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+.. SPDX-License-Identifier: CC-BY-2.0-UK
+
+**********************
+Using the Standard SDK
+**********************
+
+This chapter describes the standard SDK and how to install it.
+Information includes unique installation and setup aspects for the
+standard SDK.
+
+.. note::
+
+   For a side-by-side comparison of main features supported for a
+   standard SDK as compared to an extensible SDK, see the "
+   Introduction
+   " section.
+
+You can use a standard SDK to work on Makefile and Autotools-based
+projects. See the "`Using the SDK Toolchain
+Directly <#sdk-working-projects>`__" chapter for more information.
+
+.. _sdk-standard-sdk-intro:
+
+Why use the Standard SDK and What is in It?
+===========================================
+
+The Standard SDK provides a cross-development toolchain and libraries
+tailored to the contents of a specific image. You would use the Standard
+SDK if you want a more traditional toolchain experience as compared to
+the extensible SDK, which provides an internal build system and the
+``devtool`` functionality.
+
+The installed Standard SDK consists of several files and directories.
+Basically, it contains an SDK environment setup script, some
+configuration files, and host and target root filesystems to support
+usage. You can see the directory structure in the "`Installed Standard
+SDK Directory
+Structure <#sdk-installed-standard-sdk-directory-structure>`__" section.
+
+.. _sdk-installing-the-sdk:
+
+Installing the SDK
+==================
+
+The first thing you need to do is install the SDK on your :term:`Build
+Host` by running the ``*.sh`` installation script.
+
+You can download a tarball installer, which includes the pre-built
+toolchain, the ``runqemu`` script, and support files from the
+appropriate :yocto_dl:`toolchain <releases/yocto/yocto-3.1.2/toolchain/>` directory within
+the Index of Releases. Toolchains are available for several 32-bit and
+64-bit architectures with the ``x86_64`` directories, respectively. The
+toolchains the Yocto Project provides are based off the
+``core-image-sato`` and ``core-image-minimal`` images and contain
+libraries appropriate for developing against that image.
+
+The names of the tarball installer scripts are such that a string
+representing the host system appears first in the filename and then is
+immediately followed by a string representing the target architecture.
+::
+
+   poky-glibc-host_system-image_type-arch-toolchain-release_version.sh
+
+   Where:
+       host_system is a string representing your development system:
+
+                  i686 or x86_64.
+
+       image_type is the image for which the SDK was built:
+
+                  core-image-minimal or core-image-sato.
+
+       arch is a string representing the tuned target architecture:
+
+                  aarch64, armv5e, core2-64, i586, mips32r2, mips64, ppc7400, or cortexa8hf-neon.
+
+       release_version is a string representing the release number of the Yocto Project:
+
+                  3.1.2, 3.1.2+snapshot
+
+For example, the following SDK installer is for a 64-bit
+development host system and a i586-tuned target architecture based off
+the SDK for ``core-image-sato`` and using the current DISTRO snapshot:
+::
+
+   poky-glibc-x86_64-core-image-sato-i586-toolchain-DISTRO.sh
+
+.. note::
+
+   As an alternative to downloading an SDK, you can build the SDK
+   installer. For information on building the installer, see the "
+   Building an SDK Installer
+   " section.
+
+The SDK and toolchains are self-contained and by default are installed
+into the ``poky_sdk`` folder in your home directory. You can choose to
+install the extensible SDK in any location when you run the installer.
+However, because files need to be written under that directory during
+the normal course of operation, the location you choose for installation
+must be writable for whichever users need to use the SDK.
+
+The following command shows how to run the installer given a toolchain
+tarball for a 64-bit x86 development host system and a 64-bit x86 target
+architecture. The example assumes the SDK installer is located in
+``~/Downloads/`` and has execution rights.
+
+.. note::
+
+   If you do not have write permissions for the directory into which you
+   are installing the SDK, the installer notifies you and exits. For
+   that case, set up the proper permissions in the directory and run the
+   installer again.
+
+::
+
+   $ ./Downloads/poky-glibc-x86_64-core-image-sato-i586-toolchain-3.1.2.sh
+   Poky (Yocto Project Reference Distro) SDK installer version 3.1.2
+   ===============================================================
+   Enter target directory for SDK (default: /opt/poky/3.1.2):
+   You are about to install the SDK to "/opt/poky/3.1.2". Proceed [Y/n]? Y
+   Extracting SDK........................................ ..............................done
+   Setting it up...done
+   SDK has been successfully set up and is ready to be used.
+   Each time you wish to use the SDK in a new shell session, you need to source the environment setup script e.g.
+    $ . /opt/poky/3.1.2/environment-setup-i586-poky-linux
+
+Again, reference the "`Installed Standard SDK Directory
+Structure <#sdk-installed-standard-sdk-directory-structure>`__" section
+for more details on the resulting directory structure of the installed
+SDK.
+
+.. _sdk-running-the-sdk-environment-setup-script:
+
+Running the SDK Environment Setup Script
+========================================
+
+Once you have the SDK installed, you must run the SDK environment setup
+script before you can actually use the SDK. This setup script resides in
+the directory you chose when you installed the SDK, which is either the
+default ``/opt/poky/3.1.2`` directory or the directory you chose during
+installation.
+
+Before running the script, be sure it is the one that matches the
+architecture for which you are developing. Environment setup scripts
+begin with the string "``environment-setup``" and include as part of
+their name the tuned target architecture. As an example, the following
+commands set the working directory to where the SDK was installed and
+then source the environment setup script. In this example, the setup
+script is for an IA-based target machine using i586 tuning:
+::
+
+   $ source /opt/poky/3.1.2/environment-setup-i586-poky-linux
+
+When you run the
+setup script, the same environment variables are defined as are when you
+run the setup script for an extensible SDK. See the "`Running the
+Extensible SDK Environment Setup
+Script <#sdk-running-the-extensible-sdk-environment-setup-script>`__"
+section for more information.