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arm-trusted-firmware/contributing.md
Ian Spray 36eaaf3769 Allow style checking of tree and local changes 
New phony Makefile targets have been added:

 * checkcodebase
 * checkpatch

The checkcodebase target will run a Linux style compliance check over the
entire codebase, and honours the V=1 Makefile verbose setting and so will
show more information when this is enabled.

If the local directory is a git checkout then the output of git ls-files is
used to decide which files to test for compliance.  If the local directory
is not under git control then a 'best attempt' is made, but in this case it
should be noted that it is possible for additional non-codebase files to be
tested, so care should be taken when parsing the output.

The checkpatch target will compare local changes against the git origin/master
to allow issues with the last set of changes to be identified.  To override
the change comparision location, set the BASE_COMMIT variable to your
desired git branch.

Both targets rely on the Linux source tree script checkpatch.pl to do the
syntax checking, and expects that the CHECKPATCH environment variable points
to the location of this file.

Notes on the usage of these targets have been added to the contributing.md
and docs/user-guide.md text files.

Change-Id: I6d73c97af578e24a34226d972afadab9d30f1d8d
2014-01-30 17:55:31 +00:00

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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 cla-submissions@arm.com. They will be available from http://www.arm.com in due course.

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.

Getting Started

  • 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 they prefer.
    • Note that the issue tracker for this project is in a separate issue tracking repository. Please follow the guidelines in that repository.
    • 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 branch.

Making Changes

  • Make commits of logical units. See these general Git guidelines for contributing to a project.
  • Follow the Linux coding style; this style is enforced for the ARM Trusted Firmware project (style errors only, not warnings).
    • Use the checkpatch.pl script provided with the Linux source tree. A Makefile target is provided for convenience (see section 2 in the User Guide).
  • 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 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 a GitHub issue, include a reference (e.g. "fixes arm-software/tf-issues#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.

Submitting Changes

  • 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 commits yourself.

Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.