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, target_phys_addr_t offset,
 107                              int width, int be)
 108 {
 109     target_phys_addr_t boff;
 110     uint32_t ret;
 111     uint8_t *p;
 112
 113     DPRINTF("%s: offset " TARGET_FMT_plx "\n", __func__, offset);
 114     ret = -1;
 115     if (pfl->rom_mode) {
 116         /* Lazy reset of to ROMD mode */
 117         if (pfl->wcycle == 0)
 118             pflash_register_memory(pfl, 1);
 119     }
 120     offset &= pfl->chip_len - 1;
 121     boff = offset & 0xFF;
 122     if (pfl->width == 2)
 123         boff = boff >> 1;
 124     else if (pfl->width == 4)
 125         boff = boff >> 2;
 126     switch (pfl->cmd) {
 127     default:
 128         /* This should never happen : reset state & treat it as a read*/
 129         DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
 130         pfl->wcycle = 0;
 131         pfl->cmd = 0;
 132     case 0x80:
 133         /* We accept reads during second unlock sequence... */
 134     case 0x00:
 135     flash_read:
 136         /* Flash area read */
 137         p = pfl->storage;
 138         switch (width) {
 139         case 1:
 140             ret = p[offset];
 141 //            DPRINTF("%s: data offset %08x %02x\n", __func__, offset, ret);
 142             break;
 143         case 2:
 144             if (be) {
 145                 ret = p[offset] << 8;
 146                 ret |= p[offset + 1];
 147             } else {
 148                 ret = p[offset];
 149                 ret |= p[offset + 1] << 8;
 150             }
 151 //            DPRINTF("%s: data offset %08x %04x\n", __func__, offset, ret);
 152             break;
 153         case 4:
 154             if (be) {
 155                 ret = p[offset] << 24;
 156                 ret |= p[offset + 1] << 16;
 157                 ret |= p[offset + 2] << 8;
 158                 ret |= p[offset + 3];
 159             } else {
 160                 ret = p[offset];
 161                 ret |= p[offset + 1] << 8;
 162                 ret |= p[offset + 2] << 16;
 163                 ret |= p[offset + 3] << 24;
 164             }
 165 //            DPRINTF("%s: data offset %08x %08x\n", __func__, offset, ret);
 166             break;
 167         }
 168         break;
 169     case 0x90:
 170         /* flash ID read */
 171         switch (boff) {
 172         case 0x00:
 173         case 0x01:
 174             ret = pfl->ident[boff & 0x01];
 175             break;
 176         case 0x02:
 177             ret = 0x00; /* Pretend all sectors are unprotected */
 178             break;
 179         case 0x0E:
 180         case 0x0F:
 181             if (pfl->ident[2 + (boff & 0x01)] == (uint8_t)-1)
 182                 goto flash_read;
 183             ret = pfl->ident[2 + (boff & 0x01)];
 184             break;
 185         default:
 186             goto flash_read;
 187         }
 188         DPRINTF("%s: ID " TARGET_FMT_pld " %x\n", __func__, boff, ret);
 189         break;
 190     case 0xA0:
 191     case 0x10:
 192     case 0x30:
 193         /* Status register read */
 194         ret = pfl->status;
 195         DPRINTF("%s: status %x\n", __func__, ret);
 196         /* Toggle bit 6 */
 197         pfl->status ^= 0x40;
 198         break;
 199     case 0x98:
 200         /* CFI query mode */
 201         if (boff > pfl->cfi_len)
 202             ret = 0;
 203         else
 204             ret = pfl->cfi_table[boff];
 205         break;
 206     }
 207
 208     return ret;
 209 }
 210
 211 /* update flash content on disk */
 212 static void pflash_update(pflash_t *pfl, int offset,
 213                           int size)
 214 {
 215     int offset_end;
 216     if (pfl->bs) {
 217         offset_end = offset + size;
 218         /* round to sectors */
 219         offset = offset >> 9;
 220         offset_end = (offset_end + 511) >> 9;
 221         bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
 222                    offset_end - offset);
 223     }
 224 }
 225
 226 static void pflash_write (pflash_t *pfl, target_phys_addr_t offset,
 227                           uint32_t value, int width, int be)
 228 {
 229     target_phys_addr_t boff;
 230     uint8_t *p;
 231     uint8_t cmd;
 232
 233     cmd = value;
 234     if (pfl->cmd != 0xA0 && cmd == 0xF0) {
 235 #if 0
 236         DPRINTF("%s: flash reset asked (%02x %02x)\n",
 237                 __func__, pfl->cmd, cmd);
 238 #endif
 239         goto reset_flash;
 240     }
 241     DPRINTF("%s: offset " TARGET_FMT_plx " %08x %d %d\n", __func__,
 242             offset, value, width, pfl->wcycle);
 243     offset &= pfl->chip_len - 1;
 244
 245     DPRINTF("%s: offset " TARGET_FMT_plx " %08x %d\n", __func__,
 246             offset, value, width);
 247     boff = offset & (pfl->sector_len - 1);
 248     if (pfl->width == 2)
 249         boff = boff >> 1;
 250     else if (pfl->width == 4)
 251         boff = boff >> 2;
 252     switch (pfl->wcycle) {
 253     case 0:
 254         /* Set the device in I/O access mode if required */
 255         if (pfl->rom_mode)
 256             pflash_register_memory(pfl, 0);
 257         /* We're in read mode */
 258     check_unlock0:
 259         if (boff == 0x55 && cmd == 0x98) {
 260         enter_CFI_mode:
 261             /* Enter CFI query mode */
 262             pfl->wcycle = 7;
 263             pfl->cmd = 0x98;
 264             return;
 265         }
 266         if (boff != pfl->unlock_addr[0] || cmd != 0xAA) {
 267             DPRINTF("%s: unlock0 failed " TARGET_FMT_plx " %02x %04x\n",
 268                     __func__, boff, cmd, pfl->unlock_addr[0]);
 269             goto reset_flash;
 270         }
 271         DPRINTF("%s: unlock sequence started\n", __func__);
 272         break;
 273     case 1:
 274         /* We started an unlock sequence */
 275     check_unlock1:
 276         if (boff != pfl->unlock_addr[1] || cmd != 0x55) {
 277             DPRINTF("%s: unlock1 failed " TARGET_FMT_plx " %02x\n", __func__,
 278                     boff, cmd);
 279             goto reset_flash;
 280         }
 281         DPRINTF("%s: unlock sequence done\n", __func__);
 282         break;
 283     case 2:
 284         /* We finished an unlock sequence */
 285         if (!pfl->bypass && boff != pfl->unlock_addr[0]) {
 286             DPRINTF("%s: command failed " TARGET_FMT_plx " %02x\n", __func__,
 287                     boff, cmd);
 288             goto reset_flash;
 289         }
 290         switch (cmd) {
 291         case 0x20:
 292             pfl->bypass = 1;
 293             goto do_bypass;
 294         case 0x80:
 295         case 0x90:
 296         case 0xA0:
 297             pfl->cmd = cmd;
 298             DPRINTF("%s: starting command %02x\n", __func__, cmd);
 299             break;
 300         default:
 301             DPRINTF("%s: unknown command %02x\n", __func__, cmd);
 302             goto reset_flash;
 303         }
 304         break;
 305     case 3:
 306         switch (pfl->cmd) {
 307         case 0x80:
 308             /* We need another unlock sequence */
 309             goto check_unlock0;
 310         case 0xA0:
 311             DPRINTF("%s: write data offset " TARGET_FMT_plx " %08x %d\n",
 312                     __func__, offset, value, width);
 313             p = pfl->storage;
 314             switch (width) {
 315             case 1:
 316                 p[offset] &= value;
 317                 pflash_update(pfl, offset, 1);
 318                 break;
 319             case 2:
 320                 if (be) {
 321                     p[offset] &= value >> 8;
 322                     p[offset + 1] &= value;
 323                 } else {
 324                     p[offset] &= value;
 325                     p[offset + 1] &= value >> 8;
 326                 }
 327                 pflash_update(pfl, offset, 2);
 328                 break;
 329             case 4:
 330                 if (be) {
 331                     p[offset] &= value >> 24;
 332                     p[offset + 1] &= value >> 16;
 333                     p[offset + 2] &= value >> 8;
 334                     p[offset + 3] &= value;
 335                 } else {
 336                     p[offset] &= value;
 337                     p[offset + 1] &= value >> 8;
 338                     p[offset + 2] &= value >> 16;
 339                     p[offset + 3] &= value >> 24;
 340                 }
 341                 pflash_update(pfl, offset, 4);
 342                 break;
 343             }
 344             pfl->status = 0x00 | ~(value & 0x80);
 345             /* Let's pretend write is immediate */
 346             if (pfl->bypass)
 347                 goto do_bypass;
 348             goto reset_flash;
 349         case 0x90:
 350             if (pfl->bypass && cmd == 0x00) {
 351                 /* Unlock bypass reset */
 352                 goto reset_flash;
 353             }
 354             /* We can enter CFI query mode from autoselect mode */
 355             if (boff == 0x55 && cmd == 0x98)
 356                 goto enter_CFI_mode;
 357             /* No break here */
 358         default:
 359             DPRINTF("%s: invalid write for command %02x\n",
 360                     __func__, pfl->cmd);
 361             goto reset_flash;
 362         }
 363     case 4:
 364         switch (pfl->cmd) {
 365         case 0xA0:
 366             /* Ignore writes while flash data write is occuring */
 367             /* As we suppose write is immediate, this should never happen */
 368             return;
 369         case 0x80:
 370             goto check_unlock1;
 371         default:
 372             /* Should never happen */
 373             DPRINTF("%s: invalid command state %02x (wc 4)\n",
 374                     __func__, pfl->cmd);
 375             goto reset_flash;
 376         }
 377         break;
 378     case 5:
 379         switch (cmd) {
 380         case 0x10:
 381             if (boff != pfl->unlock_addr[0]) {
 382                 DPRINTF("%s: chip erase: invalid address " TARGET_FMT_plx "\n",
 383                         __func__, offset);
 384                 goto reset_flash;
 385             }
 386             /* Chip erase */
 387             DPRINTF("%s: start chip erase\n", __func__);
 388             memset(pfl->storage, 0xFF, pfl->chip_len);
 389             pfl->status = 0x00;
 390             pflash_update(pfl, 0, pfl->chip_len);
 391             /* Let's wait 5 seconds before chip erase is done */
 392             qemu_mod_timer(pfl->timer,
 393                            qemu_get_clock(vm_clock) + (get_ticks_per_sec() * 5));
 394             break;
 395         case 0x30:
 396             /* Sector erase */
 397             p = pfl->storage;
 398             offset &= ~(pfl->sector_len - 1);
 399             DPRINTF("%s: start sector erase at " TARGET_FMT_plx "\n", __func__,
 400                     offset);
 401             memset(p + offset, 0xFF, pfl->sector_len);
 402             pflash_update(pfl, offset, pfl->sector_len);
 403             pfl->status = 0x00;
 404             /* Let's wait 1/2 second before sector erase is done */
 405             qemu_mod_timer(pfl->timer,
 406                            qemu_get_clock(vm_clock) + (get_ticks_per_sec() / 2));
 407             break;
 408         default:
 409             DPRINTF("%s: invalid command %02x (wc 5)\n", __func__, cmd);
 410             goto reset_flash;
 411         }
 412         pfl->cmd = cmd;
 413         break;
 414     case 6:
 415         switch (pfl->cmd) {
 416         case 0x10:
 417             /* Ignore writes during chip erase */
 418             return;
 419         case 0x30:
 420             /* Ignore writes during sector erase */
 421             return;
 422         default:
 423             /* Should never happen */
 424             DPRINTF("%s: invalid command state %02x (wc 6)\n",
 425                     __func__, pfl->cmd);
 426             goto reset_flash;
 427         }
 428         break;
 429     case 7: /* Special value for CFI queries */
 430         DPRINTF("%s: invalid write in CFI query mode\n", __func__);
 431         goto reset_flash;
 432     default:
 433         /* Should never happen */
 434         DPRINTF("%s: invalid write state (wc 7)\n",  __func__);
 435         goto reset_flash;
 436     }
 437     pfl->wcycle++;
 438
 439     return;
 440
 441     /* Reset flash */
 442  reset_flash:
 443     pfl->bypass = 0;
 444     pfl->wcycle = 0;
 445     pfl->cmd = 0;
 446     return;
 447
 448  do_bypass:
 449     pfl->wcycle = 2;
 450     pfl->cmd = 0;
 451     return;
 452 }
 453
 454
 455 static uint32_t pflash_readb_be(void *opaque, target_phys_addr_t addr)
 456 {
 457     return pflash_read(opaque, addr, 1, 1);
 458 }
 459
 460 static uint32_t pflash_readb_le(void *opaque, target_phys_addr_t addr)
 461 {
 462     return pflash_read(opaque, addr, 1, 0);
 463 }
 464
 465 static uint32_t pflash_readw_be(void *opaque, target_phys_addr_t addr)
 466 {
 467     pflash_t *pfl = opaque;
 468
 469     return pflash_read(pfl, addr, 2, 1);
 470 }
 471
 472 static uint32_t pflash_readw_le(void *opaque, target_phys_addr_t addr)
 473 {
 474     pflash_t *pfl = opaque;
 475
 476     return pflash_read(pfl, addr, 2, 0);
 477 }
 478
 479 static uint32_t pflash_readl_be(void *opaque, target_phys_addr_t addr)
 480 {
 481     pflash_t *pfl = opaque;
 482
 483     return pflash_read(pfl, addr, 4, 1);
 484 }
 485
 486 static uint32_t pflash_readl_le(void *opaque, target_phys_addr_t addr)
 487 {
 488     pflash_t *pfl = opaque;
 489
 490     return pflash_read(pfl, addr, 4, 0);
 491 }
 492
 493 static void pflash_writeb_be(void *opaque, target_phys_addr_t addr,
 494                              uint32_t value)
 495 {
 496     pflash_write(opaque, addr, value, 1, 1);
 497 }
 498
 499 static void pflash_writeb_le(void *opaque, target_phys_addr_t addr,
 500                              uint32_t value)
 501 {
 502     pflash_write(opaque, addr, value, 1, 0);
 503 }
 504
 505 static void pflash_writew_be(void *opaque, target_phys_addr_t addr,
 506                              uint32_t value)
 507 {
 508     pflash_t *pfl = opaque;
 509
 510     pflash_write(pfl, addr, value, 2, 1);
 511 }
 512
 513 static void pflash_writew_le(void *opaque, target_phys_addr_t addr,
 514                              uint32_t value)
 515 {
 516     pflash_t *pfl = opaque;
 517
 518     pflash_write(pfl, addr, value, 2, 0);
 519 }
 520
 521 static void pflash_writel_be(void *opaque, target_phys_addr_t addr,
 522                              uint32_t value)
 523 {
 524     pflash_t *pfl = opaque;
 525
 526     pflash_write(pfl, addr, value, 4, 1);
 527 }
 528
 529 static void pflash_writel_le(void *opaque, target_phys_addr_t addr,
 530                              uint32_t value)
 531 {
 532     pflash_t *pfl = opaque;
 533
 534     pflash_write(pfl, addr, value, 4, 0);
 535 }
 536
 537 static CPUWriteMemoryFunc * const pflash_write_ops_be[] = {
 538     &pflash_writeb_be,
 539     &pflash_writew_be,
 540     &pflash_writel_be,
 541 };
 542
 543 static CPUReadMemoryFunc * const pflash_read_ops_be[] = {
 544     &pflash_readb_be,
 545     &pflash_readw_be,
 546     &pflash_readl_be,
 547 };
 548
 549 static CPUWriteMemoryFunc * const pflash_write_ops_le[] = {
 550     &pflash_writeb_le,
 551     &pflash_writew_le,
 552     &pflash_writel_le,
 553 };
 554
 555 static CPUReadMemoryFunc * const pflash_read_ops_le[] = {
 556     &pflash_readb_le,
 557     &pflash_readw_le,
 558     &pflash_readl_le,
 559 };
 560
 561 /* Count trailing zeroes of a 32 bits quantity */
 562 static int ctz32 (uint32_t n)
 563 {
 564     int ret;
 565
 566     ret = 0;
 567     if (!(n & 0xFFFF)) {
 568         ret += 16;
 569         n = n >> 16;
 570     }
 571     if (!(n & 0xFF)) {
 572         ret += 8;
 573         n = n >> 8;
 574     }
 575     if (!(n & 0xF)) {
 576         ret += 4;
 577         n = n >> 4;
 578     }
 579     if (!(n & 0x3)) {
 580         ret += 2;
 581         n = n >> 2;
 582     }
 583     if (!(n & 0x1)) {
 584         ret++;
 585 #if 0 /* This is not necessary as n is never 0 */
 586         n = n >> 1;
 587 #endif
 588     }
 589 #if 0 /* This is not necessary as n is never 0 */
 590     if (!n)
 591         ret++;
 592 #endif
 593
 594     return ret;
 595 }
 596
 597 pflash_t *pflash_cfi02_register(target_phys_addr_t base, ram_addr_t off,
 598                                 BlockDriverState *bs, uint32_t sector_len,
 599                                 int nb_blocs, int nb_mappings, int width,
 600                                 uint16_t id0, uint16_t id1,
 601                                 uint16_t id2, uint16_t id3,
 602                                 uint16_t unlock_addr0, uint16_t unlock_addr1,
 603                                 int be)
 604 {
 605     pflash_t *pfl;
 606     int32_t chip_len;
 607     int ret;
 608
 609     chip_len = sector_len * nb_blocs;
 610     /* XXX: to be fixed */
 611 #if 0
 612     if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
 613         total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
 614         return NULL;
 615 #endif
 616     pfl = qemu_mallocz(sizeof(pflash_t));
 617     /* FIXME: Allocate ram ourselves.  */
 618     pfl->storage = qemu_get_ram_ptr(off);
 619     if (be) {
 620         pfl->fl_mem = cpu_register_io_memory(pflash_read_ops_be,
 621                                              pflash_write_ops_be,
 622                                              pfl);
 623     } else {
 624         pfl->fl_mem = cpu_register_io_memory(pflash_read_ops_le,
 625                                              pflash_write_ops_le,
 626                                              pfl);
 627     }
 628     pfl->off = off;
 629     pfl->base = base;
 630     pfl->chip_len = chip_len;
 631     pfl->mappings = nb_mappings;
 632     pflash_register_memory(pfl, 1);
 633     pfl->bs = bs;
 634     if (pfl->bs) {
 635         /* read the initial flash content */
 636         ret = bdrv_read(pfl->bs, 0, pfl->storage, chip_len >> 9);
 637         if (ret < 0) {
 638             cpu_unregister_io_memory(pfl->fl_mem);
 639             qemu_free(pfl);
 640             return NULL;
 641         }
 642     }
 643 #if 0 /* XXX: there should be a bit to set up read-only,
 644        *      the same way the hardware does (with WP pin).
 645        */
 646     pfl->ro = 1;
 647 #else
 648     pfl->ro = 0;
 649 #endif
 650     pfl->timer = qemu_new_timer(vm_clock, pflash_timer, pfl);
 651     pfl->sector_len = sector_len;
 652     pfl->width = width;
 653     pfl->wcycle = 0;
 654     pfl->cmd = 0;
 655     pfl->status = 0;
 656     pfl->ident[0] = id0;
 657     pfl->ident[1] = id1;
 658     pfl->ident[2] = id2;
 659     pfl->ident[3] = id3;
 660     pfl->unlock_addr[0] = unlock_addr0;
 661     pfl->unlock_addr[1] = unlock_addr1;
 662     /* Hardcoded CFI table (mostly from SG29 Spansion flash) */
 663     pfl->cfi_len = 0x52;
 664     /* Standard "QRY" string */
 665     pfl->cfi_table[0x10] = 'Q';
 666     pfl->cfi_table[0x11] = 'R';
 667     pfl->cfi_table[0x12] = 'Y';
 668     /* Command set (AMD/Fujitsu) */
 669     pfl->cfi_table[0x13] = 0x02;
 670     pfl->cfi_table[0x14] = 0x00;
 671     /* Primary extended table address */
 672     pfl->cfi_table[0x15] = 0x31;
 673     pfl->cfi_table[0x16] = 0x00;
 674     /* Alternate command set (none) */
 675     pfl->cfi_table[0x17] = 0x00;
 676     pfl->cfi_table[0x18] = 0x00;
 677     /* Alternate extended table (none) */
 678     pfl->cfi_table[0x19] = 0x00;
 679     pfl->cfi_table[0x1A] = 0x00;
 680     /* Vcc min */
 681     pfl->cfi_table[0x1B] = 0x27;
 682     /* Vcc max */
 683     pfl->cfi_table[0x1C] = 0x36;
 684     /* Vpp min (no Vpp pin) */
 685     pfl->cfi_table[0x1D] = 0x00;
 686     /* Vpp max (no Vpp pin) */
 687     pfl->cfi_table[0x1E] = 0x00;
 688     /* Reserved */
 689     pfl->cfi_table[0x1F] = 0x07;
 690     /* Timeout for min size buffer write (NA) */
 691     pfl->cfi_table[0x20] = 0x00;
 692     /* Typical timeout for block erase (512 ms) */
 693     pfl->cfi_table[0x21] = 0x09;
 694     /* Typical timeout for full chip erase (4096 ms) */
 695     pfl->cfi_table[0x22] = 0x0C;
 696     /* Reserved */
 697     pfl->cfi_table[0x23] = 0x01;
 698     /* Max timeout for buffer write (NA) */
 699     pfl->cfi_table[0x24] = 0x00;
 700     /* Max timeout for block erase */
 701     pfl->cfi_table[0x25] = 0x0A;
 702     /* Max timeout for chip erase */
 703     pfl->cfi_table[0x26] = 0x0D;
 704     /* Device size */
 705     pfl->cfi_table[0x27] = ctz32(chip_len);
 706     /* Flash device interface (8 & 16 bits) */
 707     pfl->cfi_table[0x28] = 0x02;
 708     pfl->cfi_table[0x29] = 0x00;
 709     /* Max number of bytes in multi-bytes write */
 710     /* XXX: disable buffered write as it's not supported */
 711     //    pfl->cfi_table[0x2A] = 0x05;
 712     pfl->cfi_table[0x2A] = 0x00;
 713     pfl->cfi_table[0x2B] = 0x00;
 714     /* Number of erase block regions (uniform) */
 715     pfl->cfi_table[0x2C] = 0x01;
 716     /* Erase block region 1 */
 717     pfl->cfi_table[0x2D] = nb_blocs - 1;
 718     pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8;
 719     pfl->cfi_table[0x2F] = sector_len >> 8;
 720     pfl->cfi_table[0x30] = sector_len >> 16;
 721
 722     /* Extended */
 723     pfl->cfi_table[0x31] = 'P';
 724     pfl->cfi_table[0x32] = 'R';
 725     pfl->cfi_table[0x33] = 'I';
 726
 727     pfl->cfi_table[0x34] = '1';
 728     pfl->cfi_table[0x35] = '0';
 729
 730     pfl->cfi_table[0x36] = 0x00;
 731     pfl->cfi_table[0x37] = 0x00;
 732     pfl->cfi_table[0x38] = 0x00;
 733     pfl->cfi_table[0x39] = 0x00;
 734
 735     pfl->cfi_table[0x3a] = 0x00;
 736
 737     pfl->cfi_table[0x3b] = 0x00;
 738     pfl->cfi_table[0x3c] = 0x00;
 739
 740     return pfl;
 741 }