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#!/bin/sh
#
# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# This script can change GBB flags in system live firmware or a given image
# file.
SCRIPT_BASE="$(dirname "$0")"
. "${SCRIPT_BASE}/gbb_flags_common.sh"
# DEFINE_string name default_value description flag
DEFINE_string file "" "Path to firmware image. Default to system firmware." "f"
DEFINE_boolean check_wp ${FLAGS_TRUE} "Check write protection states first." ""
set -e
# Check write protection
# ----------------------------------------------------------------------------
check_write_protection() {
local hw_wp="" sw_wp=""
if ! crossystem "wpsw_boot?0"; then
hw_wp="on"
fi
# Keep 'local' declaration split from assignment so return code is checked.
local wp_states
wp_states="$(flashrom -p host --wp-status 2>/dev/null | grep WP)"
local wp_disabled="$(echo "${wp_states}" | grep "WP:.*is disabled.")"
local wp_zero_len="$(echo "${wp_states}" | grep "WP:.*, len=0x00000000")"
if [ -z "${wp_disabled}" -a -z "${wp_zero_len}" ]; then
sw_wp="on"
fi
if [ -n "${hw_wp}" -a -n "${sw_wp}" ]; then
return ${FLAGS_FALSE}
fi
return ${FLAGS_TRUE}
}
# Main
# ----------------------------------------------------------------------------
main() {
if [ "$#" != "1" ]; then
flags_help
exit 1
fi
local value="$(($1))"
local image_file="${FLAGS_file}"
if [ -z "${FLAGS_file}" ]; then
image_file="$(make_temp_file)"
flashrom_read "${image_file}"
fi
# Process file
# Keep 'local' declaration split from assignment so return code is checked.
local old_value
old_value="$(futility gbb -g --flags "${image_file}")"
printf "Setting GBB flags from %s to 0x%x.." "${old_value}" "${value}"
futility gbb -s --flags="${value}" "${image_file}"
if [ -z "${FLAGS_file}" ]; then
if [ "${FLAGS_check_wp}" = "${FLAGS_TRUE}" ]; then
if ! check_write_protection; then
echo ""
echo "WARNING: System GBB Flags are NOT changed!!!"
echo "ERROR: You must disable write protection before setting flags."
exit 1
fi
fi
flashrom_write "$image_file"
fi
}
# Parse command line
FLAGS "$@" || exit 1
eval set -- "$FLAGS_ARGV"
main "$@"
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