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+Software Requirements
+=====================
+
+As of today the only available normal-world interface for Trusted Services is available trough linux. Building and end-to-end
+firmware stack requires compiling the Linux Kernel and linux user space applications. This restricts the possible host
+environments to Linux distributions.
+While some TS components can be built under Windows this scenario is not mandated by this documentation.
+
+The preferred host environment is Ubuntu 18.04.
+
+The following tools are required:
+
+   * CMake, version 3.18.4. (See the `CMake download page`_.)
+   * GNU Make v4.1 or higher.
+   * Git v2.17 or newer.
+   * Python3.6 and the modules listed in ``<project>/requirements.txt``.
+   * GCC supporting the deployment.
+
+       * `opteesp` environment: a host to aarch64 cross-compiler is needed. Please use the compilers specified by the
+         `OP-TEE documentation`_.
+       * `arm-linux` environment: a host to aarch64 linux cross-compiler is needed. Please use the version `9.2-2019.12` of the
+         "aarch64-none-linux-gnu" compiler available from `arm Developer`_.
+         (Note: the compiler part of the OP-TEE build environment works too.)
+       * For `linux-pc` environment use the native version of GCC available in your Linux distribution.
+
+To build the documentation, please refer to :ref:`Building Documentation`.
+
+.. todo:: Add info on commit validation dependencies (checkpatch, uncrustify, etc...)
+
+--------------
+
+.. _OP-TEE documentation: https://optee.readthedocs.io/en/latest/building/gits/build.html#step-4-get-the-toolchains
+.. _arm Developer: https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-a/downloads
+.. _CMake download page: https://cmake.org/files/v3.18/
+
+*Copyright (c) 2020-2021, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause