AA;
 	addr[0x02AA] = 0x00550055;

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect<=s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			addr = (vu_long*)(info->start[sect]);
 			addr[0] = 0x00300030;
 			l_sect = sect;
 		}
 	}

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

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

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

 	start = get_timer (0);
 	last  = start;
 	addr = (vu_long*)(info->start[l_sect]);
 	while ((addr[0] & 0x00800080) != 0x00800080) {
 		if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 			printf ("Timeout\n");
 			return 1;
 		}
 		/* show that we're waiting */
 		if ((now - last) > 100000) {	/* every second */
 			putc ('.');
 			last = now;
 		}
 	}

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

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

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

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

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

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

 		if ((rc = write_word(info, wp, SWAP(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, SWAP(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, SWAP(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*)(info->start[0]);
 	ulong start;
 	int flag;

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

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

 	addr[0x0555] = 0x00AA00AA;
 	addr[0x02AA] = 0x00550055;
 	addr[0x0555] = 0x00A000A0;

 	*((vu_long *)dest) = data;

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

 	/* data polling for D7 */
 	start = get_timer (0);
 	while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
 		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 			return (1);
 		}
 	}
 	return (0);
 }
	/*
	* (C) Copyright 2002
	* Robert Schwebel, Pengutronix, <r.schwebel@pengutronix.de>
	*
	* (C) Copyright 2000-2004
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* See file CREDITS for list of people who contributed to this
	* project.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 of
	* the License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	* MA 02111-1307 USA
	*/

	#include <common.h>
	#include <linux/byteorder/swab.h>

	#if defined CFG_JFFS_CUSTOM_PART
	#include <jffs2/jffs2.h>
	#endif

	#define SWAP(x) __swab32(x)

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

	/* 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 void flash_get_offsets (ulong base, flash_info_t *info);

	#if defined CFG_JFFS_CUSTOM_PART

	/*
	* jffs2_part_info - get information about a JFFS2 partition
	*
	* @part_num: number of the partition you want to get info about
	* @return: struct part_info* in case of success, 0 if failure
	*/

	static struct part_info part;
	static int current_part = -1;

	struct part_info* jffs2_part_info(int part_num) {
	void *jffs2_priv_saved = part.jffs2_priv;

	printf("jffs2_part_info: part_num=%i\n",part_num);

	if (current_part == part_num)
	return ∂

	/* u-boot partition */
	if(part_num==0){
	memset(&part, 0, sizeof(part));

	part.offset=(char*)0x00000000;
	part.size=256*1024;

	/* Mark the struct as ready */
	current_part = part_num;

	printf("part.offset = 0x%08x\n",(unsigned int)part.offset);
	printf("part.size = 0x%08x\n",(unsigned int)part.size);
	}

	/* primary OS+firmware partition */
	if(part_num==1){
	memset(&part, 0, sizeof(part));

	part.offset=(char*)0x00040000;
	part.size=1024*1024;

	/* Mark the struct as ready */
	current_part = part_num;

	printf("part.offset = 0x%08x\n",(unsigned int)part.offset);
	printf("part.size = 0x%08x\n",(unsigned int)part.size);
	}

	/* secondary OS+firmware partition */
	if(part_num==2){
	memset(&part, 0, sizeof(part));

	part.offset=(char*)0x00140000;
	part.size=810241024;

	/* Mark the struct as ready */
	current_part = part_num;

	printf("part.offset = 0x%08x\n",(unsigned int)part.offset);
	printf("part.size = 0x%08x\n",(unsigned int)part.size);
	}

	if (current_part == part_num) {
	part.usr_priv = &current_part;
	part.jffs2_priv = jffs2_priv_saved;
	return ∂
	}

	printf("jffs2_part_info: end of partition table\n");
	return 0;
	}
	#endif


	/*-----------------------------------------------------------------------
	*/
	unsigned long flash_init (void)
	{
	int i;
	ulong size = 0;

	for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
	switch (i) {
	case 0:
	flash_get_size ((long *) PHYS_FLASH_1, &flash_info[i]);
	flash_get_offsets (PHYS_FLASH_1, &flash_info[i]);
	break;
	case 1:
	flash_get_size ((long *) PHYS_FLASH_2, &flash_info[i]);
	flash_get_offsets (PHYS_FLASH_2, &flash_info[i]);
	break;
	default:
	panic ("configured too many flash banks!\n");
	break;
	}
	size += flash_info[i].size;
	}

	/* Protect monitor and environment sectors */
	flash_protect ( FLAG_PROTECT_SET,CFG_FLASH_BASE,CFG_FLASH_BASE + monitor_flash_len - 1,&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_get_offsets (ulong base, flash_info_t *info)
	{
	int i;

	if (info->flash_id == FLASH_UNKNOWN) return;

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD) {
	for (i = 0; i < info->sector_count; i++) {
	info->start[i] = base + (i * PHYS_FLASH_SECT_SIZE);
	info->protect[i] = 0;
	}
	}
	}

	/*-----------------------------------------------------------------------
	*/
	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_AMD: printf ("AMD "); break;
	case FLASH_MAN_FUJ: printf ("FUJITSU "); break;
	default: printf ("Unknown Vendor "); break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AMLV128U: printf ("AM29LV128ML (128Mbit, uniform sector size)\n");
	break;
	case FLASH_AMLV320U: printf ("AM29LV320ML (32Mbit, uniform sector size)\n");
	break;
	case FLASH_AMLV640U: printf ("AM29LV640ML (64Mbit, uniform sector size)\n");
	break;
	case FLASH_AMLV320B: printf ("AM29LV320MB (32Mbit, bottom boot sect)\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");
	return;
	}

	/*
	* 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;

	/* Write auto select command: read Manufacturer ID */
	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;
	addr[0x0555] = 0x00900090;

	value = addr[0];

	debug ("Manuf. ID @ 0x%08lx: 0x%08lx\n", (ulong)addr, value);

	switch (value) {
	case AMD_MANUFACT:
	debug ("Manufacturer: AMD\n");
	info->flash_id = FLASH_MAN_AMD;
	break;
	case FUJ_MANUFACT:
	debug ("Manufacturer: FUJITSU\n");
	info->flash_id = FLASH_MAN_FUJ;
	break;
	default:
	debug ("Manufacturer: * unknown *\n");
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	return (0); /* no or unknown flash */
	}

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

	debug ("Device ID @ 0x%08lx: 0x%08lx\n", (ulong)(&addr[1]), value);

	switch (value) {

	case AMD_ID_MIRROR:
	debug ("Mirror Bit flash: addr[14] = %08lX addr[15] = %08lX\n",
	addr[14], addr[15]);
	switch(addr[14]) {
	case AMD_ID_LV128U_2:
	if (addr[15] != AMD_ID_LV128U_3) {
	debug ("Chip: AMLV128U -> unknown\n");
	info->flash_id = FLASH_UNKNOWN;
	} else {
	debug ("Chip: AMLV128U\n");
	info->flash_id += FLASH_AMLV128U;
	info->sector_count = 256;
	info->size = 0x02000000;
	}
	break; /* => 32 MB */
	case AMD_ID_LV640U_2:
	if (addr[15] != AMD_ID_LV640U_3) {
	debug ("Chip: AMLV640U -> unknown\n");
	info->flash_id = FLASH_UNKNOWN;
	} else {
	debug ("Chip: AMLV640U\n");
	info->flash_id += FLASH_AMLV640U;
	info->sector_count = 128;
	info->size = 0x01000000;
	}
	break; /* => 16 MB */
	case AMD_ID_LV320B_2:
	if (addr[15] != AMD_ID_LV320B_3) {
	debug ("Chip: AMLV320B -> unknown\n");
	info->flash_id = FLASH_UNKNOWN;
	} else {
	debug ("Chip: AMLV320B\n");
	info->flash_id += FLASH_AMLV320B;
	info->sector_count = 71;
	info->size = 0x00800000;
	}
	break; /* => 8 MB */
	default:
	debug ("Chip: * unknown *\n");
	info->flash_id = FLASH_UNKNOWN;
	break;
	}
	break;

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

	/* set up sector start address table */
	switch (value) {
	case AMD_ID_MIRROR:
	switch (info->flash_id & FLASH_TYPEMASK) {
	/* only known types here - no default */
	case FLASH_AMLV128U:
	case FLASH_AMLV640U:
	case FLASH_AMLV320U:
	for (i = 0; i < info->sector_count; i++) {
	info->start[i] = base;
	base += 0x20000;
	}
	break;
	case FLASH_AMLV320B:
	for (i = 0; i < info->sector_count; i++) {
	info->start[i] = base;
	/*
	* The first 8 sectors are 8 kB,
	* all the other ones are 64 kB
	*/
	base += (i < 8)
	? 2 * ( 8 << 10)
	: 2 * (64 << 10);
	}
	break;
	}
	break;

	default:
	return (0);
	break;
	}

	#if 0
	/* 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 */
	addr = (volatile unsigned long *)(info->start[i]);
	info->protect[i] = addr[2] & 1;
	}
	#endif

	/*
	* Prevent writes to uninitialized FLASH.
	*/
	if (info->flash_id != FLASH_UNKNOWN) {
	addr = (volatile unsigned long *)info->start[0];

	addr = 0x00F000F0; / reset bank */
	}

	return (info->size);
	}


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

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

	debug ("flash_erase: first: %d last: %d\n", s_first, s_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_UNKNOWN) \|\|
	(info->flash_id > FLASH_AMD_COMP)) {
	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");
	}

	l_sect = -1;

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

	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;
	addr[0x0555] = 0x00800080;
	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	addr = (vu_long*)(info->start[sect]);
	addr[0] = 0x00300030;
	l_sect = sect;
	}
	}

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

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

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

	start = get_timer (0);
	last = start;
	addr = (vu_long*)(info->start[l_sect]);
	while ((addr[0] & 0x00800080) != 0x00800080) {
	if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
	printf ("Timeout\n");
	return 1;
	}
	/* show that we're waiting */
	if ((now - last) > 100000) { /* every second */
	putc ('.');
	last = now;
	}
	}

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

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

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

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

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

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

	if ((rc = write_word(info, wp, SWAP(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, SWAP(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, SWAP(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)(info->start[0]);
	ulong start;
	int flag;

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

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

	addr[0x0555] = 0x00AA00AA;
	addr[0x02AA] = 0x00550055;
	addr[0x0555] = 0x00A000A0;

	((vu_long )dest) = data;

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

	/* data polling for D7 */
	start = get_timer (0);
	while ((((vu_long )dest) & 0x00800080) != (data & 0x00800080)) {
	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
	return (1);
	}
	}
	return (0);
	}