hw/pflash_cfi01.c

   1 /*
   2  *  CFI parallel flash with Intel command set emulation
   3  *
   4  *  Copyright (c) 2006 Thorsten Zitterell
   5  *  Copyright (c) 2005 Jocelyn Mayer
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 /*
  22  * For now, this code can emulate flashes of 1, 2 or 4 bytes width.
  23  * Supported commands/modes are:
  24  * - flash read
  25  * - flash write
  26  * - flash ID read
  27  * - sector erase
  28  * - CFI queries
  29  *
  30  * It does not support timings
  31  * It does not support flash interleaving
  32  * It does not implement software data protection as found in many real chips
  33  * It does not implement erase suspend/resume commands
  34  * It does not implement multiple sectors erase
  35  *
  36  * It does not implement much more ...
  37  */
  38
  39 #include "hw.h"
  40 #include "flash.h"
  41 #include "block.h"
  42 #include "qemu-timer.h"
  43 #include "exec-memory.h"
  44 #include "host-utils.h"
  45
  46 #define PFLASH_BUG(fmt, ...) \
  47 do { \
  48     printf("PFLASH: Possible BUG - " fmt, ## __VA_ARGS__); \
  49     exit(1); \
  50 } while(0)
  51
  52 /* #define PFLASH_DEBUG */
  53 #ifdef PFLASH_DEBUG
  54 #define DPRINTF(fmt, ...)                          \
  55 do {                                               \
  56     printf("PFLASH: " fmt , ## __VA_ARGS__);       \
  57 } while (0)
  58 #else
  59 #define DPRINTF(fmt, ...) do { } while (0)
  60 #endif
  61
  62 struct pflash_t {
  63     BlockDriverState *bs;
  64     hwaddr base;
  65     hwaddr sector_len;
  66     hwaddr total_len;
  67     int width;
  68     int wcycle; /* if 0, the flash is read normally */
  69     int bypass;
  70     int ro;
  71     uint8_t cmd;
  72     uint8_t status;
  73     uint16_t ident[4];
  74     uint8_t cfi_len;
  75     uint8_t cfi_table[0x52];
  76     hwaddr counter;
  77     unsigned int writeblock_size;
  78     QEMUTimer *timer;
  79     MemoryRegion mem;
  80     void *storage;
  81 };
  82
  83 static void pflash_timer (void *opaque)
  84 {
  85     pflash_t *pfl = opaque;
  86
  87     DPRINTF("%s: command %02x done\n", __func__, pfl->cmd);
  88     /* Reset flash */
  89     pfl->status ^= 0x80;
  90     if (pfl->bypass) {
  91         pfl->wcycle = 2;
  92     } else {
  93         memory_region_rom_device_set_readable(&pfl->mem, true);
  94         pfl->wcycle = 0;
  95     }
  96     pfl->cmd = 0;
  97 }
  98
  99 static uint32_t pflash_read (pflash_t *pfl, hwaddr offset,
 100                              int width, int be)
 101 {
 102     hwaddr boff;
 103     uint32_t ret;
 104     uint8_t *p;
 105
 106     ret = -1;
 107     boff = offset & 0xFF; /* why this here ?? */
 108
 109     if (pfl->width == 2)
 110         boff = boff >> 1;
 111     else if (pfl->width == 4)
 112         boff = boff >> 2;
 113
 114 #if 0
 115     DPRINTF("%s: reading offset " TARGET_FMT_plx " under cmd %02x width %d\n",
 116             __func__, offset, pfl->cmd, width);
 117 #endif
 118     switch (pfl->cmd) {
 119     case 0x00:
 120         /* Flash area read */
 121         p = pfl->storage;
 122         switch (width) {
 123         case 1:
 124             ret = p[offset];
 125             DPRINTF("%s: data offset " TARGET_FMT_plx " %02x\n",
 126                     __func__, offset, ret);
 127             break;
 128         case 2:
 129             if (be) {
 130                 ret = p[offset] << 8;
 131                 ret |= p[offset + 1];
 132             } else {
 133                 ret = p[offset];
 134                 ret |= p[offset + 1] << 8;
 135             }
 136             DPRINTF("%s: data offset " TARGET_FMT_plx " %04x\n",
 137                     __func__, offset, ret);
 138             break;
 139         case 4:
 140             if (be) {
 141                 ret = p[offset] << 24;
 142                 ret |= p[offset + 1] << 16;
 143                 ret |= p[offset + 2] << 8;
 144                 ret |= p[offset + 3];
 145             } else {
 146                 ret = p[offset];
 147                 ret |= p[offset + 1] << 8;
 148                 ret |= p[offset + 2] << 16;
 149                 ret |= p[offset + 3] << 24;
 150             }
 151             DPRINTF("%s: data offset " TARGET_FMT_plx " %08x\n",
 152                     __func__, offset, ret);
 153             break;
 154         default:
 155             DPRINTF("BUG in %s\n", __func__);
 156         }
 157
 158         break;
 159     case 0x20: /* Block erase */
 160     case 0x50: /* Clear status register */
 161     case 0x60: /* Block /un)lock */
 162     case 0x70: /* Status Register */
 163     case 0xe8: /* Write block */
 164         /* Status register read */
 165         ret = pfl->status;
 166         DPRINTF("%s: status %x\n", __func__, ret);
 167         break;
 168     case 0x90:
 169         switch (boff) {
 170         case 0:
 171             ret = pfl->ident[0] << 8 | pfl->ident[1];
 172             DPRINTF("%s: Manufacturer Code %04x\n", __func__, ret);
 173             break;
 174         case 1:
 175             ret = pfl->ident[2] << 8 | pfl->ident[3];
 176             DPRINTF("%s: Device ID Code %04x\n", __func__, ret);
 177             break;
 178         default:
 179             DPRINTF("%s: Read Device Information boff=%x\n", __func__, boff);
 180             ret = 0;
 181             break;
 182         }
 183         break;
 184     case 0x98: /* Query mode */
 185         if (boff > pfl->cfi_len)
 186             ret = 0;
 187         else
 188             ret = pfl->cfi_table[boff];
 189         break;
 190     default:
 191         /* This should never happen : reset state & treat it as a read */
 192         DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
 193         pfl->wcycle = 0;
 194         pfl->cmd = 0;
 195     }
 196     return ret;
 197 }
 198
 199 /* update flash content on disk */
 200 static void pflash_update(pflash_t *pfl, int offset,
 201                           int size)
 202 {
 203     int offset_end;
 204     if (pfl->bs) {
 205         offset_end = offset + size;
 206         /* round to sectors */
 207         offset = offset >> 9;
 208         offset_end = (offset_end + 511) >> 9;
 209         bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
 210                    offset_end - offset);
 211     }
 212 }
 213
 214 static inline void pflash_data_write(pflash_t *pfl, hwaddr offset,
 215                                      uint32_t value, int width, int be)
 216 {
 217     uint8_t *p = pfl->storage;
 218
 219     DPRINTF("%s: block write offset " TARGET_FMT_plx
 220             " value %x counter " TARGET_FMT_plx "\n",
 221             __func__, offset, value, pfl->counter);
 222     switch (width) {
 223     case 1:
 224         p[offset] = value;
 225         break;
 226     case 2:
 227         if (be) {
 228             p[offset] = value >> 8;
 229             p[offset + 1] = value;
 230         } else {
 231             p[offset] = value;
 232             p[offset + 1] = value >> 8;
 233         }
 234         break;
 235     case 4:
 236         if (be) {
 237             p[offset] = value >> 24;
 238             p[offset + 1] = value >> 16;
 239             p[offset + 2] = value >> 8;
 240             p[offset + 3] = value;
 241         } else {
 242             p[offset] = value;
 243             p[offset + 1] = value >> 8;
 244             p[offset + 2] = value >> 16;
 245             p[offset + 3] = value >> 24;
 246         }
 247         break;
 248     }
 249
 250 }
 251
 252 static void pflash_write(pflash_t *pfl, hwaddr offset,
 253                          uint32_t value, int width, int be)
 254 {
 255     uint8_t *p;
 256     uint8_t cmd;
 257
 258     cmd = value;
 259
 260     DPRINTF("%s: writing offset " TARGET_FMT_plx " value %08x width %d wcycle 0x%x\n",
 261             __func__, offset, value, width, pfl->wcycle);
 262
 263     if (!pfl->wcycle) {
 264         /* Set the device in I/O access mode */
 265         memory_region_rom_device_set_readable(&pfl->mem, false);
 266     }
 267
 268     switch (pfl->wcycle) {
 269     case 0:
 270         /* read mode */
 271         switch (cmd) {
 272         case 0x00: /* ??? */
 273             goto reset_flash;
 274         case 0x10: /* Single Byte Program */
 275         case 0x40: /* Single Byte Program */
 276             DPRINTF("%s: Single Byte Program\n", __func__);
 277             break;
 278         case 0x20: /* Block erase */
 279             p = pfl->storage;
 280             offset &= ~(pfl->sector_len - 1);
 281
 282             DPRINTF("%s: block erase at " TARGET_FMT_plx " bytes "
 283                     TARGET_FMT_plx "\n",
 284                     __func__, offset, pfl->sector_len);
 285
 286             if (!pfl->ro) {
 287                 memset(p + offset, 0xff, pfl->sector_len);
 288                 pflash_update(pfl, offset, pfl->sector_len);
 289             } else {
 290                 pfl->status |= 0x20; /* Block erase error */
 291             }
 292             pfl->status |= 0x80; /* Ready! */
 293             break;
 294         case 0x50: /* Clear status bits */
 295             DPRINTF("%s: Clear status bits\n", __func__);
 296             pfl->status = 0x0;
 297             goto reset_flash;
 298         case 0x60: /* Block (un)lock */
 299             DPRINTF("%s: Block unlock\n", __func__);
 300             break;
 301         case 0x70: /* Status Register */
 302             DPRINTF("%s: Read status register\n", __func__);
 303             pfl->cmd = cmd;
 304             return;
 305         case 0x90: /* Read Device ID */
 306             DPRINTF("%s: Read Device information\n", __func__);
 307             pfl->cmd = cmd;
 308             return;
 309         case 0x98: /* CFI query */
 310             DPRINTF("%s: CFI query\n", __func__);
 311             break;
 312         case 0xe8: /* Write to buffer */
 313             DPRINTF("%s: Write to buffer\n", __func__);
 314             pfl->status |= 0x80; /* Ready! */
 315             break;
 316         case 0xff: /* Read array mode */
 317             DPRINTF("%s: Read array mode\n", __func__);
 318             goto reset_flash;
 319         default:
 320             goto error_flash;
 321         }
 322         pfl->wcycle++;
 323         pfl->cmd = cmd;
 324         break;
 325     case 1:
 326         switch (pfl->cmd) {
 327         case 0x10: /* Single Byte Program */
 328         case 0x40: /* Single Byte Program */
 329             DPRINTF("%s: Single Byte Program\n", __func__);
 330             if (!pfl->ro) {
 331                 pflash_data_write(pfl, offset, value, width, be);
 332                 pflash_update(pfl, offset, width);
 333             } else {
 334                 pfl->status |= 0x10; /* Programming error */
 335             }
 336             pfl->status |= 0x80; /* Ready! */
 337             pfl->wcycle = 0;
 338         break;
 339         case 0x20: /* Block erase */
 340         case 0x28:
 341             if (cmd == 0xd0) { /* confirm */
 342                 pfl->wcycle = 0;
 343                 pfl->status |= 0x80;
 344             } else if (cmd == 0xff) { /* read array mode */
 345                 goto reset_flash;
 346             } else
 347                 goto error_flash;
 348
 349             break;
 350         case 0xe8:
 351             DPRINTF("%s: block write of %x bytes\n", __func__, value);
 352             pfl->counter = value;
 353             pfl->wcycle++;
 354             break;
 355         case 0x60:
 356             if (cmd == 0xd0) {
 357                 pfl->wcycle = 0;
 358                 pfl->status |= 0x80;
 359             } else if (cmd == 0x01) {
 360                 pfl->wcycle = 0;
 361                 pfl->status |= 0x80;
 362             } else if (cmd == 0xff) {
 363                 goto reset_flash;
 364             } else {
 365                 DPRINTF("%s: Unknown (un)locking command\n", __func__);
 366                 goto reset_flash;
 367             }
 368             break;
 369         case 0x98:
 370             if (cmd == 0xff) {
 371                 goto reset_flash;
 372             } else {
 373                 DPRINTF("%s: leaving query mode\n", __func__);
 374             }
 375             break;
 376         default:
 377             goto error_flash;
 378         }
 379         break;
 380     case 2:
 381         switch (pfl->cmd) {
 382         case 0xe8: /* Block write */
 383             if (!pfl->ro) {
 384                 pflash_data_write(pfl, offset, value, width, be);
 385             } else {
 386                 pfl->status |= 0x10; /* Programming error */
 387             }
 388
 389             pfl->status |= 0x80;
 390
 391             if (!pfl->counter) {
 392                 hwaddr mask = pfl->writeblock_size - 1;
 393                 mask = ~mask;
 394
 395                 DPRINTF("%s: block write finished\n", __func__);
 396                 pfl->wcycle++;
 397                 if (!pfl->ro) {
 398                     /* Flush the entire write buffer onto backing storage.  */
 399                     pflash_update(pfl, offset & mask, pfl->writeblock_size);
 400                 } else {
 401                     pfl->status |= 0x10; /* Programming error */
 402                 }
 403             }
 404
 405             pfl->counter--;
 406             break;
 407         default:
 408             goto error_flash;
 409         }
 410         break;
 411     case 3: /* Confirm mode */
 412         switch (pfl->cmd) {
 413         case 0xe8: /* Block write */
 414             if (cmd == 0xd0) {
 415                 pfl->wcycle = 0;
 416                 pfl->status |= 0x80;
 417             } else {
 418                 DPRINTF("%s: unknown command for \"write block\"\n", __func__);
 419                 PFLASH_BUG("Write block confirm");
 420                 goto reset_flash;
 421             }
 422             break;
 423         default:
 424             goto error_flash;
 425         }
 426         break;
 427     default:
 428         /* Should never happen */
 429         DPRINTF("%s: invalid write state\n",  __func__);
 430         goto reset_flash;
 431     }
 432     return;
 433
 434  error_flash:
 435     printf("%s: Unimplemented flash cmd sequence "
 436            "(offset " TARGET_FMT_plx ", wcycle 0x%x cmd 0x%x value 0x%x)\n",
 437            __func__, offset, pfl->wcycle, pfl->cmd, value);
 438
 439  reset_flash:
 440     memory_region_rom_device_set_readable(&pfl->mem, true);
 441
 442     pfl->bypass = 0;
 443     pfl->wcycle = 0;
 444     pfl->cmd = 0;
 445 }
 446
 447
 448 static uint32_t pflash_readb_be(void *opaque, hwaddr addr)
 449 {
 450     return pflash_read(opaque, addr, 1, 1);
 451 }
 452
 453 static uint32_t pflash_readb_le(void *opaque, hwaddr addr)
 454 {
 455     return pflash_read(opaque, addr, 1, 0);
 456 }
 457
 458 static uint32_t pflash_readw_be(void *opaque, hwaddr addr)
 459 {
 460     pflash_t *pfl = opaque;
 461
 462     return pflash_read(pfl, addr, 2, 1);
 463 }
 464
 465 static uint32_t pflash_readw_le(void *opaque, hwaddr addr)
 466 {
 467     pflash_t *pfl = opaque;
 468
 469     return pflash_read(pfl, addr, 2, 0);
 470 }
 471
 472 static uint32_t pflash_readl_be(void *opaque, hwaddr addr)
 473 {
 474     pflash_t *pfl = opaque;
 475
 476     return pflash_read(pfl, addr, 4, 1);
 477 }
 478
 479 static uint32_t pflash_readl_le(void *opaque, hwaddr addr)
 480 {
 481     pflash_t *pfl = opaque;
 482
 483     return pflash_read(pfl, addr, 4, 0);
 484 }
 485
 486 static void pflash_writeb_be(void *opaque, hwaddr addr,
 487                              uint32_t value)
 488 {
 489     pflash_write(opaque, addr, value, 1, 1);
 490 }
 491
 492 static void pflash_writeb_le(void *opaque, hwaddr addr,
 493                              uint32_t value)
 494 {
 495     pflash_write(opaque, addr, value, 1, 0);
 496 }
 497
 498 static void pflash_writew_be(void *opaque, hwaddr addr,
 499                              uint32_t value)
 500 {
 501     pflash_t *pfl = opaque;
 502
 503     pflash_write(pfl, addr, value, 2, 1);
 504 }
 505
 506 static void pflash_writew_le(void *opaque, hwaddr addr,
 507                              uint32_t value)
 508 {
 509     pflash_t *pfl = opaque;
 510
 511     pflash_write(pfl, addr, value, 2, 0);
 512 }
 513
 514 static void pflash_writel_be(void *opaque, hwaddr addr,
 515                              uint32_t value)
 516 {
 517     pflash_t *pfl = opaque;
 518
 519     pflash_write(pfl, addr, value, 4, 1);
 520 }
 521
 522 static void pflash_writel_le(void *opaque, hwaddr addr,
 523                              uint32_t value)
 524 {
 525     pflash_t *pfl = opaque;
 526
 527     pflash_write(pfl, addr, value, 4, 0);
 528 }
 529
 530 static const MemoryRegionOps pflash_cfi01_ops_be = {
 531     .old_mmio = {
 532         .read = { pflash_readb_be, pflash_readw_be, pflash_readl_be, },
 533         .write = { pflash_writeb_be, pflash_writew_be, pflash_writel_be, },
 534     },
 535     .endianness = DEVICE_NATIVE_ENDIAN,
 536 };
 537
 538 static const MemoryRegionOps pflash_cfi01_ops_le = {
 539     .old_mmio = {
 540         .read = { pflash_readb_le, pflash_readw_le, pflash_readl_le, },
 541         .write = { pflash_writeb_le, pflash_writew_le, pflash_writel_le, },
 542     },
 543     .endianness = DEVICE_NATIVE_ENDIAN,
 544 };
 545
 546 pflash_t *pflash_cfi01_register(hwaddr base,
 547                                 DeviceState *qdev, const char *name,
 548                                 hwaddr size,
 549                                 BlockDriverState *bs, uint32_t sector_len,
 550                                 int nb_blocs, int width,
 551                                 uint16_t id0, uint16_t id1,
 552                                 uint16_t id2, uint16_t id3, int be)
 553 {
 554     pflash_t *pfl;
 555     hwaddr total_len;
 556     int ret;
 557
 558     total_len = sector_len * nb_blocs;
 559
 560     /* XXX: to be fixed */
 561 #if 0
 562     if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
 563         total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
 564         return NULL;
 565 #endif
 566
 567     pfl = g_malloc0(sizeof(pflash_t));
 568
 569     memory_region_init_rom_device(
 570         &pfl->mem, be ? &pflash_cfi01_ops_be : &pflash_cfi01_ops_le, pfl,
 571         name, size);
 572     vmstate_register_ram(&pfl->mem, qdev);
 573     pfl->storage = memory_region_get_ram_ptr(&pfl->mem);
 574     memory_region_add_subregion(get_system_memory(), base, &pfl->mem);
 575
 576     pfl->bs = bs;
 577     if (pfl->bs) {
 578         /* read the initial flash content */
 579         ret = bdrv_read(pfl->bs, 0, pfl->storage, total_len >> 9);
 580         if (ret < 0) {
 581             memory_region_del_subregion(get_system_memory(), &pfl->mem);
 582             vmstate_unregister_ram(&pfl->mem, qdev);
 583             memory_region_destroy(&pfl->mem);
 584             g_free(pfl);
 585             return NULL;
 586         }
 587         bdrv_attach_dev_nofail(pfl->bs, pfl);
 588     }
 589
 590     if (pfl->bs) {
 591         pfl->ro = bdrv_is_read_only(pfl->bs);
 592     } else {
 593         pfl->ro = 0;
 594     }
 595
 596     pfl->timer = qemu_new_timer_ns(vm_clock, pflash_timer, pfl);
 597     pfl->base = base;
 598     pfl->sector_len = sector_len;
 599     pfl->total_len = total_len;
 600     pfl->width = width;
 601     pfl->wcycle = 0;
 602     pfl->cmd = 0;
 603     pfl->status = 0;
 604     pfl->ident[0] = id0;
 605     pfl->ident[1] = id1;
 606     pfl->ident[2] = id2;
 607     pfl->ident[3] = id3;
 608     /* Hardcoded CFI table */
 609     pfl->cfi_len = 0x52;
 610     /* Standard "QRY" string */
 611     pfl->cfi_table[0x10] = 'Q';
 612     pfl->cfi_table[0x11] = 'R';
 613     pfl->cfi_table[0x12] = 'Y';
 614     /* Command set (Intel) */
 615     pfl->cfi_table[0x13] = 0x01;
 616     pfl->cfi_table[0x14] = 0x00;
 617     /* Primary extended table address (none) */
 618     pfl->cfi_table[0x15] = 0x31;
 619     pfl->cfi_table[0x16] = 0x00;
 620     /* Alternate command set (none) */
 621     pfl->cfi_table[0x17] = 0x00;
 622     pfl->cfi_table[0x18] = 0x00;
 623     /* Alternate extended table (none) */
 624     pfl->cfi_table[0x19] = 0x00;
 625     pfl->cfi_table[0x1A] = 0x00;
 626     /* Vcc min */
 627     pfl->cfi_table[0x1B] = 0x45;
 628     /* Vcc max */
 629     pfl->cfi_table[0x1C] = 0x55;
 630     /* Vpp min (no Vpp pin) */
 631     pfl->cfi_table[0x1D] = 0x00;
 632     /* Vpp max (no Vpp pin) */
 633     pfl->cfi_table[0x1E] = 0x00;
 634     /* Reserved */
 635     pfl->cfi_table[0x1F] = 0x07;
 636     /* Timeout for min size buffer write */
 637     pfl->cfi_table[0x20] = 0x07;
 638     /* Typical timeout for block erase */
 639     pfl->cfi_table[0x21] = 0x0a;
 640     /* Typical timeout for full chip erase (4096 ms) */
 641     pfl->cfi_table[0x22] = 0x00;
 642     /* Reserved */
 643     pfl->cfi_table[0x23] = 0x04;
 644     /* Max timeout for buffer write */
 645     pfl->cfi_table[0x24] = 0x04;
 646     /* Max timeout for block erase */
 647     pfl->cfi_table[0x25] = 0x04;
 648     /* Max timeout for chip erase */
 649     pfl->cfi_table[0x26] = 0x00;
 650     /* Device size */
 651     pfl->cfi_table[0x27] = ctz32(total_len); // + 1;
 652     /* Flash device interface (8 & 16 bits) */
 653     pfl->cfi_table[0x28] = 0x02;
 654     pfl->cfi_table[0x29] = 0x00;
 655     /* Max number of bytes in multi-bytes write */
 656     if (width == 1) {
 657         pfl->cfi_table[0x2A] = 0x08;
 658     } else {
 659         pfl->cfi_table[0x2A] = 0x0B;
 660     }
 661     pfl->writeblock_size = 1 << pfl->cfi_table[0x2A];
 662
 663     pfl->cfi_table[0x2B] = 0x00;
 664     /* Number of erase block regions (uniform) */
 665     pfl->cfi_table[0x2C] = 0x01;
 666     /* Erase block region 1 */
 667     pfl->cfi_table[0x2D] = nb_blocs - 1;
 668     pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8;
 669     pfl->cfi_table[0x2F] = sector_len >> 8;
 670     pfl->cfi_table[0x30] = sector_len >> 16;
 671
 672     /* Extended */
 673     pfl->cfi_table[0x31] = 'P';
 674     pfl->cfi_table[0x32] = 'R';
 675     pfl->cfi_table[0x33] = 'I';
 676
 677     pfl->cfi_table[0x34] = '1';
 678     pfl->cfi_table[0x35] = '0';
 679
 680     pfl->cfi_table[0x36] = 0x00;
 681     pfl->cfi_table[0x37] = 0x00;
 682     pfl->cfi_table[0x38] = 0x00;
 683     pfl->cfi_table[0x39] = 0x00;
 684
 685     pfl->cfi_table[0x3a] = 0x00;
 686
 687     pfl->cfi_table[0x3b] = 0x00;
 688     pfl->cfi_table[0x3c] = 0x00;
 689
 690     pfl->cfi_table[0x3f] = 0x01; /* Number of protection fields */
 691
 692     return pfl;
 693 }
 694
 695 MemoryRegion *pflash_cfi01_get_memory(pflash_t *fl)
 696 {
 697     return &fl->mem;
 698 }