board/ebony/flash.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2002
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (C) Copyright 2002 Jun Gu <jung@artesyncp.com>
  * Add support for Am29F016D and dynamic switch setting.
  *
  * 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
  */

 /*
  * Modified 4/5/2001
  * Wait for completion of each sector erase command issued
  * 4/5/2001
  * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
  */

 #include <common.h>
 #include <ppc4xx.h>
 #include <asm/processor.h>


 #undef DEBUG
 #ifdef DEBUG
 #define DEBUGF(x...) printf(x)
 #else
 #define DEBUGF(x...)
 #endif /* DEBUG */

 #define     BOOT_SMALL_FLASH        32              /* 00100000 */
 #define     FLASH_ONBD_N            2               /* 00000010 */
 #define     FLASH_SRAM_SEL          1               /* 00000001 */

 #define     BOOT_SMALL_FLASH_VAL    4
 #define     FLASH_ONBD_N_VAL        2
 #define     FLASH_SRAM_SEL_VAL      1


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

 static  unsigned    long    flash_addr_table[8][CFG_MAX_FLASH_BANKS] = {
         {0xffc00000, 0xffe00000, 0xff880000},   /* 0:000: configuraton 3 */
         {0xffc00000, 0xffe00000, 0xff800000},   /* 1:001: configuraton 4 */
         {0xffc00000, 0xffe00000, 0x00000000},   /* 2:010: configuraton 7 */
         {0xffc00000, 0xffe00000, 0x00000000},   /* 3:011: configuraton 8 */
         {0xff800000, 0xffa00000, 0xfff80000},   /* 4:100: configuraton 1 */
         {0xff800000, 0xffa00000, 0xfff00000},   /* 5:101: configuraton 2 */
         {0xffc00000, 0xffe00000, 0x00000000},   /* 6:110: configuraton 5 */
         {0xffc00000, 0xffe00000, 0x00000000}    /* 7:111: configuraton 6 */
 };

 /*-----------------------------------------------------------------------
  * 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);
 #if 0
 static void flash_get_offsets (ulong base, flash_info_t *info);
 #endif

 #ifdef CONFIG_ADCIOP
 #define ADDR0           0x0aa9
 #define ADDR1           0x0556
 #define FLASH_WORD_SIZE unsigned char
 #endif

 #ifdef CONFIG_CPCI405
 #define ADDR0           0x5555
 #define ADDR1           0x2aaa
 #define FLASH_WORD_SIZE unsigned short
 #endif

 #ifdef CONFIG_WALNUT405
 #define ADDR0           0x5555
 #define ADDR1           0x2aaa
 #define FLASH_WORD_SIZE unsigned char
 #endif

 #ifdef CONFIG_EBONY
 #define ADDR0           0x5555
 #define ADDR1           0x2aaa
 #define FLASH_WORD_SIZE unsigned char
 #endif

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

 unsigned long flash_init (void) {
 	unsigned long total_b = 0;
 	unsigned long size_b[CFG_MAX_FLASH_BANKS];
 	unsigned char * fpga_base = (unsigned char *)CFG_FPGA_BASE;
 	unsigned char switch_status;
 	unsigned short index = 0;
 	int i;


 	/* read FPGA base register FPGA_REG0 */
 	switch_status = *fpga_base;

 	/* check the bitmap of switch status */
 	if (switch_status & BOOT_SMALL_FLASH) {
 		index += BOOT_SMALL_FLASH_VAL;
 	}
 	if (switch_status & FLASH_ONBD_N) {
 		index += FLASH_ONBD_N_VAL;
 	}
 	if (switch_status & FLASH_SRAM_SEL) {
 		index += FLASH_SRAM_SEL_VAL;
 	}

     DEBUGF("\n");
 	DEBUGF("FLASH: Index: %d\n", index);

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

 		/* check whether the address is 0 */
 		if (flash_addr_table[index][i] == 0) {
 			continue;
 		}

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


 /*-----------------------------------------------------------------------
  */
 #if 0
 static void flash_get_offsets (ulong base, flash_info_t *info)
 {
 	int i;

 	/* set up sector start address table */
 	if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 	    (info->flash_id  == FLASH_AM040) ||
 	    (info->flash_id  == FLASH_AMD016)) {
 		for (i = 0; i < info->sector_count; i++)
 			info->start[i] = base + (i * 0x00010000);
 	} else {
 		if (info->flash_id & FLASH_BTYPE) {
 			/* set sector offsets for bottom boot block type	*/
 			info->start[0] = base + 0x00000000;
 			info->start[1] = base + 0x00004000;
 			info->start[2] = base + 0x00006000;
 			info->start[3] = base + 0x00008000;
 			for (i = 4; i < info->sector_count; i++) {
 				info->start[i] = base + (i * 0x00010000) - 0x00030000;
 			}
 		} else {
 			/* set sector offsets for top boot block type		*/
 			i = info->sector_count - 1;
 			info->start[i--] = base + info->size - 0x00004000;
 			info->start[i--] = base + info->size - 0x00006000;
 			info->start[i--] = base + info->size - 0x00008000;
 			for (; i >= 0; i--) {
 				info->start[i] = base + i * 0x00010000;
 			}
 		}
 	}
 }
 #endif /* 0 */

 /*-----------------------------------------------------------------------
  */
 void flash_print_info  (flash_info_t *info)
 {
 	int i;
         int k;
         int size;
         int erased;
         volatile unsigned long *flash;

 	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;
 	case FLASH_MAN_SST:	printf ("SST ");		break;
 	default:		printf ("Unknown Vendor ");	break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AMD016:	printf ("AM29F016D (16 Mbit, uniform sector size)\n");
 		break;
 	case FLASH_AM040:	printf ("AM29F040 (512 Kbit, uniform sector size)\n");
 		break;
 	case FLASH_AM400B:	printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 		break;
 	case FLASH_AM400T:	printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 		break;
 	case FLASH_AM800B:	printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 		break;
 	case FLASH_AM800T:	printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 		break;
 	case FLASH_AM160B:	printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 		break;
 	case FLASH_AM160T:	printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 		break;
 	case FLASH_AM320B:	printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 		break;
 	case FLASH_AM320T:	printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 		break;
 	case FLASH_SST800A:	printf ("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
 		break;
 	case FLASH_SST160A:	printf ("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
 		break;
 	default:		printf ("Unknown Chip Type\n");
 		break;
 	}

 	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) {
                 /*
                  * Check if whole sector is erased
                  */
                 if (i != (info->sector_count-1))
 			size = info->start[i+1] - info->start[i];
                 else
 			size = info->start[0] + info->size - info->start[i];
                 erased = 1;
                 flash = (volatile unsigned long *)info->start[i];
                 size = size >> 2;        /* divide by 4 for longword access */
                 for (k=0; k<size; k++)
 		{
 			if (*flash++ != 0xffffffff)
 			{
 				erased = 0;
 				break;
 			}
 		}

 		if ((i % 5) == 0)
 			printf ("\n   ");
 			printf (" %08lX%s%s",
 				info->start[i],
 				erased ? " E" : "  ",
 				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;
 			FLASH_WORD_SIZE value;
 			ulong base = (ulong)addr;
 			volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;

             DEBUGF("FLASH ADDR: %08x\n", (unsigned)addr );

 			/* Write auto select command: read Manufacturer ID */
             udelay(10000);
 			addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
             udelay(1000);
 			addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
             udelay(1000);
 			addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;
             udelay(1000);

 #ifdef CONFIG_ADCIOP
 			value = addr2[2];
 #else
 			value = addr2[0];
 #endif

 			DEBUGF("FLASH MANUFACT: %x\n", value);

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

 #ifdef CONFIG_ADCIOP
 			value = addr2[0];			/* device ID		*/
 			debug ("\ndev_code=%x\n", value);
 #else
 			value = addr2[1];			/* device ID		*/
 #endif

 			DEBUGF("\nFLASH DEVICEID: %x\n", value);

 			switch (value) {
 			case (FLASH_WORD_SIZE)AMD_ID_F016D:
 				info->flash_id += FLASH_AMD016;
 				info->sector_count = 32;
 				info->size = 0x00200000;
 				break;				/* => 2 MB		*/
 			case (FLASH_WORD_SIZE)AMD_ID_F040B:
 				info->flash_id += FLASH_AM040;
 				info->sector_count = 8;
 				info->size = 0x0080000; /* => 512 ko */
 				break;
 			case (FLASH_WORD_SIZE)AMD_ID_LV400T:
 				info->flash_id += FLASH_AM400T;
 				info->sector_count = 11;
 				info->size = 0x00080000;
 				break;				/* => 0.5 MB		*/

 			case (FLASH_WORD_SIZE)AMD_ID_LV400B:
 				info->flash_id += FLASH_AM400B;
 				info->sector_count = 11;
 				info->size = 0x00080000;
 				break;				/* => 0.5 MB		*/

 			case (FLASH_WORD_SIZE)AMD_ID_LV800T:
 				info->flash_id += FLASH_AM800T;
 				info->sector_count = 19;
 				info->size = 0x00100000;
 				break;				/* => 1 MB		*/

 			case (FLASH_WORD_SIZE)AMD_ID_LV800B:
 				info->flash_id += FLASH_AM800B;
 				info->sector_count = 19;
 				info->size = 0x00100000;
 				break;				/* => 1 MB		*/

 			case (FLASH_WORD_SIZE)AMD_ID_LV160T:
 				info->flash_id += FLASH_AM160T;
 				info->sector_count = 35;
 				info->size = 0x00200000;
 				break;				/* => 2 MB		*/

 			case (FLASH_WORD_SIZE)AMD_ID_LV160B:
 				info->flash_id += FLASH_AM160B;
 				info->sector_count = 35;
 				info->size = 0x00200000;
 				break;				/* => 2 MB		*/
 #if 0	/* enable when device IDs are available */
 			case (FLASH_WORD_SIZE)AMD_ID_LV320T:
 				info->flash_id += FLASH_AM320T;
 				info->sector_count = 67;
 				info->size = 0x00400000;
 				break;				/* => 4 MB		*/

 			case (FLASH_WORD_SIZE)AMD_ID_LV320B:
 				info->flash_id += FLASH_AM320B;
 				info->sector_count = 67;
 				info->size = 0x00400000;
 				break;				/* => 4 MB		*/
 #endif
 			case (FLASH_WORD_SIZE)SST_ID_xF800A:
 				info->flash_id += FLASH_SST800A;
 				info->sector_count = 16;
 				info->size = 0x00100000;
 				break;				/* => 1 MB		*/

 			case (FLASH_WORD_SIZE)SST_ID_xF160A:
 				info->flash_id += FLASH_SST160A;
 				info->sector_count = 32;
 				info->size = 0x00200000;
 				break;				/* => 2 MB		*/

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

 			}

 			/* set up sector start address table */
 			if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 			    (info->flash_id  == FLASH_AM040) ||
 			    (info->flash_id  == FLASH_AMD016)) {
 				for (i = 0; i < info->sector_count; i++)
 					info->start[i] = base + (i * 0x00010000);
 			} else {
 				if (info->flash_id & FLASH_BTYPE) {
 					/* set sector offsets for bottom boot block type	*/
 					info->start[0] = base + 0x00000000;
 					info->start[1] = base + 0x00004000;
 					info->start[2] = base + 0x00006000;
 					info->start[3] = base + 0x00008000;
 					for (i = 4; i < info->sector_count; i++) {
 						info->start[i] = base + (i * 0x00010000) - 0x00030000;
 					}
 				} else {
 					/* set sector offsets for top boot block type		*/
 					i = info->sector_count - 1;
 					info->start[i--] = base + info->size - 0x00004000;
 					info->start[i--] = base + info->size - 0x00006000;
 					info->start[i--] = base + info->size - 0x00008000;
 					for (; i >= 0; i--) {
 						info->start[i] = base + i * 0x00010000;
 					}
 				}
 			}

 			/* 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 */
 #ifdef CONFIG_ADCIOP
 				addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
 				info->protect[i] = addr2[4] & 1;
 #else
 				addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
 				if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
 					info->protect[i] = 0;
 				else
 					info->protect[i] = addr2[2] & 1;
 #endif
 			}

 			/*
 			 * Prevent writes to uninitialized FLASH.
 			 */
 			if (info->flash_id != FLASH_UNKNOWN) {
 #if 0 /* test-only */
 #ifdef CONFIG_ADCIOP
 				addr2 = (volatile unsigned char *)info->start[0];
 				addr2[ADDR0] = 0xAA;
 				addr2[ADDR1] = 0x55;
 				addr2[ADDR0] = 0xF0;  /* reset bank */
 #else
 				addr2 = (FLASH_WORD_SIZE *)info->start[0];
 				*addr2 = (FLASH_WORD_SIZE)0x00F000F0;	/* reset bank */
 #endif
 #else /* test-only */
 				addr2 = (FLASH_WORD_SIZE *)info->start[0];
 				*addr2 = (FLASH_WORD_SIZE)0x00F000F0;	/* reset bank */
 #endif /* test-only */
 			}

 			return (info->size);
 		}

 	int wait_for_DQ7(flash_info_t *info, int sect)
 		{
 			ulong start, now, last;
 			volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[sect]);

 			start = get_timer (0);
 			last  = start;
 			while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
 				if ((now = get_timer(start)) > CFG_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	flash_erase (flash_info_t *info, int s_first, int s_last)
 		{
 			volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
 			volatile FLASH_WORD_SIZE *addr2;
 			int flag, prot, sect, l_sect;
 			int i;

 			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!\n",
 					prot);
 			} else {
 				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 = (FLASH_WORD_SIZE *)(info->start[sect]);
 					printf("Erasing sector %p\n", addr2);

 					if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 						addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 						addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 						addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
 						addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 						addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 						addr2[0] = (FLASH_WORD_SIZE)0x00500050;  /* block erase */
 						for (i=0; i<50; i++)
 							udelay(1000);  /* wait 1 ms */
 					} else {
 						addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 						addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 						addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
 						addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
 						addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 						addr2[0] = (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)!!
 					 */
 					wait_for_DQ7(info, sect);
 				}
 			}

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

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

 #if 0
 			/*
 			 * We wait for the last triggered sector
 			 */
 			if (l_sect < 0)
 				goto DONE;
 			wait_for_DQ7(info, l_sect);

 		DONE:
 #endif
 			/* reset to read mode */
 			addr = (FLASH_WORD_SIZE *)info->start[0];
 			addr[0] = (FLASH_WORD_SIZE)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, 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)
 		{
 			volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) (info->start[0]);
 			volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *) dest;
 			volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
 			ulong start;
 			int i;

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

 			for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
 				int flag;

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

 				addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 				addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 				addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;

 				dest2[i] = data2[i];

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

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

 					if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
 						return (1);
 					}
 				}
 			}

 			return (0);
 		}

 /*-----------------------------------------------------------------------
  */
	/*
	* (C) Copyright 2002
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* (C) Copyright 2002 Jun Gu <jung@artesyncp.com>
	* Add support for Am29F016D and dynamic switch setting.
	*
	* 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
	*/

	/*
	* Modified 4/5/2001
	* Wait for completion of each sector erase command issued
	* 4/5/2001
	* Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
	*/

	#include <common.h>
	#include <ppc4xx.h>
	#include <asm/processor.h>


	#undef DEBUG
	#ifdef DEBUG
	#define DEBUGF(x...) printf(x)
	#else
	#define DEBUGF(x...)
	#endif /* DEBUG */

	#define BOOT_SMALL_FLASH 32 /* 00100000 */
	#define FLASH_ONBD_N 2 /* 00000010 */
	#define FLASH_SRAM_SEL 1 /* 00000001 */

	#define BOOT_SMALL_FLASH_VAL 4
	#define FLASH_ONBD_N_VAL 2
	#define FLASH_SRAM_SEL_VAL 1


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

	static unsigned long flash_addr_table[8][CFG_MAX_FLASH_BANKS] = {
	{0xffc00000, 0xffe00000, 0xff880000}, /* 0:000: configuraton 3 */
	{0xffc00000, 0xffe00000, 0xff800000}, /* 1:001: configuraton 4 */
	{0xffc00000, 0xffe00000, 0x00000000}, /* 2:010: configuraton 7 */
	{0xffc00000, 0xffe00000, 0x00000000}, /* 3:011: configuraton 8 */
	{0xff800000, 0xffa00000, 0xfff80000}, /* 4:100: configuraton 1 */
	{0xff800000, 0xffa00000, 0xfff00000}, /* 5:101: configuraton 2 */
	{0xffc00000, 0xffe00000, 0x00000000}, /* 6:110: configuraton 5 */
	{0xffc00000, 0xffe00000, 0x00000000} /* 7:111: configuraton 6 */
	};

	/*-----------------------------------------------------------------------
	* 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);
	#if 0
	static void flash_get_offsets (ulong base, flash_info_t *info);
	#endif

	#ifdef CONFIG_ADCIOP
	#define ADDR0 0x0aa9
	#define ADDR1 0x0556
	#define FLASH_WORD_SIZE unsigned char
	#endif

	#ifdef CONFIG_CPCI405
	#define ADDR0 0x5555
	#define ADDR1 0x2aaa
	#define FLASH_WORD_SIZE unsigned short
	#endif

	#ifdef CONFIG_WALNUT405
	#define ADDR0 0x5555
	#define ADDR1 0x2aaa
	#define FLASH_WORD_SIZE unsigned char
	#endif

	#ifdef CONFIG_EBONY
	#define ADDR0 0x5555
	#define ADDR1 0x2aaa
	#define FLASH_WORD_SIZE unsigned char
	#endif

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

	unsigned long flash_init (void) {
	unsigned long total_b = 0;
	unsigned long size_b[CFG_MAX_FLASH_BANKS];
	unsigned char * fpga_base = (unsigned char *)CFG_FPGA_BASE;
	unsigned char switch_status;
	unsigned short index = 0;
	int i;


	/* read FPGA base register FPGA_REG0 */
	switch_status = *fpga_base;

	/* check the bitmap of switch status */
	if (switch_status & BOOT_SMALL_FLASH) {
	index += BOOT_SMALL_FLASH_VAL;
	}
	if (switch_status & FLASH_ONBD_N) {
	index += FLASH_ONBD_N_VAL;
	}
	if (switch_status & FLASH_SRAM_SEL) {
	index += FLASH_SRAM_SEL_VAL;
	}

	DEBUGF("\n");
	DEBUGF("FLASH: Index: %d\n", index);

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

	/* check whether the address is 0 */
	if (flash_addr_table[index][i] == 0) {
	continue;
	}

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



	/*-----------------------------------------------------------------------
	*/
	#if 0
	static void flash_get_offsets (ulong base, flash_info_t *info)
	{
	int i;

	/* set up sector start address table */
	if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) \|\|
	(info->flash_id == FLASH_AM040) \|\|
	(info->flash_id == FLASH_AMD016)) {
	for (i = 0; i < info->sector_count; i++)
	info->start[i] = base + (i * 0x00010000);
	} else {
	if (info->flash_id & FLASH_BTYPE) {
	/* set sector offsets for bottom boot block type */
	info->start[0] = base + 0x00000000;
	info->start[1] = base + 0x00004000;
	info->start[2] = base + 0x00006000;
	info->start[3] = base + 0x00008000;
	for (i = 4; i < info->sector_count; i++) {
	info->start[i] = base + (i * 0x00010000) - 0x00030000;
	}
	} else {
	/* set sector offsets for top boot block type */
	i = info->sector_count - 1;
	info->start[i--] = base + info->size - 0x00004000;
	info->start[i--] = base + info->size - 0x00006000;
	info->start[i--] = base + info->size - 0x00008000;
	for (; i >= 0; i--) {
	info->start[i] = base + i * 0x00010000;
	}
	}
	}
	}
	#endif /* 0 */

	/*-----------------------------------------------------------------------
	*/
	void flash_print_info (flash_info_t *info)
	{
	int i;
	int k;
	int size;
	int erased;
	volatile unsigned long *flash;

	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;
	case FLASH_MAN_SST: printf ("SST "); break;
	default: printf ("Unknown Vendor "); break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AMD016: printf ("AM29F016D (16 Mbit, uniform sector size)\n");
	break;
	case FLASH_AM040: printf ("AM29F040 (512 Kbit, uniform sector size)\n");
	break;
	case FLASH_AM400B: printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
	break;
	case FLASH_AM400T: printf ("AM29LV400T (4 Mbit, top boot sector)\n");
	break;
	case FLASH_AM800B: printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
	break;
	case FLASH_AM800T: printf ("AM29LV800T (8 Mbit, top boot sector)\n");
	break;
	case FLASH_AM160B: printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
	break;
	case FLASH_AM160T: printf ("AM29LV160T (16 Mbit, top boot sector)\n");
	break;
	case FLASH_AM320B: printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
	break;
	case FLASH_AM320T: printf ("AM29LV320T (32 Mbit, top boot sector)\n");
	break;
	case FLASH_SST800A: printf ("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
	break;
	case FLASH_SST160A: printf ("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
	break;
	default: printf ("Unknown Chip Type\n");
	break;
	}

	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) {
	/*
	* Check if whole sector is erased
	*/
	if (i != (info->sector_count-1))
	size = info->start[i+1] - info->start[i];
	else
	size = info->start[0] + info->size - info->start[i];
	erased = 1;
	flash = (volatile unsigned long *)info->start[i];
	size = size >> 2; /* divide by 4 for longword access */
	for (k=0; k<size; k++)
	{
	if (*flash++ != 0xffffffff)
	{
	erased = 0;
	break;
	}
	}

	if ((i % 5) == 0)
	printf ("\n ");
	printf (" %08lX%s%s",
	info->start[i],
	erased ? " E" : " ",
	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;
	FLASH_WORD_SIZE value;
	ulong base = (ulong)addr;
	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE )addr;

	DEBUGF("FLASH ADDR: %08x\n", (unsigned)addr );

	/* Write auto select command: read Manufacturer ID */
	udelay(10000);
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	udelay(1000);
	addr2[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	udelay(1000);
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x00900090;
	udelay(1000);

	#ifdef CONFIG_ADCIOP
	value = addr2[2];
	#else
	value = addr2[0];
	#endif

	DEBUGF("FLASH MANUFACT: %x\n", value);

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

	#ifdef CONFIG_ADCIOP
	value = addr2[0]; /* device ID */
	debug ("\ndev_code=%x\n", value);
	#else
	value = addr2[1]; /* device ID */
	#endif

	DEBUGF("\nFLASH DEVICEID: %x\n", value);

	switch (value) {
	case (FLASH_WORD_SIZE)AMD_ID_F016D:
	info->flash_id += FLASH_AMD016;
	info->sector_count = 32;
	info->size = 0x00200000;
	break; /* => 2 MB */
	case (FLASH_WORD_SIZE)AMD_ID_F040B:
	info->flash_id += FLASH_AM040;
	info->sector_count = 8;
	info->size = 0x0080000; /* => 512 ko */
	break;
	case (FLASH_WORD_SIZE)AMD_ID_LV400T:
	info->flash_id += FLASH_AM400T;
	info->sector_count = 11;
	info->size = 0x00080000;
	break; /* => 0.5 MB */

	case (FLASH_WORD_SIZE)AMD_ID_LV400B:
	info->flash_id += FLASH_AM400B;
	info->sector_count = 11;
	info->size = 0x00080000;
	break; /* => 0.5 MB */

	case (FLASH_WORD_SIZE)AMD_ID_LV800T:
	info->flash_id += FLASH_AM800T;
	info->sector_count = 19;
	info->size = 0x00100000;
	break; /* => 1 MB */

	case (FLASH_WORD_SIZE)AMD_ID_LV800B:
	info->flash_id += FLASH_AM800B;
	info->sector_count = 19;
	info->size = 0x00100000;
	break; /* => 1 MB */

	case (FLASH_WORD_SIZE)AMD_ID_LV160T:
	info->flash_id += FLASH_AM160T;
	info->sector_count = 35;
	info->size = 0x00200000;
	break; /* => 2 MB */

	case (FLASH_WORD_SIZE)AMD_ID_LV160B:
	info->flash_id += FLASH_AM160B;
	info->sector_count = 35;
	info->size = 0x00200000;
	break; /* => 2 MB */
	#if 0 /* enable when device IDs are available */
	case (FLASH_WORD_SIZE)AMD_ID_LV320T:
	info->flash_id += FLASH_AM320T;
	info->sector_count = 67;
	info->size = 0x00400000;
	break; /* => 4 MB */

	case (FLASH_WORD_SIZE)AMD_ID_LV320B:
	info->flash_id += FLASH_AM320B;
	info->sector_count = 67;
	info->size = 0x00400000;
	break; /* => 4 MB */
	#endif
	case (FLASH_WORD_SIZE)SST_ID_xF800A:
	info->flash_id += FLASH_SST800A;
	info->sector_count = 16;
	info->size = 0x00100000;
	break; /* => 1 MB */

	case (FLASH_WORD_SIZE)SST_ID_xF160A:
	info->flash_id += FLASH_SST160A;
	info->sector_count = 32;
	info->size = 0x00200000;
	break; /* => 2 MB */

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

	}

	/* set up sector start address table */
	if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) \|\|
	(info->flash_id == FLASH_AM040) \|\|
	(info->flash_id == FLASH_AMD016)) {
	for (i = 0; i < info->sector_count; i++)
	info->start[i] = base + (i * 0x00010000);
	} else {
	if (info->flash_id & FLASH_BTYPE) {
	/* set sector offsets for bottom boot block type */
	info->start[0] = base + 0x00000000;
	info->start[1] = base + 0x00004000;
	info->start[2] = base + 0x00006000;
	info->start[3] = base + 0x00008000;
	for (i = 4; i < info->sector_count; i++) {
	info->start[i] = base + (i * 0x00010000) - 0x00030000;
	}
	} else {
	/* set sector offsets for top boot block type */
	i = info->sector_count - 1;
	info->start[i--] = base + info->size - 0x00004000;
	info->start[i--] = base + info->size - 0x00006000;
	info->start[i--] = base + info->size - 0x00008000;
	for (; i >= 0; i--) {
	info->start[i] = base + i * 0x00010000;
	}
	}
	}

	/* 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 */
	#ifdef CONFIG_ADCIOP
	addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
	info->protect[i] = addr2[4] & 1;
	#else
	addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
	info->protect[i] = 0;
	else
	info->protect[i] = addr2[2] & 1;
	#endif
	}

	/*
	* Prevent writes to uninitialized FLASH.
	*/
	if (info->flash_id != FLASH_UNKNOWN) {
	#if 0 /* test-only */
	#ifdef CONFIG_ADCIOP
	addr2 = (volatile unsigned char *)info->start[0];
	addr2[ADDR0] = 0xAA;
	addr2[ADDR1] = 0x55;
	addr2[ADDR0] = 0xF0; /* reset bank */
	#else
	addr2 = (FLASH_WORD_SIZE *)info->start[0];
	addr2 = (FLASH_WORD_SIZE)0x00F000F0; / reset bank */
	#endif
	#else /* test-only */
	addr2 = (FLASH_WORD_SIZE *)info->start[0];
	addr2 = (FLASH_WORD_SIZE)0x00F000F0; / reset bank */
	#endif /* test-only */
	}

	return (info->size);
	}

	int wait_for_DQ7(flash_info_t *info, int sect)
	{
	ulong start, now, last;
	volatile FLASH_WORD_SIZE addr = (FLASH_WORD_SIZE )(info->start[sect]);

	start = get_timer (0);
	last = start;
	while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
	if ((now = get_timer(start)) > CFG_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 flash_erase (flash_info_t *info, int s_first, int s_last)
	{
	volatile FLASH_WORD_SIZE addr = (FLASH_WORD_SIZE )(info->start[0]);
	volatile FLASH_WORD_SIZE *addr2;
	int flag, prot, sect, l_sect;
	int i;

	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!\n",
	prot);
	} else {
	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 = (FLASH_WORD_SIZE *)(info->start[sect]);
	printf("Erasing sector %p\n", addr2);

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	addr2[0] = (FLASH_WORD_SIZE)0x00500050; /* block erase */
	for (i=0; i<50; i++)
	udelay(1000); /* wait 1 ms */
	} else {
	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	addr[ADDR0] = (FLASH_WORD_SIZE)0x00800080;
	addr[ADDR0] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
	addr2[0] = (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)!!
	*/
	wait_for_DQ7(info, sect);
	}
	}

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

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

	#if 0
	/*
	* We wait for the last triggered sector
	*/
	if (l_sect < 0)
	goto DONE;
	wait_for_DQ7(info, l_sect);

	DONE:
	#endif
	/* reset to read mode */
	addr = (FLASH_WORD_SIZE *)info->start[0];
	addr[0] = (FLASH_WORD_SIZE)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, 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)
	{
	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE ) (info->start[0]);
	volatile FLASH_WORD_SIZE dest2 = (FLASH_WORD_SIZE ) dest;
	volatile FLASH_WORD_SIZE data2 = (FLASH_WORD_SIZE ) & data;
	ulong start;
	int i;

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

	for (i = 0; i < 4 / sizeof (FLASH_WORD_SIZE); i++) {
	int flag;

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

	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;

	dest2[i] = data2[i];

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

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

	if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
	return (1);
	}
	}
	}

	return (0);
	}

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