tools/mkmi4.sh

   1 #!/bin/sh
   2 #             __________               __   ___.
   3 #   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4 #   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5 #   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6 #   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7 #                     \/            \/     \/    \/            \/
   8 # $Id$
   9 #
  10 # Purpose of this script:
  11 #
  12 # Inputs: music player model name and a file name
  13 #
  14 # Action: Build a valid mi4 file (prepending and appending magic)
  15 #         Encrypt the file with TEA encryption so that the model's own
  16 #         bootloader accepts this file.
  17 #         Sign the file with a DSA signature the bootloader accepts
  18 #
  19 # Output: A built, encrypted and signed mi4 file image.
  20 #
  21 # Requirement:
  22 #
  23 # This script assumes that you have the mi4code tool in your path, that
  24 # you have the environment variable MI4CODE pointing to the tool or that you
  25 # have it in the same dir that you invoke this script with.
  26 #
  27 # mi4 info and tool are here: http://daniel.haxx.se/sansa/mi4.html
  28 #
  29
  30 mkmi4=$0
  31 target=$1
  32 input=$2
  33 output=$3
  34
  35 # scan the $PATH for the given command
  36 findtool(){
  37   file="$1"
  38
  39   IFS=":"
  40   for path in $PATH
  41   do
  42     # echo "checks for $file in $path" >&2
  43     if test -f "$path/$file"; then
  44       echo "$path/$file"
  45       return
  46     fi
  47   done
  48 }
  49
  50 help () {
  51   echo "Usage: mi4fix.sh <e200/h10/h10_5gb/elio> <input> <output>"
  52   exit
  53 }
  54
  55 if test -z "$output"; then
  56   help
  57 fi
  58
  59 # sign - if the firmware should be DSA signed with a dummy (only 010301
  60 #        firmwares)
  61 # tea -  name of the TEA crypt key to use for encrypting, but only if ...
  62 # encrypt - is set to "yes" for encrypting the firmware
  63 case $target in
  64  # fake example)
  65  #   sign="yes"
  66  #   encrypt="yes"
  67  #   tea=targetkey
  68  #   ;;
  69   e200)
  70     sign="yes"
  71     ;;
  72   h10)
  73     sign="yes"
  74     ;;
  75   h10_5gb)
  76     buildopt="-2"
  77     ;;
  78   elio)
  79     buildopt="-2"
  80     ;;
  81   *)
  82     echo "unsupported target"
  83     help
  84     ;;
  85 esac
  86
  87 if test -z "$MI4CODE"; then
  88   tool=`findtool mi4code`
  89   if test -z "$tool"; then
  90     # not in path
  91     tool=`dirname $mkmi4`/mi4code
  92     if ! test -f $tool; then
  93       echo "Couldn't find mi4code"
  94       exit
  95     fi
  96   fi
  97 else
  98   tool=$MI4CODE
  99 fi
 100
 101 # Use full file plaintext length if not encrypting
 102 if test -z "$encrypt"; then
 103   buildopt="$buildopt -pall"
 104 fi
 105
 106 # build mi4
 107 #echo "$tool build $input $output.raw"
 108 $tool build $buildopt $input $output.raw
 109 # encrypt
 110 if test -n "$encrypt"; then
 111   #echo "$tool encrypt $output.raw $output.encrypt $tea"
 112   $tool encrypt $output.raw $output.encrypt $tea
 113 else
 114   # Even if we don't encrypt we need to do this to ensure the crc gets fixed
 115   $tool encrypt -pall $output.raw $output.encrypt default
 116 fi
 117 # sign
 118 if test -n "$sign"; then
 119   #echo "$tool sign $output.encrypt $output"
 120   $tool sign $output.encrypt $output
 121 else
 122   mv $output.encrypt $output
 123 fi