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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/common_minimal.sh"
load_shflags || exit 1
# 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." ""
# Globals
# ----------------------------------------------------------------------------
set -e
# Values from vboot_reference/firmware/include/gbb_header.h
GBBFLAGS_DESCRIPTION="
Defined flags (some values may be not supported by all systems):
GBB_FLAG_DEV_SCREEN_SHORT_DELAY 0x00000001
GBB_FLAG_LOAD_OPTION_ROMS 0x00000002
GBB_FLAG_ENABLE_ALTERNATE_OS 0x00000004
GBB_FLAG_FORCE_DEV_SWITCH_ON 0x00000008
GBB_FLAG_FORCE_DEV_BOOT_USB 0x00000010
GBB_FLAG_DISABLE_FW_ROLLBACK_CHECK 0x00000020
GBB_FLAG_ENTER_TRIGGERS_TONORM 0x00000040
GBB_FLAG_FORCE_DEV_BOOT_LEGACY 0x00000080
GBB_FLAG_FAFT_KEY_OVERIDE 0x00000100
GBB_FLAG_DISABLE_EC_SOFTWARE_SYNC 0x00000200
GBB_FLAG_DEFAULT_DEV_BOOT_LEGACY 0x00000400
GBB_FLAG_DISABLE_PD_SOFTWARE_SYNC 0x00000800
GBB_FLAG_DISABLE_LID_SHUTDOWN 0x00001000
GBB_FLAG_FORCE_DEV_BOOT_FASTBOOT_FULL_CAP 0x00002000
GBB_FLAG_ENABLE_SERIAL 0x00004000
To get a developer-friendly device, try 0x11 (short_delay + boot_usb).
For factory-related tests (always DEV), try 0x39.
For early development (disable EC/PD software sync), try 0xa39.
"
FLAGS_HELP="Changes ChromeOS Firmware GBB Flags value.
Usage: $0 [option_flags] GBB_FLAGS_VALUE
$GBBFLAGS_DESCRIPTION"
FLASHROM_COMMON_OPT="-p host"
FLASHROM_READ_OPT="$FLASHROM_COMMON_OPT -i GBB -r"
FLASHROM_WRITE_OPT="$FLASHROM_COMMON_OPT -i GBB --fast-verify -w"
# Check write protection
# ----------------------------------------------------------------------------
check_write_protection() {
local hw_wp="" sw_wp=""
if ! crossystem "wpsw_boot?0"; then
hw_wp="on"
fi
local wp_states="$(flashrom $FLASHROM_COMMON_OPT --wp-status 2>/dev/null \
| grep WP)"
local wp_disabled="$(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 $FLASHROM_READ_OPT "$image_file"
fi
# Process file
local old_value="$(futility gbb -g --flags "$image_file")"
printf "Setting GBB flags from %s to 0x%x.." "$old_value" "$value" >&2
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 $FLASHROM_WRITE_OPT "$image_file"
fi
}
# Parse command line
FLAGS "$@" || exit 1
ORIGINAL_PARAMS="$@"
eval set -- "$FLAGS_ARGV"
main "$@"
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