util/chromeos/extract_blobs.sh

   1 #!/usr/bin/env bash
   2 #
   3 # SPDX-License-Identifier: GPL-2.0-only
   4
   5 if [ ! -f "$1" ]; then
   6         echo "Error: You must provide a valid filename"
   7         exit 1
   8 fi
   9
  10 IMAGE=$1
  11 # create new dir '$IMAGE-blobs' (less file extension)
  12 DIR=$(basename $IMAGE)
  13 DIR="${DIR%.*}-blobs"
  14 mkdir -p $DIR
  15
  16 if [ -f ./cbfstool ]; then
  17         CBFSTOOL="./cbfstool"
  18 else
  19         CBFSTOOL=$(command -v cbfstool)
  20 fi
  21 if [[ "$CBFSTOOL" = "" ]]; then
  22         echo "Error: cbfstool must be in your path or exist locally"
  23         exit 1
  24 fi
  25
  26 if [ -f ./ifdtool ]; then
  27         IFDTOOL="./ifdtool"
  28 else
  29         IFDTOOL=$(which ifdtool)
  30 fi
  31 if [[ "$IFDTOOL" = "" ]]; then
  32         echo "Error: ifdtool must be in your path or exist locally"
  33         exit 1
  34 fi
  35
  36 # ensure valid coreboot image / get list of main COREBOOT CBFS contents
  37 REGION=""
  38 if ! $CBFSTOOL $IMAGE print >$DIR/cbfs.txt 2>/dev/null; then
  39         # try using BOOT_STUB region
  40         if ! $CBFSTOOL $IMAGE print -r BOOT_STUB >$DIR/cbfs.txt; then
  41                 echo "Error reading CBFS: $IMAGE is not a valid coreboot image"
  42                 exit 1
  43         else
  44                 REGION="-r BOOT_STUB"
  45         fi
  46 fi
  47
  48 echo ""
  49 echo "Extracting blobs..."
  50 echo ""
  51
  52 # extract flash regions
  53 if ! $IFDTOOL -x $IMAGE >/dev/null; then
  54         echo "Error reading flash descriptor/extracting flash regions"
  55         exit 1
  56 fi
  57 # rename to normal convention; drop unused regions
  58 mv flashregion_0_flashdescriptor.bin $DIR/flashdescriptor.bin
  59 [ -f flashregion_2_intel_me.bin ] && mv flashregion_2_intel_me.bin $DIR/me.bin
  60 rm flashregion_*.bin
  61
  62 # extract microcode
  63 $CBFSTOOL $IMAGE extract $REGION -n cpu_microcode_blob.bin -f $DIR/cpu_microcode_blob.bin
  64
  65 # extract VGA BIOS
  66 VGA=$(grep pci $DIR/cbfs.txt | cut -f1 -d\ )
  67 if [ "$VGA" != "" ]; then
  68         $CBFSTOOL $IMAGE extract $REGION -n $VGA -f $DIR/vgabios.bin
  69 fi
  70
  71 # extract MRC.bin
  72 MRC=$(grep mrc.bin $DIR/cbfs.txt | cut -f1 -d\ )
  73 if [ "$MRC" != "" ]; then
  74         $CBFSTOOL $IMAGE extract $REGION -n "$MRC" -f "$DIR/$MRC"
  75 fi
  76
  77 # extract refcode
  78 REF=$(grep refcode $DIR/cbfs.txt | cut -f1 -d\ )
  79 if [ "$REF" != "" ]; then
  80         $CBFSTOOL $IMAGE extract $REGION -n fallback/refcode -f "$DIR/refcode.elf" -m x86
  81 fi
  82
  83 # extract FSP blobs
  84 for FSP in $(grep fsp $DIR/cbfs.txt | cut -f1 -d\ ); do
  85         $CBFSTOOL $IMAGE extract $REGION -n $FSP -f $DIR/$FSP
  86 done
  87
  88 # extract audio blobs
  89 for AUD in $(grep -e "-2ch-" -e "-4ch-" $DIR/cbfs.txt | cut -f1 -d\ ); do
  90         $CBFSTOOL $IMAGE extract $REGION -n $AUD -f $DIR/$AUD
  91 done
  92
  93 # extract VBTs
  94 for VBT in $(grep vbt $DIR/cbfs.txt | cut -f1 -d\ ); do
  95         $CBFSTOOL $IMAGE extract $REGION -n $VBT -f $DIR/$VBT
  96 done
  97
  98 # extract IFWI
  99 IFWI=$(cbfstool $IMAGE layout -w | grep IFWI)
 100 if [ "$IFWI" != "" ]; then
 101         $CBFSTOOL $IMAGE read -r IFWI -f $DIR/ifwi.bin
 102 fi
 103
 104 # generate hashes
 105 (
 106         cd $DIR
 107         : >hashes.txt
 108         for FILE in $(ls *.{bin,elf} 2>/dev/null); do
 109                 sha256sum $FILE >>hashes.txt
 110         done
 111 )
 112
 113 # a little housekeeping
 114 rm $DIR/cbfs.txt
 115
 116 echo ""
 117 echo "All done"