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 #include "version.h"
  43 #if defined(SANSA_E200) || defined(PHILIPS_SA9200)
  44 #include "i2c.h"
  45 #include "backlight-target.h"
  46 #endif
  47 #include "usb.h"
  48 #if defined(SANSA_E200) || defined(SANSA_C200) || defined(PHILIPS_SA9200)
  49 #include "usb_drv.h"
  50 #endif
  51 #if defined(SAMSUNG_YH925)
  52 /* this function (in lcd-yh925.c) resets the screen orientation for the OF
  53  * for use with dualbooting */
  54 void lcd_reset(void);
  55 #endif
  56
  57 /* Show the Rockbox logo - in show_logo.c */
  58 extern void show_logo(void);
  59
  60 /* Button definitions */
  61 #if CONFIG_KEYPAD == IRIVER_H10_PAD
  62 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  63
  64 #elif CONFIG_KEYPAD == SANSA_E200_PAD
  65 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  66
  67 #elif CONFIG_KEYPAD == SANSA_C200_PAD
  68 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  69
  70 #elif CONFIG_KEYPAD == MROBE100_PAD
  71 #define BOOTLOADER_BOOT_OF      BUTTON_POWER
  72
  73 #elif CONFIG_KEYPAD == PHILIPS_SA9200_PAD
  74 #define BOOTLOADER_BOOT_OF      BUTTON_VOL_UP
  75
  76 #elif CONFIG_KEYPAD == PHILIPS_HDD1630_PAD
  77 #define BOOTLOADER_BOOT_OF      BUTTON_MENU
  78
  79 #elif CONFIG_KEYPAD == PHILIPS_HDD6330_PAD
  80 #define BOOTLOADER_BOOT_OF      BUTTON_VOL_UP
  81
  82 #elif CONFIG_KEYPAD == SAMSUNG_YH_PAD
  83 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  84
  85 #elif CONFIG_KEYPAD == SANSA_FUZE_PAD
  86 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  87
  88 #elif CONFIG_KEYPAD == PBELL_VIBE500_PAD
  89 #define BOOTLOADER_BOOT_OF      BUTTON_OK
  90
  91 #endif
  92
  93 /* Maximum allowed firmware image size. 10MB is more than enough */
  94 #define MAX_LOADSIZE (10*1024*1024)
  95
  96 /* A buffer to load the original firmware or Rockbox into */
  97 unsigned char *loadbuffer = (unsigned char *)DRAM_START;
  98
  99 /* Locations and sizes in hidden partition on Sansa */
 100 #if (CONFIG_STORAGE & STORAGE_SD)
 101 #define PPMI_SECTOR_OFFSET  1024
 102 #define PPMI_SECTORS        1
 103 #define MI4_HEADER_SECTORS  1
 104 #define NUM_PARTITIONS      2
 105
 106 #else
 107 #define NUM_PARTITIONS      1
 108
 109 #endif
 110
 111 #define MI4_HEADER_SIZE     0x200
 112
 113 /* mi4 header structure */
 114 struct mi4header_t {
 115     unsigned char magic[4];
 116     uint32_t version;
 117     uint32_t length;
 118     uint32_t crc32;
 119     uint32_t enctype;
 120     uint32_t mi4size;
 121     uint32_t plaintext;
 122     uint32_t dsa_key[10];
 123     uint32_t pad[109];
 124     unsigned char type[4];
 125     unsigned char model[4];
 126 };
 127
 128 /* PPMI header structure */
 129 struct ppmi_header_t {
 130     unsigned char magic[4];
 131     uint32_t length;
 132     uint32_t pad[126];
 133 };
 134
 135 inline unsigned int le2int(unsigned char* buf)
 136 {
 137    int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
 138
 139    return res;
 140 }
 141
 142 inline void int2le(unsigned int val, unsigned char* addr)
 143 {
 144     addr[0] = val & 0xFF;
 145     addr[1] = (val >> 8) & 0xff;
 146     addr[2] = (val >> 16) & 0xff;
 147     addr[3] = (val >> 24) & 0xff;
 148 }
 149
 150 struct tea_key {
 151   const char * name;
 152   uint32_t     key[4];
 153 };
 154
 155 #define NUM_KEYS (sizeof(tea_keytable)/sizeof(tea_keytable[0]))
 156 struct tea_key tea_keytable[] = {
 157   { "default" ,          { 0x20d36cc0, 0x10e8c07d, 0xc0e7dcaa, 0x107eb080 } },
 158   { "sansa",             { 0xe494e96e, 0x3ee32966, 0x6f48512b, 0xa93fbb42 } },
 159   { "sansa_gh",          { 0xd7b10538, 0xc662945b, 0x1b3fce68, 0xf389c0e6 } },
 160   { "sansa_103",         { 0x1d29ddc0, 0x2579c2cd, 0xce339e1a, 0x75465dfe } },
 161   { "rhapsody",          { 0x7aa9c8dc, 0xbed0a82a, 0x16204cc7, 0x5904ef38 } },
 162   { "p610",              { 0x950e83dc, 0xec4907f9, 0x023734b9, 0x10cfb7c7 } },
 163   { "p640",              { 0x220c5f23, 0xd04df68e, 0x431b5e25, 0x4dcc1fa1 } },
 164   { "virgin",            { 0xe83c29a1, 0x04862973, 0xa9b3f0d4, 0x38be2a9c } },
 165   { "20gc_eng",          { 0x0240772c, 0x6f3329b5, 0x3ec9a6c5, 0xb0c9e493 } },
 166   { "20gc_fre",          { 0xbede8817, 0xb23bfe4f, 0x80aa682d, 0xd13f598c } },
 167   { "elio_p722",         { 0x6af3b9f8, 0x777483f5, 0xae8181cc, 0xfa6d8a84 } },
 168   { "c200",              { 0xbf2d06fa, 0xf0e23d59, 0x29738132, 0xe2d04ca7 } },
 169   { "c200_103",          { 0x2a7968de, 0x15127979, 0x142e60a7, 0xe49c1893 } },
 170   { "c200_106",          { 0xa913d139, 0xf842f398, 0x3e03f1a6, 0x060ee012 } },
 171   { "view",              { 0x70e19bda, 0x0c69ea7d, 0x2b8b1ad1, 0xe9767ced } },
 172   { "sa9200",            { 0x33ea0236, 0x9247bdc5, 0xdfaedf9f, 0xd67c9d30 } },
 173   { "hdd1630/hdd63x0",   { 0x04543ced, 0xcebfdbad, 0xf7477872, 0x0d12342e } },
 174   { "vibe500",           { 0xe3a66156, 0x77c6b67a, 0xe821dca5, 0xca8ca37c } },
 175 };
 176
 177 /*
 178
 179 tea_decrypt() from http://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm
 180
 181 "Following is an adaptation of the reference encryption and decryption
 182 routines in C, released into the public domain by David Wheeler and
 183 Roger Needham:"
 184
 185 */
 186
 187 /* NOTE: The mi4 version of TEA uses a different initial value to sum compared
 188          to the reference implementation and the main loop is 8 iterations, not
 189          32.
 190 */
 191
 192 static void tea_decrypt(uint32_t* v0, uint32_t* v1, uint32_t* k) {
 193     uint32_t sum=0xF1BBCDC8, i;                    /* set up */
 194     uint32_t delta=0x9E3779B9;                     /* a key schedule constant */
 195     uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3];   /* cache key */
 196     for(i=0; i<8; i++) {                               /* basic cycle start */
 197         *v1 -= ((*v0<<4) + k2) ^ (*v0 + sum) ^ ((*v0>>5) + k3);
 198         *v0 -= ((*v1<<4) + k0) ^ (*v1 + sum) ^ ((*v1>>5) + k1);
 199         sum -= delta;                                   /* end cycle */
 200     }
 201 }
 202
 203 /* mi4 files are encrypted in 64-bit blocks (two little-endian 32-bit
 204    integers) and the key is incremented after each block
 205  */
 206
 207 static void tea_decrypt_buf(unsigned char* src, unsigned char* dest, size_t n, uint32_t * key)
 208 {
 209     uint32_t v0, v1;
 210     unsigned int i;
 211
 212     for (i = 0; i < (n / 8); i++) {
 213         v0 = le2int(src);
 214         v1 = le2int(src+4);
 215
 216         tea_decrypt(&v0, &v1, key);
 217
 218         int2le(v0, dest);
 219         int2le(v1, dest+4);
 220
 221         src += 8;
 222         dest += 8;
 223
 224         /* Now increment the key */
 225         key[0]++;
 226         if (key[0]==0) {
 227             key[1]++;
 228             if (key[1]==0) {
 229                 key[2]++;
 230                 if (key[2]==0) {
 231                     key[3]++;
 232                 }
 233             }
 234         }
 235     }
 236 }
 237
 238 static int tea_find_key(struct mi4header_t *mi4header, unsigned char* buf)
 239 {
 240     unsigned int i;
 241     uint32_t key[4];
 242     uint32_t keyinc;
 243     unsigned char magic_dec[8];
 244     int key_found = -1;
 245     unsigned int magic_location = mi4header->length-4;
 246     int unaligned = 0;
 247
 248     if ( (magic_location % 8) != 0 )
 249     {
 250         unaligned = 1;
 251         magic_location -= 4;
 252     }
 253
 254     printf("Searching for key:");
 255
 256     for (i=0; i < NUM_KEYS && (key_found<0) ; i++) {
 257         key[0] = tea_keytable[i].key[0];
 258         key[1] = tea_keytable[i].key[1];
 259         key[2] = tea_keytable[i].key[2];
 260         key[3] = tea_keytable[i].key[3];
 261
 262         /* Now increment the key */
 263         keyinc = (magic_location-mi4header->plaintext)/8;
 264         if ((key[0]+keyinc) < key[0]) key[1]++;
 265         key[0] += keyinc;
 266         if (key[1]==0) key[2]++;
 267         if (key[2]==0) key[3]++;
 268
 269         /* Decrypt putative magic */
 270         tea_decrypt_buf(&buf[magic_location], magic_dec, 8, key);
 271
 272         if (le2int(&magic_dec[4*unaligned]) == 0xaa55aa55)
 273         {
 274             key_found = i;
 275             printf("%s...found", tea_keytable[i].name);
 276         } else {
 277            /* printf("%s...failed", tea_keytable[i].name); */
 278         }
 279     }
 280
 281     return key_found;
 282 }
 283
 284
 285 /* Load mi4 format firmware image */
 286 int load_mi4(unsigned char* buf, char* firmware, unsigned int buffer_size)
 287 {
 288     int fd;
 289     struct mi4header_t mi4header;
 290     int rc;
 291     unsigned long sum;
 292     char filename[MAX_PATH];
 293
 294     snprintf(filename,sizeof(filename), BOOTDIR "/%s",firmware);
 295     fd = open(filename, O_RDONLY);
 296     if(fd < 0)
 297     {
 298         snprintf(filename,sizeof(filename),"/%s",firmware);
 299         fd = open(filename, O_RDONLY);
 300         if(fd < 0)
 301             return EFILE_NOT_FOUND;
 302     }
 303
 304     read(fd, &mi4header, MI4_HEADER_SIZE);
 305
 306     /* MI4 file size */
 307     printf("mi4 size: %x", mi4header.mi4size);
 308
 309     if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
 310     {
 311         close(fd);
 312         return EFILE_TOO_BIG;
 313     }
 314
 315     /* CRC32 */
 316     printf("CRC32: %x", mi4header.crc32);
 317
 318     /* Rockbox model id */
 319     printf("Model id: %.4s", mi4header.model);
 320
 321     /* Read binary type (RBOS, RBBL) */
 322     printf("Binary type: %.4s", mi4header.type);
 323
 324     /* Load firmware file */
 325     lseek(fd, MI4_HEADER_SIZE, SEEK_SET);
 326     rc = read(fd, buf, mi4header.mi4size-MI4_HEADER_SIZE);
 327     close(fd);
 328     if(rc < (int)mi4header.mi4size-MI4_HEADER_SIZE)
 329         return EREAD_IMAGE_FAILED;
 330
 331     /* Check CRC32 to see if we have a valid file */
 332     sum = chksum_crc32 (buf, mi4header.mi4size - MI4_HEADER_SIZE);
 333
 334     printf("Calculated CRC32: %x", sum);
 335
 336     if(sum != mi4header.crc32)
 337         return EBAD_CHKSUM;
 338
 339     if( (mi4header.plaintext + MI4_HEADER_SIZE) != mi4header.mi4size)
 340     {
 341         /* Load encrypted firmware */
 342         int key_index = tea_find_key(&mi4header, buf);
 343
 344         if (key_index < 0)
 345             return EINVALID_FORMAT;
 346
 347         /* Plaintext part is already loaded */
 348         buf += mi4header.plaintext;
 349
 350         /* Decrypt in-place */
 351         tea_decrypt_buf(buf, buf,
 352                         mi4header.mi4size-(mi4header.plaintext+MI4_HEADER_SIZE),
 353                         tea_keytable[key_index].key);
 354
 355         printf("%s key used", tea_keytable[key_index].name);
 356
 357         /* Check decryption was successfull */
 358         if(le2int(&buf[mi4header.length-mi4header.plaintext-4]) != 0xaa55aa55)
 359             return EREAD_IMAGE_FAILED;
 360     }
 361
 362     return EOK;
 363 }
 364
 365 #if (CONFIG_STORAGE & STORAGE_SD)
 366 /* Load mi4 firmware from a hidden disk partition */
 367 int load_mi4_part(unsigned char* buf, struct partinfo* pinfo,
 368                   unsigned int buffer_size, bool disable_rebuild)
 369 {
 370     struct mi4header_t mi4header;
 371     struct ppmi_header_t ppmi_header;
 372     unsigned long sum;
 373
 374     /* Read header to find out how long the mi4 file is. */
 375     storage_read_sectors(pinfo->start + PPMI_SECTOR_OFFSET,
 376                          PPMI_SECTORS, &ppmi_header);
 377
 378     /* The first four characters at 0x80000 (sector 1024) should be PPMI*/
 379     if( memcmp(ppmi_header.magic, "PPMI", 4) )
 380         return EFILE_NOT_FOUND;
 381
 382     printf("BL mi4 size: %x", ppmi_header.length);
 383
 384     /* Read mi4 header of the OF */
 385     storage_read_sectors(pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
 386                        + (ppmi_header.length/512), MI4_HEADER_SECTORS, &mi4header);
 387
 388     /* We don't support encrypted mi4 files yet */
 389     if( (mi4header.plaintext) != (mi4header.mi4size-MI4_HEADER_SIZE))
 390         return EINVALID_FORMAT;
 391
 392     /* MI4 file size */
 393     printf("OF mi4 size: %x", mi4header.mi4size);
 394
 395     if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
 396         return EFILE_TOO_BIG;
 397
 398     /* CRC32 */
 399     printf("CRC32: %x", mi4header.crc32);
 400
 401     /* Rockbox model id */
 402     printf("Model id: %.4s", mi4header.model);
 403
 404     /* Read binary type (RBOS, RBBL) */
 405     printf("Binary type: %.4s", mi4header.type);
 406
 407     /* Load firmware */
 408     storage_read_sectors(pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
 409                         + (ppmi_header.length/512) + MI4_HEADER_SECTORS,
 410                         (mi4header.mi4size-MI4_HEADER_SIZE)/512, buf);
 411
 412     /* Check CRC32 to see if we have a valid file */
 413     sum = chksum_crc32 (buf,mi4header.mi4size-MI4_HEADER_SIZE);
 414
 415     printf("Calculated CRC32: %x", sum);
 416
 417     if(sum != mi4header.crc32)
 418         return EBAD_CHKSUM;
 419
 420 #ifdef SANSA_E200
 421     if (disable_rebuild)
 422     {
 423         char block[512];
 424
 425         printf("Disabling database rebuild");
 426
 427         storage_read_sectors(pinfo->start + 0x3c08, 1, block);
 428         block[0xe1] = 0;
 429         storage_write_sectors(pinfo->start + 0x3c08, 1, block);
 430     }
 431 #else
 432     (void) disable_rebuild;
 433 #endif
 434
 435     return EOK;
 436 }
 437 #endif /* (CONFIG_STORAGE & STORAGE_SD) */
 438
 439 #ifdef HAVE_BOOTLOADER_USB_MODE
 440 /* Return USB_HANDLED if session took place else return USB_EXTRACTED */
 441 static int handle_usb(int connect_timeout)
 442 {
 443     static struct event_queue q SHAREDBSS_ATTR;
 444     struct queue_event ev;
 445     int usb = USB_EXTRACTED;
 446     long end_tick = 0;
 447
 448     if (!usb_plugged())
 449         return USB_EXTRACTED;
 450
 451     queue_init(&q, true);
 452     usb_init();
 453     usb_start_monitoring();
 454
 455     printf("USB: Connecting");
 456
 457     if (connect_timeout != TIMEOUT_BLOCK)
 458         end_tick = current_tick + connect_timeout;
 459
 460     while (1)
 461     {
 462         /* Sleep no longer than 1/2s */
 463         queue_wait_w_tmo(&q, &ev, HZ/2);
 464
 465         if (ev.id == SYS_USB_CONNECTED)
 466         {
 467             /* Switch to verbose mode if not in it so that the status updates
 468              * are shown */
 469             verbose = true;
 470             /* Got the message - wait for disconnect */
 471             printf("Bootloader USB mode");
 472
 473             usb = USB_HANDLED;
 474             usb_acknowledge(SYS_USB_CONNECTED_ACK);
 475             usb_wait_for_disconnect(&q);
 476             break;
 477         }
 478
 479         if (connect_timeout != TIMEOUT_BLOCK &&
 480             TIME_AFTER(current_tick, end_tick))
 481         {
 482             /* Timed out waiting for the connect - will happen when connected
 483              * to a charger instead of a host port and the charging pin is
 484              * the same as the USB pin */
 485             printf("USB: Timed out");
 486             break;
 487         }
 488
 489         if (!usb_plugged())
 490             break; /* Cable pulled */
 491     }
 492
 493     usb_close();
 494     queue_delete(&q);
 495
 496     return usb;
 497 }
 498 #elif (defined(SANSA_E200) || defined(SANSA_C200) || defined(PHILIPS_SA9200) \
 499     || defined (SANSA_VIEW)) && !defined(USE_ROCKBOX_USB)
 500 /* Return USB_INSERTED if cable present */
 501 static int handle_usb(int connect_timeout)
 502 {
 503     int usb_retry = 0;
 504     int usb = USB_EXTRACTED;
 505
 506     usb_init();
 507     while (usb_drv_powered() && usb_retry < 5 && usb != USB_INSERTED)
 508     {
 509         usb_retry++;
 510         sleep(HZ/4);
 511         usb = usb_detect();
 512     }
 513
 514     if (usb != USB_INSERTED)
 515         usb = USB_EXTRACTED;
 516
 517     return usb;
 518     (void)connect_timeout;
 519 }
 520 #else
 521 /* Ignore cable state */
 522 static int handle_usb(int connect_timeout)
 523 {
 524     return USB_EXTRACTED;
 525     (void)connect_timeout;
 526 }
 527 #endif /* HAVE_BOOTLOADER_USB_MODE */
 528
 529 void* main(void)
 530 {
 531     int i;
 532     int btn;
 533     int rc;
 534     int num_partitions;
 535     struct partinfo* pinfo;
 536 #if !(CONFIG_STORAGE & STORAGE_SD)
 537     char buf[256];
 538     unsigned short* identify_info;
 539 #endif
 540     int usb = USB_EXTRACTED;
 541
 542     chksum_crc32gentab ();
 543
 544     system_init();
 545     kernel_init();
 546
 547 #ifdef HAVE_BOOTLOADER_USB_MODE
 548     /* loader must service interrupts */
 549     enable_interrupt(IRQ_FIQ_STATUS);
 550 #endif
 551
 552     lcd_init();
 553
 554     font_init();
 555     show_logo();
 556
 557     adc_init();
 558 #ifdef HAVE_BOOTLOADER_USB_MODE
 559     button_init_device();
 560 #else
 561     button_init();
 562 #endif
 563 #if defined(SANSA_E200) || defined(PHILIPS_SA9200)
 564     i2c_init();
 565     _backlight_on();
 566 #endif
 567
 568     if (button_hold())
 569     {
 570         verbose = true;
 571         lcd_clear_display();
 572         printf("Hold switch on");
 573         printf("Shutting down...");
 574         sleep(HZ);
 575         power_off();
 576     }
 577
 578     btn = button_read_device();
 579
 580     /* Enable bootloader messages if any button is pressed */
 581 #ifdef HAVE_BOOTLOADER_USB_MODE
 582     lcd_clear_display();
 583     if (btn)
 584         verbose = true;
 585 #else
 586     if (btn) {
 587         lcd_clear_display();
 588         verbose = true;
 589     }
 590 #endif
 591
 592     lcd_setfont(FONT_SYSFIXED);
 593
 594     printf("Rockbox boot loader");
 595     printf("Version: " RBVERSION);
 596     printf(MODEL_NAME);
 597
 598     i=storage_init();
 599 #if !(CONFIG_STORAGE & STORAGE_SD)
 600     if (i==0) {
 601         identify_info=ata_get_identify();
 602         /* Show model */
 603         for (i=0; i < 20; i++) {
 604             ((unsigned short*)buf)[i]=htobe16(identify_info[i+27]);
 605         }
 606         buf[40]=0;
 607         for (i=39; i && buf[i]==' '; i--) {
 608             buf[i]=0;
 609         }
 610         printf(buf);
 611     } else {
 612         error(EATA, i, true);
 613     }
 614 #endif
 615
 616     disk_init(IF_MV(0));
 617     num_partitions = disk_mount_all();
 618     if (num_partitions<=0)
 619     {
 620         error(EDISK,num_partitions, true);
 621     }
 622
 623     /* Just list the first 2 partitions since we don't have any devices yet
 624        that have more than that */
 625     for(i=0; i<NUM_PARTITIONS; i++)
 626     {
 627         pinfo = disk_partinfo(i);
 628         printf("Partition %d: 0x%02x %ld MB",
 629                 i, pinfo->type, pinfo->size / 2048);
 630     }
 631
 632     /* Now that storage is initialized, check for USB connection */
 633     if ((btn & BOOTLOADER_BOOT_OF) == 0)
 634     {
 635         usb_pin_init();
 636         usb = handle_usb(HZ*2);
 637         if (usb == USB_INSERTED)
 638             btn |= BOOTLOADER_BOOT_OF;
 639     }
 640
 641     /* Try loading Rockbox, if that fails, fall back to the OF */
 642     if((btn & BOOTLOADER_BOOT_OF) == 0)
 643     {
 644         printf("Loading Rockbox...");
 645         rc = load_mi4(loadbuffer, BOOTFILE, MAX_LOADSIZE);
 646         if (rc < EOK)
 647         {
 648             bool old_verbose = verbose;
 649             verbose = true;
 650             printf("Can't load " BOOTFILE ": ");
 651             printf(strerror(rc));
 652             verbose = old_verbose;
 653             btn |= BOOTLOADER_BOOT_OF;
 654             sleep(5*HZ);
 655         }
 656         else
 657             goto main_exit;
 658     }
 659
 660     if(btn & BOOTLOADER_BOOT_OF)
 661     {
 662         /* Load original mi4 firmware in to a memory buffer called loadbuffer.
 663            The rest of the loading is done in crt0.S.
 664            1) First try reading from the hidden partition (on Sansa only).
 665            2) Next try a decrypted mi4 file in /System/OF.mi4
 666            3) Finally, try a raw firmware binary in /System/OF.bin. It should be
 667               a mi4 firmware decrypted and header stripped using mi4code.
 668         */
 669         printf("Loading original firmware...");
 670
 671 #if (CONFIG_STORAGE & STORAGE_SD)
 672         /* First try a (hidden) firmware partition */
 673         printf("Trying firmware partition");
 674         pinfo = disk_partinfo(1);
 675         if(pinfo->type == PARTITION_TYPE_OS2_HIDDEN_C_DRIVE)
 676         {
 677             rc = load_mi4_part(loadbuffer, pinfo, MAX_LOADSIZE,
 678                                usb == USB_INSERTED);
 679             if (rc < EOK) {
 680                 printf("Can't load from partition");
 681                 printf(strerror(rc));
 682             } else {
 683                 goto main_exit;
 684             }
 685         } else {
 686             printf("No hidden partition found.");
 687         }
 688 #endif
 689
 690 #if defined(PHILIPS_HDD1630) || defined(PHILIPS_HDD6330) || defined(PHILIPS_SA9200)
 691         printf("Trying /System/OF.ebn");
 692         rc=load_mi4(loadbuffer, "/System/OF.ebn", MAX_LOADSIZE);
 693         if (rc < EOK) {
 694             printf("Can't load /System/OF.ebn");
 695             printf(strerror(rc));
 696         } else {
 697             goto main_exit;
 698         }
 699 #endif
 700
 701         printf("Trying /System/OF.mi4");
 702         rc=load_mi4(loadbuffer, "/System/OF.mi4", MAX_LOADSIZE);
 703         if (rc < EOK) {
 704             printf("Can't load /System/OF.mi4");
 705             printf(strerror(rc));
 706         } else {
 707 #if defined(SAMSUNG_YH925)
 708             lcd_reset();
 709 #endif
 710             goto main_exit;
 711         }
 712
 713         printf("Trying /System/OF.bin");
 714         rc=load_raw_firmware(loadbuffer, "/System/OF.bin", MAX_LOADSIZE);
 715         if (rc < EOK) {
 716             printf("Can't load /System/OF.bin");
 717             printf(strerror(rc));
 718         } else {
 719 #if defined(SAMSUNG_YH925)
 720             lcd_reset();
 721 #endif
 722             goto main_exit;
 723         }
 724
 725         error(0, 0, true);
 726     }
 727
 728 main_exit:
 729 #ifdef HAVE_BOOTLOADER_USB_MODE
 730     storage_close();
 731     system_prepare_fw_start();
 732 #endif
 733
 734     return (void*)loadbuffer;
 735 }