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5cce937393
I based this script on the Coreboot docs: https://doc.coreboot.org/northbridge/intel/haswell/mrc.bin.html. While adding an integrity check to ensure we're obtaining the correct blob. Also, it's worth surfacing that the SHA-1 for the resulting binary is the same SHA that Libreboot uses in their integrity check: https://notabug.org/libreboot/lbmk/src/master/resources/scripts/download/mrc#L95. However, I elected to use SHA-256 for extra paranoia.
39 lines
1.0 KiB
Bash
Executable File
39 lines
1.0 KiB
Bash
Executable File
#!/bin/bash
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set -e
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function usage() {
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echo -n \
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"Usage: $(basename "$0")
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Obtain mrc.bin from a Haswell Chromebook firmware image.
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"
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}
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MRC_BIN_HASH="d368ba45096a3b5490ed27014e1f9004bc363434ffdce0c368c08a89c4746722"
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if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
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if [[ "${1:-}" == "--help" ]]; then
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usage
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else
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BLOB_DIR="$(cd "$(dirname "$0")" && pwd)"
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COREBOOT_DIR="$(find "${BLOB_DIR}/../../build/x86/" -maxdepth 1 -type d -name 'coreboot-*')"
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pushd "${COREBOOT_DIR}"
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# https://doc.coreboot.org/northbridge/intel/haswell/mrc.bin.html#obtaining-mrc-bin
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make -C util/cbfstool
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cd util/chromeos
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./crosfirmware.sh peppy
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../cbfstool/cbfstool coreboot-*.bin extract -f mrc.bin -n mrc.bin -r RO_SECTION
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if ! echo "${MRC_BIN_HASH} mrc.bin" | sha256sum --check; then
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echo "SHA256 checksum for mrc.bin doesn't match."
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exit 1
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fi
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popd
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mv "${COREBOOT_DIR}/util/chromeos/mrc.bin" "$(dirname "$0")/mrc.bin"
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fi
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fi
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