hw/pflash_cfi02.c

   1 /*
   2  *  CFI parallel flash with AMD command set emulation
   3  *
   4  *  Copyright (c) 2005 Jocelyn Mayer
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /*
  21  * For now, this code can emulate flashes of 1, 2 or 4 bytes width.
  22  * Supported commands/modes are:
  23  * - flash read
  24  * - flash write
  25  * - flash ID read
  26  * - sector erase
  27  * - chip erase
  28  * - unlock bypass command
  29  * - CFI queries
  30  *
  31  * It does not support flash interleaving.
  32  * It does not implement boot blocs with reduced size
  33  * It does not implement software data protection as found in many real chips
  34  * It does not implement erase suspend/resume commands
  35  * It does not implement multiple sectors erase
  36  */
  37
  38 #include "hw.h"
  39 #include "flash.h"
  40 #include "qemu-timer.h"
  41 #include "block.h"
  42
  43 //#define PFLASH_DEBUG
  44 #ifdef PFLASH_DEBUG
  45 #define DPRINTF(fmt, ...)                          \
  46 do {                                               \
  47     printf("PFLASH: " fmt , ## __VA_ARGS__);       \
  48 } while (0)
  49 #else
  50 #define DPRINTF(fmt, ...) do { } while (0)
  51 #endif
  52
  53 struct pflash_t {
  54     BlockDriverState *bs;
  55     target_phys_addr_t base;
  56     uint32_t sector_len;
  57     uint32_t chip_len;
  58     int mappings;
  59     int width;
  60     int wcycle; /* if 0, the flash is read normally */
  61     int bypass;
  62     int ro;
  63     uint8_t cmd;
  64     uint8_t status;
  65     uint16_t ident[4];
  66     uint16_t unlock_addr[2];
  67     uint8_t cfi_len;
  68     uint8_t cfi_table[0x52];
  69     QEMUTimer *timer;
  70     ram_addr_t off;
  71     int fl_mem;
  72     int rom_mode;
  73     void *storage;
  74 };
  75
  76 static void pflash_register_memory(pflash_t *pfl, int rom_mode)
  77 {
  78     unsigned long phys_offset = pfl->fl_mem;
  79     int i;
  80
  81     if (rom_mode)
  82         phys_offset |= pfl->off | IO_MEM_ROMD;
  83     pfl->rom_mode = rom_mode;
  84
  85     for (i = 0; i < pfl->mappings; i++)
  86         cpu_register_physical_memory(pfl->base + i * pfl->chip_len,
  87                                      pfl->chip_len, phys_offset);
  88 }
  89
  90 static void pflash_timer (void *opaque)
  91 {
  92     pflash_t *pfl = opaque;
  93
  94     DPRINTF("%s: command %02x done\n", __func__, pfl->cmd);
  95     /* Reset flash */
  96     pfl->status ^= 0x80;
  97     if (pfl->bypass) {
  98         pfl->wcycle = 2;
  99     } else {
 100         pflash_register_memory(pfl, 1);
 101         pfl->wcycle = 0;
 102     }
 103     pfl->cmd = 0;
 104 }
 105
 106 static uint32_t pflash_read (pflash_t *pfl, uint32_t offset, int width)
 107 {
 108     uint32_t boff;
 109     uint32_t ret;
 110     uint8_t *p;
 111
 112     DPRINTF("%s: offset " TARGET_FMT_lx "\n", __func__, offset);
 113     ret = -1;
 114     if (pfl->rom_mode) {
 115         /* Lazy reset of to ROMD mode */
 116         if (pfl->wcycle == 0)
 117             pflash_register_memory(pfl, 1);
 118     }
 119     offset &= pfl->chip_len - 1;
 120     boff = offset & 0xFF;
 121     if (pfl->width == 2)
 122         boff = boff >> 1;
 123     else if (pfl->width == 4)
 124         boff = boff >> 2;
 125     switch (pfl->cmd) {
 126     default:
 127         /* This should never happen : reset state & treat it as a read*/
 128         DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
 129         pfl->wcycle = 0;
 130         pfl->cmd = 0;
 131     case 0x80:
 132         /* We accept reads during second unlock sequence... */
 133     case 0x00:
 134     flash_read:
 135         /* Flash area read */
 136         p = pfl->storage;
 137         switch (width) {
 138         case 1:
 139             ret = p[offset];
 140 //            DPRINTF("%s: data offset %08x %02x\n", __func__, offset, ret);
 141             break;
 142         case 2:
 143 #if defined(TARGET_WORDS_BIGENDIAN)
 144             ret = p[offset] << 8;
 145             ret |= p[offset + 1];
 146 #else
 147             ret = p[offset];
 148             ret |= p[offset + 1] << 8;
 149 #endif
 150 //            DPRINTF("%s: data offset %08x %04x\n", __func__, offset, ret);
 151             break;
 152         case 4:
 153 #if defined(TARGET_WORDS_BIGENDIAN)
 154             ret = p[offset] << 24;
 155             ret |= p[offset + 1] << 16;
 156             ret |= p[offset + 2] << 8;
 157             ret |= p[offset + 3];
 158 #else
 159             ret = p[offset];
 160             ret |= p[offset + 1] << 8;
 161             ret |= p[offset + 2] << 16;
 162             ret |= p[offset + 3] << 24;
 163 #endif
 164 //            DPRINTF("%s: data offset %08x %08x\n", __func__, offset, ret);
 165             break;
 166         }
 167         break;
 168     case 0x90:
 169         /* flash ID read */
 170         switch (boff) {
 171         case 0x00:
 172         case 0x01:
 173             ret = pfl->ident[boff & 0x01];
 174             break;
 175         case 0x02:
 176             ret = 0x00; /* Pretend all sectors are unprotected */
 177             break;
 178         case 0x0E:
 179         case 0x0F:
 180             if (pfl->ident[2 + (boff & 0x01)] == (uint8_t)-1)
 181                 goto flash_read;
 182             ret = pfl->ident[2 + (boff & 0x01)];
 183             break;
 184         default:
 185             goto flash_read;
 186         }
 187         DPRINTF("%s: ID " TARGET_FMT_ld " %x\n", __func__, boff, ret);
 188         break;
 189     case 0xA0:
 190     case 0x10:
 191     case 0x30:
 192         /* Status register read */
 193         ret = pfl->status;
 194         DPRINTF("%s: status %x\n", __func__, ret);
 195         /* Toggle bit 6 */
 196         pfl->status ^= 0x40;
 197         break;
 198     case 0x98:
 199         /* CFI query mode */
 200         if (boff > pfl->cfi_len)
 201             ret = 0;
 202         else
 203             ret = pfl->cfi_table[boff];
 204         break;
 205     }
 206
 207     return ret;
 208 }
 209
 210 /* update flash content on disk */
 211 static void pflash_update(pflash_t *pfl, int offset,
 212                           int size)
 213 {
 214     int offset_end;
 215     if (pfl->bs) {
 216         offset_end = offset + size;
 217         /* round to sectors */
 218         offset = offset >> 9;
 219         offset_end = (offset_end + 511) >> 9;
 220         bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
 221                    offset_end - offset);
 222     }
 223 }
 224
 225 static void pflash_write (pflash_t *pfl, uint32_t offset, uint32_t value,
 226                           int width)
 227 {
 228     uint32_t boff;
 229     uint8_t *p;
 230     uint8_t cmd;
 231
 232     cmd = value;
 233     if (pfl->cmd != 0xA0 && cmd == 0xF0) {
 234 #if 0
 235         DPRINTF("%s: flash reset asked (%02x %02x)\n",
 236                 __func__, pfl->cmd, cmd);
 237 #endif
 238         goto reset_flash;
 239     }
 240     DPRINTF("%s: offset " TARGET_FMT_lx " %08x %d %d\n", __func__,
 241             offset, value, width, pfl->wcycle);
 242     offset &= pfl->chip_len - 1;
 243
 244     DPRINTF("%s: offset " TARGET_FMT_lx " %08x %d\n", __func__,
 245             offset, value, width);
 246     boff = offset & (pfl->sector_len - 1);
 247     if (pfl->width == 2)
 248         boff = boff >> 1;
 249     else if (pfl->width == 4)
 250         boff = boff >> 2;
 251     switch (pfl->wcycle) {
 252     case 0:
 253         /* Set the device in I/O access mode if required */
 254         if (pfl->rom_mode)
 255             pflash_register_memory(pfl, 0);
 256         /* We're in read mode */
 257     check_unlock0:
 258         if (boff == 0x55 && cmd == 0x98) {
 259         enter_CFI_mode:
 260             /* Enter CFI query mode */
 261             pfl->wcycle = 7;
 262             pfl->cmd = 0x98;
 263             return;
 264         }
 265         if (boff != pfl->unlock_addr[0] || cmd != 0xAA) {
 266             DPRINTF("%s: unlock0 failed " TARGET_FMT_lx " %02x %04x\n",
 267                     __func__, boff, cmd, pfl->unlock_addr[0]);
 268             goto reset_flash;
 269         }
 270         DPRINTF("%s: unlock sequence started\n", __func__);
 271         break;
 272     case 1:
 273         /* We started an unlock sequence */
 274     check_unlock1:
 275         if (boff != pfl->unlock_addr[1] || cmd != 0x55) {
 276             DPRINTF("%s: unlock1 failed " TARGET_FMT_lx " %02x\n", __func__,
 277                     boff, cmd);
 278             goto reset_flash;
 279         }
 280         DPRINTF("%s: unlock sequence done\n", __func__);
 281         break;
 282     case 2:
 283         /* We finished an unlock sequence */
 284         if (!pfl->bypass && boff != pfl->unlock_addr[0]) {
 285             DPRINTF("%s: command failed " TARGET_FMT_lx " %02x\n", __func__,
 286                     boff, cmd);
 287             goto reset_flash;
 288         }
 289         switch (cmd) {
 290         case 0x20:
 291             pfl->bypass = 1;
 292             goto do_bypass;
 293         case 0x80:
 294         case 0x90:
 295         case 0xA0:
 296             pfl->cmd = cmd;
 297             DPRINTF("%s: starting command %02x\n", __func__, cmd);
 298             break;
 299         default:
 300             DPRINTF("%s: unknown command %02x\n", __func__, cmd);
 301             goto reset_flash;
 302         }
 303         break;
 304     case 3:
 305         switch (pfl->cmd) {
 306         case 0x80:
 307             /* We need another unlock sequence */
 308             goto check_unlock0;
 309         case 0xA0:
 310             DPRINTF("%s: write data offset " TARGET_FMT_lx " %08x %d\n",
 311                     __func__, offset, value, width);
 312             p = pfl->storage;
 313             switch (width) {
 314             case 1:
 315                 p[offset] &= value;
 316                 pflash_update(pfl, offset, 1);
 317                 break;
 318             case 2:
 319 #if defined(TARGET_WORDS_BIGENDIAN)
 320                 p[offset] &= value >> 8;
 321                 p[offset + 1] &= value;
 322 #else
 323                 p[offset] &= value;
 324                 p[offset + 1] &= value >> 8;
 325 #endif
 326                 pflash_update(pfl, offset, 2);
 327                 break;
 328             case 4:
 329 #if defined(TARGET_WORDS_BIGENDIAN)
 330                 p[offset] &= value >> 24;
 331                 p[offset + 1] &= value >> 16;
 332                 p[offset + 2] &= value >> 8;
 333                 p[offset + 3] &= value;
 334 #else
 335                 p[offset] &= value;
 336                 p[offset + 1] &= value >> 8;
 337                 p[offset + 2] &= value >> 16;
 338                 p[offset + 3] &= value >> 24;
 339 #endif
 340                 pflash_update(pfl, offset, 4);
 341                 break;
 342             }
 343             pfl->status = 0x00 | ~(value & 0x80);
 344             /* Let's pretend write is immediate */
 345             if (pfl->bypass)
 346                 goto do_bypass;
 347             goto reset_flash;
 348         case 0x90:
 349             if (pfl->bypass && cmd == 0x00) {
 350                 /* Unlock bypass reset */
 351                 goto reset_flash;
 352             }
 353             /* We can enter CFI query mode from autoselect mode */
 354             if (boff == 0x55 && cmd == 0x98)
 355                 goto enter_CFI_mode;
 356             /* No break here */
 357         default:
 358             DPRINTF("%s: invalid write for command %02x\n",
 359                     __func__, pfl->cmd);
 360             goto reset_flash;
 361         }
 362     case 4:
 363         switch (pfl->cmd) {
 364         case 0xA0:
 365             /* Ignore writes while flash data write is occuring */
 366             /* As we suppose write is immediate, this should never happen */
 367             return;
 368         case 0x80:
 369             goto check_unlock1;
 370         default:
 371             /* Should never happen */
 372             DPRINTF("%s: invalid command state %02x (wc 4)\n",
 373                     __func__, pfl->cmd);
 374             goto reset_flash;
 375         }
 376         break;
 377     case 5:
 378         switch (cmd) {
 379         case 0x10:
 380             if (boff != pfl->unlock_addr[0]) {
 381                 DPRINTF("%s: chip erase: invalid address " TARGET_FMT_lx "\n",
 382                         __func__, offset);
 383                 goto reset_flash;
 384             }
 385             /* Chip erase */
 386             DPRINTF("%s: start chip erase\n", __func__);
 387             memset(pfl->storage, 0xFF, pfl->chip_len);
 388             pfl->status = 0x00;
 389             pflash_update(pfl, 0, pfl->chip_len);
 390             /* Let's wait 5 seconds before chip erase is done */
 391             qemu_mod_timer(pfl->timer,
 392                            qemu_get_clock(vm_clock) + (ticks_per_sec * 5));
 393             break;
 394         case 0x30:
 395             /* Sector erase */
 396             p = pfl->storage;
 397             offset &= ~(pfl->sector_len - 1);
 398             DPRINTF("%s: start sector erase at " TARGET_FMT_lx "\n", __func__,
 399                     offset);
 400             memset(p + offset, 0xFF, pfl->sector_len);
 401             pflash_update(pfl, offset, pfl->sector_len);
 402             pfl->status = 0x00;
 403             /* Let's wait 1/2 second before sector erase is done */
 404             qemu_mod_timer(pfl->timer,
 405                            qemu_get_clock(vm_clock) + (ticks_per_sec / 2));
 406             break;
 407         default:
 408             DPRINTF("%s: invalid command %02x (wc 5)\n", __func__, cmd);
 409             goto reset_flash;
 410         }
 411         pfl->cmd = cmd;
 412         break;
 413     case 6:
 414         switch (pfl->cmd) {
 415         case 0x10:
 416             /* Ignore writes during chip erase */
 417             return;
 418         case 0x30:
 419             /* Ignore writes during sector erase */
 420             return;
 421         default:
 422             /* Should never happen */
 423             DPRINTF("%s: invalid command state %02x (wc 6)\n",
 424                     __func__, pfl->cmd);
 425             goto reset_flash;
 426         }
 427         break;
 428     case 7: /* Special value for CFI queries */
 429         DPRINTF("%s: invalid write in CFI query mode\n", __func__);
 430         goto reset_flash;
 431     default:
 432         /* Should never happen */
 433         DPRINTF("%s: invalid write state (wc 7)\n",  __func__);
 434         goto reset_flash;
 435     }
 436     pfl->wcycle++;
 437
 438     return;
 439
 440     /* Reset flash */
 441  reset_flash:
 442     pfl->bypass = 0;
 443     pfl->wcycle = 0;
 444     pfl->cmd = 0;
 445     return;
 446
 447  do_bypass:
 448     pfl->wcycle = 2;
 449     pfl->cmd = 0;
 450     return;
 451 }
 452
 453
 454 static uint32_t pflash_readb (void *opaque, target_phys_addr_t addr)
 455 {
 456     return pflash_read(opaque, addr, 1);
 457 }
 458
 459 static uint32_t pflash_readw (void *opaque, target_phys_addr_t addr)
 460 {
 461     pflash_t *pfl = opaque;
 462
 463     return pflash_read(pfl, addr, 2);
 464 }
 465
 466 static uint32_t pflash_readl (void *opaque, target_phys_addr_t addr)
 467 {
 468     pflash_t *pfl = opaque;
 469
 470     return pflash_read(pfl, addr, 4);
 471 }
 472
 473 static void pflash_writeb (void *opaque, target_phys_addr_t addr,
 474                            uint32_t value)
 475 {
 476     pflash_write(opaque, addr, value, 1);
 477 }
 478
 479 static void pflash_writew (void *opaque, target_phys_addr_t addr,
 480                            uint32_t value)
 481 {
 482     pflash_t *pfl = opaque;
 483
 484     pflash_write(pfl, addr, value, 2);
 485 }
 486
 487 static void pflash_writel (void *opaque, target_phys_addr_t addr,
 488                            uint32_t value)
 489 {
 490     pflash_t *pfl = opaque;
 491
 492     pflash_write(pfl, addr, value, 4);
 493 }
 494
 495 static CPUWriteMemoryFunc *pflash_write_ops[] = {
 496     &pflash_writeb,
 497     &pflash_writew,
 498     &pflash_writel,
 499 };
 500
 501 static CPUReadMemoryFunc *pflash_read_ops[] = {
 502     &pflash_readb,
 503     &pflash_readw,
 504     &pflash_readl,
 505 };
 506
 507 /* Count trailing zeroes of a 32 bits quantity */
 508 static int ctz32 (uint32_t n)
 509 {
 510     int ret;
 511
 512     ret = 0;
 513     if (!(n & 0xFFFF)) {
 514         ret += 16;
 515         n = n >> 16;
 516     }
 517     if (!(n & 0xFF)) {
 518         ret += 8;
 519         n = n >> 8;
 520     }
 521     if (!(n & 0xF)) {
 522         ret += 4;
 523         n = n >> 4;
 524     }
 525     if (!(n & 0x3)) {
 526         ret += 2;
 527         n = n >> 2;
 528     }
 529     if (!(n & 0x1)) {
 530         ret++;
 531         n = n >> 1;
 532     }
 533 #if 0 /* This is not necessary as n is never 0 */
 534     if (!n)
 535         ret++;
 536 #endif
 537
 538     return ret;
 539 }
 540
 541 pflash_t *pflash_cfi02_register(target_phys_addr_t base, ram_addr_t off,
 542                                 BlockDriverState *bs, uint32_t sector_len,
 543                                 int nb_blocs, int nb_mappings, int width,
 544                                 uint16_t id0, uint16_t id1,
 545                                 uint16_t id2, uint16_t id3,
 546                                 uint16_t unlock_addr0, uint16_t unlock_addr1)
 547 {
 548     pflash_t *pfl;
 549     int32_t chip_len;
 550
 551     chip_len = sector_len * nb_blocs;
 552     /* XXX: to be fixed */
 553 #if 0
 554     if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
 555         total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
 556         return NULL;
 557 #endif
 558     pfl = qemu_mallocz(sizeof(pflash_t));
 559     /* FIXME: Allocate ram ourselves.  */
 560     pfl->storage = qemu_get_ram_ptr(off);
 561     pfl->fl_mem = cpu_register_io_memory(pflash_read_ops, pflash_write_ops,
 562                                          pfl);
 563     pfl->off = off;
 564     pfl->base = base;
 565     pfl->chip_len = chip_len;
 566     pfl->mappings = nb_mappings;
 567     pflash_register_memory(pfl, 1);
 568     pfl->bs = bs;
 569     if (pfl->bs) {
 570         /* read the initial flash content */
 571         bdrv_read(pfl->bs, 0, pfl->storage, chip_len >> 9);
 572     }
 573 #if 0 /* XXX: there should be a bit to set up read-only,
 574        *      the same way the hardware does (with WP pin).
 575        */
 576     pfl->ro = 1;
 577 #else
 578     pfl->ro = 0;
 579 #endif
 580     pfl->timer = qemu_new_timer(vm_clock, pflash_timer, pfl);
 581     pfl->sector_len = sector_len;
 582     pfl->width = width;
 583     pfl->wcycle = 0;
 584     pfl->cmd = 0;
 585     pfl->status = 0;
 586     pfl->ident[0] = id0;
 587     pfl->ident[1] = id1;
 588     pfl->ident[2] = id2;
 589     pfl->ident[3] = id3;
 590     pfl->unlock_addr[0] = unlock_addr0;
 591     pfl->unlock_addr[1] = unlock_addr1;
 592     /* Hardcoded CFI table (mostly from SG29 Spansion flash) */
 593     pfl->cfi_len = 0x52;
 594     /* Standard "QRY" string */
 595     pfl->cfi_table[0x10] = 'Q';
 596     pfl->cfi_table[0x11] = 'R';
 597     pfl->cfi_table[0x12] = 'Y';
 598     /* Command set (AMD/Fujitsu) */
 599     pfl->cfi_table[0x13] = 0x02;
 600     pfl->cfi_table[0x14] = 0x00;
 601     /* Primary extended table address */
 602     pfl->cfi_table[0x15] = 0x31;
 603     pfl->cfi_table[0x16] = 0x00;
 604     /* Alternate command set (none) */
 605     pfl->cfi_table[0x17] = 0x00;
 606     pfl->cfi_table[0x18] = 0x00;
 607     /* Alternate extended table (none) */
 608     pfl->cfi_table[0x19] = 0x00;
 609     pfl->cfi_table[0x1A] = 0x00;
 610     /* Vcc min */
 611     pfl->cfi_table[0x1B] = 0x27;
 612     /* Vcc max */
 613     pfl->cfi_table[0x1C] = 0x36;
 614     /* Vpp min (no Vpp pin) */
 615     pfl->cfi_table[0x1D] = 0x00;
 616     /* Vpp max (no Vpp pin) */
 617     pfl->cfi_table[0x1E] = 0x00;
 618     /* Reserved */
 619     pfl->cfi_table[0x1F] = 0x07;
 620     /* Timeout for min size buffer write (NA) */
 621     pfl->cfi_table[0x20] = 0x00;
 622     /* Typical timeout for block erase (512 ms) */
 623     pfl->cfi_table[0x21] = 0x09;
 624     /* Typical timeout for full chip erase (4096 ms) */
 625     pfl->cfi_table[0x22] = 0x0C;
 626     /* Reserved */
 627     pfl->cfi_table[0x23] = 0x01;
 628     /* Max timeout for buffer write (NA) */
 629     pfl->cfi_table[0x24] = 0x00;
 630     /* Max timeout for block erase */
 631     pfl->cfi_table[0x25] = 0x0A;
 632     /* Max timeout for chip erase */
 633     pfl->cfi_table[0x26] = 0x0D;
 634     /* Device size */
 635     pfl->cfi_table[0x27] = ctz32(chip_len);
 636     /* Flash device interface (8 & 16 bits) */
 637     pfl->cfi_table[0x28] = 0x02;
 638     pfl->cfi_table[0x29] = 0x00;
 639     /* Max number of bytes in multi-bytes write */
 640     /* XXX: disable buffered write as it's not supported */
 641     //    pfl->cfi_table[0x2A] = 0x05;
 642     pfl->cfi_table[0x2A] = 0x00;
 643     pfl->cfi_table[0x2B] = 0x00;
 644     /* Number of erase block regions (uniform) */
 645     pfl->cfi_table[0x2C] = 0x01;
 646     /* Erase block region 1 */
 647     pfl->cfi_table[0x2D] = nb_blocs - 1;
 648     pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8;
 649     pfl->cfi_table[0x2F] = sector_len >> 8;
 650     pfl->cfi_table[0x30] = sector_len >> 16;
 651
 652     /* Extended */
 653     pfl->cfi_table[0x31] = 'P';
 654     pfl->cfi_table[0x32] = 'R';
 655     pfl->cfi_table[0x33] = 'I';
 656
 657     pfl->cfi_table[0x34] = '1';
 658     pfl->cfi_table[0x35] = '0';
 659
 660     pfl->cfi_table[0x36] = 0x00;
 661     pfl->cfi_table[0x37] = 0x00;
 662     pfl->cfi_table[0x38] = 0x00;
 663     pfl->cfi_table[0x39] = 0x00;
 664
 665     pfl->cfi_table[0x3a] = 0x00;
 666
 667     pfl->cfi_table[0x3b] = 0x00;
 668     pfl->cfi_table[0x3c] = 0x00;
 669
 670     return pfl;
 671 }