board/omap5912osk/flash.c - platform/external/u-boot - Gitiles

 /*
  * (C) Copyright 2001
  * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
  *
  * (C) Copyright 2001-2004
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (C) Copyright 2003
  * Texas Instruments, <www.ti.com>
  * Kshitij Gupta <Kshitij@ti.com>

  * (C) Copyright 2004
  * Texas Instruments <www.ti.com>
  * Rishi Bhattacharya
  *
  * 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>

 #define PHYS_FLASH_SECT_SIZE	0x00020000	/* 256 KB sectors (x2) */
 flash_info_t flash_info[CFG_MAX_FLASH_BANKS];	/* info for FLASH chips	   */

 /* Board support for 1 or 2 flash devices */
 #undef FLASH_PORT_WIDTH32
 #define FLASH_PORT_WIDTH16

 #ifdef FLASH_PORT_WIDTH16
 #define FLASH_PORT_WIDTH	ushort
 #define FLASH_PORT_WIDTHV	vu_short
 #define SWAP(x)			__swab16(x)
 #else
 #define FLASH_PORT_WIDTH	ulong
 #define FLASH_PORT_WIDTHV	vu_long
 #define SWAP(x)			__swab32(x)
 #endif

 #define FPW	FLASH_PORT_WIDTH
 #define FPWV	FLASH_PORT_WIDTHV

 #define mb() __asm__ __volatile__ ("" : : : "memory")


 /* Flash Organization Structure */
 typedef struct OrgDef {
 	unsigned int sector_number;
 	unsigned int sector_size;
 } OrgDef;


 /* Flash Organizations */
 OrgDef OrgIntel_28F256L18T[] = {
 	{4, 32 * 1024},				/* 4 * 32kBytes sectors */
 	{255, 128 * 1024},			/* 255 * 128kBytes sectors */
 };


 /*-----------------------------------------------------------------------
  * Functions
  */
 unsigned long flash_init (void);
 static ulong flash_get_size (FPW * addr, flash_info_t * info);
 static int write_data (flash_info_t * info, ulong dest, FPW data);
 static void flash_get_offsets (ulong base, flash_info_t * info);
 void inline spin_wheel (void);
 void flash_print_info (flash_info_t * info);
 void flash_unprotect_sectors (FPWV * addr);
 int flash_erase (flash_info_t * info, int s_first, int s_last);
 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt);

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

 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 ((FPW *) PHYS_FLASH_1, &flash_info[i]);
 			flash_get_offsets (PHYS_FLASH_1, &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;
 	OrgDef *pOrgDef;

 	pOrgDef = OrgIntel_28F256L18T;
 	if (info->flash_id == FLASH_UNKNOWN) {
 		return;
 	}

 	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
 		for (i = 0; i < info->sector_count; i++) {
 			if (i > 255) {
 				info->start[i] = base + (i * 0x8000);
 				info->protect[i] = 0;
 			} else {
 				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_INTEL:
 		printf ("INTEL ");
 		break;
 	default:
 		printf ("Unknown Vendor ");
 		break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_28F256L18T:
 		printf ("FLASH 28F256L18T\n");
 		break;
 	case FLASH_28F128J3A:
 		printf ("FLASH 28F128J3A\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 (FPW * addr, flash_info_t * info)
 {
 	volatile FPW value;

 	/* Write auto select command: read Manufacturer ID */
 	addr[0x5555] = (FPW) 0x00AA00AA;
 	addr[0x2AAA] = (FPW) 0x00550055;
 	addr[0x5555] = (FPW) 0x00900090;

 	mb ();
 	value = addr[0];

 	switch (value) {

 	case (FPW) INTEL_MANUFACT:
 		info->flash_id = FLASH_MAN_INTEL;
 		break;
 	      case (FPW) MT2_MANUFACT:
 		info->flash_id = FLASH_MAN_INTEL;
 		break;

 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0;
 		addr[0] = (FPW) 0x00FF00FF;	/* restore read mode */
 		return (0);		/* no or unknown flash	*/
 	}

 	mb ();
 	value = addr[1];	/* device ID	    */
 	switch (value) {

 	case (FPW) (INTEL_ID_28F256L18T):
 		info->flash_id += FLASH_28F256L18T;
 		info->sector_count = 259;
 		info->size = 0x02000000;
 		break;			/* => 32 MB	*/

 	      case (FPW) (INTEL_ID_28F256K3):
 		info->flash_id +=FLASH_28F256K3;
 		info->sector_count = 259;
 		info->size = 0x02000000;
 		debug ("Intel StrataFlash 28F256K3C device initialized\n");
 		break;			/* => 32 MB	*/

 	case (FPW) (INTEL_ID_28F128J3A):
 		info->flash_id +=FLASH_28F128J3A;
 		info->sector_count = 259;
 		info->size = 0x02000000;
 		debug ("Micron StrataFlash MT28F128J3 device initialized\n");
 		break;			/* => 32 MB	*/

 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		break;
 	}

 	if (info->sector_count > CFG_MAX_FLASH_SECT) {
 		printf ("** ERROR: sector count %d > max (%d) **\n",
 				info->sector_count, CFG_MAX_FLASH_SECT);
 		info->sector_count = CFG_MAX_FLASH_SECT;
 	}

 	addr[0] = (FPW) 0x00FF00FF;	/* restore read mode */

 	return (info->size);
 }


 /* unprotects a sector for write and erase
  * on some intel parts, this unprotects the entire chip, but it
  * wont hurt to call this additional times per sector...
  */
 void flash_unprotect_sectors (FPWV * addr)
 {
 #define PD_FINTEL_WSMS_READY_MASK    0x0080

 FPW status;

 	*addr = (FPW) 0x00500050;	/* clear status register */

 	/* this sends the clear lock bit command */
 	*addr = (FPW) 0x00600060;
 	*addr = (FPW) 0x00D000D0;

 	      while (((status =*addr) & (FPW) 0x00800080) != (FPW) 0x00800080);

 	      *addr = (FPW) 0x00FF00FF;

 }


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

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

 	type = (info->flash_id & FLASH_VENDMASK);
 	if ((type != FLASH_MAN_INTEL)) {
 		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;

 	/* 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 */
 			FPWV *addr = (FPWV *) (info->start[sect]);
 			FPW status;

 			printf ("Erasing sector %2d ... ", sect);

 			flash_unprotect_sectors (addr);

 			/* arm simple, non interrupt dependent timer */
 			reset_timer_masked ();

 			*addr = (FPW) 0x00500050;/* clear status register */
 			*addr = (FPW) 0x00200020;/* erase setup */
 			*addr = (FPW) 0x00D000D0;/* erase confirm */

 			while (((status =
 				*addr) & (FPW) 0x00800080) !=
 				(FPW) 0x00800080) {
 					if (get_timer_masked () >
 					CFG_FLASH_ERASE_TOUT) {
 					printf ("Timeout\n");
 					/* suspend erase     */
 					*addr = (FPW) 0x00B000B0;
 					/* reset to read mode */
 					*addr = (FPW) 0x00FF00FF;
 					rcode = 1;
 					break;
 				}
 			}

 			/* clear status register cmd.	*/
 			*addr = (FPW) 0x00500050;
 			*addr = (FPW) 0x00FF00FF;/* resest to read mode */
 			printf (" done\n");
 		}
 	}
 	return rcode;
 }

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

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

 	if (info->flash_id == FLASH_UNKNOWN) {
 		return 4;
 	}
 /* get lower word aligned address */
 #ifdef FLASH_PORT_WIDTH16
 	wp = (addr & ~1);
 	port_width = 2;
 #else
 	wp = (addr & ~3);
 	port_width = 4;
 #endif

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

 		if ((rc = write_data (info, wp, SWAP (data))) != 0) {
 			return (rc);
 		}
 		wp += port_width;
 	}

 	/*
 	 * handle word aligned part
 	 */
 	count = 0;
 	while (cnt >= port_width) {
 		data = 0;
 		for (i = 0; i < port_width; ++i) {
 			data = (data << 8) | *src++;
 		}
 		if ((rc = write_data (info, wp, SWAP (data))) != 0) {
 			return (rc);
 		}
 		wp += port_width;
 		cnt -= port_width;
 		if (count++ > 0x800) {
 			spin_wheel ();
 			count = 0;
 		}
 	}

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

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

 	return (write_data (info, wp, SWAP (data)));
 }

 /*-----------------------------------------------------------------------
  * Write a word or halfword to Flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 static int write_data (flash_info_t * info, ulong dest, FPW data)
 {
 	FPWV *addr = (FPWV *) dest;
 	ulong status;
 	int flag;

 	/* Check if Flash is (sufficiently) erased */
 	if ((*addr & data) != data) {
 		printf ("not erased at %08lx (%x)\n", (ulong) addr, *addr);
 		return (2);
 	}
 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts ();
 	*addr = (FPW) 0x00400040;	/* write setup */
 	*addr = data;

 	/* arm simple, non interrupt dependent timer */
 	reset_timer_masked ();

 	/* wait while polling the status register */
 	while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
 		if (get_timer_masked () > CFG_FLASH_WRITE_TOUT) {
 			*addr = (FPW) 0x00FF00FF;	/* restore read mode */
 			return (1);
 		}
 	}
 	*addr = (FPW) 0x00FF00FF;	/* restore read mode */
 	return (0);
 }

 void inline spin_wheel (void)
 {
 	static int p = 0;
 	static char w[] = "\\/-";

 	printf ("\010%c", w[p]);
 	(++p == 3) ? (p = 0) : 0;
 }
	/*
	* (C) Copyright 2001
	* Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
	*
	* (C) Copyright 2001-2004
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* (C) Copyright 2003
	* Texas Instruments, <www.ti.com>
	* Kshitij Gupta <Kshitij@ti.com>

	* (C) Copyright 2004
	* Texas Instruments <www.ti.com>
	* Rishi Bhattacharya
	*
	* 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>

	#define PHYS_FLASH_SECT_SIZE 0x00020000 /* 256 KB sectors (x2) */
	flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */

	/* Board support for 1 or 2 flash devices */
	#undef FLASH_PORT_WIDTH32
	#define FLASH_PORT_WIDTH16

	#ifdef FLASH_PORT_WIDTH16
	#define FLASH_PORT_WIDTH ushort
	#define FLASH_PORT_WIDTHV vu_short
	#define SWAP(x) __swab16(x)
	#else
	#define FLASH_PORT_WIDTH ulong
	#define FLASH_PORT_WIDTHV vu_long
	#define SWAP(x) __swab32(x)
	#endif

	#define FPW FLASH_PORT_WIDTH
	#define FPWV FLASH_PORT_WIDTHV

	#define mb() __asm__ __volatile__ ("" : : : "memory")


	/* Flash Organization Structure */
	typedef struct OrgDef {
	unsigned int sector_number;
	unsigned int sector_size;
	} OrgDef;


	/* Flash Organizations */
	OrgDef OrgIntel_28F256L18T[] = {
	{4, 32 * 1024}, /* 4 * 32kBytes sectors */
	{255, 128 * 1024}, /* 255 * 128kBytes sectors */
	};


	/*-----------------------------------------------------------------------
	* Functions
	*/
	unsigned long flash_init (void);
	static ulong flash_get_size (FPW * addr, flash_info_t * info);
	static int write_data (flash_info_t * info, ulong dest, FPW data);
	static void flash_get_offsets (ulong base, flash_info_t * info);
	void inline spin_wheel (void);
	void flash_print_info (flash_info_t * info);
	void flash_unprotect_sectors (FPWV * addr);
	int flash_erase (flash_info_t * info, int s_first, int s_last);
	int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt);

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

	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 ((FPW *) PHYS_FLASH_1, &flash_info[i]);
	flash_get_offsets (PHYS_FLASH_1, &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;
	OrgDef *pOrgDef;

	pOrgDef = OrgIntel_28F256L18T;
	if (info->flash_id == FLASH_UNKNOWN) {
	return;
	}

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
	for (i = 0; i < info->sector_count; i++) {
	if (i > 255) {
	info->start[i] = base + (i * 0x8000);
	info->protect[i] = 0;
	} else {
	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_INTEL:
	printf ("INTEL ");
	break;
	default:
	printf ("Unknown Vendor ");
	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F256L18T:
	printf ("FLASH 28F256L18T\n");
	break;
	case FLASH_28F128J3A:
	printf ("FLASH 28F128J3A\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 (FPW * addr, flash_info_t * info)
	{
	volatile FPW value;

	/* Write auto select command: read Manufacturer ID */
	addr[0x5555] = (FPW) 0x00AA00AA;
	addr[0x2AAA] = (FPW) 0x00550055;
	addr[0x5555] = (FPW) 0x00900090;

	mb ();
	value = addr[0];

	switch (value) {

	case (FPW) INTEL_MANUFACT:
	info->flash_id = FLASH_MAN_INTEL;
	break;
	case (FPW) MT2_MANUFACT:
	info->flash_id = FLASH_MAN_INTEL;
	break;

	default:
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	addr[0] = (FPW) 0x00FF00FF; /* restore read mode */
	return (0); /* no or unknown flash */
	}

	mb ();
	value = addr[1]; /* device ID */
	switch (value) {

	case (FPW) (INTEL_ID_28F256L18T):
	info->flash_id += FLASH_28F256L18T;
	info->sector_count = 259;
	info->size = 0x02000000;
	break; /* => 32 MB */

	case (FPW) (INTEL_ID_28F256K3):
	info->flash_id +=FLASH_28F256K3;
	info->sector_count = 259;
	info->size = 0x02000000;
	debug ("Intel StrataFlash 28F256K3C device initialized\n");
	break; /* => 32 MB */

	case (FPW) (INTEL_ID_28F128J3A):
	info->flash_id +=FLASH_28F128J3A;
	info->sector_count = 259;
	info->size = 0x02000000;
	debug ("Micron StrataFlash MT28F128J3 device initialized\n");
	break; /* => 32 MB */

	default:
	info->flash_id = FLASH_UNKNOWN;
	break;
	}

	if (info->sector_count > CFG_MAX_FLASH_SECT) {
	printf (" ERROR: sector count %d > max (%d) \n",
	info->sector_count, CFG_MAX_FLASH_SECT);
	info->sector_count = CFG_MAX_FLASH_SECT;
	}

	addr[0] = (FPW) 0x00FF00FF; /* restore read mode */

	return (info->size);
	}


	/* unprotects a sector for write and erase
	* on some intel parts, this unprotects the entire chip, but it
	* wont hurt to call this additional times per sector...
	*/
	void flash_unprotect_sectors (FPWV * addr)
	{
	#define PD_FINTEL_WSMS_READY_MASK 0x0080

	FPW status;

	addr = (FPW) 0x00500050; / clear status register */

	/* this sends the clear lock bit command */
	*addr = (FPW) 0x00600060;
	*addr = (FPW) 0x00D000D0;

	while (((status =*addr) & (FPW) 0x00800080) != (FPW) 0x00800080);

	*addr = (FPW) 0x00FF00FF;

	}


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

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

	type = (info->flash_id & FLASH_VENDMASK);
	if ((type != FLASH_MAN_INTEL)) {
	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;

	/* 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 */
	FPWV addr = (FPWV ) (info->start[sect]);
	FPW status;

	printf ("Erasing sector %2d ... ", sect);

	flash_unprotect_sectors (addr);

	/* arm simple, non interrupt dependent timer */
	reset_timer_masked ();

	addr = (FPW) 0x00500050;/ clear status register */
	addr = (FPW) 0x00200020;/ erase setup */
	addr = (FPW) 0x00D000D0;/ erase confirm */

	while (((status =
	*addr) & (FPW) 0x00800080) !=
	(FPW) 0x00800080) {
	if (get_timer_masked () >
	CFG_FLASH_ERASE_TOUT) {
	printf ("Timeout\n");
	/* suspend erase */
	*addr = (FPW) 0x00B000B0;
	/* reset to read mode */
	*addr = (FPW) 0x00FF00FF;
	rcode = 1;
	break;
	}
	}

	/* clear status register cmd. */
	*addr = (FPW) 0x00500050;
	addr = (FPW) 0x00FF00FF;/ resest to read mode */
	printf (" done\n");
	}
	}
	return rcode;
	}

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

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

	if (info->flash_id == FLASH_UNKNOWN) {
	return 4;
	}
	/* get lower word aligned address */
	#ifdef FLASH_PORT_WIDTH16
	wp = (addr & ~1);
	port_width = 2;
	#else
	wp = (addr & ~3);
	port_width = 4;
	#endif

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

	if ((rc = write_data (info, wp, SWAP (data))) != 0) {
	return (rc);
	}
	wp += port_width;
	}

	/*
	* handle word aligned part
	*/
	count = 0;
	while (cnt >= port_width) {
	data = 0;
	for (i = 0; i < port_width; ++i) {
	data = (data << 8) \| *src++;
	}
	if ((rc = write_data (info, wp, SWAP (data))) != 0) {
	return (rc);
	}
	wp += port_width;
	cnt -= port_width;
	if (count++ > 0x800) {
	spin_wheel ();
	count = 0;
	}
	}

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

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

	return (write_data (info, wp, SWAP (data)));
	}

	/*-----------------------------------------------------------------------
	* Write a word or halfword to Flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	static int write_data (flash_info_t * info, ulong dest, FPW data)
	{
	FPWV addr = (FPWV ) dest;
	ulong status;
	int flag;

	/* Check if Flash is (sufficiently) erased */
	if ((*addr & data) != data) {
	printf ("not erased at %08lx (%x)\n", (ulong) addr, *addr);
	return (2);
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts ();
	addr = (FPW) 0x00400040; / write setup */
	*addr = data;

	/* arm simple, non interrupt dependent timer */
	reset_timer_masked ();

	/* wait while polling the status register */
	while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
	if (get_timer_masked () > CFG_FLASH_WRITE_TOUT) {
	addr = (FPW) 0x00FF00FF; / restore read mode */
	return (1);
	}
	}
	addr = (FPW) 0x00FF00FF; / restore read mode */
	return (0);
	}

	void inline spin_wheel (void)
	{
	static int p = 0;
	static char w[] = "\\/-";

	printf ("\010%c", w[p]);
	(++p == 3) ? (p = 0) : 0;
	}