tools/gigabeats.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2007 by Will Robertson
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <inttypes.h>
  23 #include <sys/stat.h>
  24
  25 /* Entry point (and load address) for the main Rockbox bootloader */
  26 #define BL_ENTRY_POINT 0x8a000000
  27
  28
  29 static FILE * openinfile( const char * filename )
  30 {
  31     FILE * F = fopen( filename, "rb" );
  32     if( F == NULL )
  33     {
  34         fprintf( stderr, "Couldn't open input file %s\n", filename );
  35         perror( "Error was " );
  36         exit( -1 );
  37     };
  38     return F;
  39 };
  40
  41 static FILE * openoutfile( const char * filename )
  42 {
  43     FILE * F = fopen( filename, "wb" );
  44     if( F == NULL )
  45     {
  46         fprintf( stderr, "Couldn't open output file %s\n", filename );
  47         perror( "Error was " );
  48         exit( -1 );
  49     };
  50     return F;
  51 };
  52
  53 static uint32_t calc_csum(const unsigned char* pb, int cb)
  54 {
  55     uint32_t l = 0;
  56     while (cb--)
  57         l += *pb++;
  58     return l;
  59 }
  60
  61 static void put_uint32le(uint32_t x, unsigned char* p)
  62 {
  63     p[0] = x & 0xff;
  64     p[1] = (x >> 8) & 0xff;
  65     p[2] = (x >> 16) & 0xff;
  66     p[3] = (x >> 24) & 0xff;
  67 }
  68
  69 int gigabeat_s_code(char *infile, char *outfile)
  70 {
  71     FILE *in, *out;
  72     unsigned int size;
  73     unsigned int newsize;
  74     unsigned char* buf;
  75
  76     in = openinfile(infile);
  77     out = openoutfile(outfile);
  78
  79     /* Step 1: Load the binary file into memory */
  80     fseek(in, 0, SEEK_END);
  81     size = ftell(in);
  82
  83     /* 15 bytes for header, 16 for signature bypass,
  84      * 12 for record header, 12 for footer */
  85     newsize = 15 + 16 + 12 + size + 12;
  86     buf = malloc(newsize);
  87     if(buf == NULL) {
  88         fprintf(stderr, "Not enough memory to perform the requested operation. Aborting.\n" );
  89         return 0;
  90     }
  91     fseek(in, 0, SEEK_SET);
  92     fread(buf + 43, size, 1, in);
  93     fclose(in);
  94
  95     /* Step 2: Create the file header */
  96     sprintf(buf, "B000FF\n");
  97     put_uint32le(0x88200000, buf+7);
  98     /* If the value below is too small, the update will attempt to flash.
  99      * Be careful when changing this (leaving it as is won't cause issues) */
 100     put_uint32le(0xCC0CD8, buf+11);
 101
 102     /* Step 3: Add the signature bypass record */
 103     put_uint32le(0x88065A10, buf+15);
 104     put_uint32le(4, buf+19);
 105     put_uint32le(0xE3A00001, buf+27);
 106     put_uint32le(calc_csum(buf+27,4), buf+23);
 107
 108     /* Step 4: Create a record for the actual code */
 109     put_uint32le(BL_ENTRY_POINT, buf+31);
 110     put_uint32le(size, buf+35);
 111     put_uint32le(calc_csum(buf + 43, size), buf+39);
 112
 113     /* Step 5: Write the footer */
 114     put_uint32le(0, buf+newsize-12);
 115     put_uint32le(BL_ENTRY_POINT, buf+newsize-8);
 116     put_uint32le(0, buf+newsize-4);
 117
 118     /* Step 6: Write the resulting file */
 119     fwrite(buf, newsize, 1, out);
 120     fclose(out);
 121
 122     fprintf(stderr, "File processed successfully\n" );
 123
 124     return(0);
 125 }