board/lwmon/flash.c

   1 /*
   2  * (C) Copyright 2001
   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
  29 #if defined(CONFIG_ENV_IS_IN_FLASH)
  30 # ifndef  CFG_ENV_ADDR
  31 #  define CFG_ENV_ADDR  (CFG_FLASH_BASE + CFG_ENV_OFFSET)
  32 # endif
  33 # ifndef  CFG_ENV_SIZE
  34 #  define CFG_ENV_SIZE  CFG_ENV_SECT_SIZE
  35 # endif
  36 # ifndef  CFG_ENV_SECT_SIZE
  37 #  define CFG_ENV_SECT_SIZE  CFG_ENV_SIZE
  38 # endif
  39 #endif
  40
  41 /*---------------------------------------------------------------------*/
  42
  43 flash_info_t    flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips        */
  44
  45 /*-----------------------------------------------------------------------
  46  * Functions
  47  */
  48 static ulong flash_get_size (vu_long *addr, flash_info_t *info);
  49 static int write_data (flash_info_t *info, ulong dest, ulong data);
  50 #ifdef CFG_FLASH_USE_BUFFER_WRITE
  51 static int write_data_buf (flash_info_t * info, ulong dest, uchar * cp, int len);
  52 #endif
  53 static void flash_get_offsets (ulong base, flash_info_t *info);
  54
  55 /*-----------------------------------------------------------------------
  56  */
  57
  58 unsigned long flash_init (void)
  59 {
  60         volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
  61         volatile memctl8xx_t *memctl = &immap->im_memctl;
  62         unsigned long size_b0, size_b1;
  63         int i;
  64
  65         /* Init: no FLASHes known */
  66         for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
  67                 flash_info[i].flash_id = FLASH_UNKNOWN;
  68         }
  69
  70         /* Static FLASH Bank configuration here - FIXME XXX */
  71
  72         debug ("\n## Get flash bank 1 size @ 0x%08x\n",FLASH_BASE0_PRELIM);
  73
  74         size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
  75
  76         if (flash_info[0].flash_id == FLASH_UNKNOWN) {
  77                 printf ("## Unknown FLASH on Bank 0: "
  78                         "ID 0x%lx, Size = 0x%08lx = %ld MB\n",
  79                         flash_info[0].flash_id,
  80                         size_b0, size_b0<<20);
  81         }
  82
  83         debug ("## Get flash bank 2 size @ 0x%08x\n",FLASH_BASE1_PRELIM);
  84
  85         size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
  86
  87         debug ("## Prelim. Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);
  88
  89         if (size_b1 > size_b0) {
  90                 printf ("## ERROR: "
  91                         "Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
  92                         size_b1, size_b1<<20,
  93                         size_b0, size_b0<<20
  94                 );
  95                 flash_info[0].flash_id  = FLASH_UNKNOWN;
  96                 flash_info[1].flash_id  = FLASH_UNKNOWN;
  97                 flash_info[0].sector_count      = -1;
  98                 flash_info[1].sector_count      = -1;
  99                 flash_info[0].size              = 0;
 100                 flash_info[1].size              = 0;
 101                 return (0);
 102         }
 103
 104         debug  ("## Before remap: "
 105                 "BR0: 0x%08x    OR0: 0x%08x    "
 106                 "BR1: 0x%08x    OR1: 0x%08x\n",
 107                 memctl->memc_br0, memctl->memc_or0,
 108                 memctl->memc_br1, memctl->memc_or1);
 109
 110         /* Remap FLASH according to real size */
 111         memctl->memc_or0 = (-size_b0 & 0xFFFF8000) | CFG_OR_TIMING_FLASH |
 112                                 OR_CSNT_SAM | OR_ACS_DIV1;
 113         memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_PS_32 | BR_V;
 114
 115         debug ("## BR0: 0x%08x    OR0: 0x%08x\n",
 116                 memctl->memc_br0, memctl->memc_or0);
 117
 118         /* Re-do sizing to get full correct info */
 119         size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
 120
 121         flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);
 122
 123         flash_info[0].size = size_b0;
 124
 125 #if CFG_MONITOR_BASE >= CFG_FLASH_BASE
 126         /* monitor protection ON by default */
 127         flash_protect(FLAG_PROTECT_SET,
 128                       CFG_MONITOR_BASE,
 129                       CFG_MONITOR_BASE+monitor_flash_len-1,
 130                       &flash_info[0]);
 131 #endif
 132
 133 #ifdef  CONFIG_ENV_IS_IN_FLASH
 134         /* ENV protection ON by default */
 135         flash_protect(FLAG_PROTECT_SET,
 136                       CFG_ENV_ADDR,
 137                       CFG_ENV_ADDR+CFG_ENV_SECT_SIZE-1,
 138                       &flash_info[0]);
 139 #endif
 140
 141         if (size_b1) {
 142                 memctl->memc_or1 = (-size_b1 & 0xFFFF8000) | CFG_OR_TIMING_FLASH |
 143                                         OR_CSNT_SAM | OR_ACS_DIV1;
 144                 memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
 145                                         BR_PS_32 | BR_V;
 146
 147                 debug ("## BR1: 0x%08x    OR1: 0x%08x\n",
 148                         memctl->memc_br1, memctl->memc_or1);
 149
 150                 /* Re-do sizing to get full correct info */
 151                 size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
 152                                           &flash_info[1]);
 153
 154                 flash_info[1].size = size_b1;
 155
 156                 flash_get_offsets (CFG_FLASH_BASE + size_b0, &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  CONFIG_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_SECT_SIZE-1,
 171                               &flash_info[1]);
 172 #endif
 173         } else {
 174                 memctl->memc_br1 = 0;           /* invalidate bank */
 175                 memctl->memc_or1 = 0;           /* invalidate bank */
 176
 177                 debug ("## DISABLE BR1: 0x%08x    OR1: 0x%08x\n",
 178                         memctl->memc_br1, memctl->memc_or1);
 179
 180                 flash_info[1].flash_id = FLASH_UNKNOWN;
 181                 flash_info[1].sector_count = -1;
 182                 flash_info[1].size = 0;
 183         }
 184
 185         debug ("## Final Flash bank sizes: %08lx + 0x%08lx\n",size_b0,size_b1);
 186
 187         return (size_b0 + size_b1);
 188 }
 189
 190 /*-----------------------------------------------------------------------
 191  */
 192 static void flash_get_offsets (ulong base, flash_info_t *info)
 193 {
 194         int i;
 195
 196         if (info->flash_id == FLASH_UNKNOWN) {
 197                 return;
 198         }
 199
 200         switch (info->flash_id & FLASH_VENDMASK) {
 201         case FLASH_MAN_INTEL:
 202             for (i = 0; i < info->sector_count; i++) {
 203                 info->start[i] = base;
 204                 base += 0x00020000 * 2;         /* 128k * 2 chips per bank */
 205             }
 206             return;
 207
 208         default:
 209             printf ("Don't know sector ofsets for flash type 0x%lx\n",
 210                 info->flash_id);
 211             return;
 212         }
 213 }
 214
 215 /*-----------------------------------------------------------------------
 216  */
 217 void flash_print_info  (flash_info_t *info)
 218 {
 219         int i;
 220
 221         if (info->flash_id == FLASH_UNKNOWN) {
 222                 printf ("missing or unknown FLASH type\n");
 223                 return;
 224         }
 225
 226         switch (info->flash_id & FLASH_VENDMASK) {
 227         case FLASH_MAN_AMD:     printf ("AMD ");                break;
 228         case FLASH_MAN_FUJ:     printf ("Fujitsu ");            break;
 229         case FLASH_MAN_SST:     printf ("SST ");                break;
 230         case FLASH_MAN_STM:     printf ("STM ");                break;
 231         case FLASH_MAN_INTEL:   printf ("Intel ");              break;
 232         case FLASH_MAN_MT:      printf ("MT ");                 break;
 233         default:                printf ("Unknown Vendor ");     break;
 234         }
 235
 236         switch (info->flash_id & FLASH_TYPEMASK) {
 237         case FLASH_28F320J3A:   printf ("28F320J3A (32Mbit = 128K x 32)\n");
 238                                 break;
 239         case FLASH_28F640J3A:   printf ("28F640J3A (64Mbit = 128K x 64)\n");
 240                                 break;
 241         case FLASH_28F128J3A:   printf ("28F128J3A (128Mbit = 128K x 128)\n");
 242                                 break;
 243         default:                printf ("Unknown Chip Type\n");
 244                                 break;
 245         }
 246
 247         if (info->size >= (1 << 20)) {
 248                 i = 20;
 249         } else {
 250                 i = 10;
 251         }
 252         printf ("  Size: %ld %cB in %d Sectors\n",
 253                 info->size >> i,
 254                 (i == 20) ? 'M' : 'k',
 255                 info->sector_count);
 256
 257         printf ("  Sector Start Addresses:");
 258         for (i=0; i<info->sector_count; ++i) {
 259                 if ((i % 5) == 0)
 260                         printf ("\n   ");
 261                 printf (" %08lX%s",
 262                         info->start[i],
 263                         info->protect[i] ? " (RO)" : "     "
 264                 );
 265         }
 266         printf ("\n");
 267         return;
 268 }
 269
 270 /*-----------------------------------------------------------------------
 271  */
 272
 273
 274 /*-----------------------------------------------------------------------
 275  */
 276
 277 /*
 278  * The following code cannot be run from FLASH!
 279  */
 280
 281 static ulong flash_get_size (vu_long *addr, flash_info_t *info)
 282 {
 283         ulong value;
 284
 285         /* Read Manufacturer ID */
 286         addr[0] = 0x00900090;
 287         value = addr[0];
 288
 289         debug ("Manuf. ID @ 0x%08lx: 0x%08lx\n", (ulong)addr, value);
 290
 291         switch (value) {
 292         case AMD_MANUFACT:
 293                 info->flash_id = FLASH_MAN_AMD;
 294                 break;
 295         case FUJ_MANUFACT:
 296                 info->flash_id = FLASH_MAN_FUJ;
 297                 break;
 298         case SST_MANUFACT:
 299                 info->flash_id = FLASH_MAN_SST;
 300                 break;
 301         case STM_MANUFACT:
 302                 info->flash_id = FLASH_MAN_STM;
 303                 break;
 304         case INTEL_MANUFACT:
 305                 info->flash_id = FLASH_MAN_INTEL;
 306                 break;
 307         default:
 308                 info->flash_id = FLASH_UNKNOWN;
 309                 info->sector_count = 0;
 310                 info->size = 0;
 311                 addr[0] = 0x00FF00FF;           /* restore read mode */
 312                 return (0);                     /* no or unknown flash  */
 313         }
 314
 315         value = addr[1];                        /* device ID            */
 316
 317         debug ("Device ID @ 0x%08lx: 0x%08lx\n", (ulong)(&addr[1]), value);
 318
 319         switch (value) {
 320         case INTEL_ID_28F320J3A:
 321                 info->flash_id += FLASH_28F320J3A;
 322                 info->sector_count = 32;
 323                 info->size = 0x00400000 * 2;
 324                 break;                          /* =>  8 MB             */
 325
 326         case INTEL_ID_28F640J3A:
 327                 info->flash_id += FLASH_28F640J3A;
 328                 info->sector_count = 64;
 329                 info->size = 0x00800000 * 2;
 330                 break;                          /* => 16 MB             */
 331
 332         case INTEL_ID_28F128J3A:
 333                 info->flash_id += FLASH_28F128J3A;
 334                 info->sector_count = 128;
 335                 info->size = 0x01000000 * 2;
 336                 break;                          /* => 32 MB             */
 337
 338         default:
 339                 info->flash_id = FLASH_UNKNOWN;
 340                 addr[0] = 0x00FF00FF;           /* restore read mode */
 341                 return (0);                     /* => no or unknown flash */
 342
 343         }
 344
 345         if (info->sector_count > CFG_MAX_FLASH_SECT) {
 346                 printf ("** ERROR: sector count %d > max (%d) **\n",
 347                         info->sector_count, CFG_MAX_FLASH_SECT);
 348                 info->sector_count = CFG_MAX_FLASH_SECT;
 349         }
 350
 351         addr[0] = 0x00FF00FF;           /* restore read mode */
 352
 353         return (info->size);
 354 }
 355
 356
 357 /*-----------------------------------------------------------------------
 358  */
 359
 360 int     flash_erase (flash_info_t *info, int s_first, int s_last)
 361 {
 362         int flag, prot, sect;
 363         ulong start, now, last;
 364
 365         debug ("flash_erase: first: %d last: %d\n", s_first, s_last);
 366
 367         if ((s_first < 0) || (s_first > s_last)) {
 368                 if (info->flash_id == FLASH_UNKNOWN) {
 369                         printf ("- missing\n");
 370                 } else {
 371                         printf ("- no sectors to erase\n");
 372                 }
 373                 return 1;
 374         }
 375
 376         if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL) {
 377                 printf ("Can erase only Intel flash types - aborted\n");
 378                 return 1;
 379         }
 380
 381         prot = 0;
 382         for (sect=s_first; sect<=s_last; ++sect) {
 383                 if (info->protect[sect]) {
 384                         prot++;
 385                 }
 386         }
 387
 388         if (prot) {
 389                 printf ("- Warning: %d protected sectors will not be erased!\n",
 390                         prot);
 391         } else {
 392                 printf ("\n");
 393         }
 394
 395         start = get_timer (0);
 396         last  = start;
 397         /* Start erase on unprotected sectors */
 398         for (sect = s_first; sect<=s_last; sect++) {
 399                 if (info->protect[sect] == 0) { /* not protected */
 400                         vu_long *addr = (vu_long *)(info->start[sect]);
 401                         unsigned long status;
 402
 403                         /* Disable interrupts which might cause a timeout here */
 404                         flag = disable_interrupts();
 405
 406                         *addr = 0x00600060;     /* clear lock bit setup */
 407                         *addr = 0x00D000D0;     /* clear lock bit confirm */
 408
 409                         udelay (1000);
 410                         /* This takes awfully long - up to 50 ms and more */
 411                         while (((status = *addr) & 0x00800080) != 0x00800080) {
 412                                 if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 413                                         printf ("Timeout\n");
 414                                         *addr = 0x00FF00FF; /* reset to read mode */
 415                                         return 1;
 416                                 }
 417
 418                                 /* show that we're waiting */
 419                                 if ((now - last) > 1000) {      /* every second */
 420                                         putc ('.');
 421                                         last = now;
 422                                 }
 423                                 udelay (1000);  /* to trigger the watchdog */
 424                         }
 425
 426                         *addr = 0x00500050;     /* clear status register */
 427                         *addr = 0x00200020;     /* erase setup */
 428                         *addr = 0x00D000D0;     /* erase confirm */
 429
 430                         /* re-enable interrupts if necessary */
 431                         if (flag)
 432                                 enable_interrupts();
 433
 434                         /* wait at least 80us - let's wait 1 ms */
 435                         udelay (1000);
 436
 437                         while (((status = *addr) & 0x00800080) != 0x00800080) {
 438                                 if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 439                                         printf ("Timeout\n");
 440                                         *addr = 0x00B000B0; /* suspend erase      */
 441                                         *addr = 0x00FF00FF; /* reset to read mode */
 442                                         return 1;
 443                                 }
 444
 445                                 /* show that we're waiting */
 446                                 if ((now - last) > 1000) {      /* every second */
 447                                         putc ('.');
 448                                         last = now;
 449                                 }
 450                                 udelay (1000);  /* to trigger the watchdog */
 451                         }
 452
 453                         *addr = 0x00FF00FF;     /* reset to read mode */
 454                 }
 455         }
 456         printf (" done\n");
 457         return 0;
 458 }
 459
 460 /*-----------------------------------------------------------------------
 461  * Copy memory to flash, returns:
 462  * 0 - OK
 463  * 1 - write timeout
 464  * 2 - Flash not erased
 465  * 4 - Flash not identified
 466  */
 467
 468 #define FLASH_WIDTH     4       /* flash bus width in bytes */
 469
 470 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 471 {
 472         ulong cp, wp, data;
 473         int i, l, rc;
 474
 475         if (info->flash_id == FLASH_UNKNOWN) {
 476                 return 4;
 477         }
 478
 479         wp = (addr & ~(FLASH_WIDTH-1)); /* get lower FLASH_WIDTH aligned address */
 480
 481         /*
 482          * handle unaligned start bytes
 483          */
 484         if ((l = addr - wp) != 0) {
 485                 data = 0;
 486                 for (i=0, cp=wp; i<l; ++i, ++cp) {
 487                         data = (data << 8) | (*(uchar *)cp);
 488                 }
 489                 for (; i<FLASH_WIDTH && cnt>0; ++i) {
 490                         data = (data << 8) | *src++;
 491                         --cnt;
 492                         ++cp;
 493                 }
 494                 for (; cnt==0 && i<FLASH_WIDTH; ++i, ++cp) {
 495                         data = (data << 8) | (*(uchar *)cp);
 496                 }
 497
 498                 if ((rc = write_data(info, wp, data)) != 0) {
 499                         return (rc);
 500                 }
 501                 wp += FLASH_WIDTH;
 502         }
 503
 504         /*
 505          * handle FLASH_WIDTH aligned part
 506          */
 507 #ifdef CFG_FLASH_USE_BUFFER_WRITE
 508         while(cnt >= FLASH_WIDTH) {
 509                 i = CFG_FLASH_BUFFER_SIZE > cnt ?
 510                     (cnt & ~(FLASH_WIDTH - 1)) : CFG_FLASH_BUFFER_SIZE;
 511                 if((rc = write_data_buf(info, wp, src,i)) != 0)
 512                         return rc;
 513                 wp += i;
 514                 src += i;
 515                 cnt -=i;
 516         }
 517 #else
 518         while (cnt >= FLASH_WIDTH) {
 519                 data = 0;
 520                 for (i=0; i<FLASH_WIDTH; ++i) {
 521                         data = (data << 8) | *src++;
 522                 }
 523                 if ((rc = write_data(info, wp, data)) != 0) {
 524                         return (rc);
 525                 }
 526                 wp  += FLASH_WIDTH;
 527                 cnt -= FLASH_WIDTH;
 528         }
 529 #endif /* CFG_FLASH_USE_BUFFER_WRITE */
 530
 531         if (cnt == 0) {
 532                 return (0);
 533         }
 534
 535         /*
 536          * handle unaligned tail bytes
 537          */
 538         data = 0;
 539         for (i=0, cp=wp; i<FLASH_WIDTH && cnt>0; ++i, ++cp) {
 540                 data = (data << 8) | *src++;
 541                 --cnt;
 542         }
 543         for (; i<FLASH_WIDTH; ++i, ++cp) {
 544                 data = (data << 8) | (*(uchar *)cp);
 545         }
 546
 547         return (write_data(info, wp, data));
 548 }
 549
 550 /*-----------------------------------------------------------------------
 551  * Check flash status, returns:
 552  * 0 - OK
 553  * 1 - timeout
 554  */
 555 static int flash_status_check(vu_long *addr, ulong tout, char * prompt)
 556 {
 557         ulong status;
 558         ulong start;
 559
 560         /* Wait for command completion */
 561         start = get_timer (0);
 562         while(((status = *addr) & 0x00800080) != 0x00800080) {
 563                 if (get_timer(start) > tout) {
 564                         printf("Flash %s timeout at address %p\n", prompt, addr);
 565                         *addr = 0x00FF00FF;     /* restore read mode */
 566                         return (1);
 567                 }
 568         }
 569         return 0;
 570 }
 571
 572 /*-----------------------------------------------------------------------
 573  * Write a word to Flash, returns:
 574  * 0 - OK
 575  * 1 - write timeout
 576  * 2 - Flash not erased
 577  */
 578 static int write_data (flash_info_t *info, ulong dest, ulong data)
 579 {
 580         vu_long *addr = (vu_long *)dest;
 581         int flag;
 582
 583         /* Check if Flash is (sufficiently) erased */
 584         if ((*addr & data) != data) {
 585                 return (2);
 586         }
 587         /* Disable interrupts which might cause a timeout here */
 588         flag = disable_interrupts();
 589
 590         *addr = 0x00400040;             /* write setup */
 591         *addr = data;
 592
 593         /* re-enable interrupts if necessary */
 594         if (flag)
 595                 enable_interrupts();
 596
 597         if (flash_status_check(addr, CFG_FLASH_WRITE_TOUT, "write") != 0) {
 598                 return (1);
 599         }
 600
 601         *addr = 0x00FF00FF;     /* restore read mode */
 602
 603         return (0);
 604 }
 605
 606 #ifdef CFG_FLASH_USE_BUFFER_WRITE
 607 /*-----------------------------------------------------------------------
 608  * Write a buffer to Flash, returns:
 609  * 0 - OK
 610  * 1 - write timeout
 611  */
 612 static int write_data_buf(flash_info_t * info, ulong dest, uchar * cp, int len)
 613 {
 614         vu_long *addr = (vu_long *)dest;
 615         int sector;
 616         int cnt;
 617         int retcode;
 618         vu_long * src = (vu_long *)cp;
 619         vu_long * dst = (vu_long *)dest;
 620
 621         /* find sector */
 622         for(sector = info->sector_count - 1; sector >= 0; sector--) {
 623                 if(dest >= info->start[sector])
 624                         break;
 625         }
 626
 627         *addr = 0x00500050;             /* clear status */
 628         *addr = 0x00e800e8;             /* write buffer */
 629
 630         if((retcode = flash_status_check(addr, CFG_FLASH_BUFFER_WRITE_TOUT,
 631                                          "write to buffer")) == 0) {
 632                 cnt = len / FLASH_WIDTH;
 633                 *addr = (cnt-1) | ((cnt-1) << 16);
 634                 while(cnt-- > 0) {
 635                         *dst++ = *src++;
 636                 }
 637                 *addr = 0x00d000d0;             /* write buffer confirm */
 638                 retcode = flash_status_check(addr, CFG_FLASH_BUFFER_WRITE_TOUT,
 639                                                  "buffer write");
 640         }
 641         *addr = 0x00FF00FF;     /* restore read mode */
 642         *addr = 0x00500050;     /* clear status */
 643         return retcode;
 644 }
 645 #endif /* CFG_USE_FLASH_BUFFER_WRITE */
 646
 647 /*-----------------------------------------------------------------------
 648  */