diff --git a/docs/Makefile b/docs/Makefile
new file mode 100644
index 0000000..04e3a70
--- /dev/null
+++ b/docs/Makefile
@@ -0,0 +1,25 @@
+#
+# Copyright (c) 2019-2021, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS    ?=
+SPHINXBUILD   ?= sphinx-build
+SOURCEDIR     = .
+BUILDDIR      = _build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
diff --git a/docs/SphinxBuild.cmake b/docs/SphinxBuild.cmake
new file mode 100644
index 0000000..b364813
--- /dev/null
+++ b/docs/SphinxBuild.cmake
@@ -0,0 +1,18 @@
+#
+# Copyright (c) 2019-2021, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+# Minimal cmake script for running sphinx. Use as:
+# cmake -P SphinxBuild.cmake
+
+# Inputs:
+#   SPHINXOPTS : extra options for sphinx
+
+set(SPHINXBUILD "sphinx-build" CACHE PATH "Location of sphinx-build executable.")
+set(SPHNIX_BUILDDIR "_build" CACHE PATH "Directory to place sphinx outpot to.")
+
+exec_program(${SPHINXBUILD} ./
+             ARGS -M html ${CMAKE_CURRENT_LIST_DIR} ${SPHNIX_BUILDDIR} ${SPHINXOPTS}
+            )
diff --git a/docs/_static/TrustedFirmware-Logo_standard-white.png b/docs/_static/TrustedFirmware-Logo_standard-white.png
new file mode 100644
index 0000000..e7bff71
--- /dev/null
+++ b/docs/_static/TrustedFirmware-Logo_standard-white.png
Binary files differ
diff --git a/docs/_templates/.keep_me b/docs/_templates/.keep_me
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/docs/_templates/.keep_me
diff --git a/docs/components/build_system.rst b/docs/components/build_system.rst
new file mode 100644
index 0000000..4c26b32
--- /dev/null
+++ b/docs/components/build_system.rst
@@ -0,0 +1,22 @@
+Build system
+============
+
+.. cmake-module:: ../../cmake/UnitTest.cmake
+
+.. cmake-module:: ../../cmake/FindLibClang.cmake
+
+Generating documentation
+------------------------
+
+``sphinx-builder`` is used for building the documentation which is required to be installed on the machine. The documentation
+can be built by executing the following commands.
+
+::
+
+  cd docs
+  make html
+
+
+--------------
+
+*Copyright (c) 2019-2021, Arm Limited. All rights reserved.*
diff --git a/docs/components/c_picker.rst b/docs/components/c_picker.rst
new file mode 100644
index 0000000..da89520
--- /dev/null
+++ b/docs/components/c_picker.rst
@@ -0,0 +1,61 @@
+c-picker
+========
+
+c-picker uses ``libclang``'s Python interface for parsing source files.
+
+Command line options
+--------------------
+
+- ``-h, --help`` - Showing help message
+- ``--root ROOT`` - Root source directory
+- ``--config CONFIG`` - Configuration file (``.json|.yml``)
+- ``--output OUTPUT`` - Output file
+- ``--print-dependencies`` - Prints the dependencies
+- ``--version`` - Shows the program's version number and exit
+- ``--args ...``  - clang arguments
+
+
+Configuration file format
+-------------------------
+
+c-picker configuration can be described in ``JSON`` or ``YAML`` format using the same object structure.
+
+- ``elements`` - List of elements to pick from the original code
+
+  - ``name`` - Name of the element
+  - ``type`` - Type of the element: ``include``, ``function``, ``variable``
+  - ``args`` - Arguments for clang used during picking the element
+  - ``options`` - Currenly the only options is ``remove_static`` which removes
+    the ``static`` qualifier from the element's definition.
+
+- ``options`` - Global options for all elements
+- ``args`` - Global clang arguments for all elements
+
+YAML example
+------------
+
+YAML format is preferred because it can contain metadata like comments and licence information.
+
+.. code-block:: YAML
+
+  elements:
+  - file: bl1/bl1_fwu.c
+    type: variable
+    name: bl1_fwu_loaded_ids
+    options: [remove_static]
+  - file: bl1/bl1_fwu.c
+    type: function
+    name: bl1_fwu_add_loaded_id
+    options: [remove_static]
+  - file: bl1/bl1_fwu.c
+    type: function
+    name: bl1_fwu_remove_loaded_id
+    options: [remove_static]
+  args:
+  - -DFWU_MAX_SIMULTANEOUS_IMAGES=10
+  - -DINVALID_IMAGE_ID=0xffffffff
+
+
+--------------
+
+*Copyright (c) 2019-2021, Arm Limited. All rights reserved.*
diff --git a/docs/components/code_coverage.rst b/docs/components/code_coverage.rst
new file mode 100644
index 0000000..3936e4f
--- /dev/null
+++ b/docs/components/code_coverage.rst
@@ -0,0 +1,27 @@
+Code coverage
+=============
+
+Coverage processing flow
+------------------------
+
+1. Prerequisites
+
+   1. Building all or selected test binaries with coverage enabled
+
+   2. Running all or selected test binaries
+
+2. Collecting coverage data from ``.gcda`` and ``.gcno`` file into ``lcov`` coverage info file
+
+3. Mapping c-picker generated files' coverage to the original source lines
+
+4. Filtering coverage data for separating the coverage of the code under tests and the coverage of the test code
+
+5. Generating HTML coverage report from the filtered lcov info files
+
+
+.. cmake-module:: ../../cmake/Coverage.cmake
+
+
+--------------
+
+*Copyright (c) 2019-2021, Arm Limited. All rights reserved.*
diff --git a/docs/components/cppumock.rst b/docs/components/cppumock.rst
new file mode 100644
index 0000000..fd82d95
--- /dev/null
+++ b/docs/components/cppumock.rst
@@ -0,0 +1,197 @@
+CppUMock
+========
+
+CppUMock is the built-in mocking system of CppUTest. This chapter describes the basic features of the system. For details please
+refer the `official CppUMock manual`_.
+
+System functions
+----------------
+
+Checking expectations
+^^^^^^^^^^^^^^^^^^^^^
+
+After defining expected calls an invoking actual call the test should check if all the expected calls have happened. This can be
+done by calling ``mock().checkExpectations()``. The common place to put this function call is the ``TEST_TEARDOWN`` function of
+the test group.
+
+
+Resetting mocking system
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+After the last interaction with the mocking system the developer should reset the state of the system by calling
+``mock().clear()``. The common place to put this function call is the ``TEST_TEARDOWN`` function of the test group after calling
+``mock().checkExpectations()``.
+
+
+Namespaces
+^^^^^^^^^^
+
+All interactions with the mocking system start by calling ``mock()``. This function has an option ``name`` string parameter
+which can be used for limiting the scope of the mocking operation.
+
+.. code-block:: C++
+
+  mock("bl1").expectOneCall("bl1_main");
+
+
+Enable/disable
+^^^^^^^^^^^^^^
+
+The mocking system can be enabled/disabled runtime using the functions below. This causes call expected and actual call to be
+ignored. Default settings are restored by ``mock().clear()``.
+
+- ``enable()``
+- ``disable()``
+
+.. code-block:: C++
+
+  mock().disable();
+  // All CppUMock calls are ignored after this point
+  mock().enable();
+  // CppUMock calls are working again
+
+  mock().disable();
+  // All CppUMock calls are ignored after this point
+  [...]
+
+  mock().clear();
+  // Default settings are restored
+
+
+String order
+^^^^^^^^^^^^
+
+After defining multiple expected function call the mocking system always The mocking system always uses the next matching
+function when an actual call happens but by default it doesn't check if different function calls happen in the order of
+definition. This behaviour can be turned on using the ``mock().strictOrder()`` function. This option is also set to default by
+the ``mock().clear()`` function.
+
+.. code-block:: C++
+
+  mock().expectOneCall("A");
+  mock().expectOneCall("B");
+
+  mock().actualCall("B");
+  mock().actualCall("A");
+  // No error
+
+  mock().strictOrder();
+  mock().expectOneCall("A");
+  mock().expectOneCall("B");
+
+  mock().actualCall("B"); // Error generated here
+  mock().actualCall("A");
+
+
+Ignoring unspecified calls
+^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+If there are addition actual calls happening in the test case which are unrelated to the test case (i.e. log or other messages)
+the unspecified calls can be ignored by adding ``mock().ignoreOtherCalls()`` to the test case. This function should be used
+carefully because it can hide unexpected call which are indicating errors in the code. The affect of this call ends by calling
+``mock().clear()``.
+
+
+Specifying object
+-----------------
+
+In object oriented environment member function should validate if the function call happened on the suitable object. This is
+done by adding the following function to the mock specification.
+
+- ``onObject(objectPtr)``
+
+
+Validating parameters
+---------------------
+
+Each supported parameter type has a corresponding function. These are the same
+in the expected and actual calls.
+
+- ``withBoolParameter(name, bool value)``
+- ``withIntParameter(name, int value)``
+- ``withUnsignedIntParameter(name, unsigned int value)``
+- ``withLongIntParameter(name, long int value)``
+- ``withUnsignedLongIntParameter(name, unsigned long int value)``
+- ``withDoubleParameter(name, double value)``
+- ``withStringParameter(name, const char* value)``
+- ``withPointerParameter(name, void* value)``
+- ``withFunctionPointerParameter(name, void (*value)())``
+- ``withConstPointerParameter(name, const void* value)``
+- ``withMemoryBufferParameter(name, const unsigned char* value, size_t size)``
+
+If custum types are defined and copier/comparator objects were installed the following function can handle these parameters.
+
+- ``withParameterOfType(typeName, name, value)``
+
+There's an option to copying data from the test environment into the mock function. When setting expectations the following
+function can be used to set the pointer and the address of the data. **The mocking system will not create a copy of this data**
+so the original data should be kept intact until the actual call happens.
+
+- ``withOutputParameterReturning(name, value, size)``
+- ``withOutputParameterOfTypeReturning(typeName, name, value)``
+
+In the actual call the pair of these function are shown below.
+
+- ``withOutputParameter(name, output)``
+- ``withOutputParameterOfType(typeName, name, output)``
+
+
+Ignoring parameters
+^^^^^^^^^^^^^^^^^^^
+
+There are cases when the developer doesn't want to specify all parameters. The following function can set this behaviour in the
+expected call.
+
+- ``ignoreOtherParameters()``
+
+
+Specifying return values
+------------------------
+
+Using function name overloading the return values are specified by calling ``andReturnValue`` and the parameter type will
+determine the exact function.
+
+- ``andReturnValue(bool value)``
+- ``andReturnValue(int value)``
+- ``andReturnValue(unsigned int value)``
+- ``andReturnValue(long int value)``
+- ``andReturnValue(unsigned long int value)``
+- ``andReturnValue(double value)``
+- ``andReturnValue(const char* value)``
+- ``andReturnValue(void* value)``
+- ``andReturnValue(const void* value)``
+- ``andReturnValue(void (*value)())``
+
+
+Returning value in actual calls
+-------------------------------
+
+All of these function have version with ``OrDefault(type default_value)`` suffix. These version return a default value if the
+return value was not specified in the expected call.
+
+- ``bool returnBoolValue()``
+- ``int returnIntValue()``
+- ``unsigned int returnUnsignedIntValue()``
+- ``long int returnLongIntValue()``
+- ``unsigned long int returnUnsignedLongIntValue()``
+- ``double returnDoubleValue()``
+- ``const char * returnStringValue()``
+- ``void * returnPointerValue()``
+- ``const void * returnConstPointerValue()``
+- ``void (*returnFunctionPointerValue())()``
+
+
+Debugging CppUMock errors
+-------------------------
+
+Debugging CppUMock errors can be hard unlike assertion errors because a mocking failure can happen multiple layers of function
+calls under the test case. The mocking system has a very similar feature to CppUTest's ``UT_CRASH()`` which is
+``mock().crashOnFailure()``. By enabling this feature the code will crash on mocking errors and the developer could easily catch
+it with the debugger.
+
+
+--------------
+
+*Copyright (c) 2019-2021, Arm Limited. All rights reserved.*
+
+.. _`official CppUMock manual`: https://cpputest.github.io/mocking_manual.html
diff --git a/docs/components/cpputest.rst b/docs/components/cpputest.rst
new file mode 100644
index 0000000..e1c34a9
--- /dev/null
+++ b/docs/components/cpputest.rst
@@ -0,0 +1,281 @@
+CppUTest
+========
+
+This document is based on CppUTest v3.8. CppUtest is a unit testing framework for testing C and C++ code. This document
+introduces the basic features of the framework. For further information check the `official manual of CppUTest`_.
+
+
+Why CppUTest?
+-------------
+
+First of all it was not our goal to develop a new unit testing framework while plenty of open source solutions are already
+available. There were no special requirements agains the unit testing framework that would rule out all existing frameworks so
+we only had to choose a suitable one for our current and possible future needs.
+
+We ended up selecting CppUTest because of its small footprint and easy portability. It also goes along with the standard xUnit
+frameworks' principles and provides a standard interface to the outside world. Some details are listed below.
+
+- C/C++ support
+- Small footprint (compared to Google Test)
+- Easy to use on embedded systems
+- Built-in mocking system (CppUMock)
+- Implements four-phase testing pattern (setup, exercise, verify, teardown)
+- Selective run of test cases
+- Standard output format (JUnit, TeamCity)
+
+
+Assertions
+----------
+
+Generally is a good practice to use more specific assertions because it can output more informative error messages in case of a
+failure. The generic form or assertions is ``assert(expected, actual)``. Each assert type has a _TEXT variant for user defined
+error messages as last parameter.
+
+- Boolean
+
+  - ``CHECK(condition)`` - Same as ``CHECK_TRUE``
+  - ``CHECK_TRUE(condition)``
+  - ``CHECK_FALSE(condition)``
+
+- C string
+
+  - ``STRCMP_EQUAL(expected, actual)``
+  - ``STRNCMP_EQUAL(expected, actual, length)``
+  - ``STRCMP_NOCASE_EQUAL(expected, actual)``
+  - ``STRCMP_CONTAINS(expected, actual)``
+  - ``STRCMP_NOCASE_CONTAINS(expected, actual)``
+
+- Integer
+
+  - ``LONGS_EQUAL(expected, actual)``
+  - ``UNSIGNED_LONGS_EQUAL(expected, actual)``
+  - ``LONGLONGS_EQUAL(expected, actual)``
+  - ``UNSIGNED_LONGLONGS_EQUAL(expected, actual)``
+  - ``BYTES_EQUAL(expected, actual)``
+  - ``SIGNED_BYTES_EQUAL(expected, actual)``
+  - ``POINTERS_EQUAL(expected, actual)``
+  - ``FUNCTIONPOINTERS_EQUAL(expected, actual)``
+
+- Enums
+
+  - ``ENUMS_EQUAL_INT(expected, actual)``
+  - ``ENUMS_EQUAL_TYPE(underlying_type, expected, actual)``
+
+- Other assertions
+
+  - ``CHECK_EQUAL(expected, actual)`` - Requires ``operator=`` and ``StringFrom(type)`` to be implemented
+  - ``CHECK_COMPARE(first, relop, second)`` - Same as ``CHECK_EQUAL`` but with any type of compare
+  - ``DOUBLES_EQUAL(expected, actual, threshold)``
+  - ``MEMCMP_EQUAL(expected, actual, size)``
+  - ``BITS_EQUAL(expected, actual, mask)``
+  - ``FAIL()`` or ``FAIL_TEST()`` - Test case fails if called
+  - ``CHECK_THROWS(expected, expression)`` - Catching C++ exceptions
+
+- Miscellaneous macros
+
+  - ``IGNORE_TEST`` - Same as ``TEST`` but it’s not called
+  - ``TEST_EXIT`` - Exists test
+  - ``UT_CRASH()`` - Crashes the test which is easy to catch with debugger
+  - ``UT_PRINT(text)`` - Generic print function
+
+
+Test runner
+-----------
+
+Test cases are collected automatically. Under the hood the ``TEST`` macros are creating global instances of classes and their
+constructor registers the test cases into the test registry. This happens before entering the ``main`` function. In the ``main``
+function only the ``RUN_ALL_TESTS`` macro needs to be placed with the command line arguments passed to it. On executing the
+binary the command line arguments will control the behaviour of the test process.
+
+.. code-block:: C++
+
+  #include "CppUTest/CommandLineTestRunner.h"
+
+  int main(int argc, char* argv[]) {
+  	return RUN_ALL_TESTS(argc, argv);
+  }
+
+The default ``main`` implementation is added to all unit test suites by the
+build system.
+
+
+Command line options
+--------------------
+
+Command line options are available mainly for configuring the output format of
+the test binary and for filtering test groups or cases.
+
+- Output
+
+  - ``-v`` - Prints each test name before running them
+  - ``-c`` - Colorized output
+  - ``-o{normal, junit, teamcity}`` - Output format, junit can be processed by
+    most CIs
+  - ``-k packageName`` - Package name for junit output
+  - ``-lg`` - List test groups
+  - ``-ln`` - List test cases
+
+- Other
+
+  - ``-p`` - Runs each test case in separate processes
+  - ``-ri`` - Runs ignored test cases
+  - ``-r#`` - Repeats testing ``#`` times
+  - ``-s seed`` - Shuffles tests
+
+- Filtering test cases
+
+  - ``"TEST(groupName, testName)"`` - Running single test
+  - ``"IGNORE_TEST(groupName, testName)"`` -- Running single ignored test
+  - ``-g text`` - Runing groups containing text
+  - ``-n text`` - Runing tests containing text
+  - ``-sg text`` - Runing groups matching text
+  - ``-sn text`` - Runing tests matching text
+  - ``-xg text`` - Excluding groups containing text
+  - ``-xn text`` - Excluding tests containing text
+  - ``-xsg text`` - Excluding groups matching text
+  - ``-xsn text`` - Excluding tests matching text
+
+
+Troubleshooting
+---------------
+
+Output messages
+^^^^^^^^^^^^^^^
+
+When one of tests fails the first step is to run it separately and check its
+output message. Usually it shows the exact line of the file where the error
+happened.
+
+::
+
+  test_memcmp.cpp:17: error: Failure in TEST(memcmp, empty)
+    expected <1 0x1>
+    but was  <0 0x0>
+
+The executed tests can be followed by adding ``-v`` command line option.
+
+::
+
+  ./memcmp -v
+  TEST(memcmp, different) - 0 ms
+  TEST(memcmp, same) - 0 ms
+  TEST(memcmp, empty) - 0 ms
+
+  OK (3 tests, 3 ran, 1 checks, 0 ignored, 0 filtered out, 0 ms)
+
+
+Catching failure with debugger
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+If a failure happens in a helper function or in a loop where the assertion
+is called multiple times it is harder to get the exact environment of a failure.
+In this case it's a good practice to put a ``UT_CRASH()`` call into a
+conditional block which hits when the failure happens. This way the debugger can
+stop on failure because the code emits a signal.
+
+.. code-block:: C++
+
+  TEST(magic, iterate) {
+  	int result;
+
+  	for(int i = 0; i < 1000; i++) {
+  		result = magic_function(i);
+
+  		// Debug code
+  		if (result) {
+  			UT_CRASH();
+  		}
+
+  		LONGS_EQUAL(0, result);
+  	}
+  }
+
+
+Using ``FAIL`` macro
+^^^^^^^^^^^^^^^^^^^^
+
+It's recommended to use ``FAIL`` macro in conditions that should never occur in
+tests. For example if a test case loads test data from an external file but the
+file could not be opened the ``FAIL`` macro should be used with an informative
+message.
+
+.. code-block:: C++
+
+  fd = open("test.bin", O_RDONLY);
+  if (fd < 0) {
+  	FAIL("test.bin open failed");
+  }
+
+
+Interference between test cases
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Test cases can interfere if there's a global resource which was not restored to
+its original state after leaving a test case. This can be hard to find but at
+least the it's easy to make sure that this is root case of an error. Let's
+assume there's a global variable which is set during the test case but it
+original value is not restore at the end. CppUTest has an command line option
+for running each test case in separate process. This makes the global variable
+to have its original value at the beginning of the test cases. Basically if the
+test works by passing argument ``-p`` when running but fails without it, there's
+a good chance for having an interference between test cases.
+
+.. code-block:: C++
+
+  int x = 0;
+
+  TEST_GROUP(crosstalk) {
+  };
+
+  TEST(crosstalk, a) {
+  	LONGS_EQUAL(0, x);
+  	x = 1;
+  }
+
+  TEST(crosstalk, b) {
+  	LONGS_EQUAL(0, x);
+  	x = 1;
+  }
+
+  TEST(crosstalk, c) {
+  	LONGS_EQUAL(0, x);
+  	x = 1;
+  }
+
+By running the test executable with different command line arguments it produces
+a different result.
+
+.. code-block::
+
+  ./crosstalk -v
+
+  TEST(crosstalk, c) - 0 ms
+  TEST(crosstalk, b)
+  test_crosstalk.cpp:37: error:
+  Failure in TEST(crosstalk, b)
+  	expected <0 0x0>
+  	but was  <1 0x1>
+
+   - 0 ms
+  TEST(crosstalk, a)
+  test_crosstalk.cpp:32: error: Failure in TEST(crosstalk, a)
+  	expected <0 0x0>
+  	but was  <1 0x1>
+
+   - 0 ms
+
+  Errors (2 failures, 3 tests, 3 ran, 3 checks, 0 ignored, 0 filtered out, 0 ms)
+
+  ./crosstalk -v -p
+  TEST(crosstalk, c) - 1 ms
+  TEST(crosstalk, b) - 0 ms
+  TEST(crosstalk, a) - 0 ms
+
+  OK (3 tests, 0 ran, 0 checks, 0 ignored, 0 filtered out, 2 ms)
+
+
+--------------
+
+*Copyright (c) 2019-2021, Arm Limited. All rights reserved.*
+
+.. _`official manual of CppUTest`: https://cpputest.github.io/
diff --git a/docs/components/index.rst b/docs/components/index.rst
new file mode 100644
index 0000000..301cf9f
--- /dev/null
+++ b/docs/components/index.rst
@@ -0,0 +1,14 @@
+Component user manuals
+======================
+
+.. toctree::
+	cpputest
+	cppumock
+	c_picker
+	build_system
+	code_coverage
+
+
+--------------
+
+*Copyright (c) 2019-2021, Arm Limited. All rights reserved.*
diff --git a/docs/conf.py b/docs/conf.py
new file mode 100644
index 0000000..283be86
--- /dev/null
+++ b/docs/conf.py
@@ -0,0 +1,109 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (c) 2019-2021, Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#
+# Configuration file for the Sphinx documentation builder.
+#
+# See the options documentation at http://www.sphinx-doc.org/en/master/config
+
+# -- Metadata about this file ------------------------------------------------
+__copyright__ = "Copyright (c) 2019-2021 Arm Limited"
+__license__ = "SPDX-License-Identifier: BSD-3-Clause"
+
+# Configuration file for the Sphinx documentation builder.
+
+# -- Path setup --------------------------------------------------------------
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+# -- Project information -----------------------------------------------------
+project = 'Firmware Test Builder'
+copyright = 'Copyright (c) 2019-2021 Arm Limited'
+author = 'Arm Limited'
+
+# The full version, including alpha/beta/rc tags
+with open('../version.txt', 'r') as f:
+    release = f.read()
+    f.close()
+version = release
+
+
+# -- General configuration ---------------------------------------------------
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = ['sphinx.ext.autosectionlabel', 'sphinxcontrib.plantuml',
+              'sphinxcontrib.moderncmakedomain']
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+source_suffix = '.rst'
+
+# The master toctree document.
+master_doc = 'index'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This pattern also affects html_static_path and html_extra_path.
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# Load the contents of the global substitutions file into the 'rst_prolog'
+# variable. This ensures that the substitutions are all inserted into each page.
+with open('global_substitutions.txt', 'r') as subs:
+  rst_prolog = subs.read()
+rst_prolog += "\n .. |RELEASE_NUMBER| replace:: %s" % (version)
+# Minimum version of sphinx required
+needs_sphinx = '2.0'
+
+# -- Options for HTML output -------------------------------------------------
+
+# Don't show the "Built with Sphinx" footer
+html_show_sphinx = False
+
+# Don't show copyright info in the footer (we have this content in the page)
+html_show_copyright = False
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+html_theme = "sphinx_rtd_theme"
+
+# The logo to display in the sidebar
+html_logo = 'resources/TrustedFirmware-Logo_standard-white.png'
+
+# Options for the "sphinx-rtd-theme" theme
+html_theme_options = {
+    'collapse_navigation': False, # Can expand and collapse sidebar entries
+    'prev_next_buttons_location': 'both', # Top and bottom of the page
+    'style_external_links': True # Display an icon next to external links
+}
+
+# -- Options for autosectionlabel --------------------------------------------
+
+# Only generate automatic section labels for document titles
+autosectionlabel_maxdepth = 1
+
+# -- Options for plantuml ----------------------------------------------------
+
+plantuml_output_format = 'svg_img'
diff --git a/docs/global_substitutions.txt b/docs/global_substitutions.txt
new file mode 100644
index 0000000..095c68c
--- /dev/null
+++ b/docs/global_substitutions.txt
@@ -0,0 +1,26 @@
+.. |FTB| replace:: :term:`FTB`
+.. |CppUMock| replace:: :term:`CppUMock`
+.. |CppUTest| replace:: :term:`CppUTest`
+.. |Test case| replace:: :term:`Test case`
+.. |Test group| replace:: :term:`Test group`
+.. |Test suite| replace:: :term:`Test suite`
+.. |TFA_MAIL_LIST| replace:: `TF-A development`_
+.. |TS_MAIL_LIST| replace:: `TS Mailing List`_
+.. |TS_REPO| replace:: `TS repository`_
+.. |LCS| replace:: :term:`LCS`
+.. |FTB_REPO| replace:: `FTB repository`_
+.. |REST| replace:: reST
+.. |SEMVER| replace:: `Semantic Versioning`_
+
+.. _`TF-A development`: https://lists.trustedfirmware.org/pipermail/tf-a/
+.. _`TS Mailing List`: https://lists.trustedfirmware.org/mailman/listinfo/trusted-services
+.. _`FTB repository`: https://review.trustedfirmware.org/admin/repos/shared/firmware-test-builder
+.. _`TS repository`: https://review.trustedfirmware.org/admin/repos/TS/trusted-services
+.. _`Semantic Versioning`: https://semver.org/spec/v2.0.0.html
+
+..
+    --------------
+
+    *Copyright (c) 2019-2021, Arm Limited. All rights reserved.*
+
+    SPDX-License-Identifier: BSD-3-Clause
diff --git a/docs/implementing_tests.rst b/docs/implementing_tests.rst
new file mode 100644
index 0000000..fe3cb4a
--- /dev/null
+++ b/docs/implementing_tests.rst
@@ -0,0 +1,331 @@
+Implementing tests
+==================
+
+Concept of unit testing
+-----------------------
+
+First of all unit tests exercise the C code on a function level. The tests should call functions directly from the code under
+tests and verify if their return values are matching the expected ones and the functions are behaving according to the
+specification.
+
+Because of the function level testing the dependencies of the tested functions should be detached. This is done by mocking the
+underlying layer. This provides an additional advantage of controlling and verifying all the call to the lower layer.
+
+
+Adding new unit test suite
+--------------------------
+
+The first step is to define a new unit test suite. If a completely new module is being test the test suite definition should be
+created in a separate ``.cmake`` file which is placed in the test files' directory. Otherwise the test definition can be added
+to an existing ``.cmake`` file. These files should be included in the root ``CMakeLists.txt``.
+
+The ``UnitTest`` CMake module defines the ``unit_test_add_suite`` function so before using this function the module must be
+included in the ``.cmake`` file. The function first requires a unique test name which will be test binary's name. The test
+sources, include directories and macro definition are passed to the function in the matching arguments. CMake variables can be
+used to reference files relative to common directories:
+
+- ``CMAKE_CURRENT_LIST_DIR`` - Relative to the ``.cmake`` file
+- :cmake:variable:`UNIT_TEST_PROJECT_PATH` - Relative to the project's root directory
+
+.. code-block:: cmake
+
+  # tests/new_module/new_test_suite.cmake
+  include(UnitTest)
+
+  unit_test_add_suite(
+  	NAME [unique test name]
+  	SOURCES
+  		[source files]
+  	INCLUDE_DIRECTORIES
+  		[include directories]
+  	COMPILE_DEFINITIONS
+  		[defines]
+  )
+
+.. code-block:: cmake
+
+  # Root CMakeLists.txt
+  include(tests/new_module/new_test_suite.cmake)
+
+Example test definition
+^^^^^^^^^^^^^^^^^^^^^^^
+
+.. code-block:: cmake
+
+  unit_test_add_suite(
+  	NAME memcmp
+  	SOURCES
+  		${CMAKE_CURRENT_LIST_DIR}/test_memcmp.cpp
+  		${CMAKE_CURRENT_LIST_DIR}/memcmp.yml
+  	INCLUDE_DIRECTORIES
+  		${UNIT_TEST_PROJECT_PATH}/include
+  		${UNIT_TEST_PROJECT_PATH}/include/lib/libc/aarch64/
+  )
+
+
+Using c-picker
+--------------
+
+c-picker is a simple tool used for detaching dependencies of the code under test. It can copy elements (i.e. functions,
+variables, etc.) from the original source code into generated files. This way the developer can pick functions from compilation
+units and surround them with a mocked environment.
+
+If a ``.yml`` file listed among source files the build system invokes c-picker and the generated ``.c`` file is implicitly added
+to the source file list.
+
+Example .yml file
+^^^^^^^^^^^^^^^^^
+
+In this simple example c-picker is instructed to copy the include directives and the ``memcmp`` function from the
+``lib/libc/memcmp.c`` file. The root directory of the source files referenced by c-picker is the project's root directory.
+
+.. code-block:: yaml
+
+  elements:
+  - file: lib/libc/memcmp.c
+    type: include
+  - file: lib/libc/memcmp.c
+    type: function
+    name: memcmp
+
+
+Writing unit tests
+------------------
+
+Unit test code should be placed in ``.cpp`` files.
+
+Four-phase test pattern
+^^^^^^^^^^^^^^^^^^^^^^^
+
+All tests cases should follow the four-phase test pattern. This consists of four simple steps that altogether ensure the
+isolation between test cases. These steps follows below.
+
+- Setup
+- Exercise
+- Verify
+- Teardown
+
+After the teardown step all global states should be the same as they were at the beginning of the setup step.
+
+CppUTest
+^^^^^^^^
+
+CppUTest is an open source unit testing framework for C/C++. It is written in C++ so all the useful features of the language is
+available while testing. It automatically collects and runs the defined ``TEST_GROUPS`` and provides an interface for
+implementing the four-phase test pattern. Furthermore the framework has assertion macros for many variable types and test
+scenarios.
+
+Include
+'''''''
+
+The unit test source files should include the CppUTest header after all other headers to avoid conflicts.
+
+.. code-block:: C++
+
+  // Other headers
+  // [...]
+
+  #include "CppUTest/TestHarness.h"
+
+Test group
+''''''''''
+
+The next step is to define a test group. When multiple tests cases are written around testing the same function or couple
+related functions these tests cases should be part of the same test group. Basically test cases in a test group share have same
+setup/teardown sequence. In CppUTest the ``TEST_GROUP`` macro defines a new class which can contain member variables and
+functions. Special setup/teardown function are defined using ``TEST_SETUP`` and ``TEST_TEARDOWN`` macros. These functions are
+called before/after running each test case of the group so all the common initilization and cleanup code should go into these
+functions.
+
+.. code-block:: C++
+
+  TEST_GROUP(List) {
+  	TEST_SETUP() {
+  		list = list_alloc();
+  	}
+
+  	TEST_TEARDOWN() {
+  		list_cleanup(list);
+  	}
+
+  	bool has_element(int value) {
+  		for (int i = 0; i < list_count (list); i++) {
+  			if (list_get(i) == value) { return true; }
+  		}
+  		return false;
+  	}
+
+  	List* list;
+  };
+
+
+Test case
+'''''''''
+
+Test cases are defined by the ``TEST`` macro. This macro defines a child class of the test group's class so it can access the
+member functions and variables of the test group. The test case's block itself is the body of the function of the child class.
+
+.. code-block:: C++
+
+  TEST(List, add_one) {
+  	// Exercise
+  	const int test_value = 5;
+  	list_add(list, test_value);
+
+  	// Verify using CHECK_TRUE assertion and TEST_GROUP member function
+  	CHECK_TRUE(has_element(test_value));
+  }
+
+  TEST(List, add_two) {
+  	// Exercise
+  	const int test_value1 = 5;
+  	const int test_value2 = 6;
+  	list_add(list, test_value1);
+  	list_add(list, test_value2);
+
+  	// Verify
+  	CHECK_TRUE(has_element(test_value1));
+  	CHECK_TRUE(has_element(test_value2));
+  }
+
+CppUMock
+^^^^^^^^
+
+During unit testing the dependencies of the tested functions should be replaced by stubs or mocks. When using mocks the
+developer would usually like to check if the function was called with corrent parameters and would like to return controlled
+values from the function. When a mocked function is called multiple times from the tested function maybe it should check or
+return different values on each call. This is where CppUMock comes handy.
+
+All CppUMock interactions start with calling the ``mock()`` function. This returs a reference to the mocking system. At this
+point the developer either wants to define expected or actual calls. This is achiveable by calling
+``expectOneCall(functionName)`` or ``expectNCalls(amount, functionName)`` or ``actualCall(functionName)`` member functions of
+``mock()`` call's return value. Registering expected calls are done in the test case before exercising the code and actual calls
+happen from the mocked functions.
+
+After this point the following functions can be chained:
+
+- ``onObject(object)`` - In C++ it is usually the ``this`` pointer but it can be
+  useful in C too.
+- ``with[type]Parameter(name, value)`` - Specifying and checking call parameters
+- ``andReturnValue(result)`` - Specifying return value when defining expected
+  call
+- ``return[type]Value()`` - Returning value from function
+
+The mocking system has two important functions. ``mock().checkExpectation()`` checks if all the expected calls have been
+fulfilled and and the ``mock().clear()`` removes all the expected calls from CppUMock's registry. These two functions are
+usually called from the ``TEST_TEARDOWN`` function because there should not be any crosstalk between test cases through the
+mocking system.
+
+CppUMock's typical use-case is shown below by a simple example of the ``print_to_eeprom`` function.
+
+.. code-block:: C++
+
+  int eeprom_write(const char* str); /* From eeprom.h */
+
+  int printf_to_eeprom(const char* format, ...) {
+  	char buffer[256];
+  	int length, written_bytes = 0, eeprom_write_result;
+  	va_list args;
+
+  	va_start(args, format);
+  	length = vsnprintf(buffer, sizeof(buffer), format, args);
+  	va_end(args);
+
+  	if (length < 0) {
+  		return length;
+  	}
+
+  	while(written_bytes < length) {
+  		eeprom_write_result = eeprom_write(&buffer[written_bytes]);
+  		if (eeprom_write_result < 0) {
+  			return eeprom_write_result;
+  		}
+  		written_bytes += eeprom_write_result;
+  	}
+
+  	return written_bytes;
+  }
+
+Having the code snipped above a real life usage of the function would look like something shown in the following sequence
+diagram.
+
+.. uml:: resources/sequence_print_to_eeprom.puml
+
+It would be really hard to test unit this whole system so all the lower layers should be separated and mock on the first
+possible level. In the following example the ``print_to_eeprom`` function is being tested and the ``eeprom_write`` function is
+mocked. In test cases where ``eeprom_write`` function is expected to be called the test case should first call the
+``expect_write`` function. This registers an expected call to CppUMocks internal database and when the call actually happens it
+matches the call parameters with the entry in the database. It also returns the previously specified value.
+
+.. code-block:: C++
+
+  TEST_GROUP(printf_to_eeprom) {
+  	TEST_TEARDOWN() {
+  		mock().checkExpectations();
+  		mock().clear();
+  	}
+
+  	void expect_write(const char* str, int result) {
+  		mock().expectOneCall("eeprom_write").withStringParameter("str", str).
+  			andReturnValue(result);
+  	}
+  };
+
+  /* Mocked function */
+  int eeprom_write(const char* str) {
+  	return mock().actualCall("eeprom_write").withStringParameter("str", str).
+  		returnIntValue();
+  }
+
+  TEST(printf_to_eeprom, empty) {
+  	LONGS_EQUAL(0, printf_to_eeprom(""))
+  }
+
+  TEST(printf_to_eeprom, two_writes) {
+  	expect_write("hello1hello2", 6);
+  	expect_write("hello2", 6);
+  	LONGS_EQUAL(12, printf_to_eeprom("hello%dhello%d", 1, 2))
+  }
+
+  TEST(printf_to_eeprom, error) {
+  	expect_write("hello", -1);
+  	LONGS_EQUAL(-1, printf_to_eeprom("hello"))
+  }
+
+This how the ``printf_to_eeprom/two_writes`` test case's sequence diagram looks like after mocking ``eeprom_write``. The test
+case became able to check the parameters of multiple calls and it could return controlled values.
+
+.. uml:: resources/sequence_print_to_eeprom_mock.puml
+
+
+Analyzing code coverage
+-----------------------
+
+The code coverage reports can be easily used for finding untested parts of the code. The two main parts of the coverage report
+are the line coverage and the branch coverage. Line coverage shows that how many times the tests ran the given line of the
+source code. It is beneficial to increase the line coverage however 100% line coverage is still not enough to consider the code
+fully tested.
+
+Let's have a look on the following example.
+
+.. code-block:: C++
+
+  void set_pointer_value(unsigned int id, unsigned int value) {
+  	unsigned int *pointer;
+
+  	if (id < MAX_ID) {
+  		pointer = get_pointer(id);
+  	}
+
+  	*pointer = value;
+  }
+
+The 100% line coverage is achievable by testing the function with an ``id`` value smaller than ``MAX_ID``. However if an ``id``
+larger than or equal to ``MAX_ID`` is used as a parameter of this function it will try to write to a memory address pointed by
+an uninitialized variable. To catch untested conditions like this the branch coverage comes handy. It will show that only one
+branch of the  ``if`` statement has been tested as the condition was always true in the tests.
+
+
+--------------
+
+*Copyright (c) 2019-2021, Arm Limited. All rights reserved.*
diff --git a/docs/index.rst b/docs/index.rst
new file mode 100644
index 0000000..32b066a
--- /dev/null
+++ b/docs/index.rst
@@ -0,0 +1,44 @@
+Welcome to the Firmware Test Builds's documentation!
+====================================================
+
+.. toctree::
+   :maxdepth: 1
+   :hidden:
+   :numbered:
+
+   Home<self>
+   user_guide
+   implementing_tests
+   components/index
+   project/index
+
+This repository contains the unit testing framework.
+
+These tests are meant to run on host machine and used to cover platform independent code on the unit test level. In this case a
+unit is considered to be a C function or couple related functions. Each unit test suite compiles into a binary which can be run
+and debugged as any ordinary executable.
+
+The system uses CppUTest as unit testing framework. The tests are written in C++ in order to be able to use CppUTests' all
+useful features like the automatic collection of test cases and the CppUMock mocking system.
+
+Separating dependencies apart from the code under test is a crutial step in unit testing systems. In many cases this can be
+easily done by linking mocked functions to the tested code but sometimes it's difficult like when the code under test and its
+dependencies are in the same compilation unit. For separating the code under test from its dependencies a tool called c-picker
+can be used. It can pick pieces of code (functions, variables, etc.) based on descriptor files.
+
+The build system is based on CMake. The repository contains CMake modules for defining unit test suites. It also invokes
+c-picker if a descriptor file is listed among the test sources. CMake has a built in test driver system called ctest. It runs
+all the test binaries and produces an well structured output. Test filtering and parallel test run is also available.
+
+For measuring unit test coverage lcov is utilized. The coverage of c-picker generated sources is mapped to the original sources
+files. Coverage currently only works with GCC.
+
+As a next step start with reading the :ref:`User guide` and the :ref:`Implementing tests` section of this manual. For detailed
+description of the components check the :ref:`Component user manuals` section.
+
+
+--------------
+
+*Copyright (c) 2019-2021, Arm Limited. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause
diff --git a/docs/project/change-log.rst b/docs/project/change-log.rst
new file mode 100644
index 0000000..037f6da
--- /dev/null
+++ b/docs/project/change-log.rst
@@ -0,0 +1,29 @@
+Change Log & Release Notes
+==========================
+
+This document contains a summary of the new features, changes, fixes and known issues in each release of Trusted Services.
+
+Version 1.0.0
+-------------
+
+New Features
+^^^^^^^^^^^^
+First release.
+
+Changes
+^^^^^^^
+None.
+
+Resolved Issues
+^^^^^^^^^^^^^^^
+None.
+
+Deprecations
+^^^^^^^^^^^^
+None.
+
+--------------
+
+*Copyright (c) 2020-2021, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause
diff --git a/docs/project/coding-guidelines.rst b/docs/project/coding-guidelines.rst
new file mode 100644
index 0000000..1f96c57
--- /dev/null
+++ b/docs/project/coding-guidelines.rst
@@ -0,0 +1,69 @@
+Coding Style & Guidelines
+=========================
+
+The following sections contain |FTB| coding guidelines. They are continually evolving and should not be considered "set
+in stone". Feel free to question them and provide feedback.
+
+The |FTB| project uses multiple "domains" (textual content types, like programming languages) and each defines its own
+rules.
+
+To help configuring text editors the project comes with "`EditorConfig`_" file(s). (:download:`../../.editorconfig`).
+
+Shared rules
+------------
+
+The following rules are common for all domains, except where noted otherwise:
+
+#. Files shall be **UTF-8** encoded.
+#. Use **Unix** style line endings (``LF`` character)
+#. The primary language of the project is English. All comments and documentation must be in this language.
+#. Trailing whitespace is not welcome, please trim these.
+
+C/C++ Domain
+------------
+
+C source code rules are base on the *Linux Coding Style* (See: |LCS|). The following deviations apply:
+
+5. C code in |FTB| follows *ISO/IEC 9899:1999* standard.
+#. C++ code in |FTB| follows *ISO/IEC 14882:2011* standard (C++ 11)
+#. Line length shall not exceed 100 characters.
+#. Use `snake_case`_ for function, variable and file names.
+#. Each file shall be "self contained" and include header files with external dependencies. No file shall depend on
+   headers included by other files.
+#. Include ordering: please include project specific headers first and then system includes. Please order the files
+   alphabetically in the above two groups.
+#. All variables must be initialized.
+
+CMake domain
+------------
+
+11. CMake file names use `CamelCase`_ style.
+#. Indent with tabs and otherwise use spaces. Use 4 spaces for tab size.
+#. Use LF as line end in CMake files.
+#. Remove trailing whitespace.
+#. Maximum line length is 128 characters.
+#. When complicated functionality is needed prefer CMake scripting over other languages.
+#. Prefix local variables with `_`.
+#. Use functions to prevent global name-space pollution.
+#. Use `snake_case`_ for function and variable names.
+#. Use the ``include_guard()`` CMake function when creating new modules, to prevent multiple inclusion.
+#. Use self contained modules, i.e. include direct dependencies of the module.
+#. Use the Sphinx CMake domain for in-line documentation of CMake scripts. For details please refer to the
+   `CMake Documentation`_.
+
+Restructured Text Domain
+------------------------
+
+Please refer to :ref:`Writing documentation`.
+
+--------------
+
+.. _`CamelCase`: https://hu.wikipedia.org/wiki/CamelCase
+.. _`snake_case`: https://en.wikipedia.org/wiki/Snake_case
+.. _`CMake Documentation`: https://github.com/Kitware/CMake/blob/master/Help/dev/documentation.rst
+.. _`EditorConfig`: https://editorconfig.org/
+.. _`Uncrustify`: https://github.com/uncrustify/uncrustify
+
+*Copyright (c) 2020-2021, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause
diff --git a/docs/project/contributing.rst b/docs/project/contributing.rst
new file mode 100644
index 0000000..7eefb2e
--- /dev/null
+++ b/docs/project/contributing.rst
@@ -0,0 +1,83 @@
+Contributing
+============
+
+
+Getting Started
+---------------
+
+- Make sure you have a GitHub account and you are logged on `developer.trustedfirmware.org`_.
+- Send an email to the |TS_MAIL_LIST| about your work. This gives everyone visibility of whether others are working on something
+  similar.
+- Clone the |FTB_REPO| on your own machine.
+- Create a local topic branch based on ``main`` branch of the |FTB_REPO|.
+
+Making Changes
+--------------
+
+- Make commits of logical units. See these general `Git guidelines`_ for contributing to a project.
+- Follow the :ref:`Coding Style & Guidelines`.
+- Keep the commits on topic. If you need to fix another bug or make another enhancement, please create a separate change.
+- 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. Please keel the 50/72 rule (for details see `Tim Popes blog entry`_.)
+- Where appropriate, please update the documentation.
+
+   - Consider whether the this document or other in-source documentation needs updating.
+
+   - 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 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.
+   - 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 :ref:`maintainers` 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.
+
+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, 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 ``main`` branch.
+
+- The changes will then undergo further review and testing by the :ref:`maintainers`. Any review comments will be made
+  directly on your patch. This may require you to do some rework.
+
+  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 ``main`` 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 ``main`` branch or ask you to do so.
+
+--------------
+
+.. _developer.trustedfirmware.org: https://developer.trustedfirmware.org
+.. _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
+.. _`Tim Popes blog entry`: https://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
+
+
+*Copyright (c) 2019-2021, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause
diff --git a/docs/project/glossary.rst b/docs/project/glossary.rst
new file mode 100644
index 0000000..7f9c402
--- /dev/null
+++ b/docs/project/glossary.rst
@@ -0,0 +1,38 @@
+Glossary
+========
+
+This glossary provides definitions for terms and abbreviations used in the unit testing framework's documentation.
+
+You can find additional definitions in the `Arm Glossary`_.
+
+.. glossary::
+   :sorted:
+
+   CppUMock
+      Built-in mocking system of CppUTest.
+
+   CppUTest
+      Open source C/C++ unit testing framework.
+
+   FTB
+      Firmware Test Builder
+
+   LCS
+     `Linux Coding Style`_
+
+   Test case
+      Single use case tested. Defined by ``TEST`` macro of CppUTest.
+
+   Test group
+      Multiple test cases with common setup/teardown steps and helper functions and variables. Defined by ``TEST_GROUP`` macro
+      of CppUTest.
+
+   Test suite
+      Test binary which contains one or more test groups. Defined by :cmake:command:`unit_test_add_suite` CMake function.
+
+--------------
+
+*Copyright (c) 2020-2021, Arm Limited. All rights reserved.*
+
+.. _`Arm Glossary`: https://developer.arm.com/support/arm-glossary
+.. _`Linux Coding Style`: https://www.kernel.org/doc/html/v4.10/process/coding-style.html
diff --git a/docs/project/index.rst b/docs/project/index.rst
new file mode 100644
index 0000000..9934ff6
--- /dev/null
+++ b/docs/project/index.rst
@@ -0,0 +1,22 @@
+About the project
+=================
+
+.. toctree::
+    :maxdepth: 1
+    :caption: Contents:
+
+    change-log
+    coding-guidelines
+    contributing
+    glossary
+    license
+    maintainers
+    versioning_policy
+    writing-documentation
+
+
+--------------
+
+*Copyright (c) 2020-2021, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause
\ No newline at end of file
diff --git a/docs/project/license.rst b/docs/project/license.rst
new file mode 100644
index 0000000..ac98f00
--- /dev/null
+++ b/docs/project/license.rst
@@ -0,0 +1,37 @@
+License
+=======
+
+Copyright (c) 2019-2021, Arm Limited and Contributors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+-  Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+-  Redistributions in binary form must reproduce the above copyright notice, this
+   list of conditions and the following disclaimer in the documentation and/or
+   other materials provided with the distribution.
+-  Neither the name of Arm nor the names of its contributors may be used to
+   endorse or promote products derived from this software without specific prior
+   written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+--------------
+
+*Note*:
+Individual files contain the following tag instead of the full license text.
+
+    SPDX-License-Identifier:    BSD-3-Clause
+
+This enables machine processing of license information based on the SPDX
+License Identifiers that are here available: http://spdx.org/licenses/
diff --git a/docs/project/maintainers.rst b/docs/project/maintainers.rst
new file mode 100644
index 0000000..9cd0f4a
--- /dev/null
+++ b/docs/project/maintainers.rst
@@ -0,0 +1,41 @@
+Maintainers
+===========
+
+|FTB| is a trustedfirmware.org maintained component used by multiple trustedfirmware.org projects. All contributions are
+ultimately merged by the maintainers listed below. Technical ownership of some parts of the code-base is delegated to the code
+owners listed below. An acknowledgment from these code maintainers may be required before the maintainers merge a contribution.
+
+More details may be found in the `Project Maintenance Process`_ document.
+
+This file follows the format of the Linux Maintainers file. For details on the meaning of tags below please refer to the
+`Linux Maintainers file`_.
+
+Main maintainers
+----------------
+:M: György Szing <gyorgy.szing@arm.com>
+:G: `gyuri-szing`_
+:L: |TS_MAIL_LIST|
+:M: Imre Kis <imre.kis@arm.com>
+:G: `imre-kis-arm`_
+:M: Lauren Wehrmeister <Lauren.Wehrmeister@arm.com>
+:G: `laurenw-arm`_
+:L: |TFA_MAIL_LIST|
+
+Code owners
+--------------------
+
+Cyrrently there are no code owners.
+
+--------------
+
+.. _danh-arm: https://github.com/danh-arm
+.. _gyuri-szing: https://github.com/gyuri-szing
+.. _imre-kis-arm: https://github.com/imre-kis-arm
+.. _laurenw-arm: https://github.com/laurenw-arm
+
+.. _`Linux Maintainers file`: https://github.com/torvalds/linux/blob/master/MAINTAINERS#L80
+.. _Project Maintenance Process: https://developer.trustedfirmware.org/w/collaboration/project-maintenance-process/
+
+*Copyright (c) 2020-2021, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause
diff --git a/docs/project/versioning_policy.rst b/docs/project/versioning_policy.rst
new file mode 100644
index 0000000..90d54f0
--- /dev/null
+++ b/docs/project/versioning_policy.rst
@@ -0,0 +1,42 @@
+Versioning policy
+==================
+
+This document captures information about the version identifier used by the project. It tells the meaning of each part, where
+the version information is captured and how it is managed.
+
+Summary
+-------
+
+The version identifier identifies the feature set supported by a specific release, and captures compatibility information to
+other releases.
+
+This project uses "Semantic Versioning", for details please refer to |SEMVER|.
+
+In general the version number is constructed from three numbers. The `MAJOR` number is changed when incompatible API changes are
+introduced, the `MINOR` version when you functionality is added in a backward compatible manner, and the `PATCH` version when
+backwards compatible bug fixes are added.
+
+Each release will get a unique release id assigned. When a release is made, the version number will get incremented in
+accordance with the compatibility rules mentioned above.
+
+This project is only using the core version and will not use pre-release or build specific metadata extension.
+
+Storage and format
+------------------
+
+The version number of each release will be stored at two locations:
+  #. In a tag of the version control system in the form of "vX.Y.Z" where X Y and Z are the major, minor and patch version
+     numbers.
+  #. In a file called version.txt. This file uses ASCII encoding and will contain the version number as "X.Y.Z"  where X Y and
+     Z are the major, minor and patch version numbers.
+
+.. note:: The version id is independent from version identifiers of the
+          versioning system used to store the |FTB| (i.e. git).
+
+--------------
+
+.. _`Semantic Versioning`: https://semver.org/spec/v2.0.0.html
+
+*Copyright (c) 2020-2021, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause
diff --git a/docs/project/writing-documentation.rst b/docs/project/writing-documentation.rst
new file mode 100644
index 0000000..ca55b32
--- /dev/null
+++ b/docs/project/writing-documentation.rst
@@ -0,0 +1,52 @@
+Writing documentation
+=====================
+
+|FTB| is documented using `Sphinx`_, which in turn uses Docutils and `Restructured Text`_ (|REST| hereafter).
+
+The source files for the documents are in the *docs* directory of the |FTB_REPO|.
+
+The preferred output format is *HTML*, and other formats may or may not work.
+
+
+Section Headings
+----------------
+
+In order to avoid problems if documents include each other, it is important to follow a consistent section heading
+style. Please use at most five heading levels. Please use the following style::
+
+    First-Level Title
+    =================
+
+    Second-Level Title
+    ------------------
+
+    Third-Level Title
+    '''''''''''''''''
+
+    Forth-level Title
+    """""""""""""""""
+
+    Fifth-level Title
+    ~~~~~~~~~~~~~~~~~
+
+
+Inline documentation
+--------------------
+
+To get all information integrated into a single document the project uses Sphinx extensions to allow capturing inline
+documentation into this manual.
+
+
+CMake
+'''''
+
+Apologies, this section is not ready yet. Please check existing cmake and |REST| files to see how documentation can be added.
+
+--------------
+
+.. _`Restructured Text`: https://docutils.sourceforge.io/rst.html
+.. _`Sphinx`: https://www.sphinx-doc.org
+
+*Copyright (c) 2020-2021, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause
diff --git a/docs/resources/TrustedFirmware-Logo_standard-white.png b/docs/resources/TrustedFirmware-Logo_standard-white.png
new file mode 100644
index 0000000..e7bff71
--- /dev/null
+++ b/docs/resources/TrustedFirmware-Logo_standard-white.png
Binary files differ
diff --git a/docs/resources/sequence_print_to_eeprom.puml b/docs/resources/sequence_print_to_eeprom.puml
new file mode 100644
index 0000000..8ba7190
--- /dev/null
+++ b/docs/resources/sequence_print_to_eeprom.puml
@@ -0,0 +1,46 @@
+'-------------------------------------------------------------------------------
+' Copyright (c) 2019-2021, Arm Limited and Contributors. All rights reserved.
+'
+' SPDX-License-Identifier: BSD-3-Clause
+'
+'-------------------------------------------------------------------------------
+
+@startuml
+participant Application as APP
+
+activate APP
+APP -> Print: print_to_eeprom(fmt, ...)
+activate Print
+
+	Print -> EEPROM: eeprom_write(buffer)
+	activate EEPROM
+
+		EEPROM -> I2C: i2c_write(address, buffer)
+		activate I2C
+
+			I2C -> Hardware: I2C transaction
+			activate Hardware
+			Hardware --> I2C: ack/nack
+			deactivate Hardware
+
+		I2C --> EEPROM: result
+		deactivate I2C
+
+		EEPROM -> I2C: i2c_write(address, buffer+ result)
+		activate I2C
+
+			I2C -> Hardware: I2C transaction
+			activate Hardware
+			Hardware --> I2C: ack/nack
+			deactivate Hardware
+
+		I2C --> EEPROM: result
+		deactivate I2C
+
+	EEPROM --> Print: result
+	deactivate EEPROM
+
+Print -> APP: result
+deactivate Print
+
+@enduml
\ No newline at end of file
diff --git a/docs/resources/sequence_print_to_eeprom_mock.puml b/docs/resources/sequence_print_to_eeprom_mock.puml
new file mode 100644
index 0000000..ce394d4
--- /dev/null
+++ b/docs/resources/sequence_print_to_eeprom_mock.puml
@@ -0,0 +1,48 @@
+'-------------------------------------------------------------------------------
+' Copyright (c) 2019-2021, Arm Limited and Contributors. All rights reserved.
+'
+' SPDX-License-Identifier: BSD-3-Clause
+'
+'-------------------------------------------------------------------------------
+
+@startuml
+participant "Test case" as TC
+participant "Code under test" as CUT
+
+group Setting expectations
+	activate TC
+	TC -> Mock: expect_write("hello1hello2", 6)
+	activate Mock
+	deactivate Mock
+	TC -> Mock: expect_write("hello2", 6)
+	activate Mock
+	deactivate Mock
+end
+
+TC -> CUT: print_to_eeprom("hello%dhello%d", 1, 2)
+activate CUT
+
+	group Using mocked interface
+		CUT -> Mock: eeprom_write("hello1hello2")
+		activate Mock
+		Mock --> CUT: 6
+		deactivate Mock
+
+		CUT -> Mock: eeprom_write("hello2")
+		activate Mock
+		Mock --> CUT: 6
+		deactivate Mock
+	end
+
+CUT --> TC: 6 + 6 = 12
+deactivate CUT
+
+TC -> Mock: mock().checkExpectation()
+activate Mock
+deactivate Mock
+
+TC -> Mock: mock().clear()
+activate Mock
+deactivate Mock
+
+@enduml
\ No newline at end of file
diff --git a/docs/user_guide.rst b/docs/user_guide.rst
new file mode 100644
index 0000000..4c214f4
--- /dev/null
+++ b/docs/user_guide.rst
@@ -0,0 +1,201 @@
+User guide
+==========
+
+This page describes how to get started with compiling and running unit tests on the host machine.
+
+Host machine requirements
+-------------------------
+
+The system has been successfully tested on the following platforms:
+
+- Ubuntu 19.04
+- Ubuntu 18.04
+- Arch Linux
+- MSYS2 MinGW64
+
+Tools
+-----
+
+The following applications are expected to be installed in the build machine:
+
+- CMake >=3.11
+
+- Python >=3.4
+
+- c-picker
+
+  - pyyaml
+
+  - clang (pip package if not included in libclang)
+
+  - libclang
+
+- git
+
+- Toolchain
+
+- Native build system
+
+Ubuntu 19.04
+^^^^^^^^^^^^
+
+On Ubuntu 19.04 use the following commands to install the required tools:
+
+::
+
+  sudo apt-get install cmake git python3 python3-pip libclang-dev build-essential
+  sudo pip3 install git+[TBD]
+
+Ubuntu 18.04
+^^^^^^^^^^^^
+
+The official Ubuntu 18.04 package repository only contains CMake 3.10 which not satisfies the requirements for building unit
+tests. Fortunately there's an official CMake APT repository provided by Kitware: https://apt.kitware.com/ By adding this server
+to the repository list an up-to-date version of CMake can be installed on Ubuntu 18.04.
+
+::
+
+  wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc \
+    2>/dev/null | sudo apt-key add -
+  sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ bionic main'
+
+  sudo apt-get install cmake git python3 python3-pip libclang-dev build-essential
+  sudo pip3 install git+[TBD]
+
+Arch Linux
+^^^^^^^^^^
+
+On Arch Linux use the following commands to install the required tools:
+
+::
+
+  sudo pacman -Sy cmake git python python-pip python-yaml make gcc clang
+  sudo pip install git+[TBD]
+
+MSYS2 MinGW64
+^^^^^^^^^^^^^
+
+::
+
+  pacman -Sy mingw-w64-x86_64-cmake git mingw-w64-x86_64-python3 \
+    mingw-w64-x86_64-python3-pip make mingw-w64-x86_64-gcc mingw-w64-x86_64-clang
+  pip install git+[TBD]]
+
+
+Integrating firmware test builder into a project
+------------------------------------------------
+
+The firmware test builder can be simply integrated into a CMake based project by adding the lines below to its CMakeLists.txt.
+This example shows how to fetch the firmware test builder files on demand using CMake's FetchContent module.
+
+::
+
+  FetchContent_Declare(
+    firmware_test_builder
+    GIT_REPOSITORY ${FIRMWARE_TEST_BUILDER_URL}
+    GIT_TAG ${FIRMWARE_TEST_BUILDER_REFSPEC}
+    GIT_SHALLOW TRUE
+  )
+
+  FetchContent_GetProperties(firmware_test_builder)
+  if(NOT firmware_test_builder_POPULATED)
+    message(STATUS "Fetching Firmware Test Builder")
+    FetchContent_Populate(firmware_test_builder)
+  endif()
+
+  # Appending Firmware Test Builder's cmake directory to CMake module path
+  list(APPEND CMAKE_MODULE_PATH ${firmware_test_builder_SOURCE_DIR}/cmake)
+
+For more details on adding tests see :ref:`Implementing tests` chapter.
+
+
+Building unit tests
+-------------------
+
+Building unit tests start with running CMake which will check all the prerequisites and generate the native build system's input
+files. This example uses Unix Makefiles. Unit tests exercise the code directly by compiling it into the same binary as the test
+code.
+
+::
+
+  cd project
+  mkdir build
+  cd build
+  cmake -G"Unix Makefiles" ..
+
+After running the previous steps the makefiles are generated into the build directory so make can build unit tests. During unit
+test development if only the source files have changed it's not necessary to re-run cmake it's only needed to run make as shown
+below.
+
+::
+
+  make -j
+
+For building single unit test suites the test's name can be used as a makefile target. Let's assume there's a test suite called
+best_unit_tests.
+
+::
+
+  make best_unit_tests
+
+
+Running unit tests
+------------------
+
+CMake provides a built-in tool called ctest for running all the tests using a single command. It is also able to filter tests or
+run them in parallel for speeding up the tests process. Run all the tests using the following command:
+
+::
+
+  ctest
+
+Each unit test suite has its own executable. The easiest way of running single test suite is running it as a simple executable.
+
+::
+
+  ./best_unit_tests
+
+
+Debugging unit tests
+--------------------
+
+As it was mentioned in the previous section test suites are basically separate executables so they can be debugged as any other
+native applications on the host machine. In a Linux environment gdb or IDE's built-in debugger can be utilized for debugging.
+
+::
+
+  gdb ./best_unit_tests
+
+
+Measuring code coverage
+-----------------------
+
+Inspecting code coverage is a useful method for detecting parts of the code which is not exercised by tests. The build system
+includes an option for generating code coverage report of the unit tests. The coverage is processed by ``lcov`` which needs to
+be installed for this feature. Also the coverage measurement in only available when GCC is used as a compiler.
+
+The methods for enabling coverage measurement is project dependent.
+
+Before collecting coverage info and generating reports the tests must be run as the coverage is a runtime measurement. See
+section `Running unit tests`_ for more information about running unit tests.
+
+In case of enabled coverage report the system adds two new build targets called ``coverage`` and ``coverage_report``. They can
+be used simply by running the following commands if ``make`` is used as a build system.
+
+::
+
+  make coverage
+  make coverage_report
+
+The ``coverage`` target generates lcov info files for further processing. If there are coverage files available from different
+sources (i.e. coverages of other tests) they can be merged with the unit test coverage file and evaluated together.
+
+The ``coverage_report`` target generates a HTML report from the coverage info files. The coverage reports can be found in the
+build directory. The report shows the directory structure of the code and each file can be inspected individually. Line,
+function and branch coverage is included.
+
+
+--------------
+
+*Copyright (c) 2019-2021, Arm Limited. All rights reserved.*
+SPDX-License-Identifier: BSD-3-Clause