.. _aosp:

####
AOSP
####
This page contains information that tells how to get OP-TEE up and running on
HiKey devices (see :ref:`hikey`, :ref:`hikey960`) together with AOSP. The build
is based on the latest OP-TEE release and updated every quarter together with
the regular OP-TEE releases.

.. note::

    We **only** use and support this static/stable configuration. If you try
    using it with the latest available AOSP, there is a risk that both OP-TEE
    and other parts are not working as expected.

Prerequisites
*************

	- You should already be able to build AOSP for Hikey according to the
          `official instructions`_. Note that the official build is **NOT** part
          of the OP-TEE build. It is a separate and non-related build used only
          to verify and make sure that your system has everything needed to
          build AOSP without any issues.

        - Distro should have necessary packages installed, and the repo tool
          should be installed. Note that AOSP is built with Java. Also make sure
          that the ``mtools`` package is installed, which is needed to make the
          hikey boot image.

	- In addition, you will need the pre-requisites necessary to build
	  optee-os.

After following the AOSP setup instructions, the following additional packages
from main :ref:`prerequisites` page are needed. Please install them.

Build instructions
******************

.. code-block:: bash

    $ git clone https://github.com/linaro-swg/optee_android_manifest [-b <release_tag>]
    # release tags come in the form of X.Y.Z, e.g. 3.8.0
    $ cd optee_android_manifest


HiKey620 - LeMaker 8GB
    .. code-block:: bash

        $ ./sync-p.sh
        $ ./build-p.sh

HiKey620 - CircuitCo 4GB
    .. code-block:: bash

        $ ./sync-p.sh
        $ ./build-p.sh -4g

HiKey960
    .. code-block:: bash

        $ ./sync-p-hikey960.sh
        $ ./build-p-hikey960.sh

These steps **MUST** finish with **no errors**. For ``sync*.sh`` scripts, that
means there must be no errors prior to the ``Sync done!`` console output. For
``build*.sh`` scripts, that means there must be a ``#### build completed
successfully (MM:SS (mm:ss)) ####`` console output! If there are errors, then
there is no point in trying to flash the device.

.. warning::

    - ``--force-sync`` is used which means you might **lose your work** so save
      often, save frequent, and save accordingly, especially before running
      ``sync-p.sh`` again!

    - **Attention!** Do **NOT** use ``git clean`` with ``-x`` or ``-X`` or
      ``-e`` option in ``optee_android_manifest/``, else risk **losing all
      files** in the directory!!!

.. hint::

    You can add the ``-squashfs`` option to ``build.sh`` option to make
    ``system.img`` size smaller, but this will make ``/system`` read-only, so
    you won't be able to push files to it.

Currently, only version P is supported. Other existing files are for internal
development purposes ONLY and **NOT SUPPORTED**!

Flashing the image
******************
The instructions for flashing the image can be found in detail under
``device/linaro/hikey/installer/hikey{960}/README`` in the tree.

    1. Set jumpers/switches ``1-2`` and ``3-4``, and unset ``5-6``.
    2. Reset the board. After that, invoke:

HiKey620
    .. code-block:: bash

        $ cp -a out/target/product/hikey/*.img device/linaro/hikey/installer/hikey/
        $ sudo ./device/linaro/hikey/installer/hikey/flash-all.sh /dev/ttyUSBn

HiKey960
    .. code-block:: bash

        $ cp -a out/target/product/hikey960/*.img device/linaro/hikey/installer/hikey960/
        $ sudo ./device/linaro/hikey/installer/hikey960/flash-all.sh /dev/ttyUSBn

where the ``/dev/ttyUSBn`` device is the one that appears after rebooting with
the 3-4 jumper set. Note that the device only remains in this recovery mode for
about 90 seconds. If you take too long to run the flash commands, it will need
to be reset again. After flashing, unset the 3-4 jumper again to boot normally.

Partial flashing
****************
The last handful of lines in the ``flash-all.sh`` script flash various images.
After modifying and rebuilding Android, it is only necessary to flash `boot`,
`system`, `cache`, `vendor` and `userdata`. If you aren't modifying the kernel,
`boot` is not necessary, either.

Experimental prebuilts
**********************
Available at http://snapshots.linaro.org/android under ``android-hikey*``
directories. Note that these images do not always work and are **NOT
SUPPORTED** as well!

Running xtest
*************
Do NOT try to run ``tee-supplicant`` as it has already been started
automatically as a service! Once booted to the command prompt, ``xtest`` can be
run immediately from the console or an ``adb`` shell. For more details about
running OP-TEE, please see :ref:`optee_test_run_xtest` at :ref:`optee_test`.

Running VTS Gtest unit for Gatekeeper and Keymaster (Optional)
**************************************************************
On the device after going into the command prompt, run:

.. code-block:: bash

    $ su
    $ ./data/nativetest64/VtsHalGatekeeperV1_0TargetTest/VtsHalGatekeeperV1_0TargetTest
    $ ./data/nativetest64/VtsHalKeymasterV3_0TargetTest/VtsHalKeymasterV3_0TargetTest

.. note::

    These tests need to be run as root.

Enable adb over USB
*******************

Boot the device. On serial console:

.. code-block:: bash

    $ su setprop sys.usb.configfs 1
    $ stop adbd
    $ start adbd

Known issues
************
        - If you don't have a monitor or hdmi emulator (dummy plug) connected to
          the board, you'll see constant errors scrolling on the console. As a
          workaround, move ``android.hardware.graphics.composer@2.1-service.rc``
          out of ``/vendor/etc/init``. Move it back in when working with a
          monitor again.

        - Adb over USB currently doesn't work on HiKey960. As a workaround, use
          adb over tcpip. See https://bugs.96boards.org/show_bug.cgi?id=502 for
          details on how to connect. There are still some limitations however.
          E.g. running ``adb shell`` or a second ``adb`` instance will break the
          current adb tcpip connection. This might be due to unstable WiFi
          (there are periodic error messages like ``wlcore: WARNING corrupted
          packet in RX: status: 0x1 len: 76``) or just incompleteness of the
          generic HiKey960 builds under P.

.. _official instructions: https://source.android.com/source/devices.html