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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"
# 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_FAFT_KEY_OVERIDE 0x00000100
To get a developer-friendly device, try 0x11 (short_delay + boot_usb).
For factory-related tests (always DEV), try 0x39.
"
FLAGS_HELP="Changes ChromeOS Firmware GBB Flags value.
Usage: $0 [option_flags] GBB_FLAGS_VALUE
$GBBFLAGS_DESCRIPTION"
FLASHROM_COMMON_OPT="-p internal:bus=spi"
FLASHROM_READ_OPT="$FLASHROM_COMMON_OPT -i GBB -r"
FLASHROM_WRITE_OPT="$FLASHROM_COMMON_OPT -i GBB --fast-verify -w"
# Main
# ----------------------------------------------------------------------------
main() {
if [ "$#" != "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="$(gbb_utility -g --flags "$image_file")"
printf "Setting GBB flags from %s to 0x%x.." "$old_value" "$value" >&2
gbb_utility -s --flags="$value" "$image_file"
if [ -z "$FLAGS_file" ]; then
flashrom $FLASHROM_WRITE_OPT "$image_file"
fi
}
# Parse command line
FLAGS "$@" || exit 1
ORIGINAL_PARAMS="$@"
eval set -- "$FLAGS_ARGV"
main "$@"
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