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1# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5import logging
6
7from autotest_lib.server.cros import vboot_constants as vboot
8from autotest_lib.server.cros.faft.firmware_test import FirmwareTest
9
10
11class firmware_RollbackFirmware(FirmwareTest):
12    """
13    Servo based firmware rollback test.
14
15    This test requires a USB disk plugged-in, which contains a ChromeOS test
16    image (built by "build_image --test"). On runtime, this test rollbacks
17    firmware A and results firmware B boot. It then rollbacks firmware B and
18    results recovery boot.
19    """
20    version = 1
21    NEEDS_SERVO_USB = True
22
23    def initialize(self, host, cmdline_args, dev_mode=False):
24        """Initialize the test"""
25        super(firmware_RollbackFirmware, self).initialize(host, cmdline_args)
26        self.backup_firmware()
27        self.switcher.setup_mode('dev' if dev_mode else 'normal')
28        self.setup_usbkey(usbkey=True, host=False)
29
30    def cleanup(self):
31        """Cleanup the test"""
32        try:
33            if self.is_firmware_saved():
34                self.restore_firmware()
35        except  Exception as e:
36            logging.error("Caught exception: %s", str(e))
37        super(firmware_RollbackFirmware, self).cleanup()
38
39    def run_once(self, dev_mode=False):
40        """Runs a single iteration of the test."""
41        logging.info("Rollback firmware A.")
42        self.check_state((self.checkers.fw_tries_checker, 'A'))
43        version_a = self.faft_client.bios.get_version('a')
44        logging.info("Change A version from %d to %d.", version_a,
45                     version_a - 1)
46        self.faft_client.bios.set_version('a', version_a - 1)
47        self.switcher.mode_aware_reboot()
48
49        logging.info("Expected firmware B boot and rollback firmware B.")
50        self.check_state((self.checkers.fw_tries_checker, ('B', False)))
51        version_b = self.faft_client.bios.get_version('b')
52        logging.info("Change B version from %d to %d.", version_b,
53                     version_b - 1)
54        self.faft_client.bios.set_version('b', version_b - 1)
55
56        # Older devices (without BROKEN screen) didn't wait for removal in
57        # dev mode. Make sure the USB key is not plugged in so they won't
58        # start booting immediately and get interrupted by unplug/replug.
59        self.servo.switch_usbkey('host')
60        self.switcher.simple_reboot()
61        self.switcher.bypass_rec_mode()
62        self.switcher.wait_for_client()
63
64        logging.info("Expected recovery boot and restores firmware A and B.")
65        self.check_state((self.checkers.crossystem_checker, {
66                           'mainfw_type': 'recovery',
67                           'recovery_reason': (
68                                vboot.RECOVERY_REASON['RO_INVALID_RW'],
69                                vboot.RECOVERY_REASON['RW_FW_ROLLBACK']),
70                           }))
71        logging.info("Restore version of firmware A/B to %d/%d.", version_a,
72                     version_b)
73        self.faft_client.bios.set_version('a', version_a)
74        self.faft_client.bios.set_version('b', version_b)
75        self.switcher.mode_aware_reboot()
76
77        expected_slot = 'B' if self.fw_vboot2 else 'A'
78        logging.info("Expected firmware %s boot, done.", expected_slot)
79        self.check_state((self.checkers.fw_tries_checker, expected_slot))
80