board/tqm8xx/flash.c

   1 /*
   2  * (C) Copyright 2000-2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /* #define DEBUG */
  25
  26 #include <common.h>
  27 #include <mpc8xx.h>
  28 #include <environment.h>
  29
  30 #ifndef CFG_ENV_ADDR
  31 #define CFG_ENV_ADDR    (CFG_FLASH_BASE + CFG_ENV_OFFSET)
  32 #endif
  33
  34 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
  35
  36 /*-----------------------------------------------------------------------
  37  * Functions
  38  */
  39 static ulong flash_get_size (vu_long *addr, flash_info_t *info);
  40 static int write_word (flash_info_t *info, ulong dest, ulong data);
  41
  42 /*-----------------------------------------------------------------------
  43  */
  44
  45 unsigned long flash_init (void)
  46 {
  47         volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
  48         volatile memctl8xx_t *memctl = &immap->im_memctl;
  49         unsigned long size_b0, size_b1;
  50         int i;
  51
  52         /* Init: no FLASHes known */
  53         for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
  54                 flash_info[i].flash_id = FLASH_UNKNOWN;
  55         }
  56
  57         /* Static FLASH Bank configuration here - FIXME XXX */
  58
  59         debug ("\n## Get flash bank 1 size @ 0x%08x\n",FLASH_BASE0_PRELIM);
  60
  61         size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
  62
  63         debug ("## Get flash bank 2 size @ 0x%08x\n",FLASH_BASE1_PRELIM);
  64
  65         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  66                 printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
  67                         size_b0, size_b0<<20);
  68         }
  69
  70         size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
  71
  72         debug ("## Prelim. Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);
  73
  74         if (size_b1 > size_b0) {
  75                 printf ("## ERROR: "
  76                         "Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
  77                         size_b1, size_b1<<20,
  78                         size_b0, size_b0<<20
  79                 );
  80                 flash_info[0].flash_id  = FLASH_UNKNOWN;
  81                 flash_info[1].flash_id  = FLASH_UNKNOWN;
  82                 flash_info[0].sector_count      = -1;
  83                 flash_info[1].sector_count      = -1;
  84                 flash_info[0].size              = 0;
  85                 flash_info[1].size              = 0;
  86                 return (0);
  87         }
  88
  89         debug  ("## Before remap: "
  90                 "BR0: 0x%08x    OR0: 0x%08x    "
  91                 "BR1: 0x%08x    OR1: 0x%08x\n",
  92                 memctl->memc_br0, memctl->memc_or0,
  93                 memctl->memc_br1, memctl->memc_or1);
  94
  95         /* Remap FLASH according to real size */
  96         memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size_b0 & OR_AM_MSK);
  97         memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V;
  98
  99         debug ("## BR0: 0x%08x    OR0: 0x%08x\n",
 100                 memctl->memc_br0, memctl->memc_or0);
 101
 102         /* Re-do sizing to get full correct info */
 103         size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
 104
 105 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
 106         /* monitor protection ON by default */
 107         debug ("Protect monitor: %08lx ... %08lx\n",
 108                 (ulong)CFG_MONITOR_BASE,
 109                 (ulong)CFG_MONITOR_BASE + monitor_flash_len - 1);
 110
 111         flash_protect(FLAG_PROTECT_SET,
 112                       CFG_MONITOR_BASE,
 113                       CFG_MONITOR_BASE + monitor_flash_len - 1,
 114                       &flash_info[0]);
 115 #endif
 116
 117 #ifdef  CFG_ENV_IS_IN_FLASH
 118         /* ENV protection ON by default */
 119 # ifdef CFG_ENV_ADDR_REDUND
 120         debug ("Protect primary   environment: %08lx ... %08lx\n",
 121                 (ulong)CFG_ENV_ADDR,
 122                 (ulong)CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1);
 123 # else
 124         debug ("Protect environment: %08lx ... %08lx\n",
 125                 (ulong)CFG_ENV_ADDR,
 126                 (ulong)CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1);
 127 # endif
 128
 129         flash_protect(FLAG_PROTECT_SET,
 130                       CFG_ENV_ADDR,
 131                       CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1,
 132                       &flash_info[0]);
 133 #endif
 134
 135 #ifdef CFG_ENV_ADDR_REDUND
 136         debug ("Protect redundand environment: %08lx ... %08lx\n",
 137                 (ulong)CFG_ENV_ADDR_REDUND,
 138                 (ulong)CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1);
 139
 140         flash_protect(FLAG_PROTECT_SET,
 141                       CFG_ENV_ADDR_REDUND,
 142                       CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1,
 143                       &flash_info[0]);
 144 #endif
 145
 146         if (size_b1) {
 147                 memctl->memc_or1 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
 148                 memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
 149                                     BR_MS_GPCM | BR_V;
 150
 151                 debug ("## BR1: 0x%08x    OR1: 0x%08x\n",
 152                         memctl->memc_br1, memctl->memc_or1);
 153
 154                 /* Re-do sizing to get full correct info */
 155                 size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
 156                                           &flash_info[1]);
 157
 158 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
 159                 /* monitor protection ON by default */
 160                 flash_protect(FLAG_PROTECT_SET,
 161                               CFG_MONITOR_BASE,
 162                               CFG_MONITOR_BASE+monitor_flash_len-1,
 163                               &flash_info[1]);
 164 #endif
 165
 166 #ifdef  CFG_ENV_IS_IN_FLASH
 167                 /* ENV protection ON by default */
 168                 flash_protect(FLAG_PROTECT_SET,
 169                               CFG_ENV_ADDR,
 170                               CFG_ENV_ADDR+CFG_ENV_SIZE-1,
 171                               &flash_info[1]);
 172 #endif
 173         } else {
 174                 memctl->memc_br1 = 0;           /* invalidate bank */
 175
 176                 flash_info[1].flash_id = FLASH_UNKNOWN;
 177                 flash_info[1].sector_count = -1;
 178                 flash_info[1].size = 0;
 179
 180                 debug ("## DISABLE BR1: 0x%08x    OR1: 0x%08x\n",
 181                         memctl->memc_br1, memctl->memc_or1);
 182         }
 183
 184         debug ("## Final Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);
 185
 186         flash_info[0].size = size_b0;
 187         flash_info[1].size = size_b1;
 188
 189         return (size_b0 + size_b1);
 190 }
 191
 192 /*-----------------------------------------------------------------------
 193  */
 194 void flash_print_info  (flash_info_t *info)
 195 {
 196         int i;
 197
 198         if (info->flash_id == FLASH_UNKNOWN) {
 199                 printf ("missing or unknown FLASH type\n");
 200                 return;
 201         }
 202
 203         switch (info->flash_id & FLASH_VENDMASK) {
 204         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 205         case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 206         default:                printf ("Unknown Vendor ");     break;
 207         }
 208
 209         switch (info->flash_id & FLASH_TYPEMASK) {
 210 #ifdef CONFIG_TQM8xxM   /* mirror bit flash */
 211         case FLASH_AMLV128U:    printf ("AM29LV128ML (128Mbit, uniform sector size)\n");
 212                                 break;
 213         case FLASH_AMLV320U:    printf ("AM29LV320ML (32Mbit, uniform sector size)\n");
 214                                 break;
 215         case FLASH_AMLV640U:    printf ("AM29LV640ML (64Mbit, uniform sector size)\n");
 216                                 break;
 217 # else  /* ! TQM8xxM */
 218         case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 219                                 break;
 220         case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 221                                 break;
 222         case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 223                                 break;
 224         case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 225                                 break;
 226         case FLASH_AM320B:      printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 227                                 break;
 228         case FLASH_AM320T:      printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 229                                 break;
 230 #endif  /* TQM8xxM */
 231         case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 232                                 break;
 233         case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 234                                 break;
 235         default:                printf ("Unknown Chip Type\n");
 236                                 break;
 237         }
 238
 239         printf ("  Size: %ld MB in %d Sectors\n",
 240                 info->size >> 20, info->sector_count);
 241
 242         printf ("  Sector Start Addresses:");
 243         for (i=0; i<info->sector_count; ++i) {
 244                 if ((i % 5) == 0)
 245                         printf ("\n   ");
 246                 printf (" %08lX%s",
 247                         info->start[i],
 248                         info->protect[i] ? " (RO)" : "     "
 249                 );
 250         }
 251         printf ("\n");
 252         return;
 253 }
 254
 255 /*-----------------------------------------------------------------------
 256  */
 257
 258
 259 /*-----------------------------------------------------------------------
 260  */
 261
 262 /*
 263  * The following code cannot be run from FLASH!
 264  */
 265
 266 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 267 {
 268         short i;
 269         ulong value;
 270         ulong base = (ulong)addr;
 271
 272         /* Write auto select command: read Manufacturer ID */
 273         addr[0x0555] = 0x00AA00AA;
 274         addr[0x02AA] = 0x00550055;
 275         addr[0x0555] = 0x00900090;
 276
 277         value = addr[0];
 278
 279         debug ("Manuf. ID @ 0x%08lx: 0x%08lx\n", (ulong)addr, value);
 280
 281         switch (value) {
 282         case AMD_MANUFACT:
 283                 info->flash_id = FLASH_MAN_AMD;
 284                 break;
 285         case FUJ_MANUFACT:
 286                 info->flash_id = FLASH_MAN_FUJ;
 287                 break;
 288         default:
 289                 info->flash_id = FLASH_UNKNOWN;
 290                 info->sector_count = 0;
 291                 info->size = 0;
 292                 return (0);                     /* no or unknown flash  */
 293         }
 294
 295         value = addr[1];                        /* device ID            */
 296
 297         debug ("Device ID @ 0x%08lx: 0x%08lx\n", (ulong)(&addr[1]), value);
 298
 299         switch (value) {
 300 #ifdef CONFIG_TQM8xxM   /* mirror bit flash */
 301         case AMD_ID_MIRROR:
 302                 /* Special case for AMLV320MH/L */
 303                 if ((addr[14] & 0x00ff00ff) == 0x001d001d &&
 304                         (addr[15] & 0x00ff00ff) == 0x00000000) {
 305                         info->flash_id += FLASH_AMLV320U;
 306                         info->sector_count = 64;
 307                         info->size = 0x00800000; /* => 8 MB */
 308                         break;
 309                 }
 310                 switch(addr[14]) {
 311                 case AMD_ID_LV128U_2:
 312                         if (addr[15] != AMD_ID_LV128U_3) {
 313                                 info->flash_id = FLASH_UNKNOWN;
 314                         }
 315                         else {
 316                                 info->flash_id += FLASH_AMLV128U;
 317                                 info->sector_count = 256;
 318                                 info->size = 0x02000000;
 319                         }
 320                         break;                          /* => 32 MB             */
 321                 case AMD_ID_LV640U_2:
 322                         if (addr[15] != AMD_ID_LV640U_3) {
 323                                 info->flash_id = FLASH_UNKNOWN;
 324                         }
 325                         else {
 326                                 info->flash_id += FLASH_AMLV640U;
 327                                 info->sector_count = 128;
 328                                 info->size = 0x01000000;
 329                         }
 330                         break;                          /* => 16 MB             */
 331                 default:
 332                         info->flash_id = FLASH_UNKNOWN;
 333                         break;
 334                 }
 335                 break;
 336 # else  /* ! TQM8xxM */
 337         case AMD_ID_LV400T:
 338                 info->flash_id += FLASH_AM400T;
 339                 info->sector_count = 11;
 340                 info->size = 0x00100000;
 341                 break;                          /* => 1 MB              */
 342
 343         case AMD_ID_LV400B:
 344                 info->flash_id += FLASH_AM400B;
 345                 info->sector_count = 11;
 346                 info->size = 0x00100000;
 347                 break;                          /* => 1 MB              */
 348
 349         case AMD_ID_LV800T:
 350                 info->flash_id += FLASH_AM800T;
 351                 info->sector_count = 19;
 352                 info->size = 0x00200000;
 353                 break;                          /* => 2 MB              */
 354
 355         case AMD_ID_LV800B:
 356                 info->flash_id += FLASH_AM800B;
 357                 info->sector_count = 19;
 358                 info->size = 0x00200000;
 359                 break;                          /* => 2 MB              */
 360
 361         case AMD_ID_LV320T:
 362                 info->flash_id += FLASH_AM320T;
 363                 info->sector_count = 71;
 364                 info->size = 0x00800000;
 365                 break;                          /* => 8 MB              */
 366
 367         case AMD_ID_LV320B:
 368                 info->flash_id += FLASH_AM320B;
 369                 info->sector_count = 71;
 370                 info->size = 0x00800000;
 371                 break;                          /* => 8 MB              */
 372 #endif  /* TQM8xxM */
 373
 374         case AMD_ID_LV160T:
 375                 info->flash_id += FLASH_AM160T;
 376                 info->sector_count = 35;
 377                 info->size = 0x00400000;
 378                 break;                          /* => 4 MB              */
 379
 380         case AMD_ID_LV160B:
 381                 info->flash_id += FLASH_AM160B;
 382                 info->sector_count = 35;
 383                 info->size = 0x00400000;
 384                 break;                          /* => 4 MB              */
 385
 386         default:
 387                 info->flash_id = FLASH_UNKNOWN;
 388                 return (0);                     /* => no or unknown flash */
 389         }
 390
 391         /* set up sector start address table */
 392         switch (value) {
 393 #ifdef CONFIG_TQM8xxM   /* mirror bit flash */
 394         case AMD_ID_MIRROR:
 395                 switch (info->flash_id & FLASH_TYPEMASK) {
 396                         /* only known types here - no default */
 397                 case FLASH_AMLV128U:
 398                 case FLASH_AMLV640U:
 399                 case FLASH_AMLV320U:
 400                         for (i = 0; i < info->sector_count; i++) {
 401                                 info->start[i] = base;
 402                                 base += 0x20000;
 403                         }
 404                         break;
 405                 }
 406                 break;
 407 # else  /* ! TQM8xxM */
 408         case AMD_ID_LV400B:
 409         case AMD_ID_LV800B:
 410                 /* set sector offsets for bottom boot block type        */
 411                 info->start[0] = base + 0x00000000;
 412                 info->start[1] = base + 0x00008000;
 413                 info->start[2] = base + 0x0000C000;
 414                 info->start[3] = base + 0x00010000;
 415                 for (i = 4; i < info->sector_count; i++) {
 416                         info->start[i] = base + (i * 0x00020000) - 0x00060000;
 417                 }
 418                 break;
 419         case AMD_ID_LV400T:
 420         case AMD_ID_LV800T:
 421                 /* set sector offsets for top boot block type           */
 422                 i = info->sector_count - 1;
 423                 info->start[i--] = base + info->size - 0x00008000;
 424                 info->start[i--] = base + info->size - 0x0000C000;
 425                 info->start[i--] = base + info->size - 0x00010000;
 426                 for (; i >= 0; i--) {
 427                         info->start[i] = base + i * 0x00020000;
 428                 }
 429                 break;
 430         case AMD_ID_LV320B:
 431                 for (i = 0; i < info->sector_count; i++) {
 432                         info->start[i] = base;
 433                         /*
 434                          * The first 8 sectors are 8 kB,
 435                          * all the other ones  are 64 kB
 436                          */
 437                         base += (i < 8)
 438                                 ?  2 * ( 8 << 10)
 439                                 :  2 * (64 << 10);
 440                 }
 441                 break;
 442         case AMD_ID_LV320T:
 443                 for (i = 0; i < info->sector_count; i++) {
 444                         info->start[i] = base;
 445                         /*
 446                          * The last 8 sectors are 8 kB,
 447                          * all the other ones  are 64 kB
 448                          */
 449                         base += (i < (info->sector_count - 8))
 450                                 ?  2 * (64 << 10)
 451                                 :  2 * ( 8 << 10);
 452                 }
 453                 break;
 454 #endif  /* TQM8xxM */
 455         case AMD_ID_LV160B:
 456                 /* set sector offsets for bottom boot block type        */
 457                 info->start[0] = base + 0x00000000;
 458                 info->start[1] = base + 0x00008000;
 459                 info->start[2] = base + 0x0000C000;
 460                 info->start[3] = base + 0x00010000;
 461                 for (i = 4; i < info->sector_count; i++) {
 462                         info->start[i] = base + (i * 0x00020000) - 0x00060000;
 463                 }
 464                 break;
 465         case AMD_ID_LV160T:
 466                 /* set sector offsets for top boot block type           */
 467                 i = info->sector_count - 1;
 468                 info->start[i--] = base + info->size - 0x00008000;
 469                 info->start[i--] = base + info->size - 0x0000C000;
 470                 info->start[i--] = base + info->size - 0x00010000;
 471                 for (; i >= 0; i--) {
 472                         info->start[i] = base + i * 0x00020000;
 473                 }
 474                 break;
 475         default:
 476                 return (0);
 477                 break;
 478         }
 479
 480         /* check for protected sectors */
 481         for (i = 0; i < info->sector_count; i++) {
 482                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 483                 /* D0 = 1 if protected */
 484                 addr = (volatile unsigned long *)(info->start[i]);
 485                 info->protect[i] = addr[2] & 1;
 486         }
 487
 488         /*
 489          * Prevent writes to uninitialized FLASH.
 490          */
 491         if (info->flash_id != FLASH_UNKNOWN) {
 492                 addr = (volatile unsigned long *)info->start[0];
 493
 494                 *addr = 0x00F000F0;     /* reset bank */
 495         }
 496
 497         return (info->size);
 498 }
 499
 500
 501 /*-----------------------------------------------------------------------
 502  */
 503
 504 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 505 {
 506         vu_long *addr = (vu_long*)(info->start[0]);
 507         int flag, prot, sect, l_sect;
 508         ulong start, now, last;
 509
 510         debug ("flash_erase: first: %d last: %d\n", s_first, s_last);
 511
 512         if ((s_first < 0) || (s_first > s_last)) {
 513                 if (info->flash_id == FLASH_UNKNOWN) {
 514                         printf ("- missing\n");
 515                 } else {
 516                         printf ("- no sectors to erase\n");
 517                 }
 518                 return 1;
 519         }
 520
 521         if ((info->flash_id == FLASH_UNKNOWN) ||
 522             (info->flash_id > FLASH_AMD_COMP)) {
 523                 printf ("Can't erase unknown flash type %08lx - aborted\n",
 524                         info->flash_id);
 525                 return 1;
 526         }
 527
 528         prot = 0;
 529         for (sect=s_first; sect<=s_last; ++sect) {
 530                 if (info->protect[sect]) {
 531                         prot++;
 532                 }
 533         }
 534
 535         if (prot) {
 536                 printf ("- Warning: %d protected sectors will not be erased!\n",
 537                         prot);
 538         } else {
 539                 printf ("\n");
 540         }
 541
 542         l_sect = -1;
 543
 544         /* Disable interrupts which might cause a timeout here */
 545         flag = disable_interrupts();
 546
 547         addr[0x0555] = 0x00AA00AA;
 548         addr[0x02AA] = 0x00550055;
 549         addr[0x0555] = 0x00800080;
 550         addr[0x0555] = 0x00AA00AA;
 551         addr[0x02AA] = 0x00550055;
 552
 553         /* Start erase on unprotected sectors */
 554         for (sect = s_first; sect<=s_last; sect++) {
 555                 if (info->protect[sect] == 0) { /* not protected */
 556                         addr = (vu_long*)(info->start[sect]);
 557                         addr[0] = 0x00300030;
 558                         l_sect = sect;
 559                 }
 560         }
 561
 562         /* re-enable interrupts if necessary */
 563         if (flag)
 564                 enable_interrupts();
 565
 566         /* wait at least 80us - let's wait 1 ms */
 567         udelay (1000);
 568
 569         /*
 570          * We wait for the last triggered sector
 571          */
 572         if (l_sect < 0)
 573                 goto DONE;
 574
 575         start = get_timer (0);
 576         last  = start;
 577         addr = (vu_long*)(info->start[l_sect]);
 578         while ((addr[0] & 0x00800080) != 0x00800080) {
 579                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 580                         printf ("Timeout\n");
 581                         return 1;
 582                 }
 583                 /* show that we're waiting */
 584                 if ((now - last) > 1000) {      /* every second */
 585                         putc ('.');
 586                         last = now;
 587                 }
 588         }
 589
 590 DONE:
 591         /* reset to read mode */
 592         addr = (volatile unsigned long *)info->start[0];
 593         addr[0] = 0x00F000F0;   /* reset bank */
 594
 595         printf (" done\n");
 596         return 0;
 597 }
 598
 599 /*-----------------------------------------------------------------------
 600  * Copy memory to flash, returns:
 601  * 0 - OK
 602  * 1 - write timeout
 603  * 2 - Flash not erased
 604  */
 605
 606 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 607 {
 608         ulong cp, wp, data;
 609         int i, l, rc;
 610
 611         wp = (addr & ~3);       /* get lower word aligned address */
 612
 613         /*
 614          * handle unaligned start bytes
 615          */
 616         if ((l = addr - wp) != 0) {
 617                 data = 0;
 618                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 619                         data = (data << 8) | (*(uchar *)cp);
 620                 }
 621                 for (; i<4 && cnt>0; ++i) {
 622                         data = (data << 8) | *src++;
 623                         --cnt;
 624                         ++cp;
 625                 }
 626                 for (; cnt==0 && i<4; ++i, ++cp) {
 627                         data = (data << 8) | (*(uchar *)cp);
 628                 }
 629
 630                 if ((rc = write_word(info, wp, data)) != 0) {
 631                         return (rc);
 632                 }
 633                 wp += 4;
 634         }
 635
 636         /*
 637          * handle word aligned part
 638          */
 639         while (cnt >= 4) {
 640                 data = 0;
 641                 for (i=0; i<4; ++i) {
 642                         data = (data << 8) | *src++;
 643                 }
 644                 if ((rc = write_word(info, wp, data)) != 0) {
 645                         return (rc);
 646                 }
 647                 wp  += 4;
 648                 cnt -= 4;
 649         }
 650
 651         if (cnt == 0) {
 652                 return (0);
 653         }
 654
 655         /*
 656          * handle unaligned tail bytes
 657          */
 658         data = 0;
 659         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 660                 data = (data << 8) | *src++;
 661                 --cnt;
 662         }
 663         for (; i<4; ++i, ++cp) {
 664                 data = (data << 8) | (*(uchar *)cp);
 665         }
 666
 667         return (write_word(info, wp, data));
 668 }
 669
 670 /*-----------------------------------------------------------------------
 671  * Write a word to Flash, returns:
 672  * 0 - OK
 673  * 1 - write timeout
 674  * 2 - Flash not erased
 675  */
 676 static int write_word (flash_info_t *info, ulong dest, ulong data)
 677 {
 678         vu_long *addr = (vu_long*)(info->start[0]);
 679         ulong start;
 680         int flag;
 681
 682         /* Check if Flash is (sufficiently) erased */
 683         if ((*((vu_long *)dest) & data) != data) {
 684                 return (2);
 685         }
 686         /* Disable interrupts which might cause a timeout here */
 687         flag = disable_interrupts();
 688
 689         addr[0x0555] = 0x00AA00AA;
 690         addr[0x02AA] = 0x00550055;
 691         addr[0x0555] = 0x00A000A0;
 692
 693         *((vu_long *)dest) = data;
 694
 695         /* re-enable interrupts if necessary */
 696         if (flag)
 697                 enable_interrupts();
 698
 699         /* data polling for D7 */
 700         start = get_timer (0);
 701         while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
 702                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 703                         return (1);
 704                 }
 705         }
 706         return (0);
 707 }
 708
 709 /*-----------------------------------------------------------------------
 710  */