board/rpxsuper/flash.c - u-boot - Git at Google

 /*
  * (C) Copyright 2000
  * Marius Groeger <mgroeger@sysgo.de>
  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
  *
  * (C) Copyright 2000
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * Flash Routines for AMD 29F080B devices
  * Added support for 64bit and AMD 29DL323B
  *
  *--------------------------------------------------------------------
  * 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 <mpc8xx.h>
 #include <asm/io.h>

 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];

 #define RD_SWP32(x) in_le32((volatile u32*)x)

 /*-----------------------------------------------------------------------
  * 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);

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

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

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

     /* for now, only support the 4 MB Flash SIMM */
     size = flash_get_size((vu_long *)CONFIG_SYS_FLASH0_BASE, &flash_info[0]);

     /*
      * protect monitor and environment sectors
      */

 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH0_BASE
     flash_protect(FLAG_PROTECT_SET,
 		  CONFIG_SYS_MONITOR_BASE,
 		  CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
 		  &flash_info[0]);
 #endif

 #if defined(CONFIG_ENV_IS_IN_FLASH) && defined(CONFIG_ENV_ADDR)
 # ifndef  CONFIG_ENV_SIZE
 #  define CONFIG_ENV_SIZE	CONFIG_ENV_SECT_SIZE
 # endif
     flash_protect(FLAG_PROTECT_SET,
 		  CONFIG_ENV_ADDR,
 		  CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
 		  &flash_info[0]);
 #endif

     return /*size*/ (CONFIG_SYS_FLASH0_SIZE * 1024 * 1024);
 }

 /*-----------------------------------------------------------------------
  */
 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 (AMD_MANUFACT & FLASH_VENDMASK):
 	printf ("AMD ");
 	break;
     case (FUJ_MANUFACT & FLASH_VENDMASK):
 	printf ("FUJITSU ");
 	break;
     case (SST_MANUFACT & FLASH_VENDMASK):
 	printf ("SST ");
 	break;
     default:
 	printf ("Unknown Vendor ");
 	break;
     }

     switch (info->flash_id & FLASH_TYPEMASK) {
     case (AMD_ID_DL323B & FLASH_TYPEMASK):
 	printf("AM29DL323B (32 MBit)\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;
     vu_long vendor[2], devid[2];
     ulong base = (ulong)addr;

     /* Reset and Write auto select command: read Manufacturer ID */
     addr[0] = 0xf0f0f0f0;
     addr[2 * 0x0555] = 0xAAAAAAAA;
     addr[2 * 0x02AA] = 0x55555555;
     addr[2 * 0x0555] = 0x90909090;
     addr[1] = 0xf0f0f0f0;
     addr[2 * 0x0555 + 1] = 0xAAAAAAAA;
     addr[2 * 0x02AA + 1] = 0x55555555;
     addr[2 * 0x0555 + 1] = 0x90909090;
     udelay (1000);

     vendor[0] = RD_SWP32(&addr[0]);
     vendor[1] = RD_SWP32(&addr[1]);
     if (vendor[0] != vendor[1] || vendor[0] != AMD_MANUFACT) {
 	info->size = 0;
 	goto out;
     }

     devid[0] = RD_SWP32(&addr[2]);
     devid[1] = RD_SWP32(&addr[3]);

     if (devid[0] == AMD_ID_DL323B) {
 	/*
 	* we have 2 Banks
 	* Bank 1 (23 Sectors): 0-7=8kbyte, 8-22=64kbyte
 	* Bank 2 (48 Sectors): 23-70=64kbyte
 	*/
 	info->flash_id     = (AMD_MANUFACT & FLASH_VENDMASK) |
 			     (AMD_ID_DL323B & FLASH_TYPEMASK);
 	info->sector_count = 71;
 	info->size         = 4 * (8 * 8 + 63 * 64) * 1024;
     }
     else {
 	info->size = 0;
 	goto out;
     }

     /* set up sector start address table */
     for (i = 0; i < 8; i++) {
 	info->start[i] = base + (i * 0x8000);
     }
     for (i = 8; i < info->sector_count; i++) {
 	info->start[i] = base + (i * 0x40000) + 8 * 0x8000 - 8 * 0x40000;
     }

     /* check for protected sectors */
     for (i = 0; i < info->sector_count; i++) {
 	/* read sector protection at sector address */
 	addr = (volatile unsigned long *)(info->start[i]);
 	addr[2 * 0x0555] = 0xAAAAAAAA;
 	addr[2 * 0x02AA] = 0x55555555;
 	addr[2 * 0x0555] = 0x90909090;
 	addr[2 * 0x0555 + 1] = 0xAAAAAAAA;
 	addr[2 * 0x02AA + 1] = 0x55555555;
 	addr[2 * 0x0555 + 1] = 0x90909090;
 	udelay (1000);
 	base = RD_SWP32(&addr[4]);
 	base |= RD_SWP32(&addr[5]);
 	info->protect[i] = base & 0x00010001 ? 1 : 0;
     }
     addr = (vu_long*)info->start[0];

 out:
     /* reset command */
     addr[0] = 0xf0f0f0f0;
     addr[1] = 0xf0f0f0f0;

     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;

     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;
     }

     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[2 * 0x0555] = 0xAAAAAAAA;
     addr[2 * 0x02AA] = 0x55555555;
     addr[2 * 0x0555] = 0x80808080;
     addr[2 * 0x0555] = 0xAAAAAAAA;
     addr[2 * 0x02AA] = 0x55555555;
     addr[2 * 0x0555 + 1] = 0xAAAAAAAA;
     addr[2 * 0x02AA + 1] = 0x55555555;
     addr[2 * 0x0555 + 1] = 0x80808080;
     addr[2 * 0x0555 + 1] = 0xAAAAAAAA;
     addr[2 * 0x02AA + 1] = 0x55555555;
     udelay (100);

     /* 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] = 0x30303030;
 	    addr[1] = 0x30303030;
 	    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] & 0x80808080) != 0x80808080 ||
 		(addr[1] & 0x80808080) != 0x80808080) {
 	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 */
 	    serial_putc ('.');
 	    last = now;
 	}
     }

     DONE:
     /* reset to read mode */
     addr = (volatile unsigned long *)info->start[0];
     addr[0] = 0xF0F0F0F0;	/* reset bank */
     addr[1] = 0xF0F0F0F0;	/* 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, data)) != 0) {
 	    return (rc);
 	}
 	wp += 4;
     }

     /*
      * handle word aligned part
      */
     while (cnt >= 4) {
 	data = 0;
 	for (i=0; i<4; ++i) {
 	    data = (data << 8) | *src++;
 	}
 	if ((rc = write_word(info, wp, data)) != 0) {
 	    return (rc);
 	}
 	wp  += 4;
 	cnt -= 4;
     }

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

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

     return (write_word(info, wp, data));
 }

 /*-----------------------------------------------------------------------
  * Write a word to Flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 static int write_word (flash_info_t *info, ulong dest, ulong data)
 {
     vu_long *addr = (vu_long*)(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();

     if ((dest & 0x00000004) == 0) {
 	addr[2 * 0x0555] = 0xAAAAAAAA;
 	addr[2 * 0x02AA] = 0x55555555;
 	addr[2 * 0x0555] = 0xA0A0A0A0;
     }
     else {
 	addr[2 * 0x0555 + 1] = 0xAAAAAAAA;
 	addr[2 * 0x02AA + 1] = 0x55555555;
 	addr[2 * 0x0555 + 1] = 0xA0A0A0A0;
     }

     *((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) & 0x80808080) != (data & 0x80808080)) {
 	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 	    return (1);
 	}
     }
     return (0);
 }

 /*-----------------------------------------------------------------------
  */
	/*
	* (C) Copyright 2000
	* Marius Groeger <mgroeger@sysgo.de>
	* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	*
	* (C) Copyright 2000
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* Flash Routines for AMD 29F080B devices
	* Added support for 64bit and AMD 29DL323B
	*
	*--------------------------------------------------------------------
	* 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 <mpc8xx.h>
	#include <asm/io.h>

	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];

	#define RD_SWP32(x) in_le32((volatile u32*)x)

	/*-----------------------------------------------------------------------
	* 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);

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

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

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

	/* for now, only support the 4 MB Flash SIMM */
	size = flash_get_size((vu_long *)CONFIG_SYS_FLASH0_BASE, &flash_info[0]);

	/*
	* protect monitor and environment sectors
	*/

	#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH0_BASE
	flash_protect(FLAG_PROTECT_SET,
	CONFIG_SYS_MONITOR_BASE,
	CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
	&flash_info[0]);
	#endif

	#if defined(CONFIG_ENV_IS_IN_FLASH) && defined(CONFIG_ENV_ADDR)
	# ifndef CONFIG_ENV_SIZE
	# define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
	# endif
	flash_protect(FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
	&flash_info[0]);
	#endif

	return /size/ (CONFIG_SYS_FLASH0_SIZE * 1024 * 1024);
	}

	/*-----------------------------------------------------------------------
	*/
	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 (AMD_MANUFACT & FLASH_VENDMASK):
	printf ("AMD ");
	break;
	case (FUJ_MANUFACT & FLASH_VENDMASK):
	printf ("FUJITSU ");
	break;
	case (SST_MANUFACT & FLASH_VENDMASK):
	printf ("SST ");
	break;
	default:
	printf ("Unknown Vendor ");
	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case (AMD_ID_DL323B & FLASH_TYPEMASK):
	printf("AM29DL323B (32 MBit)\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;
	vu_long vendor[2], devid[2];
	ulong base = (ulong)addr;

	/* Reset and Write auto select command: read Manufacturer ID */
	addr[0] = 0xf0f0f0f0;
	addr[2 * 0x0555] = 0xAAAAAAAA;
	addr[2 * 0x02AA] = 0x55555555;
	addr[2 * 0x0555] = 0x90909090;
	addr[1] = 0xf0f0f0f0;
	addr[2 * 0x0555 + 1] = 0xAAAAAAAA;
	addr[2 * 0x02AA + 1] = 0x55555555;
	addr[2 * 0x0555 + 1] = 0x90909090;
	udelay (1000);

	vendor[0] = RD_SWP32(&addr[0]);
	vendor[1] = RD_SWP32(&addr[1]);
	if (vendor[0] != vendor[1] \|\| vendor[0] != AMD_MANUFACT) {
	info->size = 0;
	goto out;
	}

	devid[0] = RD_SWP32(&addr[2]);
	devid[1] = RD_SWP32(&addr[3]);

	if (devid[0] == AMD_ID_DL323B) {
	/*
	* we have 2 Banks
	* Bank 1 (23 Sectors): 0-7=8kbyte, 8-22=64kbyte
	* Bank 2 (48 Sectors): 23-70=64kbyte
	*/
	info->flash_id = (AMD_MANUFACT & FLASH_VENDMASK) \|
	(AMD_ID_DL323B & FLASH_TYPEMASK);
	info->sector_count = 71;
	info->size = 4 * (8 * 8 + 63 * 64) * 1024;
	}
	else {
	info->size = 0;
	goto out;
	}

	/* set up sector start address table */
	for (i = 0; i < 8; i++) {
	info->start[i] = base + (i * 0x8000);
	}
	for (i = 8; i < info->sector_count; i++) {
	info->start[i] = base + (i * 0x40000) + 8 * 0x8000 - 8 * 0x40000;
	}

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
	/* read sector protection at sector address */
	addr = (volatile unsigned long *)(info->start[i]);
	addr[2 * 0x0555] = 0xAAAAAAAA;
	addr[2 * 0x02AA] = 0x55555555;
	addr[2 * 0x0555] = 0x90909090;
	addr[2 * 0x0555 + 1] = 0xAAAAAAAA;
	addr[2 * 0x02AA + 1] = 0x55555555;
	addr[2 * 0x0555 + 1] = 0x90909090;
	udelay (1000);
	base = RD_SWP32(&addr[4]);
	base \|= RD_SWP32(&addr[5]);
	info->protect[i] = base & 0x00010001 ? 1 : 0;
	}
	addr = (vu_long*)info->start[0];

	out:
	/* reset command */
	addr[0] = 0xf0f0f0f0;
	addr[1] = 0xf0f0f0f0;

	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;

	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;
	}

	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[2 * 0x0555] = 0xAAAAAAAA;
	addr[2 * 0x02AA] = 0x55555555;
	addr[2 * 0x0555] = 0x80808080;
	addr[2 * 0x0555] = 0xAAAAAAAA;
	addr[2 * 0x02AA] = 0x55555555;
	addr[2 * 0x0555 + 1] = 0xAAAAAAAA;
	addr[2 * 0x02AA + 1] = 0x55555555;
	addr[2 * 0x0555 + 1] = 0x80808080;
	addr[2 * 0x0555 + 1] = 0xAAAAAAAA;
	addr[2 * 0x02AA + 1] = 0x55555555;
	udelay (100);

	/* 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] = 0x30303030;
	addr[1] = 0x30303030;
	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] & 0x80808080) != 0x80808080 \|\|
	(addr[1] & 0x80808080) != 0x80808080) {
	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 */
	serial_putc ('.');
	last = now;
	}
	}

	DONE:
	/* reset to read mode */
	addr = (volatile unsigned long *)info->start[0];
	addr[0] = 0xF0F0F0F0; /* reset bank */
	addr[1] = 0xF0F0F0F0; /* 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, data)) != 0) {
	return (rc);
	}
	wp += 4;
	}

	/*
	* handle word aligned part
	*/
	while (cnt >= 4) {
	data = 0;
	for (i=0; i<4; ++i) {
	data = (data << 8) \| *src++;
	}
	if ((rc = write_word(info, wp, data)) != 0) {
	return (rc);
	}
	wp += 4;
	cnt -= 4;
	}

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

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

	return (write_word(info, wp, data));
	}

	/*-----------------------------------------------------------------------
	* Write a word to Flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	static int write_word (flash_info_t *info, ulong dest, ulong data)
	{
	vu_long addr = (vu_long)(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();

	if ((dest & 0x00000004) == 0) {
	addr[2 * 0x0555] = 0xAAAAAAAA;
	addr[2 * 0x02AA] = 0x55555555;
	addr[2 * 0x0555] = 0xA0A0A0A0;
	}
	else {
	addr[2 * 0x0555 + 1] = 0xAAAAAAAA;
	addr[2 * 0x02AA + 1] = 0x55555555;
	addr[2 * 0x0555 + 1] = 0xA0A0A0A0;
	}

	((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) & 0x80808080) != (data & 0x80808080)) {
	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
	return (1);
	}
	}
	return (0);
	}

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