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 #include "exec-memory.h"
  43 #include "host-utils.h"
  44
  45 //#define PFLASH_DEBUG
  46 #ifdef PFLASH_DEBUG
  47 #define DPRINTF(fmt, ...)                          \
  48 do {                                               \
  49     printf("PFLASH: " fmt , ## __VA_ARGS__);       \
  50 } while (0)
  51 #else
  52 #define DPRINTF(fmt, ...) do { } while (0)
  53 #endif
  54
  55 #define PFLASH_LAZY_ROMD_THRESHOLD 42
  56
  57 struct pflash_t {
  58     BlockDriverState *bs;
  59     target_phys_addr_t base;
  60     uint32_t sector_len;
  61     uint32_t chip_len;
  62     int mappings;
  63     int width;
  64     int wcycle; /* if 0, the flash is read normally */
  65     int bypass;
  66     int ro;
  67     uint8_t cmd;
  68     uint8_t status;
  69     uint16_t ident[4];
  70     uint16_t unlock_addr[2];
  71     uint8_t cfi_len;
  72     uint8_t cfi_table[0x52];
  73     QEMUTimer *timer;
  74     /* The device replicates the flash memory across its memory space.  Emulate
  75      * that by having a container (.mem) filled with an array of aliases
  76      * (.mem_mappings) pointing to the flash memory (.orig_mem).
  77      */
  78     MemoryRegion mem;
  79     MemoryRegion *mem_mappings;    /* array; one per mapping */
  80     MemoryRegion orig_mem;
  81     int rom_mode;
  82     int read_counter; /* used for lazy switch-back to rom mode */
  83     void *storage;
  84 };
  85
  86 /*
  87  * Set up replicated mappings of the same region.
  88  */
  89 static void pflash_setup_mappings(pflash_t *pfl)
  90 {
  91     unsigned i;
  92     target_phys_addr_t size = memory_region_size(&pfl->orig_mem);
  93
  94     memory_region_init(&pfl->mem, "pflash", pfl->mappings * size);
  95     pfl->mem_mappings = g_new(MemoryRegion, pfl->mappings);
  96     for (i = 0; i < pfl->mappings; ++i) {
  97         memory_region_init_alias(&pfl->mem_mappings[i], "pflash-alias",
  98                                  &pfl->orig_mem, 0, size);
  99         memory_region_add_subregion(&pfl->mem, i * size, &pfl->mem_mappings[i]);
 100     }
 101 }
 102
 103 static void pflash_register_memory(pflash_t *pfl, int rom_mode)
 104 {
 105     memory_region_rom_device_set_readable(&pfl->orig_mem, rom_mode);
 106     pfl->rom_mode = rom_mode;
 107 }
 108
 109 static void pflash_timer (void *opaque)
 110 {
 111     pflash_t *pfl = opaque;
 112
 113     DPRINTF("%s: command %02x done\n", __func__, pfl->cmd);
 114     /* Reset flash */
 115     pfl->status ^= 0x80;
 116     if (pfl->bypass) {
 117         pfl->wcycle = 2;
 118     } else {
 119         pflash_register_memory(pfl, 1);
 120         pfl->wcycle = 0;
 121     }
 122     pfl->cmd = 0;
 123 }
 124
 125 static uint32_t pflash_read (pflash_t *pfl, target_phys_addr_t offset,
 126                              int width, int be)
 127 {
 128     target_phys_addr_t boff;
 129     uint32_t ret;
 130     uint8_t *p;
 131
 132     DPRINTF("%s: offset " TARGET_FMT_plx "\n", __func__, offset);
 133     ret = -1;
 134     /* Lazy reset to ROMD mode after a certain amount of read accesses */
 135     if (!pfl->rom_mode && pfl->wcycle == 0 &&
 136         ++pfl->read_counter > PFLASH_LAZY_ROMD_THRESHOLD) {
 137         pflash_register_memory(pfl, 1);
 138     }
 139     offset &= pfl->chip_len - 1;
 140     boff = offset & 0xFF;
 141     if (pfl->width == 2)
 142         boff = boff >> 1;
 143     else if (pfl->width == 4)
 144         boff = boff >> 2;
 145     switch (pfl->cmd) {
 146     default:
 147         /* This should never happen : reset state & treat it as a read*/
 148         DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
 149         pfl->wcycle = 0;
 150         pfl->cmd = 0;
 151     case 0x80:
 152         /* We accept reads during second unlock sequence... */
 153     case 0x00:
 154     flash_read:
 155         /* Flash area read */
 156         p = pfl->storage;
 157         switch (width) {
 158         case 1:
 159             ret = p[offset];
 160 //            DPRINTF("%s: data offset %08x %02x\n", __func__, offset, ret);
 161             break;
 162         case 2:
 163             if (be) {
 164                 ret = p[offset] << 8;
 165                 ret |= p[offset + 1];
 166             } else {
 167                 ret = p[offset];
 168                 ret |= p[offset + 1] << 8;
 169             }
 170 //            DPRINTF("%s: data offset %08x %04x\n", __func__, offset, ret);
 171             break;
 172         case 4:
 173             if (be) {
 174                 ret = p[offset] << 24;
 175                 ret |= p[offset + 1] << 16;
 176                 ret |= p[offset + 2] << 8;
 177                 ret |= p[offset + 3];
 178             } else {
 179                 ret = p[offset];
 180                 ret |= p[offset + 1] << 8;
 181                 ret |= p[offset + 2] << 16;
 182                 ret |= p[offset + 3] << 24;
 183             }
 184 //            DPRINTF("%s: data offset %08x %08x\n", __func__, offset, ret);
 185             break;
 186         }
 187         break;
 188     case 0x90:
 189         /* flash ID read */
 190         switch (boff) {
 191         case 0x00:
 192         case 0x01:
 193             ret = pfl->ident[boff & 0x01];
 194             break;
 195         case 0x02:
 196             ret = 0x00; /* Pretend all sectors are unprotected */
 197             break;
 198         case 0x0E:
 199         case 0x0F:
 200             if (pfl->ident[2 + (boff & 0x01)] == (uint8_t)-1)
 201                 goto flash_read;
 202             ret = pfl->ident[2 + (boff & 0x01)];
 203             break;
 204         default:
 205             goto flash_read;
 206         }
 207         DPRINTF("%s: ID " TARGET_FMT_plx " %x\n", __func__, boff, ret);
 208         break;
 209     case 0xA0:
 210     case 0x10:
 211     case 0x30:
 212         /* Status register read */
 213         ret = pfl->status;
 214         DPRINTF("%s: status %x\n", __func__, ret);
 215         /* Toggle bit 6 */
 216         pfl->status ^= 0x40;
 217         break;
 218     case 0x98:
 219         /* CFI query mode */
 220         if (boff > pfl->cfi_len)
 221             ret = 0;
 222         else
 223             ret = pfl->cfi_table[boff];
 224         break;
 225     }
 226
 227     return ret;
 228 }
 229
 230 /* update flash content on disk */
 231 static void pflash_update(pflash_t *pfl, int offset,
 232                           int size)
 233 {
 234     int offset_end;
 235     if (pfl->bs) {
 236         offset_end = offset + size;
 237         /* round to sectors */
 238         offset = offset >> 9;
 239         offset_end = (offset_end + 511) >> 9;
 240         bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
 241                    offset_end - offset);
 242     }
 243 }
 244
 245 static void pflash_write (pflash_t *pfl, target_phys_addr_t offset,
 246                           uint32_t value, int width, int be)
 247 {
 248     target_phys_addr_t boff;
 249     uint8_t *p;
 250     uint8_t cmd;
 251
 252     cmd = value;
 253     if (pfl->cmd != 0xA0 && cmd == 0xF0) {
 254 #if 0
 255         DPRINTF("%s: flash reset asked (%02x %02x)\n",
 256                 __func__, pfl->cmd, cmd);
 257 #endif
 258         goto reset_flash;
 259     }
 260     DPRINTF("%s: offset " TARGET_FMT_plx " %08x %d %d\n", __func__,
 261             offset, value, width, pfl->wcycle);
 262     offset &= pfl->chip_len - 1;
 263
 264     DPRINTF("%s: offset " TARGET_FMT_plx " %08x %d\n", __func__,
 265             offset, value, width);
 266     boff = offset & (pfl->sector_len - 1);
 267     if (pfl->width == 2)
 268         boff = boff >> 1;
 269     else if (pfl->width == 4)
 270         boff = boff >> 2;
 271     switch (pfl->wcycle) {
 272     case 0:
 273         /* Set the device in I/O access mode if required */
 274         if (pfl->rom_mode)
 275             pflash_register_memory(pfl, 0);
 276         pfl->read_counter = 0;
 277         /* We're in read mode */
 278     check_unlock0:
 279         if (boff == 0x55 && cmd == 0x98) {
 280         enter_CFI_mode:
 281             /* Enter CFI query mode */
 282             pfl->wcycle = 7;
 283             pfl->cmd = 0x98;
 284             return;
 285         }
 286         if (boff != pfl->unlock_addr[0] || cmd != 0xAA) {
 287             DPRINTF("%s: unlock0 failed " TARGET_FMT_plx " %02x %04x\n",
 288                     __func__, boff, cmd, pfl->unlock_addr[0]);
 289             goto reset_flash;
 290         }
 291         DPRINTF("%s: unlock sequence started\n", __func__);
 292         break;
 293     case 1:
 294         /* We started an unlock sequence */
 295     check_unlock1:
 296         if (boff != pfl->unlock_addr[1] || cmd != 0x55) {
 297             DPRINTF("%s: unlock1 failed " TARGET_FMT_plx " %02x\n", __func__,
 298                     boff, cmd);
 299             goto reset_flash;
 300         }
 301         DPRINTF("%s: unlock sequence done\n", __func__);
 302         break;
 303     case 2:
 304         /* We finished an unlock sequence */
 305         if (!pfl->bypass && boff != pfl->unlock_addr[0]) {
 306             DPRINTF("%s: command failed " TARGET_FMT_plx " %02x\n", __func__,
 307                     boff, cmd);
 308             goto reset_flash;
 309         }
 310         switch (cmd) {
 311         case 0x20:
 312             pfl->bypass = 1;
 313             goto do_bypass;
 314         case 0x80:
 315         case 0x90:
 316         case 0xA0:
 317             pfl->cmd = cmd;
 318             DPRINTF("%s: starting command %02x\n", __func__, cmd);
 319             break;
 320         default:
 321             DPRINTF("%s: unknown command %02x\n", __func__, cmd);
 322             goto reset_flash;
 323         }
 324         break;
 325     case 3:
 326         switch (pfl->cmd) {
 327         case 0x80:
 328             /* We need another unlock sequence */
 329             goto check_unlock0;
 330         case 0xA0:
 331             DPRINTF("%s: write data offset " TARGET_FMT_plx " %08x %d\n",
 332                     __func__, offset, value, width);
 333             p = pfl->storage;
 334             if (!pfl->ro) {
 335                 switch (width) {
 336                 case 1:
 337                     p[offset] &= value;
 338                     pflash_update(pfl, offset, 1);
 339                     break;
 340                 case 2:
 341                     if (be) {
 342                         p[offset] &= value >> 8;
 343                         p[offset + 1] &= value;
 344                     } else {
 345                         p[offset] &= value;
 346                         p[offset + 1] &= value >> 8;
 347                     }
 348                     pflash_update(pfl, offset, 2);
 349                     break;
 350                 case 4:
 351                     if (be) {
 352                         p[offset] &= value >> 24;
 353                         p[offset + 1] &= value >> 16;
 354                         p[offset + 2] &= value >> 8;
 355                         p[offset + 3] &= value;
 356                     } else {
 357                         p[offset] &= value;
 358                         p[offset + 1] &= value >> 8;
 359                         p[offset + 2] &= value >> 16;
 360                         p[offset + 3] &= value >> 24;
 361                     }
 362                     pflash_update(pfl, offset, 4);
 363                     break;
 364                 }
 365             }
 366             pfl->status = 0x00 | ~(value & 0x80);
 367             /* Let's pretend write is immediate */
 368             if (pfl->bypass)
 369                 goto do_bypass;
 370             goto reset_flash;
 371         case 0x90:
 372             if (pfl->bypass && cmd == 0x00) {
 373                 /* Unlock bypass reset */
 374                 goto reset_flash;
 375             }
 376             /* We can enter CFI query mode from autoselect mode */
 377             if (boff == 0x55 && cmd == 0x98)
 378                 goto enter_CFI_mode;
 379             /* No break here */
 380         default:
 381             DPRINTF("%s: invalid write for command %02x\n",
 382                     __func__, pfl->cmd);
 383             goto reset_flash;
 384         }
 385     case 4:
 386         switch (pfl->cmd) {
 387         case 0xA0:
 388             /* Ignore writes while flash data write is occurring */
 389             /* As we suppose write is immediate, this should never happen */
 390             return;
 391         case 0x80:
 392             goto check_unlock1;
 393         default:
 394             /* Should never happen */
 395             DPRINTF("%s: invalid command state %02x (wc 4)\n",
 396                     __func__, pfl->cmd);
 397             goto reset_flash;
 398         }
 399         break;
 400     case 5:
 401         switch (cmd) {
 402         case 0x10:
 403             if (boff != pfl->unlock_addr[0]) {
 404                 DPRINTF("%s: chip erase: invalid address " TARGET_FMT_plx "\n",
 405                         __func__, offset);
 406                 goto reset_flash;
 407             }
 408             /* Chip erase */
 409             DPRINTF("%s: start chip erase\n", __func__);
 410             if (!pfl->ro) {
 411                 memset(pfl->storage, 0xFF, pfl->chip_len);
 412                 pflash_update(pfl, 0, pfl->chip_len);
 413             }
 414             pfl->status = 0x00;
 415             /* Let's wait 5 seconds before chip erase is done */
 416             qemu_mod_timer(pfl->timer,
 417                            qemu_get_clock_ns(vm_clock) + (get_ticks_per_sec() * 5));
 418             break;
 419         case 0x30:
 420             /* Sector erase */
 421             p = pfl->storage;
 422             offset &= ~(pfl->sector_len - 1);
 423             DPRINTF("%s: start sector erase at " TARGET_FMT_plx "\n", __func__,
 424                     offset);
 425             if (!pfl->ro) {
 426                 memset(p + offset, 0xFF, pfl->sector_len);
 427                 pflash_update(pfl, offset, pfl->sector_len);
 428             }
 429             pfl->status = 0x00;
 430             /* Let's wait 1/2 second before sector erase is done */
 431             qemu_mod_timer(pfl->timer,
 432                            qemu_get_clock_ns(vm_clock) + (get_ticks_per_sec() / 2));
 433             break;
 434         default:
 435             DPRINTF("%s: invalid command %02x (wc 5)\n", __func__, cmd);
 436             goto reset_flash;
 437         }
 438         pfl->cmd = cmd;
 439         break;
 440     case 6:
 441         switch (pfl->cmd) {
 442         case 0x10:
 443             /* Ignore writes during chip erase */
 444             return;
 445         case 0x30:
 446             /* Ignore writes during sector erase */
 447             return;
 448         default:
 449             /* Should never happen */
 450             DPRINTF("%s: invalid command state %02x (wc 6)\n",
 451                     __func__, pfl->cmd);
 452             goto reset_flash;
 453         }
 454         break;
 455     case 7: /* Special value for CFI queries */
 456         DPRINTF("%s: invalid write in CFI query mode\n", __func__);
 457         goto reset_flash;
 458     default:
 459         /* Should never happen */
 460         DPRINTF("%s: invalid write state (wc 7)\n",  __func__);
 461         goto reset_flash;
 462     }
 463     pfl->wcycle++;
 464
 465     return;
 466
 467     /* Reset flash */
 468  reset_flash:
 469     pfl->bypass = 0;
 470     pfl->wcycle = 0;
 471     pfl->cmd = 0;
 472     return;
 473
 474  do_bypass:
 475     pfl->wcycle = 2;
 476     pfl->cmd = 0;
 477     return;
 478 }
 479
 480
 481 static uint32_t pflash_readb_be(void *opaque, target_phys_addr_t addr)
 482 {
 483     return pflash_read(opaque, addr, 1, 1);
 484 }
 485
 486 static uint32_t pflash_readb_le(void *opaque, target_phys_addr_t addr)
 487 {
 488     return pflash_read(opaque, addr, 1, 0);
 489 }
 490
 491 static uint32_t pflash_readw_be(void *opaque, target_phys_addr_t addr)
 492 {
 493     pflash_t *pfl = opaque;
 494
 495     return pflash_read(pfl, addr, 2, 1);
 496 }
 497
 498 static uint32_t pflash_readw_le(void *opaque, target_phys_addr_t addr)
 499 {
 500     pflash_t *pfl = opaque;
 501
 502     return pflash_read(pfl, addr, 2, 0);
 503 }
 504
 505 static uint32_t pflash_readl_be(void *opaque, target_phys_addr_t addr)
 506 {
 507     pflash_t *pfl = opaque;
 508
 509     return pflash_read(pfl, addr, 4, 1);
 510 }
 511
 512 static uint32_t pflash_readl_le(void *opaque, target_phys_addr_t addr)
 513 {
 514     pflash_t *pfl = opaque;
 515
 516     return pflash_read(pfl, addr, 4, 0);
 517 }
 518
 519 static void pflash_writeb_be(void *opaque, target_phys_addr_t addr,
 520                              uint32_t value)
 521 {
 522     pflash_write(opaque, addr, value, 1, 1);
 523 }
 524
 525 static void pflash_writeb_le(void *opaque, target_phys_addr_t addr,
 526                              uint32_t value)
 527 {
 528     pflash_write(opaque, addr, value, 1, 0);
 529 }
 530
 531 static void pflash_writew_be(void *opaque, target_phys_addr_t addr,
 532                              uint32_t value)
 533 {
 534     pflash_t *pfl = opaque;
 535
 536     pflash_write(pfl, addr, value, 2, 1);
 537 }
 538
 539 static void pflash_writew_le(void *opaque, target_phys_addr_t addr,
 540                              uint32_t value)
 541 {
 542     pflash_t *pfl = opaque;
 543
 544     pflash_write(pfl, addr, value, 2, 0);
 545 }
 546
 547 static void pflash_writel_be(void *opaque, target_phys_addr_t addr,
 548                              uint32_t value)
 549 {
 550     pflash_t *pfl = opaque;
 551
 552     pflash_write(pfl, addr, value, 4, 1);
 553 }
 554
 555 static void pflash_writel_le(void *opaque, target_phys_addr_t addr,
 556                              uint32_t value)
 557 {
 558     pflash_t *pfl = opaque;
 559
 560     pflash_write(pfl, addr, value, 4, 0);
 561 }
 562
 563 static const MemoryRegionOps pflash_cfi02_ops_be = {
 564     .old_mmio = {
 565         .read = { pflash_readb_be, pflash_readw_be, pflash_readl_be, },
 566         .write = { pflash_writeb_be, pflash_writew_be, pflash_writel_be, },
 567     },
 568     .endianness = DEVICE_NATIVE_ENDIAN,
 569 };
 570
 571 static const MemoryRegionOps pflash_cfi02_ops_le = {
 572     .old_mmio = {
 573         .read = { pflash_readb_le, pflash_readw_le, pflash_readl_le, },
 574         .write = { pflash_writeb_le, pflash_writew_le, pflash_writel_le, },
 575     },
 576     .endianness = DEVICE_NATIVE_ENDIAN,
 577 };
 578
 579 pflash_t *pflash_cfi02_register(target_phys_addr_t base,
 580                                 DeviceState *qdev, const char *name,
 581                                 target_phys_addr_t size,
 582                                 BlockDriverState *bs, uint32_t sector_len,
 583                                 int nb_blocs, int nb_mappings, int width,
 584                                 uint16_t id0, uint16_t id1,
 585                                 uint16_t id2, uint16_t id3,
 586                                 uint16_t unlock_addr0, uint16_t unlock_addr1,
 587                                 int be)
 588 {
 589     pflash_t *pfl;
 590     int32_t chip_len;
 591     int ret;
 592
 593     chip_len = sector_len * nb_blocs;
 594     /* XXX: to be fixed */
 595 #if 0
 596     if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
 597         total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
 598         return NULL;
 599 #endif
 600     pfl = g_malloc0(sizeof(pflash_t));
 601     memory_region_init_rom_device(
 602         &pfl->orig_mem, be ? &pflash_cfi02_ops_be : &pflash_cfi02_ops_le, pfl,
 603         name, size);
 604     vmstate_register_ram(&pfl->orig_mem, qdev);
 605     pfl->storage = memory_region_get_ram_ptr(&pfl->orig_mem);
 606     pfl->base = base;
 607     pfl->chip_len = chip_len;
 608     pfl->mappings = nb_mappings;
 609     pfl->bs = bs;
 610     if (pfl->bs) {
 611         /* read the initial flash content */
 612         ret = bdrv_read(pfl->bs, 0, pfl->storage, chip_len >> 9);
 613         if (ret < 0) {
 614             g_free(pfl);
 615             return NULL;
 616         }
 617         bdrv_attach_dev_nofail(pfl->bs, pfl);
 618     }
 619
 620     pflash_setup_mappings(pfl);
 621     pfl->rom_mode = 1;
 622     memory_region_add_subregion(get_system_memory(), pfl->base, &pfl->mem);
 623
 624     if (pfl->bs) {
 625         pfl->ro = bdrv_is_read_only(pfl->bs);
 626     } else {
 627         pfl->ro = 0;
 628     }
 629
 630     pfl->timer = qemu_new_timer_ns(vm_clock, pflash_timer, pfl);
 631     pfl->sector_len = sector_len;
 632     pfl->width = width;
 633     pfl->wcycle = 0;
 634     pfl->cmd = 0;
 635     pfl->status = 0;
 636     pfl->ident[0] = id0;
 637     pfl->ident[1] = id1;
 638     pfl->ident[2] = id2;
 639     pfl->ident[3] = id3;
 640     pfl->unlock_addr[0] = unlock_addr0;
 641     pfl->unlock_addr[1] = unlock_addr1;
 642     /* Hardcoded CFI table (mostly from SG29 Spansion flash) */
 643     pfl->cfi_len = 0x52;
 644     /* Standard "QRY" string */
 645     pfl->cfi_table[0x10] = 'Q';
 646     pfl->cfi_table[0x11] = 'R';
 647     pfl->cfi_table[0x12] = 'Y';
 648     /* Command set (AMD/Fujitsu) */
 649     pfl->cfi_table[0x13] = 0x02;
 650     pfl->cfi_table[0x14] = 0x00;
 651     /* Primary extended table address */
 652     pfl->cfi_table[0x15] = 0x31;
 653     pfl->cfi_table[0x16] = 0x00;
 654     /* Alternate command set (none) */
 655     pfl->cfi_table[0x17] = 0x00;
 656     pfl->cfi_table[0x18] = 0x00;
 657     /* Alternate extended table (none) */
 658     pfl->cfi_table[0x19] = 0x00;
 659     pfl->cfi_table[0x1A] = 0x00;
 660     /* Vcc min */
 661     pfl->cfi_table[0x1B] = 0x27;
 662     /* Vcc max */
 663     pfl->cfi_table[0x1C] = 0x36;
 664     /* Vpp min (no Vpp pin) */
 665     pfl->cfi_table[0x1D] = 0x00;
 666     /* Vpp max (no Vpp pin) */
 667     pfl->cfi_table[0x1E] = 0x00;
 668     /* Reserved */
 669     pfl->cfi_table[0x1F] = 0x07;
 670     /* Timeout for min size buffer write (NA) */
 671     pfl->cfi_table[0x20] = 0x00;
 672     /* Typical timeout for block erase (512 ms) */
 673     pfl->cfi_table[0x21] = 0x09;
 674     /* Typical timeout for full chip erase (4096 ms) */
 675     pfl->cfi_table[0x22] = 0x0C;
 676     /* Reserved */
 677     pfl->cfi_table[0x23] = 0x01;
 678     /* Max timeout for buffer write (NA) */
 679     pfl->cfi_table[0x24] = 0x00;
 680     /* Max timeout for block erase */
 681     pfl->cfi_table[0x25] = 0x0A;
 682     /* Max timeout for chip erase */
 683     pfl->cfi_table[0x26] = 0x0D;
 684     /* Device size */
 685     pfl->cfi_table[0x27] = ctz32(chip_len);
 686     /* Flash device interface (8 & 16 bits) */
 687     pfl->cfi_table[0x28] = 0x02;
 688     pfl->cfi_table[0x29] = 0x00;
 689     /* Max number of bytes in multi-bytes write */
 690     /* XXX: disable buffered write as it's not supported */
 691     //    pfl->cfi_table[0x2A] = 0x05;
 692     pfl->cfi_table[0x2A] = 0x00;
 693     pfl->cfi_table[0x2B] = 0x00;
 694     /* Number of erase block regions (uniform) */
 695     pfl->cfi_table[0x2C] = 0x01;
 696     /* Erase block region 1 */
 697     pfl->cfi_table[0x2D] = nb_blocs - 1;
 698     pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8;
 699     pfl->cfi_table[0x2F] = sector_len >> 8;
 700     pfl->cfi_table[0x30] = sector_len >> 16;
 701
 702     /* Extended */
 703     pfl->cfi_table[0x31] = 'P';
 704     pfl->cfi_table[0x32] = 'R';
 705     pfl->cfi_table[0x33] = 'I';
 706
 707     pfl->cfi_table[0x34] = '1';
 708     pfl->cfi_table[0x35] = '0';
 709
 710     pfl->cfi_table[0x36] = 0x00;
 711     pfl->cfi_table[0x37] = 0x00;
 712     pfl->cfi_table[0x38] = 0x00;
 713     pfl->cfi_table[0x39] = 0x00;
 714
 715     pfl->cfi_table[0x3a] = 0x00;
 716
 717     pfl->cfi_table[0x3b] = 0x00;
 718     pfl->cfi_table[0x3c] = 0x00;
 719
 720     return pfl;
 721 }