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+documentation
+=============
+
+This is the directory that contains the Yocto Project documentation. The Yocto
+Project source repositories at http://git.yoctoproject.org/cgit.cgi have two
+instances of the "documentation" directory. You should understand each of
+these instances.
+
+ poky/documentation - The directory within the poky Git repository containing
+ the set of Yocto Project manuals. When you clone the
+ poky Git repository, the documentation directory
+ contains the manuals. The state of the manuals in this
+ directory is guaranteed to reflect the latest Yocto
+ Project release. The manuals at the tip of this
+ directory will also likely contain most manual
+ development changes.
+
+ yocto-docs/documentation - The Git repository for the Yocto Project manuals.
+ This repository is where manual development
+ occurs. If you plan on contributing back to the
+ Yocto Project documentation, you should set up
+ a local Git repository based on this upstream
+ repository as follows:
+
+ git clone git://git.yoctoproject.org/yocto-docs
+
+ Changes and patches are first pushed to the
+ yocto-docs Git repository. Later, they make it
+ into the poky Git repository found at
+ git://git.yoctoproject.org/poky.
+
+Manual Organization
+===================
+
+Folders exist for individual manuals as follows:
+
+* sdk-manual - The Yocto Project Software Development Kit (SDK) Developer's Guide.
+* bsp-guide - The Yocto Project Board Support Package (BSP) Developer's Guide
+* dev-manual - The Yocto Project Development Tasks Manual
+* kernel-dev - The Yocto Project Linux Kernel Development Tasks Manual
+* ref-manual - The Yocto Project Reference Manual
+* brief-yoctoprojectqs - The Yocto Project Quick Start
+* profile-manual - The Yocto Project Profile and Tracing Manual
+* toaster-manual - The Toaster Manual
+* test-manual - The Test Environment Manual
+
+Each folder is self-contained regarding content and figures.
+
+If you want to find HTML versions of the Yocto Project manuals on the web,
+go to http://www.yoctoproject.org and click on the "Documentation" tab. From
+there you have access to archived documentation from previous releases, current
+documentation for the latest release, and "Docs in Progress" for the release
+currently being developed.
+
+In general, the Yocto Project site (http://www.yoctoproject.org) is a great
+reference for both information and downloads.
+
+poky.yaml
+=========
+
+This file defines variables used for documentation production. The variables
+are used to define release pathnames, URLs for the published manuals, etc.
+
+template
+========
+Contains various templates, fonts, and some old PNG files.
+
+Sphinx
+======
+
+The Yocto Project documentation was migrated from the original DocBook
+format to Sphinx based documentation for the Yocto Project 3.2
+release. This section will provide additional information related to
+the Sphinx migration, and guidelines for developers willing to
+contribute to the Yocto Project documentation.
+
+ Sphinx is a tool that makes it easy to create intelligent and
+ beautiful documentation, written by Georg Brandl and licensed under
+ the BSD license. It was originally created for the Python
+ documentation.
+
+Extensive documentation is available on the Sphinx website:
+https://www.sphinx-doc.org/en/master/. Sphinx is designed to be
+extensible thanks to the ability to write our own custom extensions,
+as Python modules, which will be executed during the generation of the
+documentation.
+
+Yocto Project documentation website
+===================================
+
+A new website has been created to host the Yocto Project
+documentation, it can be found at: https://docs.yoctoproject.org/.
+
+The entire Yocto Project documentation, as well as the BitBake manual
+is published on this website, including all previously released
+versions. A version switcher was added, as a drop-down menu on the top
+of the page to switch back and forth between the various versions of
+the current active Yocto Project releases.
+
+Transition pages have been added (as rst file) to show links to old
+versions of the Yocto Project documentation with links to each manual
+generated with DocBook.
+
+How to build the Yocto Project documentation
+============================================
+
+Sphinx is written in Python. While it might work with Python2, for
+obvious reasons, we will only support building the Yocto Project
+documentation with Python3.
+
+Sphinx might be available in your Linux distro packages repositories,
+however it is not recommend using distro packages, as they might be
+old versions, especially if you are using an LTS version of your
+distro. The recommended method to install Sphinx and all required
+dependencies is to use the Python Package Index (pip).
+
+To install all required packages run:
+
+ $ pip3 install sphinx sphinx_rtd_theme pyyaml
+
+To build the documentation locally, run:
+
+ $ cd documentation
+ $ make html
+
+The resulting HTML index page will be _build/html/index.html, and you
+can browse your own copy of the locally generated documentation with
+your browser.
+
+Alternatively, you can use Pipenv to automatically install all required
+dependencies in a virtual environment:
+
+ $ cd documentation
+ $ pipenv install
+ $ pipenv run make html
+
+Sphinx theme and CSS customization
+==================================
+
+The Yocto Project documentation is currently based on the "Read the
+Docs" Sphinx theme, with a few changes to make sure the look and feel
+of the project documentation is preserved.
+
+Most of the theme changes can be done using the file
+'sphinx-static/theme_overrides.css'. Most CSS changes in this file
+were inherited from the DocBook CSS stylesheets.
+
+Sphinx design guidelines and principles
+=======================================
+
+The initial Docbook to Sphinx migration was done with an automated
+tool called Pandoc (https://pandoc.org/). The tool produced some clean
+output markdown text files. After the initial automated conversion
+additional changes were done to fix up headings, images and links. In
+addition Sphinx has built in mechanisms (directives) which were used
+to replace similar functions implemented in Docbook such as glossary,
+variables substitutions, notes and references.
+
+Headings
+========
+
+The layout of the Yocto Project manuals is organized as follows
+
+ Book
+ Chapter
+ Section
+ Section
+ Section
+
+The following headings styles are defined in Sphinx:
+
+ Book => overline ===
+ Chapter => overline ***
+ Section => ====
+ Section => ----
+ Section => ^^^^
+ Section => """" or ~~~~
+
+With this proposal, we preserve the same TOCs between Sphinx and Docbook.
+
+Built-in glossary
+=================
+
+Sphinx has a glossary directive. From
+https://www.sphinx-doc.org/en/master/usage/restructuredtext/directives.html#glossary:
+
+ This directive must contain a reST definition list with terms and
+ definitions. The definitions will then be referencable with the
+ [https://www.sphinx-doc.org/en/master/usage/restructuredtext/roles.html#role-term
+ 'term' role].
+
+So anywhere in any of the Yocto Project manuals, :term:`VAR` can be
+used to refer to an item from the glossary, and a link is created
+automatically. A general index of terms is also generated by Sphinx
+automatically.
+
+Global substitutions
+====================
+
+The Yocto Project documentation makes heavy use of global
+variables. In Docbook these variables are stored in the file
+poky.ent. This Docbook feature is not handled automatically with
+Pandoc. Sphinx has builtin support for substitutions
+(https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#substitutions),
+however there are important shortcomings. For example they cannot be
+used/nested inside code-block sections.
+
+A Sphinx extension was implemented to support variable substitutions
+to mimic the DocBook based documentation behavior. Variabes
+substitutions are done while reading/parsing the .rst files. The
+pattern for variables substitutions is the same as with DocBook,
+e.g. `&VAR;`.
+
+The implementation of the extension can be found here in the file
+documentation/sphinx/yocto-vars.py, this extension is enabled by
+default when building the Yocto Project documentation. All variables
+are set in a file call poky.yaml, which was initially generated from
+poky.ent. The file was converted into YAML so that it is easier to
+process by the custom Sphinx extension (which is a Python module).
+
+For example, the following .rst content will produce the 'expected'
+content:
+
+ .. code-block::
+ $ mkdir ~/poky-&DISTRO;
+ or
+ $ git clone &YOCTO_GIT_URL;/git/poky -b &DISTRO_NAME_NO_CAP;
+
+Variables can be nested, like it was the case for DocBook:
+
+ YOCTO_HOME_URL : "http://www.yoctoproject.org"
+ YOCTO_DOCS_URL : "&YOCTO_HOME_URL;/docs"
+
+Note directive
+==============
+
+Sphinx has a builtin 'note' directive that produces clean Note section
+in the output file. There are various types of directives such as
+"attention", "caution", "danger", "error", "hint", "important", "tip",
+"warning", "admonition" that are supported, and additional directive
+can be added as Sphinx extension if needed.
+
+Figures
+=======
+
+The Yocto Project documentation has many figures/images. Sphinx has a
+'figure' directive which is straight forward to use. To include a
+figure in the body of the documentation:
+
+ .. image:: figures/YP-flow-diagram.png
+
+Links and References
+====================
+
+The following types of links can be used: links to other locations in
+the same document, to locations in other documents and to external
+websites.
+
+More information can be found here:
+https://sublime-and-sphinx-guide.readthedocs.io/en/latest/references.html.
+
+References
+==========
+
+The following extension is enabed by default:
+sphinx.ext.autosectionlabel
+(https://www.sphinx-doc.org/en/master/usage/extensions/autosectionlabel.html).
+
+This extension allows you to refer sections by their titles. Note that
+autosectionlabel_prefix_document is enabled by default, so that we can
+insert references from any document.
+
+For example, to insert an HTML link to a section from
+documentaion/manual/intro.rst, use:
+
+ Please check this :ref:`manual/intro:Cross-References to Locations in the Same Document`
+
+Alternatively a custom text can be used instead of using the section
+text:
+
+ Please check this :ref:`section <manual/intro:Cross-References to Locations in the Same Document>`
+
+TIP: The following command can be used to dump all the references that
+ are defined in the project documentation:
+
+ python -msphinx.ext.intersphinx <path to build folder>/html/objects.inv
+
+This dump contains all links and for each link it shows the default
+"Link Text" that Sphinx would use. If the default link text is not
+appropriate, a custom link text can be used in the ':ref:' directive.
+
+Extlinks
+========
+
+The sphinx.ext.extlinks extension is enabled by default
+(https://sublime-and-sphinx-guide.readthedocs.io/en/latest/references.html#use-the-external-links-extension),
+and it is configured with:
+
+ 'yocto_home': ('https://yoctoproject.org%s', None),
+ 'yocto_wiki': ('https://wiki.yoctoproject.org%s', None),
+ 'yocto_dl': ('https://downloads.yoctoproject.org%s', None),
+ 'yocto_lists': ('https://lists.yoctoproject.org%s', None),
+ 'yocto_bugs': ('https://bugzilla.yoctoproject.org%s', None),
+ 'yocto_ab': ('https://autobuilder.yoctoproject.org%s', None),
+ 'yocto_docs': ('https://docs.yoctoproject.org%s', None),
+ 'yocto_git': ('https://git.yoctoproject.org%s', None),
+ 'oe_home': ('https://www.openembedded.org%s', None),
+ 'oe_lists': ('https://lists.openembedded.org%s', None),
+
+It creates convenient shortcuts which can be used throughout the
+documentation rst files, as:
+
+ Please check this :yocto_wiki:`wiki page </Weekly_Status>`
+
+Intersphinx links
+=================
+
+The sphinx.ext.intersphinx extension is enabled by default
+(https://www.sphinx-doc.org/en/master/usage/extensions/intersphinx.html),
+so that we can cross reference content from other Sphinx based
+documentation projects, such as the BitBake manual.
+
+References to the bitbake manual can be done like this:
+
+ See the ":ref:`-D <bitbake:bitbake-user-manual/bitbake-user-manual-intro:usage and syntax>`" option
+or
+ :term:`bitbake:BB_NUMBER_PARSE_THREADS`