docs(contribution-guidelines): updated the build configuration section

Added a couple of sub-sections (Coverity Scan and Test Configuration)
under "Add build configuration" to update the patch owners on the
sections they need to be aware of while introducing new source files.

Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Change-Id: I84adb182f9633863aac864df43578249c2269c1e

docs/process/contributing.rst

@@ -1,8 +1,8 @@
 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`_.
@@ -24,7 +24,7 @@ Getting Started
    branch.
 
 Making Changes
---------------
+==============
 
 -  Ensure commits adhere to the the project's :ref:`Commit Style`.
 
@@ -91,7 +91,7 @@ Making Changes
    block a patch, depending on how critical they are.
 
 Submitting Changes
-------------------
+==================
 
 -  Submit your changes for review at https://review.trustedfirmware.org
    targeting the ``integration`` branch.
@@ -164,13 +164,17 @@ Submitting Changes
       revert your patches and ask you to resubmit a reworked version of them or
       they may ask you to provide a fix-up patch.
 
-Add Build Configurations
-------------------------
+Add CI Configurations
+=====================
 
 -  TF-A uses Jenkins tool for Continuous Integration and testing activities.
    Various CI Jobs are deployed which run tests on every patch before being
    merged. So each of your patches go through a series of checks before they
-   get merged on to the master branch.
+   get merged on to the master branch. Kindly ensure, that everytime you add
+   new files under your platform, they are covered under the following two sections:
+
+Coverity Scan
+-------------
 
 -  ``Coverity Scan analysis`` is one of the tests we perform on our source code
    at regular intervals. We maintain a build script ``tf-cov-make`` which contains the
@@ -182,7 +186,7 @@ Add Build Configurations
    respective build configurations in the ``tf-cov-make`` build script.
 
 -  In this section you find the details on how to append your new build
-   configurations for Coverity Scan analysis:
+   configurations for Coverity scan analysis illustrated with examples:
 
 #. We maintain a separate repository named `tf-a-ci-scripts repository`_
    for placing all the test scripts which will be executed by the CI Jobs.
@@ -223,8 +227,51 @@ Add Build Configurations
    of various other platforms listed in the ``tf-cov-make`` script. Kindly refer
    them and append your build configurations respectively.
 
+Test Build Configuration (``tf-l1-build-plat``)
+-----------------------------------------------
+
+-  Coverity Scan analysis, runs on a daily basis and will not be triggered for
+   every individual trusted-firmware patch.
+
+-  Considering this, we have other distinguished CI jobs which run a set of test
+   configurations on every patch, before they are being passed to ``Coverity scan analysis``.
+
+-  ``tf-l1-build-plat`` is the test group, which holds the test configurations
+   to build all the platforms. So be kind enough to verify that your newly added
+   files are built as part of one of the existing platform configurations present
+   in ``tf-l1-build-plat`` test group.
+
+-  In this section you find the details on how to add the appropriate files,
+   needed to build your newly introduced platform as part of ``tf-l1-build-plat``
+   test group, illustrated with an example:
+
+-  Lets consider ``Hikey`` platform:
+   In the `tf-a-ci-scripts repository`_ we need to add a build configuration file ``hikey-default``
+   under tf_config folder, ``tf_config/hikey-default`` listing all the build parameters
+   relevant to it.
+
+.. code:: shell
+
+   #Hikey Build Parameters
+   CROSS_COMPILE=aarch64-none-elf-
+   PLAT=hikey
+
+-  Further a test-configuration file ``hikey-default:nil`` need to be added under the
+   test group, ``tf-l1-build-plat`` located at ``tf-a-ci-scripts/group/tf-l1-build-plat``,
+   to allow the platform to be built as part of this group.
+
+.. code:: shell
+
+   #
+   # Copyright (c) 2019-2022 Arm Limited. All rights reserved.
+   #
+   # SPDX-License-Identifier: BSD-3-Clause
+   #
+
+-  As illustrated above, you need to add the similar files supporting your platform.
+
 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
@@ -242,7 +289,7 @@ Binary Components
 
 --------------
 
-*Copyright (c) 2013-2021, Arm Limited and Contributors. All rights reserved.*
+*Copyright (c) 2013-2022, Arm Limited and Contributors. All rights reserved.*
 
 .. _developer.trustedfirmware.org: https://developer.trustedfirmware.org
 .. _review.trustedfirmware.org: https://review.trustedfirmware.org