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 #include "common.h"
  27 #include "cpu.h"
  28 #include "file.h"
  29 #include "system.h"
  30 #include "kernel.h"
  31 #include "lcd.h"
  32 #include "font.h"
  33 #include "ata.h"
  34 #include "button.h"
  35 #include "disk.h"
  36 #include "crc32-mi4.h"
  37 #include <string.h>
  38 #include "power.h"
  39 #if defined(SANSA_E200) || defined(PHILIPS_SA9200)
  40 #include "i2c.h"
  41 #include "backlight-target.h"
  42 #endif
  43 #if defined(SANSA_E200) || defined(SANSA_C200) || defined(PHILIPS_SA9200)
  44 #include "usb.h"
  45 #include "usb_drv.h"
  46 #endif
  47
  48 /* Show the Rockbox logo - in show_logo.c */
  49 extern int show_logo(void);
  50
  51 /* Button definitions */
  52 #if CONFIG_KEYPAD == IRIVER_H10_PAD
  53 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  54
  55 #elif CONFIG_KEYPAD == SANSA_E200_PAD
  56 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  57
  58 #elif CONFIG_KEYPAD == SANSA_C200_PAD
  59 #define BOOTLOADER_BOOT_OF      BUTTON_LEFT
  60
  61 #elif CONFIG_KEYPAD == MROBE100_PAD
  62 #define BOOTLOADER_BOOT_OF      BUTTON_POWER
  63
  64 #elif CONFIG_KEYPAD == PHILIPS_SA9200_PAD
  65 #define BOOTLOADER_BOOT_OF      BUTTON_VOL_UP
  66
  67 #elif CONFIG_KEYPAD == PHILIPS_HDD1630_PAD
  68 #define BOOTLOADER_BOOT_OF      BUTTON_MENU
  69
  70 #endif
  71
  72 /* Maximum allowed firmware image size. 10MB is more than enough */
  73 #define MAX_LOADSIZE (10*1024*1024)
  74
  75 /* A buffer to load the original firmware or Rockbox into */
  76 unsigned char *loadbuffer = (unsigned char *)DRAM_START;
  77
  78 /* Bootloader version */
  79 char version[] = APPSVERSION;
  80
  81 /* Locations and sizes in hidden partition on Sansa */
  82 #if defined(HAVE_ATA_SD)
  83 #define PPMI_SECTOR_OFFSET  1024
  84 #define PPMI_SECTORS        1
  85 #define MI4_HEADER_SECTORS  1
  86 #define NUM_PARTITIONS      2
  87
  88 #else
  89 #define NUM_PARTITIONS      1
  90
  91 #endif
  92
  93 #define MI4_HEADER_SIZE     0x200
  94
  95 /* mi4 header structure */
  96 struct mi4header_t {
  97     unsigned char magic[4];
  98     uint32_t version;
  99     uint32_t length;
 100     uint32_t crc32;
 101     uint32_t enctype;
 102     uint32_t mi4size;
 103     uint32_t plaintext;
 104     uint32_t dsa_key[10];
 105     uint32_t pad[109];
 106     unsigned char type[4];
 107     unsigned char model[4];
 108 };
 109
 110 /* PPMI header structure */
 111 struct ppmi_header_t {
 112     unsigned char magic[4];
 113     uint32_t length;
 114     uint32_t pad[126];
 115 };
 116
 117 inline unsigned int le2int(unsigned char* buf)
 118 {
 119    int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
 120
 121    return res;
 122 }
 123
 124 inline void int2le(unsigned int val, unsigned char* addr)
 125 {
 126     addr[0] = val & 0xFF;
 127     addr[1] = (val >> 8) & 0xff;
 128     addr[2] = (val >> 16) & 0xff;
 129     addr[3] = (val >> 24) & 0xff;
 130 }
 131
 132 struct tea_key {
 133   const char * name;
 134   uint32_t     key[4];
 135 };
 136
 137 #define NUM_KEYS (sizeof(tea_keytable)/sizeof(tea_keytable[0]))
 138 struct tea_key tea_keytable[] = {
 139   { "default" ,          { 0x20d36cc0, 0x10e8c07d, 0xc0e7dcaa, 0x107eb080 } },
 140   { "sansa",             { 0xe494e96e, 0x3ee32966, 0x6f48512b, 0xa93fbb42 } },
 141   { "sansa_gh",          { 0xd7b10538, 0xc662945b, 0x1b3fce68, 0xf389c0e6 } },
 142   { "sansa_103",         { 0x1d29ddc0, 0x2579c2cd, 0xce339e1a, 0x75465dfe } },
 143   { "rhapsody",          { 0x7aa9c8dc, 0xbed0a82a, 0x16204cc7, 0x5904ef38 } },
 144   { "p610",              { 0x950e83dc, 0xec4907f9, 0x023734b9, 0x10cfb7c7 } },
 145   { "p640",              { 0x220c5f23, 0xd04df68e, 0x431b5e25, 0x4dcc1fa1 } },
 146   { "virgin",            { 0xe83c29a1, 0x04862973, 0xa9b3f0d4, 0x38be2a9c } },
 147   { "20gc_eng",          { 0x0240772c, 0x6f3329b5, 0x3ec9a6c5, 0xb0c9e493 } },
 148   { "20gc_fre",          { 0xbede8817, 0xb23bfe4f, 0x80aa682d, 0xd13f598c } },
 149   { "elio_p722",         { 0x6af3b9f8, 0x777483f5, 0xae8181cc, 0xfa6d8a84 } },
 150   { "c200",              { 0xbf2d06fa, 0xf0e23d59, 0x29738132, 0xe2d04ca7 } },
 151   { "c200_103",          { 0x2a7968de, 0x15127979, 0x142e60a7, 0xe49c1893 } },
 152   { "c200_106",          { 0xa913d139, 0xf842f398, 0x3e03f1a6, 0x060ee012 } },
 153   { "view",              { 0x70e19bda, 0x0c69ea7d, 0x2b8b1ad1, 0xe9767ced } },
 154   { "sa9200",            { 0x33ea0236, 0x9247bdc5, 0xdfaedf9f, 0xd67c9d30 } },
 155   { "hdd1630",           { 0x04543ced, 0xcebfdbad, 0xf7477872, 0x0d12342e } },
 156 };
 157
 158 /*
 159
 160 tea_decrypt() from http://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm
 161
 162 "Following is an adaptation of the reference encryption and decryption
 163 routines in C, released into the public domain by David Wheeler and
 164 Roger Needham:"
 165
 166 */
 167
 168 /* NOTE: The mi4 version of TEA uses a different initial value to sum compared
 169          to the reference implementation and the main loop is 8 iterations, not
 170          32.
 171 */
 172
 173 static void tea_decrypt(uint32_t* v0, uint32_t* v1, uint32_t* k) {
 174     uint32_t sum=0xF1BBCDC8, i;                    /* set up */
 175     uint32_t delta=0x9E3779B9;                     /* a key schedule constant */
 176     uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3];   /* cache key */
 177     for(i=0; i<8; i++) {                               /* basic cycle start */
 178         *v1 -= ((*v0<<4) + k2) ^ (*v0 + sum) ^ ((*v0>>5) + k3);
 179         *v0 -= ((*v1<<4) + k0) ^ (*v1 + sum) ^ ((*v1>>5) + k1);
 180         sum -= delta;                                   /* end cycle */
 181     }
 182 }
 183
 184 /* mi4 files are encrypted in 64-bit blocks (two little-endian 32-bit
 185    integers) and the key is incremented after each block
 186  */
 187
 188 static void tea_decrypt_buf(unsigned char* src, unsigned char* dest, size_t n, uint32_t * key)
 189 {
 190     uint32_t v0, v1;
 191     unsigned int i;
 192
 193     for (i = 0; i < (n / 8); i++) {
 194         v0 = le2int(src);
 195         v1 = le2int(src+4);
 196
 197         tea_decrypt(&v0, &v1, key);
 198
 199         int2le(v0, dest);
 200         int2le(v1, dest+4);
 201
 202         src += 8;
 203         dest += 8;
 204
 205         /* Now increment the key */
 206         key[0]++;
 207         if (key[0]==0) {
 208             key[1]++;
 209             if (key[1]==0) {
 210                 key[2]++;
 211                 if (key[2]==0) {
 212                     key[3]++;
 213                 }
 214             }
 215         }
 216     }
 217 }
 218
 219 static inline bool tea_test_key(unsigned char magic_enc[8], uint32_t * key, int unaligned)
 220 {
 221     unsigned char magic_dec[8];
 222     tea_decrypt_buf(magic_enc, magic_dec, 8, key);
 223
 224     return (le2int(&magic_dec[4*unaligned]) == 0xaa55aa55);
 225 }
 226
 227 static int tea_find_key(struct mi4header_t *mi4header, int fd)
 228 {
 229     unsigned int i;
 230     int rc;
 231     unsigned int j;
 232     uint32_t key[4];
 233     unsigned char magic_enc[8];
 234     int key_found = -1;
 235     unsigned int magic_location = mi4header->length-4;
 236     int unaligned = 0;
 237
 238     if ( (magic_location % 8) != 0 )
 239     {
 240         unaligned = 1;
 241         magic_location -= 4;
 242     }
 243
 244     /* Load encrypted magic 0xaa55aa55 to check key */
 245     lseek(fd, MI4_HEADER_SIZE + magic_location, SEEK_SET);
 246     rc = read(fd, magic_enc, 8);
 247     if(rc < 8 )
 248         return EREAD_IMAGE_FAILED;
 249
 250     printf("Searching for key:");
 251
 252     for (i=0; i < NUM_KEYS && (key_found<0) ; i++) {
 253         key[0] = tea_keytable[i].key[0];
 254         key[1] = tea_keytable[i].key[1];
 255         key[2] = tea_keytable[i].key[2];
 256         key[3] = tea_keytable[i].key[3];
 257
 258         /* Now increment the key */
 259         for(j=0; j<((magic_location-mi4header->plaintext)/8); j++){
 260             key[0]++;
 261             if (key[0]==0) {
 262                 key[1]++;
 263                 if (key[1]==0) {
 264                     key[2]++;
 265                     if (key[2]==0) {
 266                         key[3]++;
 267                     }
 268                 }
 269             }
 270         }
 271
 272         if (tea_test_key(magic_enc,key,unaligned))
 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),"/.rockbox/%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         return EFILE_TOO_BIG;
 311
 312     /* CRC32 */
 313     printf("CRC32: %x", mi4header.crc32);
 314
 315     /* Rockbox model id */
 316     printf("Model id: %.4s", mi4header.model);
 317
 318     /* Read binary type (RBOS, RBBL) */
 319     printf("Binary type: %.4s", mi4header.type);
 320
 321     /* Load firmware file */
 322     lseek(fd, MI4_HEADER_SIZE, SEEK_SET);
 323     rc = read(fd, buf, mi4header.mi4size-MI4_HEADER_SIZE);
 324     if(rc < (int)mi4header.mi4size-MI4_HEADER_SIZE)
 325         return EREAD_IMAGE_FAILED;
 326
 327     /* Check CRC32 to see if we have a valid file */
 328     sum = chksum_crc32 (buf, mi4header.mi4size - MI4_HEADER_SIZE);
 329
 330     printf("Calculated CRC32: %x", sum);
 331
 332     if(sum != mi4header.crc32)
 333         return EBAD_CHKSUM;
 334
 335     if( (mi4header.plaintext + MI4_HEADER_SIZE) != mi4header.mi4size)
 336     {
 337         /* Load encrypted firmware */
 338         int key_index = tea_find_key(&mi4header, fd);
 339
 340         if (key_index < 0)
 341             return EINVALID_FORMAT;
 342
 343         /* Plaintext part is already loaded */
 344         buf += mi4header.plaintext;
 345
 346         /* Decrypt in-place */
 347         tea_decrypt_buf(buf, buf,
 348                         mi4header.mi4size-(mi4header.plaintext+MI4_HEADER_SIZE),
 349                         tea_keytable[key_index].key);
 350
 351         printf("%s key used", tea_keytable[key_index].name);
 352
 353         /* Check decryption was successfull */
 354         if(le2int(&buf[mi4header.length-mi4header.plaintext-4]) != 0xaa55aa55)
 355         {
 356             return EREAD_IMAGE_FAILED;
 357         }
 358     }
 359
 360     return EOK;
 361 }
 362
 363 #if defined(HAVE_ATA_SD)
 364 /* Load mi4 firmware from a hidden disk partition */
 365 int load_mi4_part(unsigned char* buf, struct partinfo* pinfo,
 366                   unsigned int buffer_size, bool disable_rebuild)
 367 {
 368     struct mi4header_t mi4header;
 369     struct ppmi_header_t ppmi_header;
 370     unsigned long sum;
 371
 372     /* Read header to find out how long the mi4 file is. */
 373     ata_read_sectors(IF_MV2(0,) pinfo->start + PPMI_SECTOR_OFFSET,
 374                             PPMI_SECTORS, &ppmi_header);
 375
 376     /* The first four characters at 0x80000 (sector 1024) should be PPMI*/
 377     if( memcmp(ppmi_header.magic, "PPMI", 4) )
 378         return EFILE_NOT_FOUND;
 379
 380     printf("BL mi4 size: %x", ppmi_header.length);
 381
 382     /* Read mi4 header of the OF */
 383     ata_read_sectors(IF_MV2(0,) pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
 384                        + (ppmi_header.length/512), MI4_HEADER_SECTORS, &mi4header);
 385
 386     /* We don't support encrypted mi4 files yet */
 387     if( (mi4header.plaintext) != (mi4header.mi4size-MI4_HEADER_SIZE))
 388         return EINVALID_FORMAT;
 389
 390     /* MI4 file size */
 391     printf("OF mi4 size: %x", mi4header.mi4size);
 392
 393     if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
 394         return EFILE_TOO_BIG;
 395
 396     /* CRC32 */
 397     printf("CRC32: %x", mi4header.crc32);
 398
 399     /* Rockbox model id */
 400     printf("Model id: %.4s", mi4header.model);
 401
 402     /* Read binary type (RBOS, RBBL) */
 403     printf("Binary type: %.4s", mi4header.type);
 404
 405     /* Load firmware */
 406     ata_read_sectors(IF_MV2(0,) pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
 407                         + (ppmi_header.length/512) + MI4_HEADER_SECTORS,
 408                         (mi4header.mi4size-MI4_HEADER_SIZE)/512, buf);
 409
 410     /* Check CRC32 to see if we have a valid file */
 411     sum = chksum_crc32 (buf,mi4header.mi4size-MI4_HEADER_SIZE);
 412
 413     printf("Calculated CRC32: %x", sum);
 414
 415     if(sum != mi4header.crc32)
 416         return EBAD_CHKSUM;
 417
 418 #ifdef SANSA_E200
 419     if (disable_rebuild)
 420     {
 421         char block[512];
 422
 423         printf("Disabling database rebuild");
 424
 425         ata_read_sectors(IF_MV2(0,) pinfo->start + 0x3c08, 1, block);
 426         block[0xe1] = 0;
 427         ata_write_sectors(IF_MV2(0,) pinfo->start + 0x3c08, 1, block);
 428     }
 429 #else
 430     (void) disable_rebuild;
 431 #endif
 432
 433     return EOK;
 434 }
 435 #endif
 436
 437 void* main(void)
 438 {
 439     int i;
 440     int btn;
 441     int rc;
 442     int num_partitions;
 443     struct partinfo* pinfo;
 444 #if defined(SANSA_E200) || defined(SANSA_C200) || defined(PHILIPS_SA9200)
 445     int usb_retry = 0;
 446     bool usb = false;
 447 #else
 448     char buf[256];
 449     unsigned short* identify_info;
 450 #endif
 451
 452     chksum_crc32gentab ();
 453
 454     system_init();
 455     kernel_init();
 456
 457     lcd_init();
 458
 459     font_init();
 460     show_logo();
 461
 462     button_init();
 463 #if defined(SANSA_E200) || defined(PHILIPS_SA9200)
 464     i2c_init();
 465     _backlight_on();
 466 #endif
 467
 468     if (button_hold())
 469     {
 470         verbose = true;
 471         lcd_clear_display();
 472         printf("Hold switch on");
 473         printf("Shutting down...");
 474         sleep(HZ);
 475         power_off();
 476     }
 477
 478     btn = button_read_device();
 479
 480     /* Enable bootloader messages if any button is pressed */
 481     if (btn) {
 482         lcd_clear_display();
 483         verbose = true;
 484     }
 485
 486 #if defined(SANSA_E200) || defined(SANSA_C200) || defined(PHILIPS_SA9200)
 487 #if !defined(USE_ROCKBOX_USB)
 488     usb_init();
 489     while (usb_drv_powered() && usb_retry < 5 && !usb)
 490     {
 491         usb_retry++;
 492         sleep(HZ/4);
 493         usb = (usb_detect() == USB_INSERTED);
 494     }
 495     if (usb)
 496         btn |= BOOTLOADER_BOOT_OF;
 497 #endif /* USE_ROCKBOX_USB */
 498 #endif
 499
 500     lcd_setfont(FONT_SYSFIXED);
 501
 502     printf("Rockbox boot loader");
 503     printf("Version: %s", version);
 504     printf(MODEL_NAME);
 505
 506     i=ata_init();
 507 #if !defined(HAVE_ATA_SD)
 508     if (i==0) {
 509         identify_info=ata_get_identify();
 510         /* Show model */
 511         for (i=0; i < 20; i++) {
 512             ((unsigned short*)buf)[i]=htobe16(identify_info[i+27]);
 513         }
 514         buf[40]=0;
 515         for (i=39; i && buf[i]==' '; i--) {
 516             buf[i]=0;
 517         }
 518         printf(buf);
 519     } else {
 520         error(EATA, i);
 521     }
 522 #endif
 523
 524     disk_init(IF_MV(0));
 525     num_partitions = disk_mount_all();
 526     if (num_partitions<=0)
 527     {
 528         error(EDISK,num_partitions);
 529     }
 530
 531     /* Just list the first 2 partitions since we don't have any devices yet
 532        that have more than that */
 533     for(i=0; i<NUM_PARTITIONS; i++)
 534     {
 535         pinfo = disk_partinfo(i);
 536         printf("Partition %d: 0x%02x %ld MB",
 537                 i, pinfo->type, pinfo->size / 2048);
 538     }
 539
 540     if(btn & BOOTLOADER_BOOT_OF)
 541     {
 542         /* Load original mi4 firmware in to a memory buffer called loadbuffer.
 543            The rest of the loading is done in crt0.S.
 544            1) First try reading from the hidden partition (on Sansa only).
 545            2) Next try a decrypted mi4 file in /System/OF.mi4
 546            3) Finally, try a raw firmware binary in /System/OF.mi4. It should be
 547               a mi4 firmware decrypted and header stripped using mi4code.
 548         */
 549         printf("Loading original firmware...");
 550
 551 #if defined(HAVE_ATA_SD)
 552         /* First try a (hidden) firmware partition */
 553         printf("Trying firmware partition");
 554         pinfo = disk_partinfo(1);
 555         if(pinfo->type == PARTITION_TYPE_OS2_HIDDEN_C_DRIVE)
 556         {
 557             rc = load_mi4_part(loadbuffer, pinfo, MAX_LOADSIZE, usb);
 558             if (rc < EOK) {
 559                 printf("Can't load from partition");
 560                 printf(strerror(rc));
 561             } else {
 562                 return (void*)loadbuffer;
 563             }
 564         } else {
 565             printf("No hidden partition found.");
 566         }
 567 #endif
 568
 569         printf("Trying /System/OF.mi4");
 570         rc=load_mi4(loadbuffer, "/System/OF.mi4", MAX_LOADSIZE);
 571         if (rc < EOK) {
 572             printf("Can't load /System/OF.mi4");
 573             printf(strerror(rc));
 574         } else {
 575             return (void*)loadbuffer;
 576         }
 577
 578         printf("Trying /System/OF.bin");
 579         rc=load_raw_firmware(loadbuffer, "/System/OF.bin", MAX_LOADSIZE);
 580         if (rc < EOK) {
 581             printf("Can't load /System/OF.bin");
 582             printf(strerror(rc));
 583         } else {
 584             return (void*)loadbuffer;
 585         }
 586
 587         error(0, 0);
 588
 589     } else {
 590 #if 0 /* e200: enable to be able to dump the hidden partition */
 591         if(btn & BUTTON_UP)
 592         {
 593             int fd;
 594             pinfo = disk_partinfo(1);
 595             fd = open("/part.bin", O_CREAT|O_RDWR);
 596             char sector[512];
 597             for(i=0; i<40960; i++){
 598                 if (!(i%100))
 599                 {
 600                     printf("dumping sector %d", i);
 601                 }
 602                 ata_read_sectors(IF_MV2(0,) pinfo->start + i, 1, sector);
 603                 write(fd,sector,512);
 604             }
 605             close(fd);
 606         }
 607 #endif
 608         printf("Loading Rockbox...");
 609         rc=load_mi4(loadbuffer, BOOTFILE, MAX_LOADSIZE);
 610         if (rc < EOK) {
 611             printf("Can't load %s:", BOOTFILE);
 612             printf(strerror(rc));
 613
 614 #ifdef OLD_BOOTFILE
 615             /* Try loading rockbox from old rockbox.e200/rockbox.h10 format */
 616             rc=load_firmware(loadbuffer, OLD_BOOTFILE, MAX_LOADSIZE);
 617             if (rc < EOK) {
 618                 printf("Can't load %s:", OLD_BOOTFILE);
 619                 error(EBOOTFILE, rc);
 620             }
 621 #endif
 622         }
 623     }
 624
 625     return (void*)loadbuffer;
 626 }
 627
 628 #if !defined(SANSA_E200) && !defined(SANSA_C200) && !defined(PHILIPS_SA9200)
 629 /* These functions are present in the firmware library, but we reimplement
 630    them here because the originals do a lot more than we want */
 631 void usb_acknowledge(void)
 632 {
 633 }
 634
 635 void usb_wait_for_disconnect(void)
 636 {
 637 }
 638 #endif
 639