Running detachable base fw tests

FAFT is currently not supported for detachable base tests because it does not support two ECs on the same device. Tracking bug. Because of this, the firmware tests for detachable bases were written as scripts that need to be manually run on the DUT. Setting up and running the tests takes approximately 1-2 hours and keyboard EC firmware updates are fairly infrequent (once a year on average pre-FSI, and ~once post-FSI).

Prepare Host and DUT

Tests already come installed in the DUT ChromeOS test image at /usr/local/bin/hammertests. Before you start, ensure that the test folder exists in the test image.

A list of current devices with detachable base mappings is as follows:

DeviceDetachable keyboard

On Host

  1. Create a chroot from ToT checkout.

  2. Obtain the images that will be used in the tests. Obtain the base ec image from GoldenEye/ BCS/ APFE. [Usually the dev will have supplied the image in the testing request bug or indicated where to download it from, because these tests are typically run before RO is locked in the firmware branch].

  3. Select build # you want to test.

  4. Select board name.

  5. Download the firmware_from_source.tar file and unzip via mkdir -p firmware_from_source && tar xvf firmware_from_source.tar -C firmware_from_source.

  6. Export a variable BASE_KB_BOARD to specify the base keyboard board you want to run during the test. For example, export BASE_KB_BOARD=hammer.

  7. Copy the firmware_from_source/${BASE_KB_BOARD}/ec.bin into the chroot created in step 1. You can rename this file if you wish to indicate that it’s base firmware, e.g., ${BASE_KB_BOARD}_ec.bin.

  8. Flash the keyboard EC with the image obtained in step 2, following the steps in this document

  9. Generate the images needed for tests, from the base ec image obtained in step 5 following the steps below:

    a. Inside chroot: Run the shell script that generates the necessary images, supplying ec.bin as the first argument for the BOARD name (where board is the name of the detachable base) and the IMAGE name as the second argument:

    ~/chromiumos/src/third_party/autotest/files/server/cros/faft/ "${BASE_KB_BOARD}" "${BASE_KB_BOARD}_ec.bin"

    The above script needs to run inside chroot of the DUT host

    For devices without fingerprint sensor, if you see error message like Unable to open /mnt/host/source/src/third_party/autotest/files/server/cros/faft/fingerprint_dev_keys/${BASE_KB_BOARD}/dev_key.pem, please create a placeholder for that folder and file, a symlink from any existing key to the missing path manually is ok.

    Ensure that the ec.bin image used above is the same image running on the base ec of the DUT. If they are different, RW verification will fail during testing.

    You should then see the following 17 images created:

    1. EC_RW.bin
    2. ${BASE_KB_BOARD}_corrupt_first_byte.bin
    3. ${BASE_KB_BOARD}.dev.hex
    4. ${BASE_KB_BOARD}.dev.rb9
    5. key.vbprik2
    6. ${BASE_KB_BOARD}_corrupt_first_byte.bin.hex
    7. ${BASE_KB_BOARD}.dev.rb0
    8. ${BASE_KB_BOARD}.dev.rb9.hex
    9. key.vbpubk2
    10. ${BASE_KB_BOARD}_corrupt_last_byte.bin
    11. ${BASE_KB_BOARD}.dev.rb0.hex
    12. ${BASE_KB_BOARD}.bin
    13. ${BASE_KB_BOARD}_corrupt_last_byte.bin.hex
    14. ${BASE_KB_BOARD}.dev.rb1
    15. ${BASE_KB_BOARD}.bin.hex
    16. ${BASE_KB_BOARD}.dev
    17. ${BASE_KB_BOARD}.dev.rb1.hex

    There is one image file that must be manually included in the images folder. For first-time firmware qualification e.g. of a new keyboard, include a copy of the firmware and name it ${BASE_KB_BOARD}_older.bin. For revised firmware qualifications i.e. qualifying new version of RO/RW but not the first RO/RW, include an image of the older firmware and also name it ${BASE_KB_BOARD}_older.bin. The image ${BASE_KB_BOARD}_older.bin is used to test that RW updates can happen with the new firmware. In the case of first time firmware, the tests still check that RW region is updatable even though the older image is the same as the newer image.

    b. Copy the new images folder in your chroot into the DUT from the host via ssh (ensure ssh test keys are added to the shell window first):

    scp -r images root@dut.ip.address:/usr/local/bin/hammertests


Flash the DUT with a test ChromeOS image. The test image already has the base tests in the folder /usr/local/bin/hammertests, You should see the following tests.


You should also see the following control files


Test Execution

To run the tests, simply run each of the control files in the DUT from the /usr/local/bin/hammertests directory. You can do this directly on the DUT or ssh via the host. E.g.


Each control file runs a number of tests, and creates log folders corresponding to each of the tests outlined above. Some tests have several iterations.

Control fileTests executed

Image that should be flashed on DUT for $BASE_NAME_ec.bin (locked). This locked image should be supplied by the dev who requests the testing and attached in the testing request bug.

Control fileTests executed

Image that should be flashed on DUT for ${BASE_KB_BOARD}.dev.rb1 (rollback version = 1).

Control fileTests executed

Image that should be flashed on DUT for $BASE_NAME_ec.bin (unlocked). This unlocked image should be supplied by the dev who requests the testing and attached in the testing request bug.

After running all the tests, attach the log files to the request bug.

Manual Tests

RO cannot update RW with dev signed image:

  • Flash the image ${BASE_KB_BOARD}.dev generated by ./ and verify on the ec console that RW update fails due to failed signature verification.


  • Run command evtest on DUT and check that each key works.

  • (Vivaldi keyboard only) Check that function key works in Chrome. Use a web page like keyboard event viewer to verify that Chrome can detect F1~F10 by pressing search + top row keys.

Keyboard backlight works

  • Can control backlight using:

    echo $VALUE > /sys/class/leds/hammer::kbd_backlight/brightness
  • Or via powerd:

    backlight_dbus_tool --increase_keyboard

Keyboard backlight not advertised on SKUs where backlight not available

Implemented here:

TODO(drinkcat): give system path to keyboard backlight to distinguish devices that have backlight support from those that don't


Touchpad works


  • Base running RW version b under test with touchpad FW v2


  • Manual testing

  • Check that touchpad works

  • 1 to 5 finger swipes

  • Click using touchpad works

I2C passthrough interface does not work

(to be active only when WP is off, for Elan usage)

  • WP on, cannot update the touchpad FW over I2C

    ec_touchpad_updater -f FW_IMAGE
  • WP off (through servo or physically remove the screw), can update the touchpad FW over I2C:

    ec_touchpad_updater -f FW_IMAGE

Touchpad dimensions are correct

No errors of this kind in EC console:

[1.430530 reset rv 0 buf=0000]
[1.432640 max=3206/1832 width=124/124 adj=0 dpi=800/800]
*[1.432948 *** TP mismatch!]*
[1.433585 elan_tp_init:0]

See for example.

We only really need to test for version update when we release new TP firmware