/usr/bin/enable_dev_usb_boot is in vboot-utils 0~R63-10032.B-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | #!/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.
alert() {
echo "$*" >&2
}
die() {
alert "ERROR: $*"
exit 1
}
case "$(crossystem fwid 2>/dev/null || true)" in
Mario.* )
die "Sorry, your platform does not support booting from USB."
;;
Alex.* | ZGB.* )
# For these legacy platforms, we need to re-flash firmware to get USB boot.
chromeos-firmwareupdate --mode=todev || die "Failed to enable USB boot."
;;
"" )
die "Sorry, your firmware does not look like ChromeOS firmware."
;;
* )
crossystem dev_boot_usb=1 2>/dev/null || die "Failed to enable USB boot."
echo "
SUCCESS: Booting any self-signed kernel from SSD/USB/SDCard slot is enabled.
Insert bootable media into USB / SDCard slot and press Ctrl-U in developer
screen to boot your self-signed image.
"
;;
esac
|