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Contributing to SCP-firmware
============================
Getting Started
---------------
- Make sure you have a [GitHub account](https://github.com/signup/free).
- [Fork](https://help.github.com/articles/fork-a-repo)
[SCP-firmware](https://github.com/ARM-software/SCP-firmware) on Github.
- Clone the fork to your own machine.
- Create a local topic branch based on the
[SCP-firmware](https://github.com/ARM-software/SCP-firmware) `master` branch.
Making Changes
--------------
- Make commits of logical units. See these general
[Git guidelines](http://git-scm.com/book/ch5-2.html) for contributing to a
project.
- Follow the project [coding style](./doc/code_style.md) and
[coding rules](./doc/code_rules.md).
- 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.
- Where appropriate, please update the documentation.
- 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 [license.md](./license.md)
- Files that contain changes to imported Third Party IP files should retain
their original copyright and license notices.
- If you are submitting new files that you intend to be the technical
sub-maintainer for (for example, a new platform port), then also update the
[maintainers](./maintainers.md) file.
- For topics with multiple commits, it is recommended that you make all the
documentation changes (and nothing else) in the last commit of the series.
- Please test your changes. As a minimum, ensure you can do an AP boot.
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
[Developer Certificate of Origin (DCO)](./dco.txt).
- Push your local changes to your fork of the repository.
- Submit a [pull request](https://help.github.com/articles/using-pull-requests)
to the [SCP-firmware](https://github.com/ARM-software/SCP-firmware) `master`
branch.
- The changes in the
[pull request](https://help.github.com/articles/using-pull-requests) will
then undergo further review and testing by the
[maintainers](./maintainers.md). Any review comments will be made as
comments on the [pull request](https://help.github.com/articles/using-pull-requests).
This may require you to do some rework.
- When the changes are accepted, the [maintainers](./maintainers.md) will
integrate them.
- Typically, the [maintainers](./maintainers.md) will merge the
[pull request](https://help.github.com/articles/using-pull-requests) into
the 'master' branch within the Github UI by rebasing and then merging.
- Please avoid creating merge commits in the
[pull request](https://help.github.com/articles/using-pull-requests)
itself.
- If the [pull request](https://help.github.com/articles/using-pull-requests)
is not based on a recent commit, the [maintainers](./maintainers.md) may
rebase it onto the `master` branch first, or ask you to do this.
- If the [pull request](https://help.github.com/articles/using-pull-requests)
cannot be automatically merged, the [maintainers](./maintainers.md) will
ask you to rebase it onto the `master` branch.
- If after merging the [maintainers](./maintainers.md) find any issues, they
may remove the commits and ask you to create a new pull request to resolve
the problem.
- Please do not delete your topic branch until it is safely merged into
the `master` branch.
Followthrough
-------------
- From time to time new features may be added and older features/functionality
may deprecated. Code owners would be required to modify their code to support
such new requirements within a reasonable time. Failure to do so may result
in the code being deprecated and no longer maintained as a part of the master
branch.
- Any regressions must be fixed as soon as possible. If you are unwilling or
unable to fix the regression, (and nobody else does it for you), your commit
might be removed.
- The author of the commit is responsible for fixing any bugs in a timely
manner. Failure to address issues/bugs may result in the causal commit
being removed.
--------------
*Copyright (c) 2018-2021, Arm Limited and Contributors. All rights reserved.*
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