#!/bin/bash -eux
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# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Refer to the Google Chrome OS Main Processor Firmware Specification for what
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# the pieces are.
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# This script generates different firmware binaries with different
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# configurations.
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# Syntax: ./firmware_boot.sh <Firmware name without .fd extension>.
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# Usage of the script.
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usage()
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{
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cat <<EOF
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$0 firmware_name
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firmware_name - name of the firmware.
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EOF
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}
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if [ $# != 1 ]; then
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usage
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exit 0
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fi
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base=$1
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input=${base}.fd
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if [ ! -f $input ]; then
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echo "$input file does not exists."
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exit 0
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fi
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# First, run dump_fmap $input | ./x to compute these values:
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# dev-mode BIOS is in firmware A
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rw_a_offset=$(dump_fmap -p ${input} | grep 'RW_SECTION_A' | cut -d' ' -f2)
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rw_a_size=$(dump_fmap -p ${input} | grep 'RW_SECTION_A' | cut -d' ' -f3)
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# normal-mode BIOS is in firmware B
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rw_b_offset=$(dump_fmap -p ${input} | grep 'RW_SECTION_B' | cut -d' ' -f2)
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rw_b_size=$(dump_fmap -p ${input} | grep 'RW_SECTION_B' | cut -d' ' -f3)
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# Extract the RW BIOS chunks
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dd if=${input} of=dev.bin bs=1 skip=${rw_a_offset} count=${rw_a_size}
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dd if=${input} of=nor.bin bs=1 skip=${rw_b_offset} count=${rw_b_size}
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# Garble one to make it fail the signature. I know that we reserve 64K at the
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# start of the section for the signature and headers, so we'll make a random
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# payload and put the normal header on the front.
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dd if=/dev/urandom of=bad.bin bs=1 count=${rw_b_size}
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dd if=nor.bin of=bad.bin conv=notrunc bs=1 count=65536
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# A:Normal B:Normal
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output=${base}-NN.fd
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cp ${input} ${output}
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dd if=nor.bin of=${output} conv=notrunc bs=1 seek=${rw_a_offset}
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dd if=nor.bin of=${output} conv=notrunc bs=1 seek=${rw_b_offset}
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# A:Dev B:Dev
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output=${base}-DD.fd
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cp ${input} ${output}
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dd if=dev.bin of=${output} conv=notrunc bs=1 seek=${rw_a_offset}
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dd if=dev.bin of=${output} conv=notrunc bs=1 seek=${rw_b_offset}
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# A:Normal B:Dev
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output=${base}-ND.fd
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cp ${input} ${output}
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dd if=nor.bin of=${output} conv=notrunc bs=1 seek=${rw_a_offset}
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dd if=dev.bin of=${output} conv=notrunc bs=1 seek=${rw_b_offset}
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# A:Dev B:Normal
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output=${base}-DN.fd
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cp ${input} ${output}
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dd if=dev.bin of=${output} conv=notrunc bs=1 seek=${rw_a_offset}
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dd if=nor.bin of=${output} conv=notrunc bs=1 seek=${rw_b_offset}
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# A:Normal B:Bad
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output=${base}-NB.fd
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cp ${input} ${output}
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dd if=nor.bin of=${output} conv=notrunc bs=1 seek=${rw_a_offset}
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dd if=bad.bin of=${output} conv=notrunc bs=1 seek=${rw_b_offset}
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# A:Bad B:Normal
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output=${base}-BN.fd
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cp ${input} ${output}
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dd if=bad.bin of=${output} conv=notrunc bs=1 seek=${rw_a_offset}
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dd if=nor.bin of=${output} conv=notrunc bs=1 seek=${rw_b_offset}
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# A:Dev B:Bad
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output=${base}-DB.fd
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cp ${input} ${output}
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dd if=dev.bin of=${output} conv=notrunc bs=1 seek=${rw_a_offset}
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dd if=bad.bin of=${output} conv=notrunc bs=1 seek=${rw_b_offset}
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# A:Bad B:Dev
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output=${base}-BD.fd
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cp ${input} ${output}
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dd if=bad.bin of=${output} conv=notrunc bs=1 seek=${rw_a_offset}
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dd if=dev.bin of=${output} conv=notrunc bs=1 seek=${rw_b_offset}
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