blob: c498c994bceacf8b2cee090582fbc515b27d941a [file] [log] [blame]
# Copyright (c) 2014 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.
"""Driver for power_state for stumpy boards.
import alex_power
class stumpyPower(alex_power.alexPower):
def _power_off(self):
# In test images in the lab, the 'autoreboot' upstart job will
# commonly configure the unit so that it reboots after cold
# reset. Since we mustn't rely on the OS, we can't know for
# sure whether the unit will be on or off after cold reset.
# Fortunately, the autoreboot setting only applies through one
# reset. So, after one reset, the unit may be on or off, but
# autoreboot is disabled. We can be sure to be off after a
# second cold reset so long as it happens before the unit has a
# chance to boot the OS and run the autoreboot job.