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+Variables
+=========
+
+.. default-domain:: cmake
+
+.. contents::
+
+This page documents variables that are provided by the build system, grouped by
+the component that manages them. For general information on variables in CMake,
+see the :ref:`Variables <CMake Language Variables>` section of the
+:manual:`cmake-language(7) <manual:cmake-language(7)>` manual.
+
+Intrinsic Variables
+-------------------
+
+Variables defined by CMake, but which have a value or meaning defined by the
+Trusted Firmware-A build system. For documentation on *all* intrinsic CMake
+variables, see the :manual:`cmake-variables(7) <manual:cmake-variables(7)>`
+manual.
+
+.. toctree::
+    :glob:
+    :maxdepth: 1
+
+Common Variables
+----------------
+
+Variables which are always defined.
+
+.. toctree::
+    :glob:
+    :maxdepth: 1
+
+    variable/common/*
+
+Bootloader Variables
+--------------------
+
+Variables defined by individual bootloader images. These variables may not be
+defined if the bootloader image is not compatible with the platform.
+
+Library Variables
+-----------------
+
+Variables defined by individual libraries and other non-core components. These
+variables may not be defined if the library or component is not being included
+in the build.
+
+Driver Variables
+----------------
+
+Variables defined by individual drivers. These variables may not be defined if
+the driver is not being included in the build.
+
+Platform Variables
+------------------
+
+Variables defined by individual platforms. These variables may not be defined if
+the platform is not being included in the build.
+
+--------------
+
+*Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.*