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+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
+[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
+
+<chapter id='sdk-intro'>
+<title>Introduction</title>
+
+<section id='sdk-manual-intro'>
+    <title>Introduction</title>
+
+    <para>
+        Welcome to the Yocto Project Software Development Kit (SDK)
+        Developer's Guide.
+        This manual provides information that lets you use both the standard
+        Yocto Project SDK and an extensible SDK to develop applications and
+        images using the Yocto Project.
+        Additionally, the manual also provides information on how to use
+        the popular <trademark class='trade'>Eclipse</trademark> IDE as part
+        of your application development workflow.
+    </para>
+
+    <para>
+        Prior to the 2.0 Release of the Yocto Project, application
+        development was primarily accomplished through the use of the
+        Application Development Toolkit (ADT) and the availability
+        of stand-alone cross-development toolchains and other tools.
+        With the 2.1 Release of the Yocto Project, application development
+        has transitioned to within a more traditional SDK and extensible
+        SDK.
+    </para>
+
+    <para>
+        A standard SDK consists of a cross-development toolchain that contains
+        a compiler, debugger, and various miscellaneous tools; libraries,
+        headers, and symbols to match an image; and environment setup script.
+        You can use this SDK to independently develop and test code that is
+        destined to run on some target machine.
+    </para>
+
+    <para>
+        An extensible SDK consists of everything that the standard SDK has plus
+        tools that allow you to easily add new applications and libraries to
+        an image, modify the source of an existing component, test changes on
+        the target hardware, and easily integrate an application into the
+        <ulink url='&YOCTO_DOCS_DEV_URL;#build-system-term'>OpenEmbedded build system</ulink>.
+    </para>
+
+    <para>
+        SDKs are completely self-contained.
+        The binaries are linked against their own copy of
+        <filename>libc</filename>, which results in no dependencies
+        on the target system.
+        To achieve this, the pointer to the dynamic loader is
+        configured at install time since that path cannot be dynamically
+        altered.
+        This is the reason for a wrapper around the
+        <filename>populate_sdk</filename> and
+        <filename>populate_sdk_ext</filename> archives.
+    </para>
+
+    <para>
+        Another feature for the SDKs is that only one set of cross-canadian
+        toolchain binaries are produced per architecture.
+        This feature takes advantage of the fact that the target hardware can
+        be passed to <filename>gcc</filename> as a set of compiler options.
+        Those options are set up by the environment script and contained in
+        variables such as
+        <ulink url='&YOCTO_DOCS_REF_URL;#var-CC'><filename>CC</filename></ulink>
+        and
+        <ulink url='&YOCTO_DOCS_REF_URL;#var-LD'><filename>LD</filename></ulink>.
+        This reduces the space needed for the tools.
+        Understand, however, that a sysroot is still needed for every target
+        since those binaries are target-specific.
+    </para>
+
+    <para>
+        Going beyond the actual SDK, the SDK development environment consists
+        of the following:
+        <itemizedlist>
+            <listitem><para>An architecture-specific cross-toolchain and
+                matching sysroots (target and native) all built by the
+                OpenEmbedded build system.
+                The toolchain and sysroots are based on a
+                <ulink url='&YOCTO_DOCS_DEV_URL;#metadata'>Metadata</ulink>
+                configuration and extensions,
+                which allows you to cross-develop on the host machine for the
+                target hardware.
+                </para></listitem>
+            <listitem><para>The Quick EMUlator (QEMU), which lets you simulate
+                target hardware.
+                QEMU is not literally part of the SDK.
+                You must build and include this emulator separately.
+                However, QEMU plays an important role in the development
+                process that revolves around use of and SDK.
+                </para></listitem>
+            <listitem><para>The Eclipse IDE Yocto Plug-in.
+                This plug-in is also available for you if you are an Eclipse
+                user.
+                In the same manner as QEMU, the plug-in is not literally part
+                of the SDK but is rather available for use as part of the
+                development process.
+                </para></listitem>
+            <listitem><para>Various user-space tools that greatly enhance
+                your application development experience.
+                These tools are also separate from the actual SDK but can be
+                independently obtained and used in the development process.
+                </para></listitem>
+        </itemizedlist>
+    </para>
+
+    <section id='the-cross-development-toolchain'>
+        <title>The Cross-Development Toolchain</title>
+
+        <para>
+            The
+            <ulink url='&YOCTO_DOCS_DEV_URL;#cross-development-toolchain'>Cross-Development Toolchain</ulink>
+            consists of a cross-compiler, cross-linker, and cross-debugger
+            that are used to develop user-space applications for targeted
+            hardware.
+            This toolchain is created by running a toolchain installer script
+            or through a
+            <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>
+            that is based on your Metadata configuration or extension for
+            your targeted device.
+            The cross-toolchain works with a matching target sysroot.
+        </para>
+    </section>
+
+    <section id='sysroot'>
+        <title>Sysroots</title>
+
+        <para>
+            The native and target sysroots contain needed headers and libraries
+            for generating binaries that run on the target architecture.
+            The target sysroot is based on the target root filesystem image
+            that is built by the OpenEmbedded build system and uses the same
+            Metadata configuration used to build the cross-toolchain.
+        </para>
+    </section>
+
+    <section id='the-qemu-emulator'>
+        <title>The QEMU Emulator</title>
+
+        <para>
+            The QEMU emulator allows you to simulate your hardware while
+            running your application or image.
+            QEMU is not part of the SDK but is made available a number of ways:
+            <itemizedlist>
+                <listitem><para>
+                    If you have cloned the <filename>poky</filename> Git
+                    repository to create a
+                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>
+                    and you have sourced the environment setup script, QEMU is
+                    installed and automatically available.
+                    </para></listitem>
+                <listitem><para>
+                    If you have downloaded a Yocto Project release and unpacked
+                    it to create a
+                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>
+                    and you have sourced the environment setup script, QEMU is
+                    installed and automatically available.
+                    </para></listitem>
+                <listitem><para>
+                    If you have installed the cross-toolchain tarball and you
+                    have sourced the toolchain's setup environment script, QEMU
+                    is also installed and automatically available.
+                    </para></listitem>
+            </itemizedlist>
+        </para>
+    </section>
+
+    <section id='eclipse-overview'>
+        <title>Eclipse Yocto Plug-in</title>
+
+        <para>
+            The Eclipse IDE is a popular development environment and it fully
+            supports development using the Yocto Project.
+            When you install and configure the Eclipse Yocto Project Plug-in
+            into the Eclipse IDE, you maximize your Yocto Project experience.
+            Installing and configuring the Plug-in results in an environment
+            that has extensions specifically designed to let you more easily
+            develop software.
+            These extensions allow for cross-compilation, deployment, and
+            execution of your output into a QEMU emulation session.
+            You can also perform cross-debugging and profiling.
+            The environment also supports a suite of tools that allows you to
+            perform remote profiling, tracing, collection of power data,
+            collection of latency data, and collection of performance data.
+        </para>
+
+        <para>
+            For information about the application development workflow that
+            uses the Eclipse IDE and for a detailed example of how to install
+            and configure the Eclipse Yocto Project Plug-in, see the
+            "<link link='sdk-developing-applications-using-eclipse'>Developing Applications Using <trademark class='trade'>Eclipse</trademark></link>"
+            section.
+        </para>
+    </section>
+
+    <section id='user-space-tools'>
+        <title>User-Space Tools</title>
+
+        <para>
+            User-space tools are available as part of the SDK development
+            process and can be helpful.
+            The tools include LatencyTOP, PowerTOP, Perf, SystemTap,
+            and Lttng-ust.
+            These tools are common development tools for the Linux platform.
+            <itemizedlist>
+                <listitem><para><emphasis>LatencyTOP:</emphasis> LatencyTOP
+                    focuses on latency that causes skips in audio, stutters in
+                    your desktop experience, or situations that overload your
+                    server even when you have plenty of CPU power left.
+                    </para></listitem>
+                <listitem><para><emphasis>PowerTOP:</emphasis> Helps you
+                    determine what software is using the most power.
+                    You can find out more about PowerTOP at
+                    <ulink url='https://01.org/powertop/'></ulink>.</para></listitem>
+                <listitem><para><emphasis>Perf:</emphasis> Performance counters
+                    for Linux used to keep track of certain types of hardware
+                    and software events.
+                    For more information on these types of counters see
+                    <ulink url='https://perf.wiki.kernel.org/'></ulink>.
+                    For examples on how to setup and use this tool, see the
+                    "<ulink url='&YOCTO_DOCS_PROF_URL;#profile-manual-perf'>perf</ulink>"
+                    section in the Yocto Project Profiling and Tracing Manual.
+                    </para></listitem>
+                <listitem><para><emphasis>SystemTap:</emphasis> A free software
+                    infrastructure that simplifies information gathering about
+                    a running Linux system.
+                    This information helps you diagnose performance or
+                    functional problems.
+                    SystemTap is not available as a user-space tool through
+                    the Eclipse IDE Yocto Plug-in.
+                    See <ulink url='http://sourceware.org/systemtap'></ulink>
+                    for more information on SystemTap.
+                    For examples on how to setup and use this tool, see the
+                    "<ulink url='&YOCTO_DOCS_PROF_URL;#profile-manual-systemtap'>SystemTap</ulink>"
+                    section in the Yocto Project Profiling and Tracing Manual.
+                    </para></listitem>
+                <listitem><para><emphasis>Lttng-ust:</emphasis> A User-space
+                    Tracer designed to provide detailed information on
+                    user-space activity.
+                    See <ulink url='http://lttng.org/ust'></ulink> for more
+                    information on Lttng-ust.
+                    </para></listitem>
+            </itemizedlist>
+        </para>
+    </section>
+</section>
+
+<section id='sdk-development-model'>
+    <title>SDK Development Model</title>
+
+    <para>
+        Fundamentally, the SDK fits into the development process as follows:
+        <imagedata fileref="figures/sdk-environment.png" align="center" width="6in" depth="5in" scalefit="100" />
+        The SDK is installed on any machine and can be used to develop
+        applications, images, and kernels.
+        An SDK can even be used by a QA Engineer or Release Engineer.
+        The fundamental concept is that the machine that has the SDK installed
+        does not have to be associated with the machine that has the
+        Yocto Project installed.
+        A developer can independently compile and test an object on their
+        machine and then, when the object is ready for integration into an
+        image, they can simply make it available to the machine that has the
+        the Yocto Project.
+        Once the object is available, the image can be rebuilt using the
+        Yocto Project to produce the modified image.
+    </para>
+
+    <para>
+        You just need to follow these general steps:
+        <orderedlist>
+            <listitem><para><emphasis>Install the SDK for your target hardware:</emphasis>
+                For information on how to install the SDK, see the
+                "<link url='sdk-installing-the-sdk'>Installing the SDK</link>"
+                section.</para></listitem>
+            <listitem><para><emphasis>Download the Target Image:</emphasis>
+                The Yocto Project supports several target architectures
+                and has many pre-built kernel images and root filesystem
+                images.</para>
+                <para>If you are going to develop your application on
+                hardware, go to the
+                <ulink url='&YOCTO_MACHINES_DL_URL;'><filename>machines</filename></ulink>
+                download area and choose a target machine area
+                from which to download the kernel image and root filesystem.
+                This download area could have several files in it that
+                support development using actual hardware.
+                For example, the area might contain
+                <filename>.hddimg</filename> files that combine the
+                kernel image with the filesystem, boot loaders, and
+                so forth.
+                Be sure to get the files you need for your particular
+                development process.</para>
+                <para>If you are going to develop your application and
+                then run and test it using the QEMU emulator, go to the
+                <ulink url='&YOCTO_QEMU_DL_URL;'><filename>machines/qemu</filename></ulink>
+                download area.
+                From this area, go down into the directory for your
+                target architecture (e.g. <filename>qemux86_64</filename>
+                for an <trademark class='registered'>Intel</trademark>-based
+                64-bit architecture).
+                Download kernel, root filesystem, and any other files you
+                need for your process.
+                <note>In order to use the root filesystem in QEMU, you
+                need to extract it.
+                See the
+                "<link url='sdk-extracting-the-root-filesystem'>Extracting the Root Filesystem</link>"
+                section for information on how to extract the root
+                filesystem.</note></para></listitem>
+            <listitem><para><emphasis>Develop and Test your
+                Application:</emphasis>  At this point, you have the tools
+                to develop your application.
+                If you need to separately install and use the QEMU
+                emulator, you can go to
+                <ulink url='http://wiki.qemu.org/Main_Page'>QEMU Home Page</ulink>
+                to download and learn about the emulator.
+                You can see the
+                "<ulink url='&YOCTO_DOCS_DEV_URL;#dev-manual-qemu'>Using the Quick EMUlator (QEMU)</ulink>"
+                chapter in the Yocto Project Development Manual
+                for information on using QEMU within the Yocto
+                Project.</para></listitem>
+        </orderedlist>
+    </para>
+
+    <para>
+        The remainder of this manual describes how to use both the standard
+        SDK and the extensible SDK.
+        Information also exists in appendix form that describes how you can
+        build, install, and modify an SDK.
+    </para>
+</section>
+
+</chapter>
+<!--
+vim: expandtab tw=80 ts=4
+-->