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Contributor's Guide
===================
Getting Started
---------------
- Make sure you have a Github account and you are logged on both
`developer.trustedfirmware.org`_ and `review.trustedfirmware.org`_.
- If you plan to contribute a major piece of work, it is usually a good idea to
start a discussion around it on the mailing list. This gives everyone
visibility of what is coming up, you might learn that somebody else is
already working on something similar or the community might be able to
provide some early input to help shaping the design of the feature.
If you intend to include Third Party IP in your contribution, please mention
it explicitly in the email thread and ensure that the changes that include
Third Party IP are made in a separate patch (or patch series).
- Clone `Trusted Firmware-A`_ on your own machine as described in
:ref:`prerequisites_get_source`.
- Create a local topic branch based on the `Trusted Firmware-A`_ ``master``
branch.
Making Changes
--------------
- Make commits of logical units. See these general `Git guidelines`_ for
contributing to a project.
- Follow the :ref:`Coding Style` and :ref:`Coding Guidelines`.
- Use the checkpatch.pl script provided with the Linux source tree. A
Makefile target is provided for convenience.
- Keep the commits on topic. If you need to fix another bug or make another
enhancement, please address it on a separate topic branch.
- Avoid long commit series. If you do have a long series, consider whether
some commits should be squashed together or addressed in a separate topic.
- Make sure your commit messages are in the proper format. If a commit fixes
an `issue`_, include a reference.
- Where appropriate, please update the documentation.
- Consider whether the :ref:`Porting Guide`, :ref:`Firmware Design` document
or other in-source documentation needs updating.
- If you are submitting new files that you intend to be the code owner for
(for example, a new platform port), then also update the
:ref:`code owners` file.
- For topics with multiple commits, you should make all documentation changes
(and nothing else) in the last commit of the series. Otherwise, include
the documentation changes within the single commit.
- Ensure that each changed file has the correct copyright and license
information. Files that entirely consist of contributions to this project
should have a copyright notice and BSD-3-Clause SPDX license identifier of
the form as shown in :ref:`license`. Files that contain changes to imported
Third Party IP files should retain their original copyright and license
notices.
For significant contributions you may add your own copyright notice in the
following format:
::
Portions copyright (c) [XXXX-]YYYY, <OWNER>. All rights reserved.
where XXXX is the year of first contribution (if different to YYYY) and YYYY
is the year of most recent contribution. <OWNER> is your name or your company
name.
- Please test your changes. As a minimum, ensure that Linux boots on the
Foundation FVP. See :ref:`Arm Fixed Virtual Platforms (FVP)` for more
information. For more extensive testing, consider running the `TF-A Tests`_
against your patches.
Submitting Changes
------------------
- Ensure that each commit in the series has at least one ``Signed-off-by:``
line, using your real name and email address. The names in the
``Signed-off-by:`` and ``Author:`` lines must match. If anyone else
contributes to the commit, they must also add their own ``Signed-off-by:``
line. By adding this line the contributor certifies the contribution is made
under the terms of the
:download:`Developer Certificate of Origin <../../dco.txt>`.
More details may be found in the `Gerrit Signed-off-by Lines guidelines`_.
- Ensure that each commit also has a unique ``Change-Id:`` line. If you have
cloned the repository with the "`Clone with commit-msg hook`" clone method
(following the :ref:`Prerequisites` document), this should already be the
case.
More details may be found in the `Gerrit Change-Ids documentation`_.
- Submit your changes for review at https://review.trustedfirmware.org
targeting the ``integration`` branch.
- The changes will then undergo further review and testing by the
:ref:`code owners` and :ref:`maintainers`. Any review comments will be
made directly on your patch. This may require you to do some rework. For
controversial changes, the discussion might be moved to the `TF-A mailing
list`_ to involve more of the community.
Refer to the `Gerrit Uploading Changes documentation`_ for more details.
- When the changes are accepted, the :ref:`maintainers` will integrate them.
- Typically, the :ref:`maintainers` will merge the changes into the
``integration`` branch.
- If the changes are not based on a sufficiently-recent commit, or if they
cannot be automatically rebased, then the :ref:`maintainers` may rebase it
on the ``integration`` branch or ask you to do so.
- After final integration testing, the changes will make their way into the
``master`` branch. If a problem is found during integration, the
:ref:`maintainers` will request your help to solve the issue. They may
revert your patches and ask you to resubmit a reworked version of them or
they may ask you to provide a fix-up patch.
Binary Components
-----------------
- Platforms may depend on binary components submitted to the `Trusted Firmware
binary repository`_ if they require code that the contributor is unable or
unwilling to open-source. This should be used as a rare exception.
- All binary components must follow the contribution guidelines (in particular
licensing rules) outlined in the `readme.rst <tf-binaries-readme_>`_ file of
the binary repository.
- Binary components must be restricted to only the specific functionality that
cannot be open-sourced and must be linked into a larger open-source platform
port. The majority of the platform port must still be implemented in open
source. Platform ports that are merely a thin wrapper around a binary
component that contains all the actual code will not be accepted.
- Only platform port code (i.e. in the ``plat/<vendor>`` directory) may rely on
binary components. Generic code must always be fully open-source.
--------------
*Copyright (c) 2013-2020, Arm Limited and Contributors. All rights reserved.*
.. _developer.trustedfirmware.org: https://developer.trustedfirmware.org
.. _review.trustedfirmware.org: https://review.trustedfirmware.org
.. _issue: https://developer.trustedfirmware.org/project/board/1/
.. _Trusted Firmware-A: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git
.. _Git guidelines: http://git-scm.com/book/ch5-2.html
.. _Gerrit Uploading Changes documentation: https://review.trustedfirmware.org/Documentation/user-upload.html
.. _Gerrit Signed-off-by Lines guidelines: https://review.trustedfirmware.org/Documentation/user-signedoffby.html
.. _Gerrit Change-Ids documentation: https://review.trustedfirmware.org/Documentation/user-changeid.html
.. _TF-A Tests: https://trustedfirmware-a-tests.readthedocs.io
.. _Trusted Firmware binary repository: https://review.trustedfirmware.org/admin/repos/tf-binaries
.. _tf-binaries-readme: https://git.trustedfirmware.org/tf-binaries.git/tree/readme.rst
.. _TF-A mailing list: https://lists.trustedfirmware.org/mailman/listinfo/tf-a