[PATCH 04/10] user: Add "Obtain the Sources" section

[Sebastian Huber]

---
 user/start/index.rst   |  1 +
 user/start/sources.rst | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 user/start/sources.rst

diff --git a/user/start/index.rst b/user/start/index.rst
index 96388f2..d5f21e7 100644
--- a/user/start/index.rst
+++ b/user/start/index.rst
@@ -18,6 +18,7 @@ applications on top of RTEMS.
 
     host
     prefixes
+    sources
 
 The following is a quick start guide that provides a basic set of commands to
 build the RTEMS Tools and Kernel. The quick start guide provides links to the
diff --git a/user/start/sources.rst b/user/start/sources.rst
new file mode 100644
index 0000000..6fee109
--- /dev/null
+++ b/user/start/sources.rst
@@ -0,0 +1,51 @@
+.. SPDX-License-Identifier: CC-BY-SA-4.0
+
+.. Copyright (C) 2019 embedded brains GmbH
+.. Copyright (C) 2019 Sebastian Huber
+
+.. _QuickStartSources:
+
+Obtain the Sources
+==================
+
+You chose an installation prefix previous section.  We chose
+:file:`$HOME/quick-start/rtems/5` as the installation prefix.
+
+You need at least two source archives or Git repositories to work with RTEMS.
+You can download the source archives for a released RTEMS version or you can
+clone Git repositories to get all versions of RTEMS including the development
+head.
+
+We will clone the Git repositories into :file:`$HOME/quick-start/src`.
+
+.. code-block:: none
+
+    mkdir -p $HOME/quick-start/src
+    cd $HOME/quick-start/src
+    git clone https://github.com/RTEMS/rtems-source-builder.git rsb
+    git clone https://github.com/RTEMS/rtems.git
+
+The :file:`rsb` repository clone contains the
+:ref:`RTEMS Source Builder (RSB) <RSB>`.  We clone it into
+:file:`rsb` to get shorter paths during the tool suite build.  The
+:file:`rtems` repository clone contains the RTEMS sources.  These two
+repositories are enough to get started.  There are
+`more repositories <https://git.rtems.org>`_ available.
+
+Alternatively, you can download the source archives of a released RTEMS
+version.
+
+.. code-block:: none
+
+    mkdir -p $HOME/quick-start/src
+    cd $HOME/quick-start/src
+    curl https://ftp.rtems.org/pub/rtems/releases/4.11/4.11.3/rtems-4.11.3.tar.xz | tar xJf -
+    curl https://ftp.rtems.org/pub/rtems/releases/4.11/4.11.3/rtems-source-builder-4.11.3.tar.xz | tar xJf -
+
+This quick start chapter focuses on working with the Git repository clones
+since this gives you some flexibility.  You can switch between branches to try
+out different RTEMS versions.  You have access to the RTEMS source history.
+The RTEMS Project welcomes contributions.  The Git repositories enable you to
+easily create patches and track local changes.  If you prefer to work with
+archives of a released RTEMS version, then simply replace the version number 5
+used throughout this chapter with the version number you selected, e.g. 4.11.
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2.16.4