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

 /*
  * (C) Copyright 2000
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <mpc824x.h>
 #include <asm/processor.h>
 #include <asm/pci_io.h>
 #include <w83c553f.h>

 #define ROM_CS0_START	0xFF800000
 #define ROM_CS1_START	0xFF000000

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

 #if defined(CONFIG_ENV_IS_IN_FLASH)
 # ifndef  CONFIG_ENV_ADDR
 #  define CONFIG_ENV_ADDR  (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
 # endif
 # ifndef  CONFIG_ENV_SIZE
 #  define CONFIG_ENV_SIZE  CONFIG_ENV_SECT_SIZE
 # endif
 # ifndef  CONFIG_ENV_SECT_SIZE
 #  define CONFIG_ENV_SECT_SIZE  CONFIG_ENV_SIZE
 # endif
 #endif

 /*-----------------------------------------------------------------------
  * Functions
  */
 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 /* 0 */

 /*flash command address offsets*/

 #if 0
 #define ADDR0           (0x555)
 #define ADDR1           (0x2AA)
 #define ADDR3           (0x001)
 #else
 #define ADDR0		(0xAAA)
 #define ADDR1		(0x555)
 #define ADDR3		(0x001)
 #endif

 #define FLASH_WORD_SIZE unsigned char

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

 #if 0
 static int byte_parity_odd(unsigned char x) __attribute__ ((const));
 #endif /* 0 */
 static unsigned long flash_id(unsigned char mfct, unsigned char chip) __attribute__ ((const));

 typedef struct
 {
   FLASH_WORD_SIZE extval;
   unsigned short intval;
 } map_entry;

 #if 0
 static int
 byte_parity_odd(unsigned char x)
 {
   x ^= x >> 4;
   x ^= x >> 2;
   x ^= x >> 1;
   return (x & 0x1) != 0;
 }
 #endif /* 0 */


 static unsigned long
 flash_id(unsigned char mfct, unsigned char chip)
 {
   static const map_entry mfct_map[] =
     {
       {(FLASH_WORD_SIZE) AMD_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
       {(FLASH_WORD_SIZE) FUJ_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
       {(FLASH_WORD_SIZE) STM_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
       {(FLASH_WORD_SIZE) MT_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
       {(FLASH_WORD_SIZE) INTEL_MANUFACT,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
       {(FLASH_WORD_SIZE) INTEL_ALT_MANU,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
     };

   static const map_entry chip_map[] =
   {
     {AMD_ID_F040B,	FLASH_AM040},
     {(FLASH_WORD_SIZE) STM_ID_x800AB,	FLASH_STM800AB}
   };

   const map_entry *p;
   unsigned long result = FLASH_UNKNOWN;

   /* find chip id */
   for(p = &chip_map[0]; p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++)
     if(p->extval == chip)
     {
       result = FLASH_VENDMASK | p->intval;
       break;
     }

   /* find vendor id */
   for(p = &mfct_map[0]; p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++)
     if(p->extval == mfct)
     {
       result &= ~FLASH_VENDMASK;
       result |= (unsigned long) p->intval << 16;
       break;
     }

   return result;
 }


 unsigned long
 flash_init(void)
 {
   unsigned long i;
   unsigned char j;
   static const ulong flash_banks[] = CONFIG_SYS_FLASH_BANKS;

   /* Init: no FLASHes known */
   for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++)
   {
     flash_info_t * const pflinfo = &flash_info[i];
     pflinfo->flash_id = FLASH_UNKNOWN;
     pflinfo->size = 0;
     pflinfo->sector_count = 0;
   }

   /* Enable writes to Sandpoint flash */
   {
     register unsigned char temp;
     CONFIG_READ_BYTE(CONFIG_SYS_WINBOND_ISA_CFG_ADDR + WINBOND_CSCR, temp);
     temp &= ~0x20; /* clear BIOSWP bit */
     CONFIG_WRITE_BYTE(CONFIG_SYS_WINBOND_ISA_CFG_ADDR + WINBOND_CSCR, temp);
   }

   for(i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++)
   {
     flash_info_t * const pflinfo = &flash_info[i];
     const unsigned long base_address = flash_banks[i];
     volatile FLASH_WORD_SIZE * const flash = (FLASH_WORD_SIZE *) base_address;
 #if 0
     volatile FLASH_WORD_SIZE * addr2;
 #endif
 #if 0
     /* write autoselect sequence */
     flash[0x5555] = 0xaa;
     flash[0x2aaa] = 0x55;
     flash[0x5555] = 0x90;
 #else
     flash[0xAAA << (3 * i)] = 0xaa;
     flash[0x555 << (3 * i)] = 0x55;
     flash[0xAAA << (3 * i)] = 0x90;
 #endif
     __asm__ __volatile__("sync");

 #if 0
     pflinfo->flash_id = flash_id(flash[0x0], flash[0x1]);
 #else
     pflinfo->flash_id = flash_id(flash[0x0], flash[0x2 + 14 * i]);
 #endif

     switch(pflinfo->flash_id & FLASH_TYPEMASK)
     {
       case FLASH_AM040:
 	pflinfo->size = 0x00080000;
 	pflinfo->sector_count = 8;
 	for(j = 0; j < 8; j++)
 	{
 	  pflinfo->start[j] = base_address + 0x00010000 * j;
 	  pflinfo->protect[j] = flash[(j << 16) | 0x2];
 	}
 	break;
       case FLASH_STM800AB:
 	pflinfo->size = 0x00100000;
 	pflinfo->sector_count = 19;
 	pflinfo->start[0] = base_address;
 	pflinfo->start[1] = base_address + 0x4000;
 	pflinfo->start[2] = base_address + 0x6000;
 	pflinfo->start[3] = base_address + 0x8000;
 	for(j = 1; j < 16; j++)
 	{
 	  pflinfo->start[j+3] = base_address + 0x00010000 * j;
 	}
 #if 0
 	/* check for protected sectors */
 	for (j = 0; j < pflinfo->sector_count; j++) {
 	  /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 	  /* D0 = 1 if protected */
 	  addr2 = (volatile FLASH_WORD_SIZE *)(pflinfo->start[j]);
 	    if (pflinfo->flash_id & FLASH_MAN_SST)
 	      pflinfo->protect[j] = 0;
 	    else
 	      pflinfo->protect[j] = addr2[2] & 1;
 	}
 #endif
 	break;
     }
     /* Protect monitor and environment sectors
      */
 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_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)
     flash_protect(FLAG_PROTECT_SET,
 		CONFIG_ENV_ADDR,
 		CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
 		&flash_info[0]);
 #endif

     /* reset device to read mode */
     flash[0x0000] = 0xf0;
     __asm__ __volatile__("sync");
   }

     return flash_info[0].size + flash_info[1].size;
 }

 #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_MAN_SST)
 	  {
 	    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)
 {
   static const char unk[] = "Unknown";
   const char *mfct = unk, *type = unk;
   unsigned int i;

   if(info->flash_id != FLASH_UNKNOWN)
   {
     switch(info->flash_id & FLASH_VENDMASK)
     {
       case FLASH_MAN_AMD:	mfct = "AMD";				break;
       case FLASH_MAN_FUJ:	mfct = "FUJITSU";			break;
       case FLASH_MAN_STM:	mfct = "STM";				break;
       case FLASH_MAN_SST:	mfct = "SST";				break;
       case FLASH_MAN_BM:	mfct = "Bright Microelectonics";	break;
       case FLASH_MAN_INTEL:	mfct = "Intel";				break;
     }

     switch(info->flash_id & FLASH_TYPEMASK)
     {
       case FLASH_AM040:		type = "AM29F040B (512K * 8, uniform sector size)";	break;
       case FLASH_AM400B:	type = "AM29LV400B (4 Mbit, bottom boot sect)";		break;
       case FLASH_AM400T:	type = "AM29LV400T (4 Mbit, top boot sector)";		break;
       case FLASH_AM800B:	type = "AM29LV800B (8 Mbit, bottom boot sect)";		break;
       case FLASH_AM800T:	type = "AM29LV800T (8 Mbit, top boot sector)";		break;
       case FLASH_AM160T:	type = "AM29LV160T (16 Mbit, top boot sector)";		break;
       case FLASH_AM320B:	type = "AM29LV320B (32 Mbit, bottom boot sect)";	break;
       case FLASH_AM320T:	type = "AM29LV320T (32 Mbit, top boot sector)";		break;
       case FLASH_STM800AB:	type = "M29W800AB (8 Mbit, bottom boot sect)";		break;
       case FLASH_SST800A:	type = "SST39LF/VF800 (8 Mbit, uniform sector size)";	break;
       case FLASH_SST160A:	type = "SST39LF/VF160 (16 Mbit, uniform sector size)";	break;
     }
   }

   printf(
     "\n  Brand: %s Type: %s\n"
     "  Size: %lu KB in %d Sectors\n",
     mfct,
     type,
     info->size >> 10,
     info->sector_count
   );

   printf ("  Sector Start Addresses:");

   for (i = 0; i < info->sector_count; i++)
   {
     unsigned long size;
     unsigned int erased;
     unsigned long * flash = (unsigned long *) info->start[i];

     /*
      * Check if whole sector is erased
      */
     size =
       (i != (info->sector_count - 1)) ?
       (info->start[i + 1] - info->start[i]) >> 2 :
       (info->start[0] + info->size - info->start[i]) >> 2;

     for(
       flash = (unsigned long *) info->start[i], erased = 1;
       (flash != (unsigned long *) info->start[i] + size) && erased;
       flash++
     )
       erased = *flash == ~0x0UL;

     printf(
       "%s %08lX %s %s",
       (i % 5) ? "" : "\n   ",
       info->start[i],
       erased ? "E" : " ",
       info->protect[i] ? "RO" : "  "
     );
   }

   puts("\n");
   return;
 }

 #if 0

 /*
  * The following code cannot be run from FLASH!
  */
 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;

     printf("flash_get_size: \n");
     /* Write auto select command: read Manufacturer ID */
     eieio();
     addr2[ADDR0] = (FLASH_WORD_SIZE)0xAA;
     addr2[ADDR1] = (FLASH_WORD_SIZE)0x55;
     addr2[ADDR0] = (FLASH_WORD_SIZE)0x90;
     value = addr2[0];

     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  */
     }
     printf("recognised manufacturer");

     value = addr2[ADDR3];          /* device ID        */
 	debug ("\ndev_code=%x\n", value);

     switch (value) {
     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      */

     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      */

     case (FLASH_WORD_SIZE)AMD_ID_F040B:
 	info->flash_id += FLASH_AM040;
 	info->sector_count = 8;
 	info->size = 0x00080000;
 	break;              /* => 0.5 MB      */

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

     }

     printf("flash id %lx; sector count %x, size %lx\n", info->flash_id,info->sector_count,info->size);
     /* set up sector start address table */
 	if (info->flash_id & FLASH_MAN_SST)
 	  {
 	    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 */
 	addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
 		if (info->flash_id & FLASH_MAN_SST)
 		  info->protect[i] = 0;
 		else
 		  info->protect[i] = addr2[2] & 1;
     }

     /*
      * Prevent writes to uninitialized FLASH.
      */
     if (info->flash_id != FLASH_UNKNOWN) {
        addr2 = (FLASH_WORD_SIZE *)info->start[0];
 	*addr2 = (FLASH_WORD_SIZE)0x00F000F0;   /* reset bank */
     }

     return (info->size);
 }

 #endif


 int
 flash_erase(flash_info_t *info, int s_first, int s_last)
 {
     volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
     int flag, prot, sect, l_sect;
     ulong start, now, last;
     unsigned char sh8b;

     if ((s_first < 0) || (s_first > s_last)) {
 	if (info->flash_id == FLASH_UNKNOWN) {
 	    printf ("- missing\n");
 	} else {
 	    printf ("- no sectors to erase\n");
 	}
 	return 1;
     }

     if ((info->flash_id == FLASH_UNKNOWN) ||
 	(info->flash_id > (FLASH_MAN_STM | FLASH_AMD_COMP))) {
 	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;

     /* Check the ROM CS */
     if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START))
       sh8b = 3;
     else
       sh8b = 0;

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

     addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
     addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
     addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
     addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
     addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;

     /* Start erase on unprotected sectors */
     for (sect = s_first; sect<=s_last; sect++) {
 	if (info->protect[sect] == 0) { /* not protected */
 	    addr = (FLASH_WORD_SIZE *)(info->start[0] + (
 				(info->start[sect] - info->start[0]) << sh8b));
 			if (info->flash_id & FLASH_MAN_SST)
 			  {
 			    addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 			    addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
 			    addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
 			    addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 			    addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
 			    addr[0] = (FLASH_WORD_SIZE)0x00500050;  /* block erase */
 			    udelay(30000);  /* wait 30 ms */
 			  }
 			else
 			  addr[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
 	    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 = (FLASH_WORD_SIZE *)(info->start[0] + (
 			(info->start[l_sect] - info->start[0]) << sh8b));
     while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
 	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 = (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;
 	volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
     ulong start;
     int flag;
 	int i;
     unsigned char sh8b;

     /* Check the ROM CS */
     if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START))
       sh8b = 3;
     else
       sh8b = 0;

     dest2 = (FLASH_WORD_SIZE *)(((dest - info->start[0]) << sh8b) +
 				info->start[0]);

     /* Check if Flash is (sufficiently) erased */
     if ((*dest2 & (FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
 	return (2);
     }
     /* Disable interrupts which might cause a timeout here */
     flag = disable_interrupts();

 	for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
 	  {
 	    addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
 	    addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
 	    addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00A000A0;

 	    dest2[i << sh8b] = data2[i];

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

 	    /* data polling for D7 */
 	    start = get_timer (0);
 	    while ((dest2[i << sh8b] & (FLASH_WORD_SIZE)0x00800080) !=
 		   (data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
 	      if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 		return (1);
 	      }
 	    }
 	  }

     return (0);
 }

 /*-----------------------------------------------------------------------
  */
	/*
	* (C) Copyright 2000
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <mpc824x.h>
	#include <asm/processor.h>
	#include <asm/pci_io.h>
	#include <w83c553f.h>

	#define ROM_CS0_START 0xFF800000
	#define ROM_CS1_START 0xFF000000

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

	#if defined(CONFIG_ENV_IS_IN_FLASH)
	# ifndef CONFIG_ENV_ADDR
	# define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
	# endif
	# ifndef CONFIG_ENV_SIZE
	# define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
	# endif
	# ifndef CONFIG_ENV_SECT_SIZE
	# define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
	# endif
	#endif

	/*-----------------------------------------------------------------------
	* Functions
	*/
	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 /* 0 */

	/flash command address offsets/

	#if 0
	#define ADDR0 (0x555)
	#define ADDR1 (0x2AA)
	#define ADDR3 (0x001)
	#else
	#define ADDR0 (0xAAA)
	#define ADDR1 (0x555)
	#define ADDR3 (0x001)
	#endif

	#define FLASH_WORD_SIZE unsigned char

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

	#if 0
	static int byte_parity_odd(unsigned char x) __attribute__ ((const));
	#endif /* 0 */
	static unsigned long flash_id(unsigned char mfct, unsigned char chip) __attribute__ ((const));

	typedef struct
	{
	FLASH_WORD_SIZE extval;
	unsigned short intval;
	} map_entry;

	#if 0
	static int
	byte_parity_odd(unsigned char x)
	{
	x ^= x >> 4;
	x ^= x >> 2;
	x ^= x >> 1;
	return (x & 0x1) != 0;
	}
	#endif /* 0 */


	static unsigned long
	flash_id(unsigned char mfct, unsigned char chip)
	{
	static const map_entry mfct_map[] =
	{
	{(FLASH_WORD_SIZE) AMD_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
	{(FLASH_WORD_SIZE) FUJ_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
	{(FLASH_WORD_SIZE) STM_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
	{(FLASH_WORD_SIZE) MT_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
	{(FLASH_WORD_SIZE) INTEL_MANUFACT,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
	{(FLASH_WORD_SIZE) INTEL_ALT_MANU,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
	};

	static const map_entry chip_map[] =
	{
	{AMD_ID_F040B, FLASH_AM040},
	{(FLASH_WORD_SIZE) STM_ID_x800AB, FLASH_STM800AB}
	};

	const map_entry *p;
	unsigned long result = FLASH_UNKNOWN;

	/* find chip id */
	for(p = &chip_map[0]; p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++)
	if(p->extval == chip)
	{
	result = FLASH_VENDMASK \| p->intval;
	break;
	}

	/* find vendor id */
	for(p = &mfct_map[0]; p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++)
	if(p->extval == mfct)
	{
	result &= ~FLASH_VENDMASK;
	result \|= (unsigned long) p->intval << 16;
	break;
	}

	return result;
	}


	unsigned long
	flash_init(void)
	{
	unsigned long i;
	unsigned char j;
	static const ulong flash_banks[] = CONFIG_SYS_FLASH_BANKS;

	/* Init: no FLASHes known */
	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++)
	{
	flash_info_t * const pflinfo = &flash_info[i];
	pflinfo->flash_id = FLASH_UNKNOWN;
	pflinfo->size = 0;
	pflinfo->sector_count = 0;
	}

	/* Enable writes to Sandpoint flash */
	{
	register unsigned char temp;
	CONFIG_READ_BYTE(CONFIG_SYS_WINBOND_ISA_CFG_ADDR + WINBOND_CSCR, temp);
	temp &= ~0x20; /* clear BIOSWP bit */
	CONFIG_WRITE_BYTE(CONFIG_SYS_WINBOND_ISA_CFG_ADDR + WINBOND_CSCR, temp);
	}

	for(i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++)
	{
	flash_info_t * const pflinfo = &flash_info[i];
	const unsigned long base_address = flash_banks[i];
	volatile FLASH_WORD_SIZE * const flash = (FLASH_WORD_SIZE *) base_address;
	#if 0
	volatile FLASH_WORD_SIZE * addr2;
	#endif
	#if 0
	/* write autoselect sequence */
	flash[0x5555] = 0xaa;
	flash[0x2aaa] = 0x55;
	flash[0x5555] = 0x90;
	#else
	flash[0xAAA << (3 * i)] = 0xaa;
	flash[0x555 << (3 * i)] = 0x55;
	flash[0xAAA << (3 * i)] = 0x90;
	#endif
	__asm__ __volatile__("sync");

	#if 0
	pflinfo->flash_id = flash_id(flash[0x0], flash[0x1]);
	#else
	pflinfo->flash_id = flash_id(flash[0x0], flash[0x2 + 14 * i]);
	#endif

	switch(pflinfo->flash_id & FLASH_TYPEMASK)
	{
	case FLASH_AM040:
	pflinfo->size = 0x00080000;
	pflinfo->sector_count = 8;
	for(j = 0; j < 8; j++)
	{
	pflinfo->start[j] = base_address + 0x00010000 * j;
	pflinfo->protect[j] = flash[(j << 16) \| 0x2];
	}
	break;
	case FLASH_STM800AB:
	pflinfo->size = 0x00100000;
	pflinfo->sector_count = 19;
	pflinfo->start[0] = base_address;
	pflinfo->start[1] = base_address + 0x4000;
	pflinfo->start[2] = base_address + 0x6000;
	pflinfo->start[3] = base_address + 0x8000;
	for(j = 1; j < 16; j++)
	{
	pflinfo->start[j+3] = base_address + 0x00010000 * j;
	}
	#if 0
	/* check for protected sectors */
	for (j = 0; j < pflinfo->sector_count; j++) {
	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
	/* D0 = 1 if protected */
	addr2 = (volatile FLASH_WORD_SIZE *)(pflinfo->start[j]);
	if (pflinfo->flash_id & FLASH_MAN_SST)
	pflinfo->protect[j] = 0;
	else
	pflinfo->protect[j] = addr2[2] & 1;
	}
	#endif
	break;
	}
	/* Protect monitor and environment sectors
	*/
	#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_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)
	flash_protect(FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
	&flash_info[0]);
	#endif

	/* reset device to read mode */
	flash[0x0000] = 0xf0;
	__asm__ __volatile__("sync");
	}

	return flash_info[0].size + flash_info[1].size;
	}

	#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_MAN_SST)
	{
	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)
	{
	static const char unk[] = "Unknown";
	const char mfct = unk, type = unk;
	unsigned int i;

	if(info->flash_id != FLASH_UNKNOWN)
	{
	switch(info->flash_id & FLASH_VENDMASK)
	{
	case FLASH_MAN_AMD: mfct = "AMD"; break;
	case FLASH_MAN_FUJ: mfct = "FUJITSU"; break;
	case FLASH_MAN_STM: mfct = "STM"; break;
	case FLASH_MAN_SST: mfct = "SST"; break;
	case FLASH_MAN_BM: mfct = "Bright Microelectonics"; break;
	case FLASH_MAN_INTEL: mfct = "Intel"; break;
	}

	switch(info->flash_id & FLASH_TYPEMASK)
	{
	case FLASH_AM040: type = "AM29F040B (512K * 8, uniform sector size)"; break;
	case FLASH_AM400B: type = "AM29LV400B (4 Mbit, bottom boot sect)"; break;
	case FLASH_AM400T: type = "AM29LV400T (4 Mbit, top boot sector)"; break;
	case FLASH_AM800B: type = "AM29LV800B (8 Mbit, bottom boot sect)"; break;
	case FLASH_AM800T: type = "AM29LV800T (8 Mbit, top boot sector)"; break;
	case FLASH_AM160T: type = "AM29LV160T (16 Mbit, top boot sector)"; break;
	case FLASH_AM320B: type = "AM29LV320B (32 Mbit, bottom boot sect)"; break;
	case FLASH_AM320T: type = "AM29LV320T (32 Mbit, top boot sector)"; break;
	case FLASH_STM800AB: type = "M29W800AB (8 Mbit, bottom boot sect)"; break;
	case FLASH_SST800A: type = "SST39LF/VF800 (8 Mbit, uniform sector size)"; break;
	case FLASH_SST160A: type = "SST39LF/VF160 (16 Mbit, uniform sector size)"; break;
	}
	}

	printf(
	"\n Brand: %s Type: %s\n"
	" Size: %lu KB in %d Sectors\n",
	mfct,
	type,
	info->size >> 10,
	info->sector_count
	);

	printf (" Sector Start Addresses:");

	for (i = 0; i < info->sector_count; i++)
	{
	unsigned long size;
	unsigned int erased;
	unsigned long * flash = (unsigned long *) info->start[i];

	/*
	* Check if whole sector is erased
	*/
	size =
	(i != (info->sector_count - 1)) ?
	(info->start[i + 1] - info->start[i]) >> 2 :
	(info->start[0] + info->size - info->start[i]) >> 2;

	for(
	flash = (unsigned long *) info->start[i], erased = 1;
	(flash != (unsigned long *) info->start[i] + size) && erased;
	flash++
	)
	erased = *flash == ~0x0UL;

	printf(
	"%s %08lX %s %s",
	(i % 5) ? "" : "\n ",
	info->start[i],
	erased ? "E" : " ",
	info->protect[i] ? "RO" : " "
	);
	}

	puts("\n");
	return;
	}

	#if 0

	/*
	* The following code cannot be run from FLASH!
	*/
	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;

	printf("flash_get_size: \n");
	/* Write auto select command: read Manufacturer ID */
	eieio();
	addr2[ADDR0] = (FLASH_WORD_SIZE)0xAA;
	addr2[ADDR1] = (FLASH_WORD_SIZE)0x55;
	addr2[ADDR0] = (FLASH_WORD_SIZE)0x90;
	value = addr2[0];

	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 */
	}
	printf("recognised manufacturer");

	value = addr2[ADDR3]; /* device ID */
	debug ("\ndev_code=%x\n", value);

	switch (value) {
	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 */

	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 */

	case (FLASH_WORD_SIZE)AMD_ID_F040B:
	info->flash_id += FLASH_AM040;
	info->sector_count = 8;
	info->size = 0x00080000;
	break; /* => 0.5 MB */

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

	}

	printf("flash id %lx; sector count %x, size %lx\n", info->flash_id,info->sector_count,info->size);
	/* set up sector start address table */
	if (info->flash_id & FLASH_MAN_SST)
	{
	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 */
	addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
	if (info->flash_id & FLASH_MAN_SST)
	info->protect[i] = 0;
	else
	info->protect[i] = addr2[2] & 1;
	}

	/*
	* Prevent writes to uninitialized FLASH.
	*/
	if (info->flash_id != FLASH_UNKNOWN) {
	addr2 = (FLASH_WORD_SIZE *)info->start[0];
	addr2 = (FLASH_WORD_SIZE)0x00F000F0; / reset bank */
	}

	return (info->size);
	}

	#endif


	int
	flash_erase(flash_info_t *info, int s_first, int s_last)
	{
	volatile FLASH_WORD_SIZE addr = (FLASH_WORD_SIZE )(info->start[0]);
	int flag, prot, sect, l_sect;
	ulong start, now, last;
	unsigned char sh8b;

	if ((s_first < 0) \|\| (s_first > s_last)) {
	if (info->flash_id == FLASH_UNKNOWN) {
	printf ("- missing\n");
	} else {
	printf ("- no sectors to erase\n");
	}
	return 1;
	}

	if ((info->flash_id == FLASH_UNKNOWN) \|\|
	(info->flash_id > (FLASH_MAN_STM \| FLASH_AMD_COMP))) {
	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;

	/* Check the ROM CS */
	if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START))
	sh8b = 3;
	else
	sh8b = 0;

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

	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect<=s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	addr = (FLASH_WORD_SIZE *)(info->start[0] + (
	(info->start[sect] - info->start[0]) << sh8b));
	if (info->flash_id & FLASH_MAN_SST)
	{
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
	addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
	addr[0] = (FLASH_WORD_SIZE)0x00500050; /* block erase */
	udelay(30000); /* wait 30 ms */
	}
	else
	addr[0] = (FLASH_WORD_SIZE)0x00300030; /* sector erase */
	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 = (FLASH_WORD_SIZE *)(info->start[0] + (
	(info->start[l_sect] - info->start[0]) << sh8b));
	while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
	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 = (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;
	volatile FLASH_WORD_SIZE data2 = (FLASH_WORD_SIZE )&data;
	ulong start;
	int flag;
	int i;
	unsigned char sh8b;

	/* Check the ROM CS */
	if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START))
	sh8b = 3;
	else
	sh8b = 0;

	dest2 = (FLASH_WORD_SIZE *)(((dest - info->start[0]) << sh8b) +
	info->start[0]);

	/* Check if Flash is (sufficiently) erased */
	if ((*dest2 & (FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
	return (2);
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
	{
	addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
	addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
	addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00A000A0;

	dest2[i << sh8b] = data2[i];

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

	/* data polling for D7 */
	start = get_timer (0);
	while ((dest2[i << sh8b] & (FLASH_WORD_SIZE)0x00800080) !=
	(data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
	return (1);
	}
	}
	}

	return (0);
	}

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