1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
#!/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${DEBUG+set}" = 'xset' ] && set -v
set -u -e
. "include/err.sh"
export PATH="${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"
_sha512sum="340a1cd41136a3ba0de9d306db0e65f51640a2efe63aee9934f326b276adc1af0a2df80c0731c5a749161ec32546909eedfa8ba95801faeb5dcfe1aa4e0840c7"
_mrc_complete_hash="e5b6d510a5fdb6a7ba0027588dbceef363a2bf30255e9222020abbe71468822f49962d423d872cc05b37098682281c016445f6aa20f88351a134facfe5f70d5b"
_mrc_complete="mrc/haswell/mrc.bin"
# NOTE: the checksums, defined above, are actually sha-2 (sha512sum)
# but google only defines sha1 and md5. we verify with sha1sum, but then
# we use sha512sum in lbmk
cbdir="coreboot/default"
cbfstool="cbutils/default/cbfstool"
sname=""
main()
{
sname=${0}
printf "Downloading Intel MRC blobs\n"
check_existing || return 0
build_dependencies
fetch_mrc || err "could not fetch mrc.bin"
}
check_existing()
{
[ -f "${_mrc_complete}" ] || \
return 0
printf "found existing mrc.bin\n" 1>&2
[ "$(sha512sum "${_mrc_complete}" | awk '{print $1}')" \
= "${_mrc_complete_hash}" ] && \
return 1
printf "hashes did not match, starting over\n" 1>&2
}
build_dependencies()
{
[ -d "${cbdir}/" ] || ./update project trees coreboot default || \
err "build_dependencies: cannot fetch coreboot/default"
./build coreboot utils default || \
err "build_dependencies: cannot build cbutils/default"
}
fetch_mrc()
{
mkdir -p mrc/haswell/ || err "fetch_mrc: !mkdir mrc/haswell"
(
cd mrc/haswell/ || err "fetch_mrc: !cd mrc/haswell"
download_image "${_url}" "${_file}" "${_sha512sum}"
[ -f ${_file} ] || \
download_image "${_url2}" "${_file}" "${_sha512sum}"
[ -f $_file ] || \
err "fetch_mrc: ${_file} not downloaded / verification failed."
extract_partition ROOT-A "${_file}" root-a.ext2
extract_shellball root-a.ext2 chromeos-firmwareupdate-${_board}
extract_coreboot chromeos-firmwareupdate-${_board}
../../"${cbfstool}" coreboot-*.bin extract -f mrc.bin -n mrc.bin \
-r RO_SECTION || err "fetch_mrc: could not fetch mrc.bin"
rm -f "chromeos-firmwareupdate-${_board}" coreboot-*.bin \
"${_file}" "root-a.ext2" || err "fetch_mrc: cannot remove files"
printf "\n\nmrc.bin saved to ${_mrc_complete}\n\n"
)
}
download_image()
{
url=${1}
_file=${2}
_sha512sum=${3}
printf "Downloading recovery image\n"
curl --retry 3 "$url" > "$_file.zip" || err "download_image: curl failed"
printf "Verifying recovery image checksum\n"
if [ "$(sha512sum "${_file}.zip" | awk '{print $1}')" = "${_sha512sum}" ]
then
unzip -q "${_file}.zip" || err "download_image: cannot unzip"
rm -f "${_file}.zip" || err "download_image: can't rm zip {1}"
return 0
fi
rm -f "${_file}.zip" || err "download_image: bad hash, and can't rm zip"
err "download_image: Bad checksum. Recovery image deleted"
}
extract_partition()
{
NAME=${1}
FILE=${2}
ROOTFS=${3}
_bs=1024
printf "Extracting ROOT-A partition\n"
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} / ${_bs} )) || \
err "extract_partition: can't extract root file system"
}
extract_shellball()
{
ROOTFS=${1}
SHELLBALL=${2}
printf "Extracting chromeos-firmwareupdate\n"
printf "cd /usr/sbin\ndump chromeos-firmwareupdate ${SHELLBALL}\nquit" \
| debugfs "${ROOTFS}" || err "extract_shellball: debugfs"
}
extract_coreboot()
{
_shellball=${1}
_unpacked=$( mktemp -d )
printf "Extracting coreboot image\n"
[ -f "${_shellball}" ] || \
err "extract_coreboot: shellball missing in google peppy image"
sh "${_shellball}" --unpack "${_unpacked}" || \
err "extract_coreboot: shellball exits with non-zero status"
# TODO: audit the f* out of that shellball, for each mrc version.
# it has to be updated for each mrc update. we should ideally
# implement the functionality ourselves.
[ -f "${_unpacked}/VERSION" ] || \
err "extract_coreboot: VERSION file missing on google coreboot rom"
_version=$( cat "${_unpacked}/VERSION" | grep BIOS\ version: | \
cut -f2 -d: | tr -d \ )
cp "${_unpacked}/bios.bin" "coreboot-${_version}.bin" || \
err "extract_coreboot: cannot copy google peppy rom"
rm -Rf "${_unpacked}" || \
err "extract_coreboot: cannot remove extracted google peppy archive"
}
main $@
|
