git.sur5r.net Git - u-boot/blob - board/etx094/flash.c

   1 /*
   2  * (C) Copyright 2000
   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 #include <common.h>
  25 #include <mpc8xx.h>
  26
  27 flash_info_t    flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
  28
  29 /*-----------------------------------------------------------------------
  30  * Functions
  31  */
  32 static ulong flash_get_size(vu_long *addr, flash_info_t *info);
  33 static int write_word(flash_info_t *info, ulong dest, ulong data);
  34 static void flash_get_offsets(ulong base, flash_info_t *info);
  35
  36 /*-----------------------------------------------------------------------
  37  */
  38
  39 unsigned long flash_init(void)
  40 {
  41         volatile immap_t     *immap  = (immap_t *)CONFIG_SYS_IMMR;
  42         volatile memctl8xx_t *memctl = &immap->im_memctl;
  43         unsigned long size_b0;
  44         int i;
  45
  46         /* Init: no FLASHes known */
  47         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i)
  48                 flash_info[i].flash_id = FLASH_UNKNOWN;
  49
  50         /* Static FLASH Bank configuration here - FIXME XXX */
  51
  52         size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
  53
  54         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  55                 printf("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
  56                         size_b0, size_b0<<20);
  57         }
  58
  59         /* Remap FLASH according to real size */
  60         memctl->memc_or0 = CONFIG_SYS_OR_TIMING_FLASH | (-size_b0 & 0xFFFF8000);
  61 #ifdef CONFIG_FLASH_16BIT
  62         memctl->memc_br0 = (CONFIG_SYS_FLASH_BASE & BR_BA_MSK) |
  63                 BR_MS_GPCM | BR_V | BR_PS_16; /* 16 Bit data port */
  64 #else
  65         memctl->memc_br0 = (CONFIG_SYS_FLASH_BASE & BR_BA_MSK) |
  66                 BR_MS_GPCM | BR_V;
  67 #endif
  68
  69         /* Re-do sizing to get full correct info */
  70         size_b0 = flash_get_size((vu_long *)CONFIG_SYS_FLASH_BASE,
  71                         &flash_info[0]);
  72
  73         flash_get_offsets(CONFIG_SYS_FLASH_BASE, &flash_info[0]);
  74
  75 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
  76         /* monitor protection ON by default */
  77         flash_protect(FLAG_PROTECT_SET,
  78                       CONFIG_SYS_MONITOR_BASE,
  79                       CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
  80                       &flash_info[0]);
  81 #endif
  82
  83         memctl->memc_br1 = 0;           /* invalidate bank 1 */
  84
  85         flash_info[0].size = size_b0;
  86
  87         return size_b0;
  88 }
  89
  90 /*-----------------------------------------------------------------------
  91  */
  92 static void flash_get_offsets(ulong base, flash_info_t *info)
  93 {
  94         int i;
  95
  96         if (info->flash_id == FLASH_UNKNOWN)
  97                 return;
  98
  99         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 100                 for (i = 0; i < info->sector_count; i++)
 101                         info->start[i] = base + (i * 0x00002000);
 102
 103                 return;
 104         }
 105
 106         /* set up sector start address table */
 107         if (info->flash_id & FLASH_BTYPE) {
 108                 /* set sector offsets for bottom boot block type        */
 109 #ifdef CONFIG_FLASH_16BIT
 110                 info->start[0] = base + 0x00000000;
 111                 info->start[1] = base + 0x00004000;
 112                 info->start[2] = base + 0x00006000;
 113                 info->start[3] = base + 0x00008000;
 114                 for (i = 4; i < info->sector_count; i++)
 115                         info->start[i] = base + (i * 0x00010000) - 0x00030000;
 116 #else
 117                 info->start[0] = base + 0x00000000;
 118                 info->start[1] = base + 0x00008000;
 119                 info->start[2] = base + 0x0000C000;
 120                 info->start[3] = base + 0x00010000;
 121                 for (i = 4; i < info->sector_count; i++)
 122                         info->start[i] = base + (i * 0x00020000) - 0x00060000;
 123 #endif
 124         } else {
 125                 /* set sector offsets for top boot block type           */
 126                 i = info->sector_count - 1;
 127                 info->start[i--] = base + info->size - 0x00008000;
 128                 info->start[i--] = base + info->size - 0x0000C000;
 129                 info->start[i--] = base + info->size - 0x00010000;
 130                 for (; i >= 0; i--)
 131                         info->start[i] = base + i * 0x00020000;
 132         }
 133 }
 134
 135 /*-----------------------------------------------------------------------
 136  */
 137 void flash_print_info(flash_info_t *info)
 138 {
 139         int i;
 140
 141         if (info->flash_id == FLASH_UNKNOWN) {
 142                 printf("missing or unknown FLASH type\n");
 143                 return;
 144         }
 145
 146         switch (info->flash_id & FLASH_VENDMASK) {
 147         case FLASH_MAN_AMD:
 148                 printf("AMD ");
 149                 break;
 150         case FLASH_MAN_FUJ:
 151                 printf("FUJITSU ");
 152                 break;
 153         case FLASH_MAN_SST:
 154                 printf("SST ");
 155                 break;
 156         case FLASH_MAN_STM:
 157                 printf("STM ");
 158                 break;
 159         default:
 160                 printf("Unknown Vendor ");
 161                 break;
 162         }
 163
 164         switch (info->flash_id & FLASH_TYPEMASK) {
 165         case FLASH_AM400B:
 166                 printf("AM29LV400B (4 Mbit, bottom boot sect)\n");
 167                 break;
 168         case FLASH_AM400T:
 169                 printf("AM29LV400T (4 Mbit, top boot sector)\n");
 170                 break;
 171         case FLASH_AM800B:
 172                 printf("AM29LV800B (8 Mbit, bottom boot sect)\n");
 173                 break;
 174         case FLASH_AM800T:
 175                 printf("AM29LV800T (8 Mbit, top boot sector)\n");
 176                 break;
 177         case FLASH_AM160B:
 178                 printf("AM29LV160B (16 Mbit, bottom boot sect)\n");
 179                 break;
 180         case FLASH_AM160T:
 181                 printf("AM29LV160T (16 Mbit, top boot sector)\n");
 182                 break;
 183         case FLASH_AM320B:
 184                 printf("AM29LV320B (32 Mbit, bottom boot sect)\n");
 185                 break;
 186         case FLASH_AM320T:
 187                 printf("AM29LV320T (32 Mbit, top boot sector)\n");
 188                 break;
 189         case FLASH_SST200A:
 190                 printf("39xF200A (2M = 128K x 16)\n");
 191                 break;
 192         case FLASH_SST400A:
 193                 printf("39xF400A (4M = 256K x 16)\n");
 194                 break;
 195         case FLASH_SST800A:
 196                 printf("39xF800A (8M = 512K x 16)\n");
 197                 break;
 198         case FLASH_STM800AB:
 199                 printf("M29W800AB (8M = 512K x 16)\n");
 200                 break;
 201         default:
 202                 printf("Unknown Chip Type\n");
 203                 break;
 204         }
 205
 206         printf("  Size: %ld MB in %d Sectors\n",
 207                 info->size >> 20, info->sector_count);
 208
 209         printf("  Sector Start Addresses:");
 210         for (i = 0; i < info->sector_count; ++i) {
 211                 if ((i % 5) == 0)
 212                         printf("\n   ");
 213                 printf(" %08lX%s",
 214                         info->start[i],
 215                         info->protect[i] ? " (RO)" : "     "
 216                 );
 217         }
 218         printf("\n");
 219         return;
 220 }
 221
 222 /*
 223  * The following code cannot be run from FLASH!
 224  */
 225
 226 static ulong flash_get_size(vu_long *addr, flash_info_t *info)
 227 {
 228         short i;
 229         ulong value;
 230         ulong base = (ulong)addr;
 231
 232         /* Write auto select command: read Manufacturer ID */
 233 #ifdef CONFIG_FLASH_16BIT
 234         vu_short *s_addr = (vu_short *)addr;
 235         s_addr[0x5555] = 0x00AA;
 236         s_addr[0x2AAA] = 0x0055;
 237         s_addr[0x5555] = 0x0090;
 238         value = s_addr[0];
 239         value = value|(value<<16);
 240 #else
 241         addr[0x5555] = 0x00AA00AA;
 242         addr[0x2AAA] = 0x00550055;
 243         addr[0x5555] = 0x00900090;
 244         value = addr[0];
 245 #endif
 246
 247         switch (value) {
 248         case AMD_MANUFACT:
 249                 info->flash_id = FLASH_MAN_AMD;
 250                 break;
 251         case FUJ_MANUFACT:
 252                 info->flash_id = FLASH_MAN_FUJ;
 253                 break;
 254         case SST_MANUFACT:
 255                 info->flash_id = FLASH_MAN_SST;
 256                 break;
 257         case STM_MANUFACT:
 258                 info->flash_id = FLASH_MAN_STM;
 259                 break;
 260         default:
 261                 info->flash_id = FLASH_UNKNOWN;
 262                 info->sector_count = 0;
 263                 info->size = 0;
 264                 return 0;                       /* no or unknown flash  */
 265         }
 266 #ifdef CONFIG_FLASH_16BIT
 267         value = s_addr[1];
 268         value = value|(value<<16);
 269 #else
 270         value = addr[1];                        /* device ID            */
 271 #endif
 272
 273         switch (value) {
 274         case AMD_ID_LV400T:
 275                 info->flash_id += FLASH_AM400T;
 276                 info->sector_count = 11;
 277                 info->size = 0x00100000;
 278                 break;                          /* => 1 MB              */
 279
 280         case AMD_ID_LV400B:
 281                 info->flash_id += FLASH_AM400B;
 282                 info->sector_count = 11;
 283                 info->size = 0x00100000;
 284                 break;                          /* => 1 MB              */
 285
 286         case AMD_ID_LV800T:
 287                 info->flash_id += FLASH_AM800T;
 288                 info->sector_count = 19;
 289                 info->size = 0x00200000;
 290                 break;                          /* => 2 MB              */
 291
 292         case AMD_ID_LV800B:
 293                 info->flash_id += FLASH_AM800B;
 294 #ifdef CONFIG_FLASH_16BIT
 295                 info->sector_count = 19;
 296                 info->size = 0x00100000;        /* => 1 MB */
 297 #else
 298                 info->sector_count = 19;
 299                 info->size = 0x00200000;        /* => 2 MB      */
 300 #endif
 301                 break;
 302
 303         case AMD_ID_LV160T:
 304                 info->flash_id += FLASH_AM160T;
 305                 info->sector_count = 35;
 306                 info->size = 0x00400000;
 307                 break;                          /* => 4 MB              */
 308
 309         case AMD_ID_LV160B:
 310                 info->flash_id += FLASH_AM160B;
 311 #ifdef CONFIG_FLASH_16BIT
 312                 info->sector_count = 35;
 313                 info->size = 0x00200000;        /* => 2 MB      */
 314 #else
 315                 info->sector_count = 35;
 316                 info->size = 0x00400000;        /* => 4 MB      */
 317 #endif
 318
 319                 break;
 320         case SST_ID_xF200A:
 321                 info->flash_id += FLASH_SST200A;
 322                 info->sector_count = 64;        /* 39xF200A (2M = 128K x 16) */
 323                 info->size = 0x00080000;
 324                 break;
 325         case SST_ID_xF400A:
 326                 info->flash_id += FLASH_SST400A;
 327                 info->sector_count = 128;       /* 39xF400A (4M = 256K x 16) */
 328                 info->size = 0x00100000;
 329                 break;
 330         case SST_ID_xF800A:
 331                 info->flash_id += FLASH_SST800A;
 332                 info->sector_count = 256;       /* 39xF800A (8M = 512K x 16) */
 333                 info->size = 0x00200000;
 334                 break;                          /* => 2 MB              */
 335         case STM_ID_x800AB:
 336                 info->flash_id += FLASH_STM800AB;
 337                 info->sector_count = 19;
 338                 info->size = 0x00200000;
 339                 break;                          /* => 2 MB              */
 340         default:
 341                 info->flash_id = FLASH_UNKNOWN;
 342                 return 0;                       /* => no or unknown flash */
 343
 344         }
 345
 346         if (info->sector_count > CONFIG_SYS_MAX_FLASH_SECT) {
 347                 printf("** ERROR: sector count %d > max (%d) **\n",
 348                         info->sector_count, CONFIG_SYS_MAX_FLASH_SECT);
 349                 info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
 350         }
 351
 352         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 353                 for (i = 0; i < info->sector_count; i++)
 354                         info->start[i] = base + (i * 0x00002000);
 355         } else {        /* AMD and Fujitsu types */
 356                 /* set up sector start address table */
 357                 if (info->flash_id & FLASH_BTYPE) {
 358                         /* set sector offsets for bottom boot block type */
 359 #ifdef CONFIG_FLASH_16BIT
 360
 361                         info->start[0] = base + 0x00000000;
 362                         info->start[1] = base + 0x00004000;
 363                         info->start[2] = base + 0x00006000;
 364                         info->start[3] = base + 0x00008000;
 365                         for (i = 4; i < info->sector_count; i++)
 366                                 info->start[i] = base +
 367                                         (i * 0x00010000) - 0x00030000;
 368 #else
 369                         info->start[0] = base + 0x00000000;
 370                         info->start[1] = base + 0x00008000;
 371                         info->start[2] = base + 0x0000C000;
 372                         info->start[3] = base + 0x00010000;
 373                         for (i = 4; i < info->sector_count; i++)
 374                                 info->start[i] = base +
 375                                         (i * 0x00020000) - 0x00060000;
 376 #endif
 377                 } else {
 378                         /* set sector offsets for top boot block type   */
 379                         i = info->sector_count - 1;
 380                         info->start[i--] = base + info->size - 0x00008000;
 381                         info->start[i--] = base + info->size - 0x0000C000;
 382                         info->start[i--] = base + info->size - 0x00010000;
 383                         for (; i >= 0; i--)
 384                                 info->start[i] = base + i * 0x00020000;
 385                 }
 386
 387                 /* check for protected sectors */
 388                 for (i = 0; i < info->sector_count; i++) {
 389                         /*
 390                          * read sector protection at sector address:
 391                          * (A7 .. A0) = 0x02
 392                          * D0 = 1 if protected
 393                          */
 394 #ifdef CONFIG_FLASH_16BIT
 395                         s_addr = (volatile unsigned short *)(info->start[i]);
 396                         info->protect[i] = s_addr[2] & 1;
 397 #else
 398                         addr = (volatile unsigned long *)(info->start[i]);
 399                         info->protect[i] = addr[2] & 1;
 400 #endif
 401                 }
 402         }
 403
 404         /*
 405          * Prevent writes to uninitialized FLASH.
 406          */
 407         if (info->flash_id != FLASH_UNKNOWN) {
 408 #ifdef CONFIG_FLASH_16BIT
 409                 s_addr = (volatile unsigned short *)(info->start[0]);
 410                 *s_addr = 0x00F0;       /* reset bank */
 411 #else
 412                 addr = (volatile unsigned long *)info->start[0];
 413                 *addr = 0x00F000F0;     /* reset bank */
 414 #endif
 415
 416         }
 417         return info->size;
 418 }
 419
 420 int     flash_erase(flash_info_t *info, int s_first, int s_last)
 421 {
 422         vu_long *addr = (vu_long *)(info->start[0]);
 423         int flag, prot, sect;
 424         ulong start, now, last;
 425 #ifdef CONFIG_FLASH_16BIT
 426         vu_short *s_addr = (vu_short *)addr;
 427 #endif
 428
 429         if ((s_first < 0) || (s_first > s_last)) {
 430                 if (info->flash_id == FLASH_UNKNOWN)
 431                         printf("- missing\n");
 432                 else
 433                         printf("- no sectors to erase\n");
 434                 return 1;
 435         }
 436 /*#ifndef CONFIG_FLASH_16BIT
 437         ulong type;
 438         type = (info->flash_id & FLASH_VENDMASK);
 439         if ((type != FLASH_MAN_SST) && (type != FLASH_MAN_STM)) {
 440                 printf ("Can't erase unknown flash type %08lx - aborted\n",
 441                         info->flash_id);
 442                 return;
 443         }
 444 #endif*/
 445         prot = 0;
 446         for (sect = s_first; sect <= s_last; ++sect) {
 447                 if (info->protect[sect])
 448                         prot++;
 449         }
 450
 451         if (prot) {
 452                 printf("- Warning: %d protected sectors will not be erased!\n",
 453                         prot);
 454         } else {
 455                 printf("\n");
 456         }
 457
 458         start = get_timer(0);
 459         last  = start;
 460         /* Start erase on unprotected sectors */
 461         for (sect = s_first; sect <= s_last; sect++) {
 462                 if (info->protect[sect] == 0) { /* not protected */
 463 #ifdef CONFIG_FLASH_16BIT
 464                         vu_short *s_sect_addr = (vu_short *)(info->start[sect]);
 465 #else
 466                         vu_long *sect_addr = (vu_long *)(info->start[sect]);
 467 #endif
 468                         /* Disable interrupts which might cause a timeout */
 469                         flag = disable_interrupts();
 470
 471 #ifdef CONFIG_FLASH_16BIT
 472
 473                         /*printf("\ns_sect_addr=%x",s_sect_addr);*/
 474                         s_addr[0x5555] = 0x00AA;
 475                         s_addr[0x2AAA] = 0x0055;
 476                         s_addr[0x5555] = 0x0080;
 477                         s_addr[0x5555] = 0x00AA;
 478                         s_addr[0x2AAA] = 0x0055;
 479                         s_sect_addr[0] = 0x0030;
 480 #else
 481                         addr[0x5555] = 0x00AA00AA;
 482                         addr[0x2AAA] = 0x00550055;
 483                         addr[0x5555] = 0x00800080;
 484                         addr[0x5555] = 0x00AA00AA;
 485                         addr[0x2AAA] = 0x00550055;
 486                         sect_addr[0] = 0x00300030;
 487 #endif
 488                         /* re-enable interrupts if necessary */
 489                         if (flag)
 490                                 enable_interrupts();
 491
 492                         /* wait at least 80us - let's wait 1 ms */
 493                         udelay(1000);
 494
 495 #ifdef CONFIG_FLASH_16BIT
 496                         while ((s_sect_addr[0] & 0x0080) != 0x0080) {
 497 #else
 498                         while ((sect_addr[0] & 0x00800080) != 0x00800080) {
 499 #endif
 500                                 now = get_timer(start);
 501                                 if (now > CONFIG_SYS_FLASH_ERASE_TOUT) {
 502                                         printf("Timeout\n");
 503                                         return 1;
 504                                 }
 505                                 /* show every second that we're waiting */
 506                                 if ((now - last) > 1000) {
 507                                         putc('.');
 508                                         last = now;
 509                                 }
 510                         }
 511                 }
 512         }
 513
 514         /* reset to read mode */
 515         addr = (volatile unsigned long *)info->start[0];
 516 #ifdef CONFIG_FLASH_16BIT
 517         s_addr[0] = 0x00F0;     /* reset bank */
 518 #else
 519         addr[0] = 0x00F000F0;   /* reset bank */
 520 #endif
 521
 522         printf(" done\n");
 523         return 0;
 524 }
 525
 526 /*-----------------------------------------------------------------------
 527  * Copy memory to flash, returns:
 528  * 0 - OK
 529  * 1 - write timeout
 530  * 2 - Flash not erased
 531  * 4 - Flash not identified
 532  */
 533
 534 int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 535 {
 536         ulong cp, wp, data;
 537         int i, l, rc;
 538
 539         if (info->flash_id == FLASH_UNKNOWN)
 540                 return 4;
 541
 542         wp = (addr & ~3);       /* get lower word aligned address */
 543
 544         /*
 545          * handle unaligned start bytes
 546          */
 547         l = addr - wp;
 548
 549         if (l != 0) {
 550                 data = 0;
 551                 for (i = 0, cp = wp; i < l; ++i, ++cp)
 552                         data = (data << 8) | (*(uchar *)cp);
 553
 554                 for (; i < 4 && cnt > 0; ++i) {
 555                         data = (data << 8) | *src++;
 556                         --cnt;
 557                         ++cp;
 558                 }
 559                 for (; cnt == 0 && i < 4; ++i, ++cp)
 560                         data = (data << 8) | (*(uchar *)cp);
 561
 562                 rc = write_word(info, wp, data);
 563
 564                 if (rc != 0)
 565                         return rc;
 566
 567                 wp += 4;
 568         }
 569
 570         /*
 571          * handle word aligned part
 572          */
 573         while (cnt >= 4) {
 574                 data = 0;
 575                 for (i = 0; i < 4; ++i)
 576                         data = (data << 8) | *src++;
 577
 578                 rc = write_word(info, wp, data);
 579                 if (rc != 0)
 580                         return rc;
 581
 582                 wp  += 4;
 583                 cnt -= 4;
 584         }
 585
 586         if (cnt == 0)
 587                 return 0;
 588
 589         /*
 590          * handle unaligned tail bytes
 591          */
 592         data = 0;
 593         for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
 594                 data = (data << 8) | *src++;
 595                 --cnt;
 596         }
 597         for (; i < 4; ++i, ++cp)
 598                 data = (data << 8) | (*(uchar *)cp);
 599
 600         return write_word(info, wp, data);
 601 }
 602
 603 /*-----------------------------------------------------------------------
 604  * Write a word to Flash, returns:
 605  * 0 - OK
 606  * 1 - write timeout
 607  * 2 - Flash not erased
 608  */
 609 static int write_word(flash_info_t *info, ulong dest, ulong data)
 610 {
 611         vu_long *addr = (vu_long *)(info->start[0]);
 612
 613 #ifdef CONFIG_FLASH_16BIT
 614         vu_short high_data;
 615         vu_short low_data;
 616         vu_short *s_addr = (vu_short *)addr;
 617 #endif
 618         ulong start;
 619         int flag;
 620
 621         /* Check if Flash is (sufficiently) erased */
 622         if ((*((vu_long *)dest) & data) != data)
 623                 return 2;
 624
 625 #ifdef CONFIG_FLASH_16BIT
 626         /* Write the 16 higher-bits */
 627         /* Disable interrupts which might cause a timeout here */
 628         flag = disable_interrupts();
 629
 630         high_data = ((data>>16) & 0x0000ffff);
 631
 632         s_addr[0x5555] = 0x00AA;
 633         s_addr[0x2AAA] = 0x0055;
 634         s_addr[0x5555] = 0x00A0;
 635
 636         *((vu_short *)dest) = high_data;
 637
 638         /* re-enable interrupts if necessary */
 639         if (flag)
 640                 enable_interrupts();
 641
 642         /* data polling for D7 */
 643         start = get_timer(0);
 644         while ((*((vu_short *)dest) & 0x0080) != (high_data & 0x0080)) {
 645                 if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT)
 646                         return 1;
 647         }
 648
 649         /* Write the 16 lower-bits */
 650 #endif
 651
 652         /* Disable interrupts which might cause a timeout here */
 653         flag = disable_interrupts();
 654 #ifdef CONFIG_FLASH_16BIT
 655         dest += 0x2;
 656         low_data = (data & 0x0000ffff);
 657
 658         s_addr[0x5555] = 0x00AA;
 659         s_addr[0x2AAA] = 0x0055;
 660         s_addr[0x5555] = 0x00A0;
 661         *((vu_short *)dest) = low_data;
 662
 663 #else
 664         addr[0x5555] = 0x00AA00AA;
 665         addr[0x2AAA] = 0x00550055;
 666         addr[0x5555] = 0x00A000A0;
 667         *((vu_long *)dest) = data;
 668 #endif
 669
 670         /* re-enable interrupts if necessary */
 671         if (flag)
 672                 enable_interrupts();
 673
 674         /* data polling for D7 */
 675         start = get_timer(0);
 676
 677 #ifdef CONFIG_FLASH_16BIT
 678         while ((*((vu_short *)dest) & 0x0080) != (low_data & 0x0080)) {
 679 #else
 680         while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
 681 #endif
 682
 683                 if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT)
 684                         return 1;
 685         }
 686         return 0;
 687 }