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#!/usr/bin/env bash
# script to automate extracting blobs from an existing vendor bios
# SPDX-FileCopyrightText: 2022 Caleb La Grange <thonkpeasant@protonmail.com>
# SPDX-FileCopyrightText: 2023 Leah Rowe <leah@libreboot.org>
# SPDX-License-Identifier: GPL-3.0-only
sname=""
board=""
vendor_rom=""
cbdir="coreboot/default"
cbcfgsdir="resources/coreboot"
ifdtool="${cbdir}/util/ifdtool/ifdtool"
mecleaner="me_cleaner/me_cleaner.py"
me7updateparser="resources/blobs/me7_update_parser.py"
boarddir=""
CONFIG_HAVE_MRC=""
CONFIG_ME_BIN_PATH=""
CONFIG_GBE_BIN_PATH=""
CONFIG_IFD_BIN_PATH=""
_me_destination=""
_gbe_destination=""
_ifd_destination=""
main()
{
sname=${0}
if [ $# -lt 2 ]; then
fail "Missing arguments (less than two)."
fi
board="${1}"
vendor_rom="${2}"
boarddir="${cbcfgsdir}/${board}"
check_board
build_dependencies
extract_blobs
}
check_board()
{
if [ ! -f "${vendor_rom}" ] ; then
fail "file does not exist: ${vendor_rom}"
elif [ ! -d "${boarddir}" ]; then
fail "build/roms ${board}: target not defined"
elif [ ! -f "${boarddir}/board.cfg" ]; then
fail "build/roms ${board}: missing board.cfg"
fi
}
build_dependencies()
{
if [ ! -d me_cleaner ]; then
printf "downloading me_cleaner\n"
./download me_cleaner || fail 'could not download me_cleaner'
else
printf "me_cleaner already downloaded. Skipping.\n"
printf "run ./download me_cleaner to manually overwrite\n"
fi
if [ ! -d ${cbdir} ]; then
printf "downloading coreboot\n"
./download coreboot default \
|| fail "could not download coreboot"
else
printf "coreboot already downloaded. Skipping.\n"
printf "run ./download coreboot to manually overwrite\n"
fi
if ! [ -f ${ifdtool} ]; then
printf "building ifdtool from coreboot\n"
make -C "${ifdtool%/ifdtool}" \
|| fail "could not build ifdtool"
fi
}
extract_blobs()
{
printf "extracting blobs for %s from %s\n" ${board} ${vendor_rom}
set -- "${boarddir}/config/"*
. ${1} 2>/dev/null
. "${boarddir}/board.cfg"
if [ "$CONFIG_HAVE_MRC" = "y" ]; then
printf 'haswell board detected, downloading mrc\n'
./download mrc || fail "could not download mrc"
fi
_me_destination=${CONFIG_ME_BIN_PATH#../../}
_gbe_destination=${CONFIG_GBE_BIN_PATH#../../}
_ifd_destination=${CONFIG_IFD_BIN_PATH#../../}
extract_blob_intel_me
extract_blob_intel_gbe_nvm
# Cleans up other files extracted with ifdtool
rm -f flashregion*.bin 2> /dev/null
if [ -f ${_ifd_destination} ]; then
printf "gbe, ifd, and me extracted to %s\n" \
${_me_destination%/*}
else
printf "WARNING: Intel firmware descriptor could not "
printf "be extracted with modified me\n"
fi
}
extract_blob_intel_me()
{
printf "extracting clean ime and modified ifd\n"
${mecleaner} -D ${_ifd_destination} \
-M ${_me_destination} ${vendor_rom} -t -r -S \
|| ${me7updateparser} \
-O ${_me_destination} ${vendor_rom} \
|| fail \
"me_cleaner failed to extract blobs from rom"
}
extract_blob_intel_gbe_nvm()
{
printf "extracting gigabit ethernet firmware"
./${ifdtool} -x ${vendor_rom}
mv flashregion*gbe.bin ${_gbe_destination} \
|| fail 'could not extract gbe'
}
fail()
{
print_help
printf "\n%s: ERROR: %s\n" ${sname} $@
exit 1
}
print_help()
{
printf "Usage: ./blobutil extract {boardname} {path/to/vendor_rom}\n"
printf "Example: ./blobutil extract x230 12mb_flash.bin\n"
printf "\nYou need to specify exactly 2 arguments\n"
}
main $@
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