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         debug ("Protect %senvironment: %08lx ... %08lx\n",
 120 # ifdef CFG_ENV_ADDR_REDUND
 121                 "primary   ",
 122 # else
 123                 "",
 124 # endif
 125                 (ulong)CFG_ENV_ADDR,
 126                 (ulong)CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1);
 127
 128         flash_protect(FLAG_PROTECT_SET,
 129                       CFG_ENV_ADDR,
 130                       CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1,
 131                       &flash_info[0]);
 132 #endif
 133
 134 #ifdef CFG_ENV_ADDR_REDUND
 135         debug ("Protect redundand environment: %08lx ... %08lx\n",
 136                 (ulong)CFG_ENV_ADDR_REDUND,
 137                 (ulong)CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1);
 138
 139         flash_protect(FLAG_PROTECT_SET,
 140                       CFG_ENV_ADDR_REDUND,
 141                       CFG_ENV_ADDR_REDUND + CFG_ENV_SECT_SIZE - 1,
 142                       &flash_info[0]);
 143 #endif
 144
 145         if (size_b1) {
 146                 memctl->memc_or1 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
 147                 memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
 148                                     BR_MS_GPCM | BR_V;
 149
 150                 debug ("## BR1: 0x%08x    OR1: 0x%08x\n",
 151                         memctl->memc_br1, memctl->memc_or1);
 152
 153                 /* Re-do sizing to get full correct info */
 154                 size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
 155                                           &flash_info[1]);
 156
 157 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
 158                 /* monitor protection ON by default */
 159                 flash_protect(FLAG_PROTECT_SET,
 160                               CFG_MONITOR_BASE,
 161                               CFG_MONITOR_BASE+monitor_flash_len-1,
 162                               &flash_info[1]);
 163 #endif
 164
 165 #ifdef  CFG_ENV_IS_IN_FLASH
 166                 /* ENV protection ON by default */
 167                 flash_protect(FLAG_PROTECT_SET,
 168                               CFG_ENV_ADDR,
 169                               CFG_ENV_ADDR+CFG_ENV_SIZE-1,
 170                               &flash_info[1]);
 171 #endif
 172         } else {
 173                 memctl->memc_br1 = 0;           /* invalidate bank */
 174
 175                 flash_info[1].flash_id = FLASH_UNKNOWN;
 176                 flash_info[1].sector_count = -1;
 177                 flash_info[1].size = 0;
 178
 179                 debug ("## DISABLE BR1: 0x%08x    OR1: 0x%08x\n",
 180                         memctl->memc_br1, memctl->memc_or1);
 181         }
 182
 183         debug ("## Final Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);
 184
 185         flash_info[0].size = size_b0;
 186         flash_info[1].size = size_b1;
 187
 188         return (size_b0 + size_b1);
 189 }
 190
 191 /*-----------------------------------------------------------------------
 192  */
 193 void flash_print_info  (flash_info_t *info)
 194 {
 195         int i;
 196
 197         if (info->flash_id == FLASH_UNKNOWN) {
 198                 printf ("missing or unknown FLASH type\n");
 199                 return;
 200         }
 201
 202         switch (info->flash_id & FLASH_VENDMASK) {
 203         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 204         case FLASH_MAN_FUJ:     printf ("FUJITSU ");            break;
 205         default:                printf ("Unknown Vendor ");     break;
 206         }
 207
 208         switch (info->flash_id & FLASH_TYPEMASK) {
 209 #ifdef CONFIG_TQM8xxM   /* mirror bit flash */
 210         case FLASH_AMLV128U:    printf ("AM29LV128ML (128Mbit, uniform sector size)\n");
 211                                 break;
 212 # else  /* ! TQM8xxM */
 213         case FLASH_AM400B:      printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 214                                 break;
 215         case FLASH_AM400T:      printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 216                                 break;
 217         case FLASH_AM800B:      printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 218                                 break;
 219         case FLASH_AM800T:      printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 220                                 break;
 221         case FLASH_AM160B:      printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 222                                 break;
 223         case FLASH_AM160T:      printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 224                                 break;
 225         case FLASH_AM320B:      printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 226                                 break;
 227         case FLASH_AM320T:      printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 228                                 break;
 229 #endif  /* TQM8xxM */
 230         default:                printf ("Unknown Chip Type\n");
 231                                 break;
 232         }
 233
 234         printf ("  Size: %ld MB in %d Sectors\n",
 235                 info->size >> 20, info->sector_count);
 236
 237         printf ("  Sector Start Addresses:");
 238         for (i=0; i<info->sector_count; ++i) {
 239                 if ((i % 5) == 0)
 240                         printf ("\n   ");
 241                 printf (" %08lX%s",
 242                         info->start[i],
 243                         info->protect[i] ? " (RO)" : "     "
 244                 );
 245         }
 246         printf ("\n");
 247         return;
 248 }
 249
 250 /*-----------------------------------------------------------------------
 251  */
 252
 253
 254 /*-----------------------------------------------------------------------
 255  */
 256
 257 /*
 258  * The following code cannot be run from FLASH!
 259  */
 260
 261 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 262 {
 263         short i;
 264         ulong value;
 265         ulong base = (ulong)addr;
 266
 267         /* Write auto select command: read Manufacturer ID */
 268         addr[0x0555] = 0x00AA00AA;
 269         addr[0x02AA] = 0x00550055;
 270         addr[0x0555] = 0x00900090;
 271
 272         value = addr[0];
 273
 274         debug ("Manuf. ID @ 0x%08lx: 0x%08lx\n", (ulong)addr, value);
 275
 276         switch (value) {
 277         case AMD_MANUFACT:
 278                 info->flash_id = FLASH_MAN_AMD;
 279                 break;
 280         case FUJ_MANUFACT:
 281                 info->flash_id = FLASH_MAN_FUJ;
 282                 break;
 283         default:
 284                 info->flash_id = FLASH_UNKNOWN;
 285                 info->sector_count = 0;
 286                 info->size = 0;
 287                 return (0);                     /* no or unknown flash  */
 288         }
 289
 290         value = addr[1];                        /* device ID            */
 291
 292         debug ("Device ID @ 0x%08lx: 0x%08lx\n", (ulong)(&addr[1]), value);
 293
 294         switch (value) {
 295 #ifdef CONFIG_TQM8xxM   /* mirror bit flash */
 296         case AMD_ID_MIRROR:
 297                 switch(addr[14]) {
 298                 case AMD_ID_LV128U_2:
 299                         if (addr[15] != AMD_ID_LV128U_3) {
 300                                 info->flash_id = FLASH_UNKNOWN;
 301                         }
 302                         else {
 303                                 info->flash_id += FLASH_AMLV128U;
 304                                 info->sector_count = 256;
 305                                 info->size = 0x02000000;
 306                         }
 307                         break;                          /* => 32 MB             */
 308                 default:
 309                         info->flash_id = FLASH_UNKNOWN;
 310                         break;
 311                 }
 312                 break;
 313 # else  /* ! TQM8xxM */
 314         case AMD_ID_LV400T:
 315                 info->flash_id += FLASH_AM400T;
 316                 info->sector_count = 11;
 317                 info->size = 0x00100000;
 318                 break;                          /* => 1 MB              */
 319
 320         case AMD_ID_LV400B:
 321                 info->flash_id += FLASH_AM400B;
 322                 info->sector_count = 11;
 323                 info->size = 0x00100000;
 324                 break;                          /* => 1 MB              */
 325
 326         case AMD_ID_LV800T:
 327                 info->flash_id += FLASH_AM800T;
 328                 info->sector_count = 19;
 329                 info->size = 0x00200000;
 330                 break;                          /* => 2 MB              */
 331
 332         case AMD_ID_LV800B:
 333                 info->flash_id += FLASH_AM800B;
 334                 info->sector_count = 19;
 335                 info->size = 0x00200000;
 336                 break;                          /* => 2 MB              */
 337
 338         case AMD_ID_LV160T:
 339                 info->flash_id += FLASH_AM160T;
 340                 info->sector_count = 35;
 341                 info->size = 0x00400000;
 342                 break;                          /* => 4 MB              */
 343
 344         case AMD_ID_LV160B:
 345                 info->flash_id += FLASH_AM160B;
 346                 info->sector_count = 35;
 347                 info->size = 0x00400000;
 348                 break;                          /* => 4 MB              */
 349
 350         case AMD_ID_LV320T:
 351                 info->flash_id += FLASH_AM320T;
 352                 info->sector_count = 71;
 353                 info->size = 0x00800000;
 354                 break;                          /* => 8 MB              */
 355
 356         case AMD_ID_LV320B:
 357                 info->flash_id += FLASH_AM320B;
 358                 info->sector_count = 71;
 359                 info->size = 0x00800000;
 360                 break;                          /* => 8 MB              */
 361 #endif  /* TQM8xxM */
 362         default:
 363                 info->flash_id = FLASH_UNKNOWN;
 364                 return (0);                     /* => no or unknown flash */
 365         }
 366
 367         /* set up sector start address table */
 368         switch (value) {
 369 #ifdef CONFIG_TQM8xxM   /* mirror bit flash */
 370         case AMD_ID_MIRROR:
 371                 switch (info->flash_id & FLASH_TYPEMASK) {
 372                         /* only known types here - no default */
 373                 case FLASH_AMLV128U:
 374                         for (i = 0; i < info->sector_count; i++) {
 375                                 info->start[i] = base;
 376                                 base += 0x20000;
 377                         }
 378                         break;
 379                 }
 380                 break;
 381 # else  /* ! TQM8xxM */
 382         case AMD_ID_LV400B:
 383         case AMD_ID_LV800B:
 384         case AMD_ID_LV160B:
 385                 /* set sector offsets for bottom boot block type        */
 386                 info->start[0] = base + 0x00000000;
 387                 info->start[1] = base + 0x00008000;
 388                 info->start[2] = base + 0x0000C000;
 389                 info->start[3] = base + 0x00010000;
 390                 for (i = 4; i < info->sector_count; i++) {
 391                         info->start[i] = base + (i * 0x00020000) - 0x00060000;
 392                 }
 393                 break;
 394         case AMD_ID_LV400T:
 395         case AMD_ID_LV800T:
 396         case AMD_ID_LV160T:
 397                 /* set sector offsets for top boot block type           */
 398                 i = info->sector_count - 1;
 399                 info->start[i--] = base + info->size - 0x00008000;
 400                 info->start[i--] = base + info->size - 0x0000C000;
 401                 info->start[i--] = base + info->size - 0x00010000;
 402                 for (; i >= 0; i--) {
 403                         info->start[i] = base + i * 0x00020000;
 404                 }
 405                 break;
 406         case AMD_ID_LV320B:
 407                 for (i = 0; i < info->sector_count; i++) {
 408                         info->start[i] = base;
 409                         /*
 410                          * The first 8 sectors are 8 kB,
 411                          * all the other ones  are 64 kB
 412                          */
 413                         base += (i < 8)
 414                                 ?  2 * ( 8 << 10)
 415                                 :  2 * (64 << 10);
 416                 }
 417                 break;
 418         case AMD_ID_LV320T:
 419                 for (i = 0; i < info->sector_count; i++) {
 420                         info->start[i] = base;
 421                         /*
 422                          * The last 8 sectors are 8 kB,
 423                          * all the other ones  are 64 kB
 424                          */
 425                         base += (i < (info->sector_count - 8))
 426                                 ?  2 * (64 << 10)
 427                                 :  2 * ( 8 << 10);
 428                 }
 429                 break;
 430 #endif  /* TQM8xxM */
 431         default:
 432                 return (0);
 433                 break;
 434         }
 435
 436         /* check for protected sectors */
 437         for (i = 0; i < info->sector_count; i++) {
 438                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 439                 /* D0 = 1 if protected */
 440                 addr = (volatile unsigned long *)(info->start[i]);
 441                 info->protect[i] = addr[2] & 1;
 442         }
 443
 444         /*
 445          * Prevent writes to uninitialized FLASH.
 446          */
 447         if (info->flash_id != FLASH_UNKNOWN) {
 448                 addr = (volatile unsigned long *)info->start[0];
 449
 450                 *addr = 0x00F000F0;     /* reset bank */
 451         }
 452
 453         return (info->size);
 454 }
 455
 456
 457 /*-----------------------------------------------------------------------
 458  */
 459
 460 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 461 {
 462         vu_long *addr = (vu_long*)(info->start[0]);
 463         int flag, prot, sect, l_sect;
 464         ulong start, now, last;
 465
 466         debug ("flash_erase: first: %d last: %d\n", s_first, s_last);
 467
 468         if ((s_first < 0) || (s_first > s_last)) {
 469                 if (info->flash_id == FLASH_UNKNOWN) {
 470                         printf ("- missing\n");
 471                 } else {
 472                         printf ("- no sectors to erase\n");
 473                 }
 474                 return 1;
 475         }
 476
 477         if ((info->flash_id == FLASH_UNKNOWN) ||
 478             (info->flash_id > FLASH_AMD_COMP)) {
 479                 printf ("Can't erase unknown flash type %08lx - aborted\n",
 480                         info->flash_id);
 481                 return 1;
 482         }
 483
 484         prot = 0;
 485         for (sect=s_first; sect<=s_last; ++sect) {
 486                 if (info->protect[sect]) {
 487                         prot++;
 488                 }
 489         }
 490
 491         if (prot) {
 492                 printf ("- Warning: %d protected sectors will not be erased!\n",
 493                         prot);
 494         } else {
 495                 printf ("\n");
 496         }
 497
 498         l_sect = -1;
 499
 500         /* Disable interrupts which might cause a timeout here */
 501         flag = disable_interrupts();
 502
 503         addr[0x0555] = 0x00AA00AA;
 504         addr[0x02AA] = 0x00550055;
 505         addr[0x0555] = 0x00800080;
 506         addr[0x0555] = 0x00AA00AA;
 507         addr[0x02AA] = 0x00550055;
 508
 509         /* Start erase on unprotected sectors */
 510         for (sect = s_first; sect<=s_last; sect++) {
 511                 if (info->protect[sect] == 0) { /* not protected */
 512                         addr = (vu_long*)(info->start[sect]);
 513                         addr[0] = 0x00300030;
 514                         l_sect = sect;
 515                 }
 516         }
 517
 518         /* re-enable interrupts if necessary */
 519         if (flag)
 520                 enable_interrupts();
 521
 522         /* wait at least 80us - let's wait 1 ms */
 523         udelay (1000);
 524
 525         /*
 526          * We wait for the last triggered sector
 527          */
 528         if (l_sect < 0)
 529                 goto DONE;
 530
 531         start = get_timer (0);
 532         last  = start;
 533         addr = (vu_long*)(info->start[l_sect]);
 534         while ((addr[0] & 0x00800080) != 0x00800080) {
 535                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 536                         printf ("Timeout\n");
 537                         return 1;
 538                 }
 539                 /* show that we're waiting */
 540                 if ((now - last) > 1000) {      /* every second */
 541                         putc ('.');
 542                         last = now;
 543                 }
 544         }
 545
 546 DONE:
 547         /* reset to read mode */
 548         addr = (volatile unsigned long *)info->start[0];
 549         addr[0] = 0x00F000F0;   /* reset bank */
 550
 551         printf (" done\n");
 552         return 0;
 553 }
 554
 555 /*-----------------------------------------------------------------------
 556  * Copy memory to flash, returns:
 557  * 0 - OK
 558  * 1 - write timeout
 559  * 2 - Flash not erased
 560  */
 561
 562 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 563 {
 564         ulong cp, wp, data;
 565         int i, l, rc;
 566
 567         wp = (addr & ~3);       /* get lower word aligned address */
 568
 569         /*
 570          * handle unaligned start bytes
 571          */
 572         if ((l = addr - wp) != 0) {
 573                 data = 0;
 574                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 575                         data = (data << 8) | (*(uchar *)cp);
 576                 }
 577                 for (; i<4 && cnt>0; ++i) {
 578                         data = (data << 8) | *src++;
 579                         --cnt;
 580                         ++cp;
 581                 }
 582                 for (; cnt==0 && i<4; ++i, ++cp) {
 583                         data = (data << 8) | (*(uchar *)cp);
 584                 }
 585
 586                 if ((rc = write_word(info, wp, data)) != 0) {
 587                         return (rc);
 588                 }
 589                 wp += 4;
 590         }
 591
 592         /*
 593          * handle word aligned part
 594          */
 595         while (cnt >= 4) {
 596                 data = 0;
 597                 for (i=0; i<4; ++i) {
 598                         data = (data << 8) | *src++;
 599                 }
 600                 if ((rc = write_word(info, wp, data)) != 0) {
 601                         return (rc);
 602                 }
 603                 wp  += 4;
 604                 cnt -= 4;
 605         }
 606
 607         if (cnt == 0) {
 608                 return (0);
 609         }
 610
 611         /*
 612          * handle unaligned tail bytes
 613          */
 614         data = 0;
 615         for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 616                 data = (data << 8) | *src++;
 617                 --cnt;
 618         }
 619         for (; i<4; ++i, ++cp) {
 620                 data = (data << 8) | (*(uchar *)cp);
 621         }
 622
 623         return (write_word(info, wp, data));
 624 }
 625
 626 /*-----------------------------------------------------------------------
 627  * Write a word to Flash, returns:
 628  * 0 - OK
 629  * 1 - write timeout
 630  * 2 - Flash not erased
 631  */
 632 static int write_word (flash_info_t *info, ulong dest, ulong data)
 633 {
 634         vu_long *addr = (vu_long*)(info->start[0]);
 635         ulong start;
 636         int flag;
 637
 638         /* Check if Flash is (sufficiently) erased */
 639         if ((*((vu_long *)dest) & data) != data) {
 640                 return (2);
 641         }
 642         /* Disable interrupts which might cause a timeout here */
 643         flag = disable_interrupts();
 644
 645         addr[0x0555] = 0x00AA00AA;
 646         addr[0x02AA] = 0x00550055;
 647         addr[0x0555] = 0x00A000A0;
 648
 649         *((vu_long *)dest) = data;
 650
 651         /* re-enable interrupts if necessary */
 652         if (flag)
 653                 enable_interrupts();
 654
 655         /* data polling for D7 */
 656         start = get_timer (0);
 657         while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
 658                 if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 659                         return (1);
 660                 }
 661         }
 662         return (0);
 663 }
 664
 665 /*-----------------------------------------------------------------------
 666  */