bootloader/main-pp.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 by Barry Wardell
  11  *
  12  * Based on Rockbox iriver bootloader by Linus Nielsen Feltzing
  13  * and the ipodlinux bootloader by Daniel Palffy and Bernard Leach
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  21  * KIND, either express or implied.
  22  *
  23  ****************************************************************************/
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26
  27 #include "config.h"
  28 #include "common.h"
  29 #include "cpu.h"
  30 #include "file.h"
  31 #include "system.h"
  32 #include "kernel.h"
  33 #include "lcd.h"
  34 #include "font.h"
  35 #include "storage.h"
  36 #include "adc.h"
  37 #include "button.h"
  38 #include "disk.h"
  39 #include "crc32-mi4.h"
  40 #include <string.h>
  41 #include "power.h"
  42 #if defined(SANSA_E200) || defined(PHILIPS_SA9200)
  43 #include "i2c.h"
  44 #include "backlight-target.h"
  45 #endif
  46 #if defined(SANSA_E200) || defined(SANSA_C200) || defined(PHILIPS_SA9200)
  47 #include "usb.h"
  48 #include "usb_drv.h"
  49 #endif
  50 #if defined(SAMSUNG_YH925)
  51 /* this function (in lcd-yh925.c) resets the screen orientation for the OF
  52  * for use with dualbooting */
  53 void lcd_reset(void);
  54 #endif
  55
  56 /* Show the Rockbox logo - in show_logo.c */
  57 extern int show_logo(void);
  58
  59 /* Button definitions */
  60 #if CONFIG_KEYPAD == IRIVER_H10_PAD
  61 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  62
  63 #elif CONFIG_KEYPAD == SANSA_E200_PAD
  64 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  65
  66 #elif CONFIG_KEYPAD == SANSA_C200_PAD
  67 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  68
  69 #elif CONFIG_KEYPAD == MROBE100_PAD
  70 #define BOOTLOADER_BOOT_OF      BUTTON_POWER
  71
  72 #elif CONFIG_KEYPAD == PHILIPS_SA9200_PAD
  73 #define BOOTLOADER_BOOT_OF      BUTTON_VOL_UP
  74
  75 #elif CONFIG_KEYPAD == PHILIPS_HDD1630_PAD
  76 #define BOOTLOADER_BOOT_OF      BUTTON_MENU
  77
  78 #elif CONFIG_KEYPAD == PHILIPS_HDD6330_PAD
  79 #define BOOTLOADER_BOOT_OF      BUTTON_VOL_UP
  80
  81 #elif CONFIG_KEYPAD == SAMSUNG_YH_PAD
  82 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  83
  84 #elif CONFIG_KEYPAD == SANSA_FUZE_PAD
  85 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  86
  87 #elif CONFIG_KEYPAD == PBELL_VIBE500_PAD
  88 #define BOOTLOADER_BOOT_OF      BUTTON_OK
  89
  90 #endif
  91
  92 /* Maximum allowed firmware image size. 10MB is more than enough */
  93 #define MAX_LOADSIZE (10*1024*1024)
  94
  95 /* A buffer to load the original firmware or Rockbox into */
  96 unsigned char *loadbuffer = (unsigned char *)DRAM_START;
  97
  98 /* Bootloader version */
  99 char version[] = APPSVERSION;
 100
 101 /* Locations and sizes in hidden partition on Sansa */
 102 #if (CONFIG_STORAGE & STORAGE_SD)
 103 #define PPMI_SECTOR_OFFSET  1024
 104 #define PPMI_SECTORS        1
 105 #define MI4_HEADER_SECTORS  1
 106 #define NUM_PARTITIONS      2
 107
 108 #else
 109 #define NUM_PARTITIONS      1
 110
 111 #endif
 112
 113 #define MI4_HEADER_SIZE     0x200
 114
 115 /* mi4 header structure */
 116 struct mi4header_t {
 117     unsigned char magic[4];
 118     uint32_t version;
 119     uint32_t length;
 120     uint32_t crc32;
 121     uint32_t enctype;
 122     uint32_t mi4size;
 123     uint32_t plaintext;
 124     uint32_t dsa_key[10];
 125     uint32_t pad[109];
 126     unsigned char type[4];
 127     unsigned char model[4];
 128 };
 129
 130 /* PPMI header structure */
 131 struct ppmi_header_t {
 132     unsigned char magic[4];
 133     uint32_t length;
 134     uint32_t pad[126];
 135 };
 136
 137 inline unsigned int le2int(unsigned char* buf)
 138 {
 139    int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
 140
 141    return res;
 142 }
 143
 144 inline void int2le(unsigned int val, unsigned char* addr)
 145 {
 146     addr[0] = val & 0xFF;
 147     addr[1] = (val >> 8) & 0xff;
 148     addr[2] = (val >> 16) & 0xff;
 149     addr[3] = (val >> 24) & 0xff;
 150 }
 151
 152 struct tea_key {
 153   const char * name;
 154   uint32_t     key[4];
 155 };
 156
 157 #define NUM_KEYS (sizeof(tea_keytable)/sizeof(tea_keytable[0]))
 158 struct tea_key tea_keytable[] = {
 159   { "default" ,          { 0x20d36cc0, 0x10e8c07d, 0xc0e7dcaa, 0x107eb080 } },
 160   { "sansa",             { 0xe494e96e, 0x3ee32966, 0x6f48512b, 0xa93fbb42 } },
 161   { "sansa_gh",          { 0xd7b10538, 0xc662945b, 0x1b3fce68, 0xf389c0e6 } },
 162   { "sansa_103",         { 0x1d29ddc0, 0x2579c2cd, 0xce339e1a, 0x75465dfe } },
 163   { "rhapsody",          { 0x7aa9c8dc, 0xbed0a82a, 0x16204cc7, 0x5904ef38 } },
 164   { "p610",              { 0x950e83dc, 0xec4907f9, 0x023734b9, 0x10cfb7c7 } },
 165   { "p640",              { 0x220c5f23, 0xd04df68e, 0x431b5e25, 0x4dcc1fa1 } },
 166   { "virgin",            { 0xe83c29a1, 0x04862973, 0xa9b3f0d4, 0x38be2a9c } },
 167   { "20gc_eng",          { 0x0240772c, 0x6f3329b5, 0x3ec9a6c5, 0xb0c9e493 } },
 168   { "20gc_fre",          { 0xbede8817, 0xb23bfe4f, 0x80aa682d, 0xd13f598c } },
 169   { "elio_p722",         { 0x6af3b9f8, 0x777483f5, 0xae8181cc, 0xfa6d8a84 } },
 170   { "c200",              { 0xbf2d06fa, 0xf0e23d59, 0x29738132, 0xe2d04ca7 } },
 171   { "c200_103",          { 0x2a7968de, 0x15127979, 0x142e60a7, 0xe49c1893 } },
 172   { "c200_106",          { 0xa913d139, 0xf842f398, 0x3e03f1a6, 0x060ee012 } },
 173   { "view",              { 0x70e19bda, 0x0c69ea7d, 0x2b8b1ad1, 0xe9767ced } },
 174   { "sa9200",            { 0x33ea0236, 0x9247bdc5, 0xdfaedf9f, 0xd67c9d30 } },
 175   { "hdd1630",           { 0x04543ced, 0xcebfdbad, 0xf7477872, 0x0d12342e } },
 176   { "vibe500",           { 0xe3a66156, 0x77c6b67a, 0xe821dca5, 0xca8ca37c } },
 177 };
 178
 179 /*
 180
 181 tea_decrypt() from http://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm
 182
 183 "Following is an adaptation of the reference encryption and decryption
 184 routines in C, released into the public domain by David Wheeler and
 185 Roger Needham:"
 186
 187 */
 188
 189 /* NOTE: The mi4 version of TEA uses a different initial value to sum compared
 190          to the reference implementation and the main loop is 8 iterations, not
 191          32.
 192 */
 193
 194 static void tea_decrypt(uint32_t* v0, uint32_t* v1, uint32_t* k) {
 195     uint32_t sum=0xF1BBCDC8, i;                    /* set up */
 196     uint32_t delta=0x9E3779B9;                     /* a key schedule constant */
 197     uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3];   /* cache key */
 198     for(i=0; i<8; i++) {                               /* basic cycle start */
 199         *v1 -= ((*v0<<4) + k2) ^ (*v0 + sum) ^ ((*v0>>5) + k3);
 200         *v0 -= ((*v1<<4) + k0) ^ (*v1 + sum) ^ ((*v1>>5) + k1);
 201         sum -= delta;                                   /* end cycle */
 202     }
 203 }
 204
 205 /* mi4 files are encrypted in 64-bit blocks (two little-endian 32-bit
 206    integers) and the key is incremented after each block
 207  */
 208
 209 static void tea_decrypt_buf(unsigned char* src, unsigned char* dest, size_t n, uint32_t * key)
 210 {
 211     uint32_t v0, v1;
 212     unsigned int i;
 213
 214     for (i = 0; i < (n / 8); i++) {
 215         v0 = le2int(src);
 216         v1 = le2int(src+4);
 217
 218         tea_decrypt(&v0, &v1, key);
 219
 220         int2le(v0, dest);
 221         int2le(v1, dest+4);
 222
 223         src += 8;
 224         dest += 8;
 225
 226         /* Now increment the key */
 227         key[0]++;
 228         if (key[0]==0) {
 229             key[1]++;
 230             if (key[1]==0) {
 231                 key[2]++;
 232                 if (key[2]==0) {
 233                     key[3]++;
 234                 }
 235             }
 236         }
 237     }
 238 }
 239
 240 static inline bool tea_test_key(unsigned char magic_enc[8], uint32_t * key, int unaligned)
 241 {
 242     unsigned char magic_dec[8];
 243     tea_decrypt_buf(magic_enc, magic_dec, 8, key);
 244
 245     return (le2int(&magic_dec[4*unaligned]) == 0xaa55aa55);
 246 }
 247
 248 static int tea_find_key(struct mi4header_t *mi4header, int fd)
 249 {
 250     unsigned int i;
 251     int rc;
 252     unsigned int j;
 253     uint32_t key[4];
 254     unsigned char magic_enc[8];
 255     int key_found = -1;
 256     unsigned int magic_location = mi4header->length-4;
 257     int unaligned = 0;
 258
 259     if ( (magic_location % 8) != 0 )
 260     {
 261         unaligned = 1;
 262         magic_location -= 4;
 263     }
 264
 265     /* Load encrypted magic 0xaa55aa55 to check key */
 266     lseek(fd, MI4_HEADER_SIZE + magic_location, SEEK_SET);
 267     rc = read(fd, magic_enc, 8);
 268     if(rc < 8 )
 269         return EREAD_IMAGE_FAILED;
 270
 271     printf("Searching for key:");
 272
 273     for (i=0; i < NUM_KEYS && (key_found<0) ; i++) {
 274         key[0] = tea_keytable[i].key[0];
 275         key[1] = tea_keytable[i].key[1];
 276         key[2] = tea_keytable[i].key[2];
 277         key[3] = tea_keytable[i].key[3];
 278
 279         /* Now increment the key */
 280         for(j=0; j<((magic_location-mi4header->plaintext)/8); j++){
 281             key[0]++;
 282             if (key[0]==0) {
 283                 key[1]++;
 284                 if (key[1]==0) {
 285                     key[2]++;
 286                     if (key[2]==0) {
 287                         key[3]++;
 288                     }
 289                 }
 290             }
 291         }
 292
 293         if (tea_test_key(magic_enc,key,unaligned))
 294         {
 295             key_found = i;
 296             printf("%s...found", tea_keytable[i].name);
 297         } else {
 298            /* printf("%s...failed", tea_keytable[i].name); */
 299         }
 300     }
 301
 302     return key_found;
 303 }
 304
 305
 306 /* Load mi4 format firmware image */
 307 int load_mi4(unsigned char* buf, char* firmware, unsigned int buffer_size)
 308 {
 309     int fd;
 310     struct mi4header_t mi4header;
 311     int rc;
 312     unsigned long sum;
 313     char filename[MAX_PATH];
 314
 315     snprintf(filename,sizeof(filename), BOOTDIR "/%s",firmware);
 316     fd = open(filename, O_RDONLY);
 317     if(fd < 0)
 318     {
 319         snprintf(filename,sizeof(filename),"/%s",firmware);
 320         fd = open(filename, O_RDONLY);
 321         if(fd < 0)
 322             return EFILE_NOT_FOUND;
 323     }
 324
 325     read(fd, &mi4header, MI4_HEADER_SIZE);
 326
 327     /* MI4 file size */
 328     printf("mi4 size: %x", mi4header.mi4size);
 329
 330     if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
 331         return EFILE_TOO_BIG;
 332
 333     /* CRC32 */
 334     printf("CRC32: %x", mi4header.crc32);
 335
 336     /* Rockbox model id */
 337     printf("Model id: %.4s", mi4header.model);
 338
 339     /* Read binary type (RBOS, RBBL) */
 340     printf("Binary type: %.4s", mi4header.type);
 341
 342     /* Load firmware file */
 343     lseek(fd, MI4_HEADER_SIZE, SEEK_SET);
 344     rc = read(fd, buf, mi4header.mi4size-MI4_HEADER_SIZE);
 345     if(rc < (int)mi4header.mi4size-MI4_HEADER_SIZE)
 346         return EREAD_IMAGE_FAILED;
 347
 348     /* Check CRC32 to see if we have a valid file */
 349     sum = chksum_crc32 (buf, mi4header.mi4size - MI4_HEADER_SIZE);
 350
 351     printf("Calculated CRC32: %x", sum);
 352
 353     if(sum != mi4header.crc32)
 354         return EBAD_CHKSUM;
 355
 356     if( (mi4header.plaintext + MI4_HEADER_SIZE) != mi4header.mi4size)
 357     {
 358         /* Load encrypted firmware */
 359         int key_index = tea_find_key(&mi4header, fd);
 360
 361         if (key_index < 0)
 362             return EINVALID_FORMAT;
 363
 364         /* Plaintext part is already loaded */
 365         buf += mi4header.plaintext;
 366
 367         /* Decrypt in-place */
 368         tea_decrypt_buf(buf, buf,
 369                         mi4header.mi4size-(mi4header.plaintext+MI4_HEADER_SIZE),
 370                         tea_keytable[key_index].key);
 371
 372         printf("%s key used", tea_keytable[key_index].name);
 373
 374         /* Check decryption was successfull */
 375         if(le2int(&buf[mi4header.length-mi4header.plaintext-4]) != 0xaa55aa55)
 376         {
 377             return EREAD_IMAGE_FAILED;
 378         }
 379     }
 380
 381     return EOK;
 382 }
 383
 384 #if (CONFIG_STORAGE & STORAGE_SD)
 385 /* Load mi4 firmware from a hidden disk partition */
 386 int load_mi4_part(unsigned char* buf, struct partinfo* pinfo,
 387                   unsigned int buffer_size, bool disable_rebuild)
 388 {
 389     struct mi4header_t mi4header;
 390     struct ppmi_header_t ppmi_header;
 391     unsigned long sum;
 392
 393     /* Read header to find out how long the mi4 file is. */
 394     storage_read_sectors(0, pinfo->start + PPMI_SECTOR_OFFSET,
 395                             PPMI_SECTORS, &ppmi_header);
 396
 397     /* The first four characters at 0x80000 (sector 1024) should be PPMI*/
 398     if( memcmp(ppmi_header.magic, "PPMI", 4) )
 399         return EFILE_NOT_FOUND;
 400
 401     printf("BL mi4 size: %x", ppmi_header.length);
 402
 403     /* Read mi4 header of the OF */
 404     storage_read_sectors(0, pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
 405                        + (ppmi_header.length/512), MI4_HEADER_SECTORS, &mi4header);
 406
 407     /* We don't support encrypted mi4 files yet */
 408     if( (mi4header.plaintext) != (mi4header.mi4size-MI4_HEADER_SIZE))
 409         return EINVALID_FORMAT;
 410
 411     /* MI4 file size */
 412     printf("OF mi4 size: %x", mi4header.mi4size);
 413
 414     if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
 415         return EFILE_TOO_BIG;
 416
 417     /* CRC32 */
 418     printf("CRC32: %x", mi4header.crc32);
 419
 420     /* Rockbox model id */
 421     printf("Model id: %.4s", mi4header.model);
 422
 423     /* Read binary type (RBOS, RBBL) */
 424     printf("Binary type: %.4s", mi4header.type);
 425
 426     /* Load firmware */
 427     storage_read_sectors(0, pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
 428                         + (ppmi_header.length/512) + MI4_HEADER_SECTORS,
 429                         (mi4header.mi4size-MI4_HEADER_SIZE)/512, buf);
 430
 431     /* Check CRC32 to see if we have a valid file */
 432     sum = chksum_crc32 (buf,mi4header.mi4size-MI4_HEADER_SIZE);
 433
 434     printf("Calculated CRC32: %x", sum);
 435
 436     if(sum != mi4header.crc32)
 437         return EBAD_CHKSUM;
 438
 439 #ifdef SANSA_E200
 440     if (disable_rebuild)
 441     {
 442         char block[512];
 443
 444         printf("Disabling database rebuild");
 445
 446         storage_read_sectors(0, pinfo->start + 0x3c08, 1, block);
 447         block[0xe1] = 0;
 448         storage_write_sectors(0, pinfo->start + 0x3c08, 1, block);
 449     }
 450 #else
 451     (void) disable_rebuild;
 452 #endif
 453
 454     return EOK;
 455 }
 456 #endif
 457
 458 void* main(void)
 459 {
 460     int i;
 461     int btn;
 462     int rc;
 463     int num_partitions;
 464     struct partinfo* pinfo;
 465 #if defined(SANSA_E200) || defined(SANSA_C200) || defined(PHILIPS_SA9200) \
 466     || defined (SANSA_VIEW)
 467 #if !defined(USE_ROCKBOX_USB)
 468     int usb_retry = 0;
 469 #endif
 470     bool usb = false;
 471 #else
 472     char buf[256];
 473     unsigned short* identify_info;
 474 #endif
 475
 476     chksum_crc32gentab ();
 477
 478     system_init();
 479     kernel_init();
 480
 481     lcd_init();
 482
 483     font_init();
 484     show_logo();
 485
 486     adc_init();
 487     button_init();
 488 #if defined(SANSA_E200) || defined(PHILIPS_SA9200)
 489     i2c_init();
 490     _backlight_on();
 491 #endif
 492
 493     if (button_hold())
 494     {
 495         verbose = true;
 496         lcd_clear_display();
 497         printf("Hold switch on");
 498         printf("Shutting down...");
 499         sleep(HZ);
 500         power_off();
 501     }
 502
 503     btn = button_read_device();
 504
 505     /* Enable bootloader messages if any button is pressed */
 506     if (btn) {
 507         lcd_clear_display();
 508         verbose = true;
 509     }
 510
 511 #if defined(SANSA_E200) || defined(SANSA_C200) || defined(PHILIPS_SA9200)
 512 #if !defined(USE_ROCKBOX_USB)
 513     usb_init();
 514     while (usb_drv_powered() && usb_retry < 5 && !usb)
 515     {
 516         usb_retry++;
 517         sleep(HZ/4);
 518         usb = (usb_detect() == USB_INSERTED);
 519     }
 520     if (usb)
 521         btn |= BOOTLOADER_BOOT_OF;
 522 #endif /* USE_ROCKBOX_USB */
 523 #endif
 524
 525     lcd_setfont(FONT_SYSFIXED);
 526
 527     printf("Rockbox boot loader");
 528     printf("Version: %s", version);
 529     printf(MODEL_NAME);
 530
 531     i=storage_init();
 532 #if !(CONFIG_STORAGE & STORAGE_SD)
 533     if (i==0) {
 534         identify_info=ata_get_identify();
 535         /* Show model */
 536         for (i=0; i < 20; i++) {
 537             ((unsigned short*)buf)[i]=htobe16(identify_info[i+27]);
 538         }
 539         buf[40]=0;
 540         for (i=39; i && buf[i]==' '; i--) {
 541             buf[i]=0;
 542         }
 543         printf(buf);
 544     } else {
 545         error(EATA, i);
 546     }
 547 #endif
 548
 549     disk_init(IF_MV(0));
 550     num_partitions = disk_mount_all();
 551     if (num_partitions<=0)
 552     {
 553         error(EDISK,num_partitions);
 554     }
 555
 556     /* Just list the first 2 partitions since we don't have any devices yet
 557        that have more than that */
 558     for(i=0; i<NUM_PARTITIONS; i++)
 559     {
 560         pinfo = disk_partinfo(i);
 561         printf("Partition %d: 0x%02x %ld MB",
 562                 i, pinfo->type, pinfo->size / 2048);
 563     }
 564
 565     /* Try loading Rockbox, if that fails, fall back to the OF */
 566     if((btn & BOOTLOADER_BOOT_OF) == 0)
 567     {
 568         printf("Loading Rockbox...");
 569         rc = load_mi4(loadbuffer, BOOTFILE, MAX_LOADSIZE);
 570         if (rc < EOK)
 571         {
 572             bool old_verbose = verbose;
 573             verbose = true;
 574             printf("Can't load " BOOTFILE ": ");
 575             printf(strerror(rc));
 576             verbose = old_verbose;
 577             btn |= BOOTLOADER_BOOT_OF;
 578             sleep(5*HZ);
 579         }
 580         else
 581             return (void*)loadbuffer;
 582     }
 583
 584     if(btn & BOOTLOADER_BOOT_OF)
 585     {
 586         /* Load original mi4 firmware in to a memory buffer called loadbuffer.
 587            The rest of the loading is done in crt0.S.
 588            1) First try reading from the hidden partition (on Sansa only).
 589            2) Next try a decrypted mi4 file in /System/OF.mi4
 590            3) Finally, try a raw firmware binary in /System/OF.bin. It should be
 591               a mi4 firmware decrypted and header stripped using mi4code.
 592         */
 593         printf("Loading original firmware...");
 594
 595 #if (CONFIG_STORAGE & STORAGE_SD)
 596         /* First try a (hidden) firmware partition */
 597         printf("Trying firmware partition");
 598         pinfo = disk_partinfo(1);
 599         if(pinfo->type == PARTITION_TYPE_OS2_HIDDEN_C_DRIVE)
 600         {
 601             rc = load_mi4_part(loadbuffer, pinfo, MAX_LOADSIZE, usb);
 602             if (rc < EOK) {
 603                 printf("Can't load from partition");
 604                 printf(strerror(rc));
 605             } else {
 606                 return (void*)loadbuffer;
 607             }
 608         } else {
 609             printf("No hidden partition found.");
 610         }
 611 #endif
 612
 613 #if defined(PHILIPS_HDD1630) || defined(PHILIPS_HDD6330)
 614         printf("Trying /System/OF.ebn");
 615         rc=load_mi4(loadbuffer, "/System/OF.ebn", MAX_LOADSIZE);
 616         if (rc < EOK) {
 617             printf("Can't load /System/OF.ebn");
 618             printf(strerror(rc));
 619         } else {
 620             return (void*)loadbuffer;
 621         }
 622 #endif
 623
 624         printf("Trying /System/OF.mi4");
 625         rc=load_mi4(loadbuffer, "/System/OF.mi4", MAX_LOADSIZE);
 626         if (rc < EOK) {
 627             printf("Can't load /System/OF.mi4");
 628             printf(strerror(rc));
 629         } else {
 630 #if defined(SAMSUNG_YH925)
 631             lcd_reset();
 632 #endif
 633             return (void*)loadbuffer;
 634         }
 635
 636         printf("Trying /System/OF.bin");
 637         rc=load_raw_firmware(loadbuffer, "/System/OF.bin", MAX_LOADSIZE);
 638         if (rc < EOK) {
 639             printf("Can't load /System/OF.bin");
 640             printf(strerror(rc));
 641         } else {
 642 #if defined(SAMSUNG_YH925)
 643             lcd_reset();
 644 #endif
 645             return (void*)loadbuffer;
 646         }
 647
 648         error(0, 0);
 649     }
 650     return (void*)loadbuffer;
 651 }