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1<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
3[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
5<chapter id='adt-intro'>
6 <title>The Application Development Toolkit (ADT)</title>
8 <para>
9 Part of the Yocto Project development solution is an Application Development
10 Toolkit (ADT).
11 The ADT provides you with a custom-built, cross-development
12 platform suited for developing a user-targeted product application.
13 </para>
15 <para>
16 Fundamentally, the ADT consists of the following:
17 <itemizedlist>
18 <listitem><para>An architecture-specific cross-toolchain and matching
19 sysroot both built by the OpenEmbedded build system.
20 The toolchain and sysroot are based on a
21 <ulink url='&YOCTO_DOCS_DEV_URL;#metadata'>Metadata</ulink>
22 configuration and extensions,
23 which allows you to cross-develop on the host machine for the target hardware.
24 </para></listitem>
25 <listitem><para>The Eclipse IDE Yocto Plug-in.</para></listitem>
26 <listitem><para>The Quick EMUlator (QEMU), which lets you simulate target hardware.
27 </para></listitem>
28 <listitem><para>Various user-space tools that greatly enhance your application
29 development experience.</para></listitem>
30 </itemizedlist>
31 </para>
33 <section id='the-cross-development-toolchain'>
34 <title>The Cross-Development Toolchain</title>
36 <para>
37 The
38 <ulink url='&YOCTO_DOCS_DEV_URL;#cross-development-toolchain'>Cross-Development Toolchain</ulink>
39 consists of a cross-compiler, cross-linker, and cross-debugger
40 that are used to develop user-space applications for targeted
41 hardware.
42 This toolchain is created either by running the ADT Installer
43 script, a toolchain installer script, or through a
44 <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>
45 that is based on your Metadata configuration or extension for
46 your targeted device.
47 The cross-toolchain works with a matching target sysroot.
48 </para>
49 </section>
51 <section id='sysroot'>
52 <title>Sysroot</title>
54 <para>
55 The matching target sysroot contains needed headers and libraries for generating
56 binaries that run on the target architecture.
57 The sysroot is based on the target root filesystem image that is built by
58 the OpenEmbedded build system and uses the same Metadata configuration
59 used to build the cross-toolchain.
60 </para>
61 </section>
63 <section id='eclipse-overview'>
64 <title>Eclipse Yocto Plug-in</title>
66 <para>
67 The Eclipse IDE is a popular development environment and it fully supports
68 development using the Yocto Project.
69 When you install and configure the Eclipse Yocto Project Plug-in into
70 the Eclipse IDE, you maximize your Yocto Project experience.
71 Installing and configuring the Plug-in results in an environment that
72 has extensions specifically designed to let you more easily develop software.
73 These extensions allow for cross-compilation, deployment, and execution of
74 your output into a QEMU emulation session.
75 You can also perform cross-debugging and profiling.
76 The environment also supports a suite of tools that allows you to perform
77 remote profiling, tracing, collection of power data, collection of
78 latency data, and collection of performance data.
79 </para>
81 <para>
82 For information about the application development workflow that uses the Eclipse
83 IDE and for a detailed example of how to install and configure the Eclipse
84 Yocto Project Plug-in, see the
85 "<ulink url='&YOCTO_DOCS_DEV_URL;#adt-eclipse'>Working Within Eclipse</ulink>" section
86 of the Yocto Project Development Manual.
87 </para>
88 </section>
90 <section id='the-qemu-emulator'>
91 <title>The QEMU Emulator</title>
93 <para>
94 The QEMU emulator allows you to simulate your hardware while running your
95 application or image.
96 QEMU is made available a number of ways:
97 <itemizedlist>
98 <listitem><para>
99 If you use the ADT Installer script to install ADT, you can
100 specify whether or not to install QEMU.
101 </para></listitem>
102 <listitem><para>
103 If you have cloned the <filename>poky</filename> Git
104 repository to create a
105 <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>
106 and you have sourced the environment setup script, QEMU is
107 installed and automatically available.
108 </para></listitem>
109 <listitem><para>
110 If you have downloaded a Yocto Project release and unpacked
111 it to create a
112 <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>
113 and you have sourced the environment setup script, QEMU is
114 installed and automatically available.
115 </para></listitem>
116 <listitem><para>
117 If you have installed the cross-toolchain tarball and you
118 have sourced the toolchain's setup environment script, QEMU
119 is also installed and automatically available.
120 </para></listitem>
121 </itemizedlist>
122 </para>
123 </section>
125 <section id='user-space-tools'>
126 <title>User-Space Tools</title>
128 <para>
129 User-space tools are included as part of the distribution.
130 You will find these tools helpful during development.
131 The tools include LatencyTOP, PowerTOP, OProfile, Perf, SystemTap, and Lttng-ust.
132 These tools are common development tools for the Linux platform.
133 <itemizedlist>
134 <listitem><para><emphasis>LatencyTOP:</emphasis> LatencyTOP focuses on latency
135 that causes skips in audio,
136 stutters in your desktop experience, or situations that overload your server
137 even when you have plenty of CPU power left.
138 </para></listitem>
139 <listitem><para><emphasis>PowerTOP:</emphasis> Helps you determine what
140 software is using the most power.
141 You can find out more about PowerTOP at
142 <ulink url=''></ulink>.</para></listitem>
143 <listitem><para><emphasis>OProfile:</emphasis> A system-wide profiler for Linux
144 systems that is capable of profiling all running code at low overhead.
145 You can find out more about OProfile at
146 <ulink url=''></ulink>.
147 For examples on how to setup and use this tool, see the
148 "<ulink url='&YOCTO_DOCS_PROF_URL;#profile-manual-oprofile'>OProfile</ulink>"
149 section in the Yocto Project Profiling and Tracing Manual.
150 </para></listitem>
151 <listitem><para><emphasis>Perf:</emphasis> Performance counters for Linux used
152 to keep track of certain types of hardware and software events.
153 For more information on these types of counters see
154 <ulink url=''></ulink>.
155 For examples on how to setup and use this tool, see the
156 "<ulink url='&YOCTO_DOCS_PROF_URL;#profile-manual-perf'>perf</ulink>"
157 section in the Yocto Project Profiling and Tracing Manual.
158 </para></listitem>
159 <listitem><para><emphasis>SystemTap:</emphasis> A free software infrastructure
160 that simplifies information gathering about a running Linux system.
161 This information helps you diagnose performance or functional problems.
162 SystemTap is not available as a user-space tool through the Eclipse IDE Yocto Plug-in.
163 See <ulink url=''></ulink> for more information
164 on SystemTap.
165 For examples on how to setup and use this tool, see the
166 "<ulink url='&YOCTO_DOCS_PROF_URL;#profile-manual-systemtap'>SystemTap</ulink>"
167 section in the Yocto Project Profiling and Tracing Manual.</para></listitem>
168 <listitem><para><emphasis>Lttng-ust:</emphasis> A User-space Tracer designed to
169 provide detailed information on user-space activity.
170 See <ulink url=''></ulink> for more information on Lttng-ust.
171 </para></listitem>
172 </itemizedlist>
173 </para>
174 </section>
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