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#!/usr/bin/env sh
# Download Intel MRC images
#
# 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, version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
[ "x${DEBUG+set}" = 'xset' ] && set -v
set -u -e
export PATH="${PATH}:/sbin"
# This file is forked from util/chromeos/crosfirmware.sh in coreboot cfc26ce278
# Changes to it in *this version* are copyright 2021 and 2023 Leah Rowe, under
# the same license as above.
# use updated manifest from wayback machine, when updating mrc.bin,
# and update the other variables below accordingly. current manifest used:
# https://web.archive.org/web/20210211071412/https://dl.google.com/dl/edgedl/chromeos/recovery/recovery.conf
# the wayback machine is used so that we get the same manifest. google
# does not seem to version the manifest, but archives are available
# variables taken from that manifest:
_board="peppy"
_file="chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin"
_url="https://dl.google.com/dl/edgedl/chromeos/recovery/chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin.zip"
_url2="https://web.archive.org/web/20200516070928/https://dl.google.com/dl/edgedl/chromeos/recovery/chromeos_12239.92.0_peppy_recovery_stable-channel_mp-v3.bin.zip"
_sha1sum="cd5917cbe7f821ad769bf0fd87046898f9e175c8"
_mrc_complete_hash="d18de1e3d52c0815b82ea406ca07897c56c65696"
_mrc_complete="mrc/haswell/mrc.bin"
cbdir="coreboot/default"
cbfstool="${cbdir}/util/cbfstool/cbfstool"
sname=""
main()
{
sname=${0}
printf "Downloading Intel MRC blobs\n"
check_existing && exit 0
build_dependencies || fail "could not build dependencies"
fetch_mrc || fail "could not fetch mrc.bin"
}
check_existing()
{
if [ ! -f ${_mrc_complete} ]; then
return 1
fi
printf 'found existing mrc.bin, checking its hash\n'
if [ "$(sha1sum ${_mrc_complete} | awk '{print $1}')" \
= "${_mrc_complete_hash}" ]; then
printf 'checksums matched, skipping downloading\n'
return 0
else
printf 'hashes did not match, starting over\n'
return 1
fi
}
build_dependencies()
{
if [ ! -d "${cbdir}/" ]; then
./download coreboot default || return 1
fi
if [ ! -f "${cbfstool}" ]; then
./build module cbutils default || return 1
fi
return 0
}
fetch_mrc()
{
mkdir -p mrc/haswell/ || return 1
(
cd mrc/haswell/
download_image ${_url} ${_file} ${_sha1sum}
if [ ! -f ${_file} ]; then
download_image ${_url2} ${_file} ${_sha1sum}
fi
if [ ! -f $_file ]; then
fail "%{_file} not downloaded / verification failed."
fi
extract_partition ROOT-A ${_file} root-a.ext2
extract_shellball root-a.ext2 chromeos-firmwareupdate-${_board}
extract_coreboot chromeos-firmwareupdate-${_board}
../../${cbfstool} coreboot-*.bin extract -f mrc.bin \
-n mrc.bin -r RO_SECTION \
|| fail "Could not fetch mrc.bin"
rm -f "chromeos-firmwareupdate-${_board}" coreboot-*.bin \
"${_file}" "root-a.ext2"
printf "\n\nmrc.bin saved to ${_mrc_complete}\n\n"
)
return 0
}
download_image()
{
url=${1}
_file=${2}
_sha1sum=${3}
echo "Downloading recovery image"
curl "$url" > "$_file.zip"
if [ "$(sha1sum ${_file}.zip | awk '{print $1}')" = "${_sha1sum}" ]
then
unzip -q "${_file}.zip"
rm "${_file}.zip"
echo "Checksum verification passed for recovery image."
return 0
else
rm "${_file}.zip"
echo "Bad checksum. Recovery image deleted."
return 1
fi
}
extract_partition()
{
NAME=${1}
FILE=${2}
ROOTFS=${3}
_bs=1024
echo "Extracting ROOT-A partition"
ROOTP=$( printf "unit\nB\nprint\nquit\n" | \
parted ${FILE} 2>/dev/null | grep ${NAME} )
START=$(( $( echo ${ROOTP} | cut -f2 -d\ | tr -d "B" ) ))
SIZE=$(( $( echo ${ROOTP} | cut -f4 -d\ | tr -d "B" ) ))
dd if=${FILE} of=${ROOTFS} bs=${_bs} skip=$(( ${START} / ${_bs} )) \
count=$(( ${SIZE} / ${_bs} )) > /dev/null
}
extract_shellball()
{
ROOTFS=${1}
SHELLBALL=${2}
echo "Extracting chromeos-firmwareupdate"
printf "cd /usr/sbin\ndump chromeos-firmwareupdate ${SHELLBALL}\nquit" \
| debugfs ${ROOTFS} > /dev/null 2>&1
}
extract_coreboot()
{
_shellball=${1}
_unpacked=$( mktemp -d )
echo "Extracting coreboot image"
sh ${_shellball} --unpack ${_unpacked} > /dev/null
_version=$( cat ${_unpacked}/VERSION | grep BIOS\ version: | \
cut -f2 -d: | tr -d \ )
cp ${_unpacked}/bios.bin coreboot-${_version}.bin
rm -r "${_unpacked}"
}
fail()
{
printf "%s: ERROR: %s\n"
${sname} ${1}
exit 1
}
main $@
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