board/freescale/common/sys_eeprom.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2006, 2008-2009, 2011 Freescale Semiconductor
   4  * York Sun (yorksun@freescale.com)
   5  * Haiying Wang (haiying.wang@freescale.com)
   6  * Timur Tabi (timur@freescale.com)
   7  */
   8
   9 #include <common.h>
  10 #include <command.h>
  11 #include <env.h>
  12 #include <i2c.h>
  13 #include <linux/ctype.h>
  14
  15 #ifdef CONFIG_SYS_I2C_EEPROM_CCID
  16 #include "../common/eeprom.h"
  17 #define MAX_NUM_PORTS   8
  18 #endif
  19
  20 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
  21 /* some boards with non-256-bytes EEPROM have special define */
  22 /* for MAX_NUM_PORTS in board-specific file */
  23 #ifndef MAX_NUM_PORTS
  24 #define MAX_NUM_PORTS   16
  25 #endif
  26 #define NXID_VERSION    1
  27 #endif
  28
  29 /**
  30  * static eeprom: EEPROM layout for CCID or NXID formats
  31  *
  32  * See application note AN3638 for details.
  33  */
  34 static struct __attribute__ ((__packed__)) eeprom {
  35 #ifdef CONFIG_SYS_I2C_EEPROM_CCID
  36         u8 id[4];         /* 0x00 - 0x03 EEPROM Tag 'CCID' */
  37         u8 major;         /* 0x04        Board revision, major */
  38         u8 minor;         /* 0x05        Board revision, minor */
  39         u8 sn[10];        /* 0x06 - 0x0F Serial Number*/
  40         u8 errata[2];     /* 0x10 - 0x11 Errata Level */
  41         u8 date[6];       /* 0x12 - 0x17 Build Date */
  42         u8 res_0[40];     /* 0x18 - 0x3f Reserved */
  43         u8 mac_count;     /* 0x40        Number of MAC addresses */
  44         u8 mac_flag;      /* 0x41        MAC table flags */
  45         u8 mac[MAX_NUM_PORTS][6];     /* 0x42 - 0x71 MAC addresses */
  46         u32 crc;          /* 0x72        CRC32 checksum */
  47 #endif
  48 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
  49         u8 id[4];         /* 0x00 - 0x03 EEPROM Tag 'NXID' */
  50         u8 sn[12];        /* 0x04 - 0x0F Serial Number */
  51         u8 errata[5];     /* 0x10 - 0x14 Errata Level */
  52         u8 date[6];       /* 0x15 - 0x1a Build Date */
  53         u8 res_0;         /* 0x1b        Reserved */
  54         u32 version;      /* 0x1c - 0x1f NXID Version */
  55         u8 tempcal[8];    /* 0x20 - 0x27 Temperature Calibration Factors */
  56         u8 tempcalsys[2]; /* 0x28 - 0x29 System Temperature Calibration Factors */
  57         u8 tempcalflags;  /* 0x2a        Temperature Calibration Flags */
  58         u8 res_1[21];     /* 0x2b - 0x3f Reserved */
  59         u8 mac_count;     /* 0x40        Number of MAC addresses */
  60         u8 mac_flag;      /* 0x41        MAC table flags */
  61         u8 mac[MAX_NUM_PORTS][6];     /* 0x42 - 0xa1 MAC addresses */
  62         u8 res_2[90];     /* 0xa2 - 0xfb Reserved */
  63         u32 crc;          /* 0xfc - 0xff CRC32 checksum */
  64 #endif
  65 } e;
  66
  67 /* Set to 1 if we've read EEPROM into memory */
  68 static int has_been_read = 0;
  69
  70 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
  71 /* Is this a valid NXID EEPROM? */
  72 #define is_valid ((e.id[0] == 'N') || (e.id[1] == 'X') || \
  73                   (e.id[2] == 'I') || (e.id[3] == 'D'))
  74 #endif
  75
  76 #ifdef CONFIG_SYS_I2C_EEPROM_CCID
  77 /* Is this a valid CCID EEPROM? */
  78 #define is_valid ((e.id[0] == 'C') || (e.id[1] == 'C') || \
  79                   (e.id[2] == 'I') || (e.id[3] == 'D'))
  80 #endif
  81
  82 /**
  83  * show_eeprom - display the contents of the EEPROM
  84  */
  85 static void show_eeprom(void)
  86 {
  87         int i;
  88         unsigned int crc;
  89
  90         /* EEPROM tag ID, either CCID or NXID */
  91 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
  92         printf("ID: %c%c%c%c v%u\n", e.id[0], e.id[1], e.id[2], e.id[3],
  93                be32_to_cpu(e.version));
  94 #else
  95         printf("ID: %c%c%c%c\n", e.id[0], e.id[1], e.id[2], e.id[3]);
  96 #endif
  97
  98         /* Serial number */
  99         printf("SN: %s\n", e.sn);
 100
 101         /* Errata level. */
 102 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
 103         printf("Errata: %s\n", e.errata);
 104 #else
 105         printf("Errata: %c%c\n",
 106                 e.errata[0] ? e.errata[0] : '.',
 107                 e.errata[1] ? e.errata[1] : '.');
 108 #endif
 109
 110         /* Build date, BCD date values, as YYMMDDhhmmss */
 111         printf("Build date: 20%02x/%02x/%02x %02x:%02x:%02x %s\n",
 112                 e.date[0], e.date[1], e.date[2],
 113                 e.date[3] & 0x7F, e.date[4], e.date[5],
 114                 e.date[3] & 0x80 ? "PM" : "");
 115
 116         /* Show MAC addresses  */
 117         for (i = 0; i < min(e.mac_count, (u8)MAX_NUM_PORTS); i++) {
 118
 119                 u8 *p = e.mac[i];
 120
 121                 printf("Eth%u: %02x:%02x:%02x:%02x:%02x:%02x\n", i,
 122                         p[0], p[1], p[2], p[3], p[4], p[5]);
 123         }
 124
 125         crc = crc32(0, (void *)&e, sizeof(e) - 4);
 126
 127         if (crc == be32_to_cpu(e.crc))
 128                 printf("CRC: %08x\n", be32_to_cpu(e.crc));
 129         else
 130                 printf("CRC: %08x (should be %08x)\n",
 131                         be32_to_cpu(e.crc), crc);
 132
 133 #ifdef DEBUG
 134         printf("EEPROM dump: (0x%x bytes)\n", sizeof(e));
 135         for (i = 0; i < sizeof(e); i++) {
 136                 if ((i % 16) == 0)
 137                         printf("%02X: ", i);
 138                 printf("%02X ", ((u8 *)&e)[i]);
 139                 if (((i % 16) == 15) || (i == sizeof(e) - 1))
 140                         printf("\n");
 141         }
 142 #endif
 143 }
 144
 145 /**
 146  * read_eeprom - read the EEPROM into memory
 147  */
 148 static int read_eeprom(void)
 149 {
 150         int ret;
 151 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 152 #ifndef CONFIG_DM_I2C
 153         unsigned int bus;
 154 #endif
 155 #endif
 156
 157         if (has_been_read)
 158                 return 0;
 159
 160 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 161 #ifndef CONFIG_DM_I2C
 162         bus = i2c_get_bus_num();
 163         i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
 164 #endif
 165 #endif
 166
 167 #ifndef CONFIG_DM_I2C
 168         ret = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
 169                        CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
 170                        (void *)&e, sizeof(e));
 171 #else
 172         struct udevice *dev;
 173 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 174         ret = i2c_get_chip_for_busnum(CONFIG_SYS_EEPROM_BUS_NUM,
 175                                       CONFIG_SYS_I2C_EEPROM_ADDR, 1, &dev);
 176 #else
 177         ret = i2c_get_chip_for_busnum(0, CONFIG_SYS_I2C_EEPROM_ADDR, 1, &dev);
 178 #endif
 179         if (!ret)
 180                 ret = dm_i2c_read(dev, 0, (void *)&e, sizeof(e));
 181 #endif
 182
 183 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 184 #ifndef CONFIG_DM_I2C
 185         i2c_set_bus_num(bus);
 186 #endif
 187 #endif
 188
 189 #ifdef DEBUG
 190         show_eeprom();
 191 #endif
 192
 193         has_been_read = (ret == 0) ? 1 : 0;
 194
 195         return ret;
 196 }
 197
 198 /**
 199  *  update_crc - update the CRC
 200  *
 201  *  This function should be called after each update to the EEPROM structure,
 202  *  to make sure the CRC is always correct.
 203  */
 204 static void update_crc(void)
 205 {
 206         u32 crc;
 207
 208         crc = crc32(0, (void *)&e, sizeof(e) - 4);
 209         e.crc = cpu_to_be32(crc);
 210 }
 211
 212 /**
 213  * prog_eeprom - write the EEPROM from memory
 214  */
 215 static int prog_eeprom(void)
 216 {
 217         int ret = 0;
 218         int i;
 219         void *p;
 220 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 221 #ifndef CONFIG_DM_I2C
 222         unsigned int bus;
 223 #endif
 224 #endif
 225
 226         /* Set the reserved values to 0xFF   */
 227 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
 228         e.res_0 = 0xFF;
 229         memset(e.res_1, 0xFF, sizeof(e.res_1));
 230 #else
 231         memset(e.res_0, 0xFF, sizeof(e.res_0));
 232 #endif
 233         update_crc();
 234
 235 #ifndef CONFIG_DM_I2C
 236 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 237         bus = i2c_get_bus_num();
 238         i2c_set_bus_num(CONFIG_SYS_EEPROM_BUS_NUM);
 239 #endif
 240 #endif
 241
 242         /*
 243          * The AT24C02 datasheet says that data can only be written in page
 244          * mode, which means 8 bytes at a time, and it takes up to 5ms to
 245          * complete a given write.
 246          */
 247         for (i = 0, p = &e; i < sizeof(e); i += 8, p += 8) {
 248 #ifndef CONFIG_DM_I2C
 249                 ret = i2c_write(CONFIG_SYS_I2C_EEPROM_ADDR, i,
 250                                 CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
 251                                 p, min((int)(sizeof(e) - i), 8));
 252 #else
 253                 struct udevice *dev;
 254 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 255                 ret = i2c_get_chip_for_busnum(CONFIG_SYS_EEPROM_BUS_NUM,
 256                                               CONFIG_SYS_I2C_EEPROM_ADDR,
 257                                               CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
 258                                               &dev);
 259 #else
 260                 ret = i2c_get_chip_for_busnum(0, CONFIG_SYS_I2C_EEPROM_ADDR,
 261                                               CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
 262                                               &dev);
 263 #endif
 264                 if (!ret)
 265                         ret = dm_i2c_write(dev, i, p, min((int)(sizeof(e) - i),
 266                                                           8));
 267 #endif
 268                 if (ret)
 269                         break;
 270                 udelay(5000);   /* 5ms write cycle timing */
 271         }
 272
 273         if (!ret) {
 274                 /* Verify the write by reading back the EEPROM and comparing */
 275                 struct eeprom e2;
 276
 277 #ifndef CONFIG_DM_I2C
 278                 ret = i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0,
 279                                CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
 280                                (void *)&e2, sizeof(e2));
 281 #else
 282                 struct udevice *dev;
 283 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 284                 ret = i2c_get_chip_for_busnum(CONFIG_SYS_EEPROM_BUS_NUM,
 285                                               CONFIG_SYS_I2C_EEPROM_ADDR,
 286                                               CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
 287                                               &dev);
 288 #else
 289                 ret = i2c_get_chip_for_busnum(0, CONFIG_SYS_I2C_EEPROM_ADDR,
 290                                               CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
 291                                               &dev);
 292 #endif
 293                 if (!ret)
 294                         ret = dm_i2c_read(dev, 0, (void *)&e2, sizeof(e2));
 295 #endif
 296                 if (!ret && memcmp(&e, &e2, sizeof(e)))
 297                         ret = -1;
 298         }
 299
 300 #ifndef CONFIG_DM_I2C
 301 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 302         i2c_set_bus_num(bus);
 303 #endif
 304 #endif
 305
 306         if (ret) {
 307                 printf("Programming failed.\n");
 308                 has_been_read = 0;
 309                 return -1;
 310         }
 311
 312         printf("Programming passed.\n");
 313         return 0;
 314 }
 315
 316 /**
 317  * h2i - converts hex character into a number
 318  *
 319  * This function takes a hexadecimal character (e.g. '7' or 'C') and returns
 320  * the integer equivalent.
 321  */
 322 static inline u8 h2i(char p)
 323 {
 324         if ((p >= '0') && (p <= '9'))
 325                 return p - '0';
 326
 327         if ((p >= 'A') && (p <= 'F'))
 328                 return (p - 'A') + 10;
 329
 330         if ((p >= 'a') && (p <= 'f'))
 331                 return (p - 'a') + 10;
 332
 333         return 0;
 334 }
 335
 336 /**
 337  * set_date - stores the build date into the EEPROM
 338  *
 339  * This function takes a pointer to a string in the format "YYMMDDhhmmss"
 340  * (2-digit year, 2-digit month, etc), converts it to a 6-byte BCD string,
 341  * and stores it in the build date field of the EEPROM local copy.
 342  */
 343 static void set_date(const char *string)
 344 {
 345         unsigned int i;
 346
 347         if (strlen(string) != 12) {
 348                 printf("Usage: mac date YYMMDDhhmmss\n");
 349                 return;
 350         }
 351
 352         for (i = 0; i < 6; i++)
 353                 e.date[i] = h2i(string[2 * i]) << 4 | h2i(string[2 * i + 1]);
 354
 355         update_crc();
 356 }
 357
 358 /**
 359  * set_mac_address - stores a MAC address into the EEPROM
 360  *
 361  * This function takes a pointer to MAC address string
 362  * (i.e."XX:XX:XX:XX:XX:XX", where "XX" is a two-digit hex number) and
 363  * stores it in one of the MAC address fields of the EEPROM local copy.
 364  */
 365 static void set_mac_address(unsigned int index, const char *string)
 366 {
 367         char *p = (char *) string;
 368         unsigned int i;
 369
 370         if ((index >= MAX_NUM_PORTS) || !string) {
 371                 printf("Usage: mac <n> XX:XX:XX:XX:XX:XX\n");
 372                 return;
 373         }
 374
 375         for (i = 0; *p && (i < 6); i++) {
 376                 e.mac[index][i] = simple_strtoul(p, &p, 16);
 377                 if (*p == ':')
 378                         p++;
 379         }
 380
 381         update_crc();
 382 }
 383
 384 int do_mac(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 385 {
 386         char cmd;
 387
 388         if (argc == 1) {
 389                 show_eeprom();
 390                 return 0;
 391         }
 392
 393         cmd = argv[1][0];
 394
 395         if (cmd == 'r') {
 396                 read_eeprom();
 397                 return 0;
 398         }
 399
 400         if (cmd == 'i') {
 401 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
 402                 memcpy(e.id, "NXID", sizeof(e.id));
 403                 e.version = cpu_to_be32(NXID_VERSION);
 404 #else
 405                 memcpy(e.id, "CCID", sizeof(e.id));
 406 #endif
 407                 update_crc();
 408                 return 0;
 409         }
 410
 411         if (!is_valid) {
 412                 printf("Please read the EEPROM ('r') and/or set the ID ('i') first.\n");
 413                 return 0;
 414         }
 415
 416         if (argc == 2) {
 417                 switch (cmd) {
 418                 case 's':       /* save */
 419                         prog_eeprom();
 420                         break;
 421                 default:
 422                         return cmd_usage(cmdtp);
 423                 }
 424
 425                 return 0;
 426         }
 427
 428         /* We know we have at least one parameter  */
 429
 430         switch (cmd) {
 431         case 'n':       /* serial number */
 432                 memset(e.sn, 0, sizeof(e.sn));
 433                 strncpy((char *)e.sn, argv[2], sizeof(e.sn) - 1);
 434                 update_crc();
 435                 break;
 436         case 'e':       /* errata */
 437 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
 438                 memset(e.errata, 0, 5);
 439                 strncpy((char *)e.errata, argv[2], 4);
 440 #else
 441                 e.errata[0] = argv[2][0];
 442                 e.errata[1] = argv[2][1];
 443 #endif
 444                 update_crc();
 445                 break;
 446         case 'd':       /* date BCD format YYMMDDhhmmss */
 447                 set_date(argv[2]);
 448                 break;
 449         case 'p':       /* MAC table size */
 450                 e.mac_count = simple_strtoul(argv[2], NULL, 16);
 451                 update_crc();
 452                 break;
 453         case '0' ... '9':       /* "mac 0" through "mac 22" */
 454                 set_mac_address(simple_strtoul(argv[1], NULL, 10), argv[2]);
 455                 break;
 456         case 'h':       /* help */
 457         default:
 458                 return cmd_usage(cmdtp);
 459         }
 460
 461         return 0;
 462 }
 463
 464 /**
 465  * mac_read_from_eeprom - read the MAC addresses from EEPROM
 466  *
 467  * This function reads the MAC addresses from EEPROM and sets the
 468  * appropriate environment variables for each one read.
 469  *
 470  * The environment variables are only set if they haven't been set already.
 471  * This ensures that any user-saved variables are never overwritten.
 472  *
 473  * This function must be called after relocation.
 474  *
 475  * For NXID v1 EEPROMs, we support loading and up-converting the older NXID v0
 476  * format.  In a v0 EEPROM, there are only eight MAC addresses and the CRC is
 477  * located at a different offset.
 478  */
 479 int mac_read_from_eeprom(void)
 480 {
 481         unsigned int i;
 482         u32 crc, crc_offset = offsetof(struct eeprom, crc);
 483         u32 *crcp; /* Pointer to the CRC in the data read from the EEPROM */
 484
 485         puts("EEPROM: ");
 486
 487         if (read_eeprom()) {
 488                 printf("Read failed.\n");
 489                 return 0;
 490         }
 491
 492         if (!is_valid) {
 493                 printf("Invalid ID (%02x %02x %02x %02x)\n",
 494                        e.id[0], e.id[1], e.id[2], e.id[3]);
 495                 return 0;
 496         }
 497
 498 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
 499         /*
 500          * If we've read an NXID v0 EEPROM, then we need to set the CRC offset
 501          * to where it is in v0.
 502          */
 503         if (e.version == 0)
 504                 crc_offset = 0x72;
 505 #endif
 506
 507         crc = crc32(0, (void *)&e, crc_offset);
 508         crcp = (void *)&e + crc_offset;
 509         if (crc != be32_to_cpu(*crcp)) {
 510                 printf("CRC mismatch (%08x != %08x)\n", crc, be32_to_cpu(e.crc));
 511                 return 0;
 512         }
 513
 514 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
 515         /*
 516          * MAC address #9 in v1 occupies the same position as the CRC in v0.
 517          * Erase it so that it's not mistaken for a MAC address.  We'll
 518          * update the CRC later.
 519          */
 520         if (e.version == 0)
 521                 memset(e.mac[8], 0xff, 6);
 522 #endif
 523
 524         for (i = 0; i < min(e.mac_count, (u8)MAX_NUM_PORTS); i++) {
 525                 if (memcmp(&e.mac[i], "\0\0\0\0\0\0", 6) &&
 526                     memcmp(&e.mac[i], "\xFF\xFF\xFF\xFF\xFF\xFF", 6)) {
 527                         char ethaddr[18];
 528                         char enetvar[9];
 529
 530                         sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
 531                                 e.mac[i][0],
 532                                 e.mac[i][1],
 533                                 e.mac[i][2],
 534                                 e.mac[i][3],
 535                                 e.mac[i][4],
 536                                 e.mac[i][5]);
 537                         sprintf(enetvar, i ? "eth%daddr" : "ethaddr", i);
 538                         /* Only initialize environment variables that are blank
 539                          * (i.e. have not yet been set)
 540                          */
 541                         if (!env_get(enetvar))
 542                                 env_set(enetvar, ethaddr);
 543                 }
 544         }
 545
 546 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
 547         printf("%c%c%c%c v%u\n", e.id[0], e.id[1], e.id[2], e.id[3],
 548                be32_to_cpu(e.version));
 549 #else
 550         printf("%c%c%c%c\n", e.id[0], e.id[1], e.id[2], e.id[3]);
 551 #endif
 552
 553 #ifdef CONFIG_SYS_I2C_EEPROM_NXID
 554         /*
 555          * Now we need to upconvert the data into v1 format.  We do this last so
 556          * that at boot time, U-Boot will still say "NXID v0".
 557          */
 558         if (e.version == 0) {
 559                 e.version = cpu_to_be32(NXID_VERSION);
 560                 update_crc();
 561         }
 562 #endif
 563
 564         return 0;
 565 }
 566
 567 #ifdef CONFIG_SYS_I2C_EEPROM_CCID
 568
 569 /**
 570  * get_cpu_board_revision - get the CPU board revision on 85xx boards
 571  *
 572  * Read the EEPROM to determine the board revision.
 573  *
 574  * This function is called before relocation, so we need to read a private
 575  * copy of the EEPROM into a local variable on the stack.
 576  *
 577  * Also, we assume that CONFIG_SYS_EEPROM_BUS_NUM == CONFIG_SYS_SPD_BUS_NUM.  The global
 578  * variable i2c_bus_num must be compile-time initialized to CONFIG_SYS_SPD_BUS_NUM,
 579  * so that the SPD code will work.  This means that all pre-relocation I2C
 580  * operations can only occur on the CONFIG_SYS_SPD_BUS_NUM bus.  So if
 581  * CONFIG_SYS_EEPROM_BUS_NUM != CONFIG_SYS_SPD_BUS_NUM, then we can't read the EEPROM when
 582  * this function is called.  Oh well.
 583  */
 584 unsigned int get_cpu_board_revision(void)
 585 {
 586         struct board_eeprom {
 587                 u32 id;           /* 0x00 - 0x03 EEPROM Tag 'CCID' */
 588                 u8 major;         /* 0x04        Board revision, major */
 589                 u8 minor;         /* 0x05        Board revision, minor */
 590         } be;
 591
 592 #ifndef CONFIG_DM_I2C
 593         i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
 594                 (void *)&be, sizeof(be));
 595 #else
 596         struct udevice *dev;
 597 #ifdef CONFIG_SYS_EEPROM_BUS_NUM
 598         ret = i2c_get_chip_for_busnum(CONFIG_SYS_EEPROM_BUS_NUM,
 599                                       CONFIG_SYS_I2C_EEPROM_ADDR,
 600                                       CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
 601                                       &dev);
 602 #else
 603         ret = i2c_get_chip_for_busnum(0, CONFIG_SYS_I2C_EEPROM_ADDR,
 604                                       CONFIG_SYS_I2C_EEPROM_ADDR_LEN,
 605                                       &dev)
 606 #endif
 607         if (!ret)
 608                 dm_i2c_read(dev, 0, (void *)&be, sizeof(be));
 609 #endif
 610
 611         if (be.id != (('C' << 24) | ('C' << 16) | ('I' << 8) | 'D'))
 612                 return MPC85XX_CPU_BOARD_REV(0, 0);
 613
 614         if ((be.major == 0xff) && (be.minor == 0xff))
 615                 return MPC85XX_CPU_BOARD_REV(0, 0);
 616
 617         return MPC85XX_CPU_BOARD_REV(be.major, be.minor);
 618 }
 619 #endif