Contributing to ARM Trusted Firmware
Before you start contributing to this project you must sign the ARM
Contributor License Agreement (CLA).
Individuals who want to contribute their own work must sign and return an
Individual CLA. Companies that want to contribute must sign and return a
Corporate CLA if their employees' intellectual property has been assigned to
the employer. Copies of the CLAs are available on request from
[firstname.lastname@example.org]. They will be available from http://www.arm.com in
For this project, ARM also requires the GitHub account name(s) associated with
each individual contributor or the designated employees of corporate
contributors. Only contributions originating from these accounts will be
considered covered by the CLA. To avoid delay, you should provide the Github
account name(s) at the same time as the signed CLA.
ARM reserves the right to not accept a contribution. This may be for technical,
commercial or legal reasons.
* Make sure you have a [GitHub account].
* Create an [issue] for your work if one does not already exist. This gives
everyone visibility of whether others are working on something similar. ARM
licensees may contact ARM directly via their partner managers instead if
* For bugs, use the "bug" label in the [issue] and clearly describe the
problem, including steps to reproduce.
* For enhancements, use the "enhancement" label and clearly describe
how you intend to implement the change.
If you intend to include Third Party IP in your contribution, please
raise a separate [issue] for this and ensure that the changes that
include Third Party IP are made on a separate topic branch.
* [Fork] [arm-trusted-firmware] on GitHub.
* Clone the fork to your own machine.
* Create a local topic branch based on the [arm-trusted-firmware] `master`
* Make commits of logical units. See these general [Git guidelines] for
contributing to a project.
* Follow the [Linux coding style]; this style is re-used for the ARM Trusted
* Keep the commits on topic. If you need to fix another bug or make another
enhancement, please create a separate [issue] and address it on a separate
* 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
a GitHub [issue], include a reference (e.g. "fixes #45"); this ensures
the [issue] is [automatically closed] when merged into the
[arm-trusted-firmware] `master` branch.
* Where appropriate, please update the documentation.
* Consider whether the [User Guide] or [Porting Guide] need updating.
* Changes that have a material impact on behavior or programming
interfaces should have an entry at the end of the "[Detailed changes
since last release]" section of the [Change Log]. Minor changes (e.g.
basic refactoring or typo fixes) do not need an entry.
* If this is your first contribution, you may add your name or your
company name to the [Acknowledgements] 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.
* Please test your changes. As a minimum, ensure UEFI boots to the shell on
the Foundation FVP. See the "[Running the software]" section of the
[User Guide] for more information.
* Ensure we have your signed CLA.
* Push your local changes to your fork of the repository.
* Submit a [pull request] to arm-trusted-firmware.
* The changes in the pull request will then undergo further review and
testing. Any review comments will be made as comments on the [pull
request]. This may require you to do some rework.
* When the changes are accepted, ARM will integrate them.
* To ensure a linear commit history, ARM will typically rebase the commits
locally before merging to the [arm-trusted-firmware] `master` branch. In
this case, the [pull request] will be closed rather than directly merged
on GitHub. If the rebase is not trivial, you may be asked to rebase the
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_Copyright (c) 2013, ARM Limited and Contributors. All rights reserved._
[Change Log]: ./docs/change-log.md
[Detailed changes since last release]: ./docs/change-log.md#detailed-changes-since-last-release
[User Guide]: ./docs/user-guide.md
[Running the software]: ./docs/user-guide.md#running-the-software
[Porting Guide]: ./docs/porting-guide.md
[Acknowledgements]: ./acknowledgements.md "Contributor acknowledgements"
[GitHub account]: http://github.com/signup/free
[pull request]: http://help.github.com/articles/using-pull-requests
[automatically closed]: https://help.github.com/articles/closing-issues-via-commit-messages
[Git guidelines]: http://git-scm.com/book/ch5-2.html
[Linux coding style]: https://www.kernel.org/doc/Documentation/CodingStyle