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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Will Robertson
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <sys/stat.h>
/* Entry point (and load address) for the main Rockbox bootloader */
#define BL_ENTRY_POINT 0x8a000000
static FILE * openinfile( const char * filename )
{
FILE * F = fopen( filename, "rb" );
if( F == NULL )
{
fprintf( stderr, "Couldn't open input file %s\n", filename );
perror( "Error was " );
exit( -1 );
};
return F;
}
static FILE * openoutfile( const char * filename )
{
FILE * F = fopen( filename, "wb" );
if( F == NULL )
{
fprintf( stderr, "Couldn't open output file %s\n", filename );
perror( "Error was " );
exit( -1 );
};
return F;
}
static uint32_t calc_csum(const unsigned char* pb, int cb)
{
uint32_t l = 0;
while (cb--)
l += *pb++;
return l;
}
static void put_uint32le(uint32_t x, unsigned char* p)
{
p[0] = x & 0xff;
p[1] = (x >> 8) & 0xff;
p[2] = (x >> 16) & 0xff;
p[3] = (x >> 24) & 0xff;
}
int gigabeat_s_code(char *infile, char *outfile)
{
FILE *in, *out;
unsigned int size;
unsigned int newsize;
unsigned char* buf;
size_t rc;
in = openinfile(infile);
out = openoutfile(outfile);
/* Step 1: Load the binary file into memory */
fseek(in, 0, SEEK_END);
size = ftell(in);
/* 15 bytes for header, 16 for signature bypass,
* 12 for record header, 12 for footer */
newsize = 15 + 16 + 12 + size + 12;
buf = malloc(newsize);
if(buf == NULL) {
fprintf(stderr,
"Not enough memory to perform the operation. Aborting.\n" );
return 1;
}
fseek(in, 0, SEEK_SET);
rc = fread(buf + 43, 1, size, in);
fclose(in);
if(rc != size) {
/* failed to read the wanted amount */
fprintf(stderr, "Failed reading from %s.\n", infile);
return 2;
}
/* Step 2: Create the file header */
sprintf((char *)buf, "B000FF\n");
put_uint32le(0x88200000, buf+7);
/* If the value below is too small, the update will attempt to flash.
* Be careful when changing this (leaving it as is won't cause issues) */
put_uint32le(0xCC0CD8, buf+11);
/* Step 3: Add the signature bypass record */
put_uint32le(0x88065A10, buf+15);
put_uint32le(4, buf+19);
put_uint32le(0xE3A00001, buf+27);
put_uint32le(calc_csum(buf+27,4), buf+23);
/* Step 4: Create a record for the actual code */
put_uint32le(BL_ENTRY_POINT, buf+31);
put_uint32le(size, buf+35);
put_uint32le(calc_csum(buf + 43, size), buf+39);
/* Step 5: Write the footer */
put_uint32le(0, buf+newsize-12);
put_uint32le(BL_ENTRY_POINT, buf+newsize-8);
put_uint32le(0, buf+newsize-4);
/* Step 6: Write the resulting file */
fwrite(buf, newsize, 1, out);
fclose(out);
fprintf(stderr, "File processed successfully\n" );
return(0);
}
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