board/sc520_cdp/flash_old.c - filogic/uboot - Gitiles

 /*
  * (C) Copyright 2002
  * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
  *
  * (C) Copyright 2002
  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  * Alex Zuepke <azu@sysgo.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 <asm/io.h>

 ulong myflush(void);


 #define SC520_MAX_FLASH_BANKS  3
 #define SC520_FLASH_BANK0_BASE 0x38000000  /* BOOTCS */
 #define SC520_FLASH_BANK1_BASE 0x30000000  /* ROMCS0 */
 #define SC520_FLASH_BANK2_BASE 0x28000000  /* ROMCS1 */
 #define SC520_FLASH_BANKSIZE   0x8000000

 #define AMD29LV016_SIZE        0x200000
 #define AMD29LV016_SECTORS     32

 flash_info_t    flash_info[SC520_MAX_FLASH_BANKS];

 #define CMD_READ_ARRAY		0x00F000F0
 #define CMD_UNLOCK1		0x00AA00AA
 #define CMD_UNLOCK2		0x00550055
 #define CMD_ERASE_SETUP		0x00800080
 #define CMD_ERASE_CONFIRM	0x00300030
 #define CMD_PROGRAM		0x00A000A0
 #define CMD_UNLOCK_BYPASS	0x00200020


 #define BIT_ERASE_DONE		0x00800080
 #define BIT_RDY_MASK		0x00800080
 #define BIT_PROGRAM_ERROR	0x00200020
 #define BIT_TIMEOUT		0x80000000 /* our flag */

 #define READY 1
 #define ERR   2
 #define TMO   4

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

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

 	for (i = 0; i < SC520_MAX_FLASH_BANKS; i++) {
 		ulong flashbase = 0;
 		int sectsize = 0;
 		if (i==0 || i==2) {
 			/* FixMe: this assumes that bank 0 and 2
 			 * are mapped to the two 8Mb banks */
 			flash_info[i].flash_id =
 				(AMD_MANUFACT & FLASH_VENDMASK) |
 				(AMD_ID_LV016B & FLASH_TYPEMASK);

 			flash_info[i].size = AMD29LV016_SIZE*4;
 			flash_info[i].sector_count = AMD29LV016_SECTORS;
 			sectsize = (AMD29LV016_SIZE*4)/AMD29LV016_SECTORS;
 		} else {
 			/* FixMe: this assumes that bank1 is unmapped
 			 * (or mapped to the same flash bank as BOOTCS) */
 			flash_info[i].flash_id = 0;
 			flash_info[i].size = 0;
 			flash_info[i].sector_count = 0;
 			sectsize=0;
 		}
 		memset(flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
 		switch (i) {
 		case 0:
 			flashbase = SC520_FLASH_BANK0_BASE;
 			break;
 		case 1:
 			flashbase = SC520_FLASH_BANK1_BASE;
 			break;
 		case 2:
 			flashbase = SC520_FLASH_BANK0_BASE;
 			break;
 		default:
 			panic("configured to many flash banks!\n");
 		}

 		for (j = 0; j < flash_info[i].sector_count; j++) {
 			flash_info[i].start[j] = sectsize;
 			flash_info[i].start[j] = flashbase + j * sectsize;
 		}
 		size += flash_info[i].size;
 	}

 	/*
 	 * Protect monitor and environment sectors
 	 */
 	flash_protect(FLAG_PROTECT_SET,
 		      i386boot_start-SC520_FLASH_BANK0_BASE,
 		      i386boot_end-SC520_FLASH_BANK0_BASE,
 		      &flash_info[0]);

 #ifdef CFG_ENV_ADDR
 	flash_protect(FLAG_PROTECT_SET,
 		      CFG_ENV_ADDR,
 		      CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
 		      &flash_info[0]);
 #endif
 	return size;
 }

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

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

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case (AMD_ID_LV016B & FLASH_TYPEMASK):
 		printf("4x Amd29LV016B (16Mbit)\n");
 		break;
 	default:
 		printf("Unknown Chip Type\n");
 		goto done;
 		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");

 	done:
 }

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

 int flash_erase(flash_info_t *info, int s_first, int s_last)
 {
 	ulong result;
 	int iflag, prot, sect;
 	int rc = ERR_OK;
 	int chip1, chip2;

 	/* first look for protection bits */

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

 	if ((s_first < 0) || (s_first > s_last)) {
 		return ERR_INVAL;
 	}

 	if ((info->flash_id & FLASH_VENDMASK) !=
 	    (AMD_MANUFACT & FLASH_VENDMASK)) {
 		return ERR_UNKNOWN_FLASH_VENDOR;
 	}

 	prot = 0;
 	for (sect=s_first; sect<=s_last; ++sect) {
 		if (info->protect[sect]) {
 			prot++;
 		}
 	}
 	if (prot) {
 		return ERR_PROTECTED;
 	}

 	/*
 	 * Disable interrupts which might cause a timeout
 	 * here. Remember that our exception vectors are
 	 * at address 0 in the flash, and we don't want a
 	 * (ticker) exception to happen while the flash
 	 * chip is in programming mode.
 	 */
 	iflag = disable_interrupts();

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect<=s_last && !ctrlc(); sect++) {
 		printf("Erasing sector %2d ... ", sect);

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

 		if (info->protect[sect] == 0) {
 			/* not protected */
 			ulong addr = info->start[sect];

 			writel(CMD_UNLOCK1, addr + 1);
 			writel(CMD_UNLOCK2, addr + 2);
 			writel(CMD_ERASE_SETUP, addr + 1);

 			writel(CMD_UNLOCK1, addr + 1);
 			writel(CMD_UNLOCK2, addr + 2);
 			writel(CMD_ERASE_CONFIRM, addr);


 			/* wait until flash is ready */
 			chip1 = chip2 = 0;

 			do {
 				result = readl(addr);

 				/* check timeout */
 				if (get_timer(0) > CFG_FLASH_ERASE_TOUT) {
 					writel(CMD_READ_ARRAY, addr + 1);
 					chip1 = TMO;
 					break;
 				}

 				if (!chip1 && (result & 0xFFFF) & BIT_ERASE_DONE) {
 					chip1 = READY;
 				}

 				if (!chip1 && (result & 0xFFFF) & BIT_PROGRAM_ERROR) {
 					chip1 = ERR;
 				}

 				if (!chip2 && (result >> 16) & BIT_ERASE_DONE) {
 					chip2 = READY;
 				}

 				if (!chip2 && (result >> 16) & BIT_PROGRAM_ERROR) {
 					chip2 = ERR;
 				}

 			}  while (!chip1 || !chip2);

 			writel(CMD_READ_ARRAY, addr + 1);

 			if (chip1 == ERR || chip2 == ERR) {
 				rc = ERR_PROG_ERROR;
 				goto outahere;
 			}

 			if (chip1 == TMO) {
 				rc = ERR_TIMOUT;
 				goto outahere;
 			}

 			printf("ok.\n");
 		} else { /* it was protected */

 			printf("protected!\n");
 		}
 	}

 	if (ctrlc()) {
 		printf("User Interrupt!\n");
 	}

 outahere:
 	/* allow flash to settle - wait 10 ms */
 	udelay(10000);

 	if (iflag) {
 		enable_interrupts();
 	}

 	return rc;
 }

 /*-----------------------------------------------------------------------
  * Copy memory to flash
  */

 volatile static int write_word(flash_info_t *info, ulong dest, ulong data)
 {
 	ulong addr = dest;
 	ulong result;
 	int rc = ERR_OK;
 	int iflag;
 	int chip1, chip2;

 	/*
 	 * Check if Flash is (sufficiently) erased
 	 */
 	result = readl(addr);
 	if ((result & data) != data) {
 		return ERR_NOT_ERASED;
 	}

 	/*
 	 * Disable interrupts which might cause a timeout
 	 * here. Remember that our exception vectors are
 	 * at address 0 in the flash, and we don't want a
 	 * (ticker) exception to happen while the flash
 	 * chip is in programming mode.
 	 */
 	iflag = disable_interrupts();

 	writel(CMD_UNLOCK1, addr + 1);
 	writel(CMD_UNLOCK2, addr + 2);
 	writel(CMD_UNLOCK_BYPASS, addr + 1);
 	writel(addr, CMD_PROGRAM);
 	writel(addr, data);

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

 	/* wait until flash is ready */
 	chip1 = chip2 = 0;
 	do {
 		result = readl(addr);

 		/* check timeout */
 		if (get_timer(0) > CFG_FLASH_ERASE_TOUT) {
 			chip1 = ERR | TMO;
 			break;
 		}

 		if (!chip1 && ((result & 0x80) == (data & 0x80))) {
 			chip1 = READY;
 		}

 		if (!chip1 && ((result & 0xFFFF) & BIT_PROGRAM_ERROR)) {
 			result = readl(addr);

 			if ((result & 0x80) == (data & 0x80)) {
 				chip1 = READY;
 			} else {
 				chip1 = ERR;
 			}
 		}

 		if (!chip2 && ((result & (0x80 << 16)) == (data & (0x80 << 16)))) {
 			chip2 = READY;
 		}

 		if (!chip2 && ((result >> 16) & BIT_PROGRAM_ERROR)) {
 			result = readl(addr);

 			if ((result & (0x80 << 16)) == (data & (0x80 << 16))) {
 				chip2 = READY;
 			} else {
 				chip2 = ERR;
 			}
 		}

 	}  while (!chip1 || !chip2);

 	writel(CMD_READ_ARRAY, addr);

 	if (chip1 == ERR || chip2 == ERR || readl(addr) != data) {
 		rc = ERR_PROG_ERROR;
 	}

 	if (iflag) {
 		enable_interrupts();
 	}

 	return rc;
 }

 /*-----------------------------------------------------------------------
  * Copy memory to flash.
  */

 int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 {
 	ulong cp, wp, data;
 	int l;
 	int i, 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 << 24);
 		}
 		for (; i<4 && cnt>0; ++i) {
 			data = (data >> 8) | (*src++ << 24);
 			--cnt;
 			++cp;
 		}
 		for (; cnt==0 && i<4; ++i, ++cp) {
 			data = (data >> 8) | (*(uchar *)cp << 24);
 		}

 		if ((rc = write_word(info, wp, data)) != 0) {
 			return rc;
 		}
 		wp += 4;
 	}

 	/*
 	 * handle word aligned part
 	 */
 	while (cnt >= 4) {
 		data = *((vu_long*)src);
 		if ((rc = write_word(info, wp, data)) != 0) {
 			return rc;
 		}
 		src += 4;
 		wp  += 4;
 		cnt -= 4;
 	}

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

 	/*
 	 * handle unaligned tail bytes
 	 */
 	data = 0;
 	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 		data = (data >> 8) | (*src++ << 24);
 		--cnt;
 	}
 	for (; i<4; ++i, ++cp) {
 		data = (data >> 8) | (*(uchar *)cp << 24);
 	}

 	return write_word(info, wp, data);
 }
	/*
	* (C) Copyright 2002
	* Daniel Engström, Omicron Ceti AB, daniel@omicron.se
	*
	* (C) Copyright 2002
	* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	* Alex Zuepke <azu@sysgo.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 <asm/io.h>

	ulong myflush(void);


	#define SC520_MAX_FLASH_BANKS 3
	#define SC520_FLASH_BANK0_BASE 0x38000000 /* BOOTCS */
	#define SC520_FLASH_BANK1_BASE 0x30000000 /* ROMCS0 */
	#define SC520_FLASH_BANK2_BASE 0x28000000 /* ROMCS1 */
	#define SC520_FLASH_BANKSIZE 0x8000000

	#define AMD29LV016_SIZE 0x200000
	#define AMD29LV016_SECTORS 32

	flash_info_t flash_info[SC520_MAX_FLASH_BANKS];

	#define CMD_READ_ARRAY 0x00F000F0
	#define CMD_UNLOCK1 0x00AA00AA
	#define CMD_UNLOCK2 0x00550055
	#define CMD_ERASE_SETUP 0x00800080
	#define CMD_ERASE_CONFIRM 0x00300030
	#define CMD_PROGRAM 0x00A000A0
	#define CMD_UNLOCK_BYPASS 0x00200020


	#define BIT_ERASE_DONE 0x00800080
	#define BIT_RDY_MASK 0x00800080
	#define BIT_PROGRAM_ERROR 0x00200020
	#define BIT_TIMEOUT 0x80000000 /* our flag */

	#define READY 1
	#define ERR 2
	#define TMO 4

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

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

	for (i = 0; i < SC520_MAX_FLASH_BANKS; i++) {
	ulong flashbase = 0;
	int sectsize = 0;
	if (i==0 \|\| i==2) {
	/* FixMe: this assumes that bank 0 and 2
	* are mapped to the two 8Mb banks */
	flash_info[i].flash_id =
	(AMD_MANUFACT & FLASH_VENDMASK) \|
	(AMD_ID_LV016B & FLASH_TYPEMASK);

	flash_info[i].size = AMD29LV016_SIZE*4;
	flash_info[i].sector_count = AMD29LV016_SECTORS;
	sectsize = (AMD29LV016_SIZE*4)/AMD29LV016_SECTORS;
	} else {
	/* FixMe: this assumes that bank1 is unmapped
	* (or mapped to the same flash bank as BOOTCS) */
	flash_info[i].flash_id = 0;
	flash_info[i].size = 0;
	flash_info[i].sector_count = 0;
	sectsize=0;
	}
	memset(flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
	switch (i) {
	case 0:
	flashbase = SC520_FLASH_BANK0_BASE;
	break;
	case 1:
	flashbase = SC520_FLASH_BANK1_BASE;
	break;
	case 2:
	flashbase = SC520_FLASH_BANK0_BASE;
	break;
	default:
	panic("configured to many flash banks!\n");
	}

	for (j = 0; j < flash_info[i].sector_count; j++) {
	flash_info[i].start[j] = sectsize;
	flash_info[i].start[j] = flashbase + j * sectsize;
	}
	size += flash_info[i].size;
	}

	/*
	* Protect monitor and environment sectors
	*/
	flash_protect(FLAG_PROTECT_SET,
	i386boot_start-SC520_FLASH_BANK0_BASE,
	i386boot_end-SC520_FLASH_BANK0_BASE,
	&flash_info[0]);

	#ifdef CFG_ENV_ADDR
	flash_protect(FLAG_PROTECT_SET,
	CFG_ENV_ADDR,
	CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
	&flash_info[0]);
	#endif
	return size;
	}

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

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

	switch (info->flash_id & FLASH_TYPEMASK) {
	case (AMD_ID_LV016B & FLASH_TYPEMASK):
	printf("4x Amd29LV016B (16Mbit)\n");
	break;
	default:
	printf("Unknown Chip Type\n");
	goto done;
	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");

	done:
	}

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

	int flash_erase(flash_info_t *info, int s_first, int s_last)
	{
	ulong result;
	int iflag, prot, sect;
	int rc = ERR_OK;
	int chip1, chip2;

	/* first look for protection bits */

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

	if ((s_first < 0) \|\| (s_first > s_last)) {
	return ERR_INVAL;
	}

	if ((info->flash_id & FLASH_VENDMASK) !=
	(AMD_MANUFACT & FLASH_VENDMASK)) {
	return ERR_UNKNOWN_FLASH_VENDOR;
	}

	prot = 0;
	for (sect=s_first; sect<=s_last; ++sect) {
	if (info->protect[sect]) {
	prot++;
	}
	}
	if (prot) {
	return ERR_PROTECTED;
	}

	/*
	* Disable interrupts which might cause a timeout
	* here. Remember that our exception vectors are
	* at address 0 in the flash, and we don't want a
	* (ticker) exception to happen while the flash
	* chip is in programming mode.
	*/
	iflag = disable_interrupts();

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last && !ctrlc(); sect++) {
	printf("Erasing sector %2d ... ", sect);

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

	if (info->protect[sect] == 0) {
	/* not protected */
	ulong addr = info->start[sect];

	writel(CMD_UNLOCK1, addr + 1);
	writel(CMD_UNLOCK2, addr + 2);
	writel(CMD_ERASE_SETUP, addr + 1);

	writel(CMD_UNLOCK1, addr + 1);
	writel(CMD_UNLOCK2, addr + 2);
	writel(CMD_ERASE_CONFIRM, addr);


	/* wait until flash is ready */
	chip1 = chip2 = 0;

	do {
	result = readl(addr);

	/* check timeout */
	if (get_timer(0) > CFG_FLASH_ERASE_TOUT) {
	writel(CMD_READ_ARRAY, addr + 1);
	chip1 = TMO;
	break;
	}

	if (!chip1 && (result & 0xFFFF) & BIT_ERASE_DONE) {
	chip1 = READY;
	}

	if (!chip1 && (result & 0xFFFF) & BIT_PROGRAM_ERROR) {
	chip1 = ERR;
	}

	if (!chip2 && (result >> 16) & BIT_ERASE_DONE) {
	chip2 = READY;
	}

	if (!chip2 && (result >> 16) & BIT_PROGRAM_ERROR) {
	chip2 = ERR;
	}

	} while (!chip1 \|\| !chip2);

	writel(CMD_READ_ARRAY, addr + 1);

	if (chip1 == ERR \|\| chip2 == ERR) {
	rc = ERR_PROG_ERROR;
	goto outahere;
	}

	if (chip1 == TMO) {
	rc = ERR_TIMOUT;
	goto outahere;
	}

	printf("ok.\n");
	} else { /* it was protected */

	printf("protected!\n");
	}
	}

	if (ctrlc()) {
	printf("User Interrupt!\n");
	}

	outahere:
	/* allow flash to settle - wait 10 ms */
	udelay(10000);

	if (iflag) {
	enable_interrupts();
	}

	return rc;
	}

	/*-----------------------------------------------------------------------
	* Copy memory to flash
	*/

	volatile static int write_word(flash_info_t *info, ulong dest, ulong data)
	{
	ulong addr = dest;
	ulong result;
	int rc = ERR_OK;
	int iflag;
	int chip1, chip2;

	/*
	* Check if Flash is (sufficiently) erased
	*/
	result = readl(addr);
	if ((result & data) != data) {
	return ERR_NOT_ERASED;
	}

	/*
	* Disable interrupts which might cause a timeout
	* here. Remember that our exception vectors are
	* at address 0 in the flash, and we don't want a
	* (ticker) exception to happen while the flash
	* chip is in programming mode.
	*/
	iflag = disable_interrupts();

	writel(CMD_UNLOCK1, addr + 1);
	writel(CMD_UNLOCK2, addr + 2);
	writel(CMD_UNLOCK_BYPASS, addr + 1);
	writel(addr, CMD_PROGRAM);
	writel(addr, data);

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

	/* wait until flash is ready */
	chip1 = chip2 = 0;
	do {
	result = readl(addr);

	/* check timeout */
	if (get_timer(0) > CFG_FLASH_ERASE_TOUT) {
	chip1 = ERR \| TMO;
	break;
	}

	if (!chip1 && ((result & 0x80) == (data & 0x80))) {
	chip1 = READY;
	}

	if (!chip1 && ((result & 0xFFFF) & BIT_PROGRAM_ERROR)) {
	result = readl(addr);

	if ((result & 0x80) == (data & 0x80)) {
	chip1 = READY;
	} else {
	chip1 = ERR;
	}
	}

	if (!chip2 && ((result & (0x80 << 16)) == (data & (0x80 << 16)))) {
	chip2 = READY;
	}

	if (!chip2 && ((result >> 16) & BIT_PROGRAM_ERROR)) {
	result = readl(addr);

	if ((result & (0x80 << 16)) == (data & (0x80 << 16))) {
	chip2 = READY;
	} else {
	chip2 = ERR;
	}
	}

	} while (!chip1 \|\| !chip2);

	writel(CMD_READ_ARRAY, addr);

	if (chip1 == ERR \|\| chip2 == ERR \|\| readl(addr) != data) {
	rc = ERR_PROG_ERROR;
	}

	if (iflag) {
	enable_interrupts();
	}

	return rc;
	}

	/*-----------------------------------------------------------------------
	* Copy memory to flash.
	*/

	int write_buff(flash_info_t info, uchar src, ulong addr, ulong cnt)
	{
	ulong cp, wp, data;
	int l;
	int i, 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 << 24);
	}
	for (; i<4 && cnt>0; ++i) {
	data = (data >> 8) \| (*src++ << 24);
	--cnt;
	++cp;
	}
	for (; cnt==0 && i<4; ++i, ++cp) {
	data = (data >> 8) \| ((uchar )cp << 24);
	}

	if ((rc = write_word(info, wp, data)) != 0) {
	return rc;
	}
	wp += 4;
	}

	/*
	* handle word aligned part
	*/
	while (cnt >= 4) {
	data = ((vu_long)src);
	if ((rc = write_word(info, wp, data)) != 0) {
	return rc;
	}
	src += 4;
	wp += 4;
	cnt -= 4;
	}

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

	/*
	* handle unaligned tail bytes
	*/
	data = 0;
	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
	data = (data >> 8) \| (*src++ << 24);
	--cnt;
	}
	for (; i<4; ++i, ++cp) {
	data = (data >> 8) \| ((uchar )cp << 24);
	}

	return write_word(info, wp, data);
	}