board/ocotea/flash.c

   1 /*
   2  * (C) Copyright 2004-2005
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2002 Jun Gu <jung@artesyncp.com>
   6  * Add support for Am29F016D and dynamic switch setting.
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 /*
  28  * Modified 4/5/2001
  29  * Wait for completion of each sector erase command issued
  30  * 4/5/2001
  31  * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
  32  */
  33
  34 #include <common.h>
  35 #include <ppc4xx.h>
  36 #include <asm/processor.h>
  37
  38 #undef DEBUG
  39
  40 #ifdef DEBUG
  41 #define DEBUGF(x...) printf(x)
  42 #else
  43 #define DEBUGF(x...)
  44 #endif                          /* DEBUG */
  45
  46 #define     BOOT_SMALL_FLASH        0x40 /* 01000000 */
  47 #define     FLASH_ONBD_N            2   /* 00000010 */
  48 #define     FLASH_SRAM_SEL          1   /* 00000001 */
  49 #define     FLASH_ONBD_N            2   /* 00000010 */
  50 #define     FLASH_SRAM_SEL          1   /* 00000001 */
  51
  52 #define     BOOT_SMALL_FLASH_VAL    4
  53 #define     FLASH_ONBD_N_VAL        2
  54 #define     FLASH_SRAM_SEL_VAL      1
  55
  56
  57 flash_info_t flash_info[CFG_MAX_FLASH_BANKS];   /* info for FLASH chips        */
  58
  59 static unsigned long flash_addr_table[8][CFG_MAX_FLASH_BANKS] = {
  60         {0xFF800000, 0xFF880000, 0xFFC00000},   /* 0:000: configuraton 4 */
  61         {0xFF900000, 0xFF980000, 0xFFC00000},   /* 1:001: configuraton 3 */
  62         {0x00000000, 0x00000000, 0x00000000},   /* 2:010: configuraton 8 */
  63         {0x00000000, 0x00000000, 0x00000000},   /* 3:011: configuraton 7 */
  64         {0xFFE00000, 0xFFF00000, 0xFF800000},   /* 4:100: configuraton 2 */
  65         {0xFFF00000, 0xFFF80000, 0xFF800000},   /* 5:101: configuraton 1 */
  66         {0x00000000, 0x00000000, 0x00000000},   /* 6:110: configuraton 6 */
  67         {0x00000000, 0x00000000, 0x00000000}    /* 7:111: configuraton 5 */
  68 };
  69
  70 /*-----------------------------------------------------------------------
  71  * Functions
  72  */
  73 static ulong flash_get_size(vu_long * addr, flash_info_t * info);
  74 static int write_word(flash_info_t * info, ulong dest, ulong data);
  75
  76
  77 #ifdef CONFIG_OCOTEA
  78 #define ADDR0           0x5555
  79 #define ADDR1           0x2aaa
  80 #define FLASH_WORD_SIZE unsigned char
  81 #endif
  82
  83 /*-----------------------------------------------------------------------
  84  */
  85
  86 unsigned long flash_init(void)
  87 {
  88         unsigned long total_b = 0;
  89         unsigned long size_b[CFG_MAX_FLASH_BANKS];
  90         unsigned char *fpga_base = (unsigned char *) CFG_FPGA_BASE;
  91         unsigned char switch_status;
  92         unsigned short index = 0;
  93         int i;
  94
  95         /* read FPGA base register FPGA_REG0 */
  96         switch_status = *fpga_base;
  97
  98         /* check the bitmap of switch status */
  99         if (switch_status & BOOT_SMALL_FLASH) {
 100                 index += BOOT_SMALL_FLASH_VAL;
 101         }
 102         if (switch_status & FLASH_ONBD_N) {
 103                 index += FLASH_ONBD_N_VAL;
 104         }
 105         if (switch_status & FLASH_SRAM_SEL) {
 106                 index += FLASH_SRAM_SEL_VAL;
 107         }
 108
 109         DEBUGF("\n");
 110         DEBUGF("FLASH: Index: %d\n", index);
 111
 112         /* Init: no FLASHes known */
 113         for (i = 0; i < CFG_MAX_FLASH_BANKS; ++i) {
 114                 flash_info[i].flash_id = FLASH_UNKNOWN;
 115                 flash_info[i].sector_count = -1;
 116                 flash_info[i].size = 0;
 117
 118                 /* check whether the address is 0 */
 119                 if (flash_addr_table[index][i] == 0) {
 120                         continue;
 121                 }
 122
 123                 /* call flash_get_size() to initialize sector address */
 124                 size_b[i] = flash_get_size((vu_long *) flash_addr_table[index][i], &flash_info[i]);
 125                 flash_info[i].size = size_b[i];
 126                 if (flash_info[i].flash_id == FLASH_UNKNOWN) {
 127                         printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",
 128                                 i, size_b[i], size_b[i] << 20);
 129                         flash_info[i].sector_count = -1;
 130                         flash_info[i].size = 0;
 131                 }
 132
 133                 total_b += flash_info[i].size;
 134         }
 135
 136         /* Monitor protection ON by default */
 137         (void)flash_protect(FLAG_PROTECT_SET,
 138                             -CFG_MONITOR_LEN,
 139                             0xffffffff,
 140                             &flash_info[2]);
 141
 142         return total_b;
 143 }
 144
 145 /*-----------------------------------------------------------------------
 146  */
 147 void flash_print_info(flash_info_t * info)
 148 {
 149         int i;
 150         int k;
 151         int size;
 152         int erased;
 153         volatile unsigned long *flash;
 154
 155         if (info->flash_id == FLASH_UNKNOWN) {
 156                 printf("missing or unknown FLASH type\n");
 157                 return;
 158         }
 159
 160         switch (info->flash_id & FLASH_VENDMASK) {
 161         case FLASH_MAN_AMD:
 162                 printf("AMD ");
 163                 break;
 164         case FLASH_MAN_STM:
 165                 printf("STM ");
 166                 break;
 167         case FLASH_MAN_FUJ:
 168                 printf("FUJITSU ");
 169                 break;
 170         case FLASH_MAN_SST:
 171                 printf("SST ");
 172                 break;
 173         default:
 174                 printf("Unknown Vendor ");
 175                 break;
 176         }
 177
 178         switch (info->flash_id & FLASH_TYPEMASK) {
 179         case FLASH_AM040:
 180                 printf("AM29F040 (512 Kbit, uniform sector size)\n");
 181                 break;
 182         case FLASH_AM400B:
 183                 printf("AM29LV400B (4 Mbit, bottom boot sect)\n");
 184                 break;
 185         case FLASH_AM400T:
 186                 printf("AM29LV400T (4 Mbit, top boot sector)\n");
 187                 break;
 188         case FLASH_AM800B:
 189                 printf("AM29LV800B (8 Mbit, bottom boot sect)\n");
 190                 break;
 191         case FLASH_AM800T:
 192                 printf("AM29LV800T (8 Mbit, top boot sector)\n");
 193                 break;
 194         case FLASH_AM160B:
 195                 printf("AM29LV160B (16 Mbit, bottom boot sect)\n");
 196                 break;
 197         case FLASH_AM160T:
 198                 printf("AM29LV160T (16 Mbit, top boot sector)\n");
 199                 break;
 200         case FLASH_AM320B:
 201                 printf("AM29LV320B (32 Mbit, bottom boot sect)\n");
 202                 break;
 203         case FLASH_AM320T:
 204                 printf("AM29LV320T (32 Mbit, top boot sector)\n");
 205                 break;
 206         case FLASH_AMDLV033C:
 207                 printf("AM29LV033C (32 Mbit, top boot sector)\n");
 208                 break;
 209         case FLASH_SST800A:
 210                 printf("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
 211                 break;
 212         case FLASH_SST160A:
 213                 printf("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
 214                 break;
 215         default:
 216                 printf("Unknown Chip Type\n");
 217                 break;
 218         }
 219
 220         printf("  Size: %ld KB in %d Sectors\n",
 221                info->size >> 10, info->sector_count);
 222
 223         printf("  Sector Start Addresses:");
 224         for (i = 0; i < info->sector_count; ++i) {
 225                 /*
 226                  * Check if whole sector is erased
 227                  */
 228                 if (i != (info->sector_count - 1))
 229                         size = info->start[i + 1] - info->start[i];
 230                 else
 231                         size = info->start[0] + info->size - info->start[i];
 232                 erased = 1;
 233                 flash = (volatile unsigned long *) info->start[i];
 234                 size = size >> 2;       /* divide by 4 for longword access */
 235                 for (k = 0; k < size; k++) {
 236                         if (*flash++ != 0xffffffff) {
 237                                 erased = 0;
 238                                 break;
 239                         }
 240                 }
 241
 242                 if ((i % 5) == 0)
 243                         printf("\n   ");
 244                 printf(" %08lX%s%s",
 245                        info->start[i],
 246                        erased ? " E" : "  ", info->protect[i] ? "RO " : "   ");
 247         }
 248         printf("\n");
 249         return;
 250 }
 251
 252 /*-----------------------------------------------------------------------
 253  */
 254
 255 /*
 256  * The following code cannot be run from FLASH!
 257  */
 258 static ulong flash_get_size(vu_long * addr, flash_info_t * info)
 259 {
 260         short i;
 261         FLASH_WORD_SIZE value;
 262         ulong base = (ulong) addr;
 263         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) addr;
 264
 265         DEBUGF("FLASH ADDR: %08x\n", (unsigned) addr);
 266
 267         /* Write auto select command: read Manufacturer ID */
 268         udelay(10000);
 269         addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 270         udelay(1000);
 271         addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 272         udelay(1000);
 273         addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00900090;
 274         udelay(1000);
 275
 276         value = addr2[0];
 277         DEBUGF("FLASH MANUFACT: %x\n", value);
 278
 279         switch (value) {
 280         case (FLASH_WORD_SIZE) AMD_MANUFACT:
 281                 info->flash_id = FLASH_MAN_AMD;
 282                 break;
 283         case (FLASH_WORD_SIZE) FUJ_MANUFACT:
 284                 info->flash_id = FLASH_MAN_FUJ;
 285                 break;
 286         case (FLASH_WORD_SIZE) SST_MANUFACT:
 287                 info->flash_id = FLASH_MAN_SST;
 288                 break;
 289         case (FLASH_WORD_SIZE) STM_MANUFACT:
 290                 info->flash_id = FLASH_MAN_STM;
 291                 break;
 292         default:
 293                 info->flash_id = FLASH_UNKNOWN;
 294                 info->sector_count = 0;
 295                 info->size = 0;
 296                 return (0);             /* no or unknown flash  */
 297         }
 298
 299         value = addr2[1];               /* device ID            */
 300
 301         DEBUGF("\nFLASH DEVICEID: %x\n", value);
 302
 303         switch (value) {
 304         case (FLASH_WORD_SIZE) AMD_ID_LV040B:
 305                 info->flash_id += FLASH_AM040;
 306                 info->sector_count = 8;
 307                 info->size = 0x0080000; /* => 512 ko */
 308                 break;
 309         case (FLASH_WORD_SIZE) AMD_ID_F040B:
 310                 info->flash_id += FLASH_AM040;
 311                 info->sector_count = 8;
 312                 info->size = 0x0080000; /* => 512 ko */
 313                 break;
 314         case (FLASH_WORD_SIZE) STM_ID_M29W040B:
 315                 info->flash_id += FLASH_AM040;
 316                 info->sector_count = 8;
 317                 info->size = 0x0080000; /* => 512 ko */
 318                 break;
 319         case (FLASH_WORD_SIZE) AMD_ID_LV033C:
 320                 info->flash_id += FLASH_AMDLV033C;
 321                 info->sector_count = 64;
 322                 info->size = 0x00400000;
 323                 break;                  /* => 4 MB              */
 324         default:
 325                 info->flash_id = FLASH_UNKNOWN;
 326                 return (0);             /* => no or unknown flash */
 327         }
 328
 329         /* set up sector start address table */
 330         if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 331             ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) ||
 332             ((info->flash_id & FLASH_TYPEMASK) == FLASH_AMD016)) {
 333                 for (i = 0; i < info->sector_count; i++)
 334                         info->start[i] = base + (i * 0x00010000);
 335         } else {
 336                 if (info->flash_id & FLASH_BTYPE) {
 337                         /* set sector offsets for bottom boot block type        */
 338                         info->start[0] = base + 0x00000000;
 339                         info->start[1] = base + 0x00004000;
 340                         info->start[2] = base + 0x00006000;
 341                         info->start[3] = base + 0x00008000;
 342                         for (i = 4; i < info->sector_count; i++) {
 343                                 info->start[i] = base + (i * 0x00010000) - 0x00030000;
 344                         }
 345                 } else {
 346                         /* set sector offsets for top boot block type           */
 347                         i = info->sector_count - 1;
 348                         info->start[i--] = base + info->size - 0x00004000;
 349                         info->start[i--] = base + info->size - 0x00006000;
 350                         info->start[i--] = base + info->size - 0x00008000;
 351                         for (; i >= 0; i--) {
 352                                 info->start[i] = base + i * 0x00010000;
 353                         }
 354                 }
 355         }
 356
 357         /* check for protected sectors */
 358         for (i = 0; i < info->sector_count; i++) {
 359                 /* read sector protection at sector address, (A7 .. A0) = 0x02 */
 360                 /* D0 = 1 if protected */
 361                 addr2 = (volatile FLASH_WORD_SIZE *) (info->start[i]);
 362
 363                 /* For AMD29033C flash we need to resend the command of *
 364                  * reading flash protection for upper 8 Mb of flash     */
 365                 if ( i == 32 ) {
 366                         addr2[ADDR0] = (FLASH_WORD_SIZE) 0xAAAAAAAA;
 367                         addr2[ADDR1] = (FLASH_WORD_SIZE) 0x55555555;
 368                         addr2[ADDR0] = (FLASH_WORD_SIZE) 0x90909090;
 369                 }
 370
 371                 if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
 372                         info->protect[i] = 0;
 373                 else
 374                         info->protect[i] = addr2[2] & 1;
 375         }
 376
 377         /* issue bank reset to return to read mode */
 378         addr2[0] = (FLASH_WORD_SIZE) 0x00F000F0;
 379
 380         /*
 381          * Prevent writes to uninitialized FLASH.
 382          */
 383         if (info->flash_id != FLASH_UNKNOWN) {
 384                 /* ? ? ? */
 385         }
 386
 387         return (info->size);
 388 }
 389
 390 int wait_for_DQ7(flash_info_t * info, int sect)
 391 {
 392         ulong start, now, last;
 393         volatile FLASH_WORD_SIZE *addr =
 394                 (FLASH_WORD_SIZE *) (info->start[sect]);
 395
 396         start = get_timer(0);
 397         last = start;
 398         while ((addr[0] & (FLASH_WORD_SIZE) 0x00800080) !=
 399                (FLASH_WORD_SIZE) 0x00800080) {
 400                 if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 401                         printf("Timeout\n");
 402                         return -1;
 403                 }
 404                 /* show that we're waiting */
 405                 if ((now - last) > 1000) {      /* every second */
 406                         putc('.');
 407                         last = now;
 408                 }
 409         }
 410         return 0;
 411 }
 412
 413 /*-----------------------------------------------------------------------
 414  */
 415
 416 int flash_erase(flash_info_t * info, int s_first, int s_last)
 417 {
 418         volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *) (info->start[0]);
 419         volatile FLASH_WORD_SIZE *addr2;
 420         int flag, prot, sect, l_sect;
 421         int i;
 422
 423         if ((s_first < 0) || (s_first > s_last)) {
 424                 if (info->flash_id == FLASH_UNKNOWN) {
 425                         printf("- missing\n");
 426                 } else {
 427                         printf("- no sectors to erase\n");
 428                 }
 429                 return 1;
 430         }
 431
 432         if (info->flash_id == FLASH_UNKNOWN) {
 433                 printf("Can't erase unknown flash type - aborted\n");
 434                 return 1;
 435         }
 436
 437         prot = 0;
 438         for (sect = s_first; sect <= s_last; ++sect) {
 439                 if (info->protect[sect]) {
 440                         prot++;
 441                 }
 442         }
 443
 444         if (prot) {
 445                 printf("- Warning: %d protected sectors will not be erased!\n",
 446                        prot);
 447         } else {
 448                 printf("\n");
 449         }
 450
 451         l_sect = -1;
 452
 453         /* Disable interrupts which might cause a timeout here */
 454         flag = disable_interrupts();
 455
 456         /* Start erase on unprotected sectors */
 457         for (sect = s_first; sect <= s_last; sect++) {
 458                 if (info->protect[sect] == 0) { /* not protected */
 459                         addr2 = (FLASH_WORD_SIZE *) (info->start[sect]);
 460
 461                         if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 462                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 463                                 addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 464                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
 465                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 466                                 addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 467                                 addr2[0] = (FLASH_WORD_SIZE) 0x00500050;        /* block erase */
 468                                 for (i = 0; i < 50; i++)
 469                                         udelay(1000);   /* wait 1 ms */
 470                         } else {
 471                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 472                                 addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 473                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
 474                                 addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 475                                 addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 476                                 addr2[0] = (FLASH_WORD_SIZE) 0x00300030;        /* sector erase */
 477                         }
 478                         l_sect = sect;
 479                         /*
 480                          * Wait for each sector to complete, it's more
 481                          * reliable.  According to AMD Spec, you must
 482                          * issue all erase commands within a specified
 483                          * timeout.  This has been seen to fail, especially
 484                          * if printf()s are included (for debug)!!
 485                          */
 486                         wait_for_DQ7(info, sect);
 487                 }
 488         }
 489
 490         /* re-enable interrupts if necessary */
 491         if (flag)
 492                 enable_interrupts();
 493
 494         /* wait at least 80us - let's wait 1 ms */
 495         udelay(1000);
 496
 497         /* reset to read mode */
 498         addr = (FLASH_WORD_SIZE *) info->start[0];
 499         addr[0] = (FLASH_WORD_SIZE) 0x00F000F0; /* reset bank */
 500
 501         printf(" done\n");
 502         return 0;
 503 }
 504
 505 /*-----------------------------------------------------------------------
 506  * Copy memory to flash, returns:
 507  * 0 - OK
 508  * 1 - write timeout
 509  * 2 - Flash not erased
 510  */
 511 int write_buff(flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 512 {
 513         ulong cp, wp, data;
 514         int i, l, rc;
 515
 516         wp = (addr & ~3);               /* get lower word aligned address */
 517
 518         /*
 519          * handle unaligned start bytes
 520          */
 521         if ((l = addr - wp) != 0) {
 522                 data = 0;
 523             for (i = 0, cp = wp; i < l; ++i, ++cp) {
 524                     data = (data << 8) | (*(uchar *) cp);
 525             }
 526             for (; i < 4 && cnt > 0; ++i) {
 527                     data = (data << 8) | *src++;
 528                     --cnt;
 529                     ++cp;
 530             }
 531             for (; cnt == 0 && i < 4; ++i, ++cp) {
 532                     data = (data << 8) | (*(uchar *) cp);
 533             }
 534
 535             if ((rc = write_word(info, wp, data)) != 0) {
 536                     return (rc);
 537             }
 538             wp += 4;
 539         }
 540
 541         /*
 542          * handle word aligned part
 543          */
 544         while (cnt >= 4) {
 545                 data = 0;
 546                 for (i = 0; i < 4; ++i) {
 547                         data = (data << 8) | *src++;
 548                 }
 549                 if ((rc = write_word(info, wp, data)) != 0) {
 550                         return (rc);
 551                 }
 552                 wp += 4;
 553                 cnt -= 4;
 554         }
 555
 556         if (cnt == 0) {
 557                 return (0);
 558         }
 559
 560         /*
 561          * handle unaligned tail bytes
 562          */
 563         data = 0;
 564         for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
 565                 data = (data << 8) | *src++;
 566                 --cnt;
 567         }
 568         for (; i < 4; ++i, ++cp) {
 569                 data = (data << 8) | (*(uchar *) cp);
 570         }
 571
 572         return (write_word(info, wp, data));
 573 }
 574
 575 /*-----------------------------------------------------------------------
 576  * Write a word to Flash, returns:
 577  * 0 - OK
 578  * 1 - write timeout
 579  * 2 - Flash not erased
 580  */
 581 static int write_word(flash_info_t * info, ulong dest, ulong data)
 582 {
 583         volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) (info->start[0]);
 584         volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *) dest;
 585         volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
 586         ulong start;
 587         int i;
 588
 589         /* Check if Flash is (sufficiently) erased */
 590         if ((*((volatile FLASH_WORD_SIZE *) dest) &
 591              (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
 592                 return (2);
 593         }
 594
 595         for (i = 0; i < 4 / sizeof(FLASH_WORD_SIZE); i++) {
 596                 int flag;
 597
 598                 /* Disable interrupts which might cause a timeout here */
 599                 flag = disable_interrupts();
 600
 601                 addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 602                 addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 603                 addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;
 604
 605                 dest2[i] = data2[i];
 606
 607                 /* re-enable interrupts if necessary */
 608                 if (flag)
 609                         enable_interrupts();
 610
 611                 /* data polling for D7 */
 612                 start = get_timer(0);
 613                 while ((dest2[i] & (FLASH_WORD_SIZE) 0x00800080) !=
 614                        (data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {
 615
 616                         if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 617                                 return (1);
 618                         }
 619                 }
 620         }
 621
 622         return (0);
 623 }