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2"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" 2"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
3[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] > 3[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
4 4
5<chapter id='kernel-doc-intro'> 5<chapter id='kernel-dev-intro'>
6 6
7<title>Yocto Project Kernel Architecture and Use Manual</title> 7<title>Yocto Project Kernel Development Manual</title>
8 8
9<section id='kernel-intro-section'> 9<section id='kernel-dev-introduction'>
10 <title>Introduction</title> 10 <title>Introduction</title>
11
11 <para> 12 <para>
12 The Yocto Project presents kernels as a fully patched, history-clean Git 13 Regardless of how you intend to make use of the Yocto Project, chances are you
13 repositories. 14are going to need to work with the Linux kernel. The Yocto Project provides a
14 Each repository represents selected features, board support, 15powerful set of tools for managing Linux kernel sources and configuration data.
15 and configurations extensively tested by the Yocto Project. 16If you want to make a single configuration change, apply a couple of patches, or
16 Yocto Project kernels allow the end user to leverage community 17work with your own sources, the Yocto Project has tooling in place to help you
17 best practices to seamlessly manage the development, build and debug cycles. 18do it.
18 </para> 19 </para>
20
19 <para> 21 <para>
20 This manual describes Yocto Project kernels by providing information 22 Each Yocto Project release introduces a new set of linux-yocto kernel recipes,
21 on history, organization, benefits, and use. 23tracking the latest upstream developments and introducing newly supported
22 The manual consists of two sections: 24platforms. In addition to the new kernel recipes, the previous recipes are
23 <itemizedlist> 25refreshed and supported for at least one additional release. As they align,
24 <listitem><para><emphasis>Concepts:</emphasis> Describes concepts behind a kernel. 26these previous releases are updated to include the latest from the LTSI project.
25 You will understand how a kernel is organized and why it is organized in 27Besides these recipes, a linux-yocto-dev recipe is available for working with
26 the way it is. You will understand the benefits of a kernel's organization 28the very latest in upstream Linux kernel development as well as meta-data
27 and the mechanisms used to work with the kernel and how to apply it in your 29development.
28 design process.</para></listitem>
29 <listitem><para><emphasis>Using a Kernel:</emphasis> Describes best practices
30 and "how-to" information
31 that lets you put a kernel to practical use.
32 Some examples are how to examine changes in a branch and how to
33 save kernel modifications.</para></listitem>
34 </itemizedlist>
35 </para> 30 </para>
36 31
37 <para> 32 <para>
38 For more information on the Linux kernel, see the following links: 33 If you do not maintain your own kernel sources and need to make only minimal
39 <itemizedlist> 34changes to the sources, these recipes provide a vetted base upon which to layer
40 <listitem><para>The Linux Foundation's guide for kernel development 35your changes. Doing so allows you to benefit from the continual kernel
41 process - <ulink url='http://www.linuxfoundation.org/content/1-guide-kernel-development-process'></ulink></para></listitem> 36integration and testing performed during development of the Yocto Project.
42 <listitem><para>A fairly encompassing guide on Linux kernel development -
43 <ulink url='http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob_plain;f=Documentation/HOWTO;hb=HEAD'></ulink></para></listitem>
44 </itemizedlist>
45 </para> 37 </para>
46 38
47 <para> 39 <para>
48 For more discussion on the Yocto Project kernel, you can see these sections 40 If, instead, you have a very specific Linux kernel source tree and are unable to
49 in the Yocto Project Development Manual: 41align with one of the many official linux-yocto releases, an alternative
42exists by which you can use the Yocto Project Linux kernel tools with your own
43sources.
44 </para>
45
46 <para>
47 The sections that follow provide instructions for completing specific Linux
48kernel development tasks. They assume familiarity with working with bitbake
49recipes and basic open-source development tools. Understanding these concepts
50will facilitate the process of working with the kernel recipes. If you find you
51need some additional background, please be sure to review and understand the
52following documentation:
50 <itemizedlist> 53 <itemizedlist>
51 <listitem><para> 54 <listitem><para><emphasis>Yocto Project Quick Start</emphasis>
52 "<ulink url='&YOCTO_DOCS_DEV_URL;#kernel-overview'>Kernel Overview</ulink>"</para></listitem>
53 <listitem><para>
54 "<ulink url='&YOCTO_DOCS_DEV_URL;#kernel-modification-workflow'>Kernel Modification Workflow</ulink>"
55 </para></listitem> 55 </para></listitem>
56 <listitem><para> 56 <listitem><para><emphasis>Yocto Project Development Manual</emphasis>
57 "<ulink url='&YOCTO_DOCS_DEV_URL;#patching-the-kernel'>Patching the Kernel</ulink>"</para></listitem> 57 <itemizedlist>
58 <listitem><para> 58 <listitem><para><emphasis>4.3 Modifying Temporary Source Code</emphasis>
59 "<ulink url='&YOCTO_DOCS_DEV_URL;#configuring-the-kernel'>Configuring the Kernel</ulink>"</para></listitem> 59 </para></listitem>
60 <listitem><para><emphasis>5.1 Understanding and Creating Layers</emphasis>
61 </para></listitem>
62 <listitem><para><emphasis>4.1.2 Modifying the Kernel</emphasis>
63 (This section should be retired, as well as 5.6, 5.7 - with this document
64 providing the necessary information)</para></listitem>
65 </itemizedlist></para></listitem>
60 </itemizedlist> 66 </itemizedlist>
61 </para> 67 </para>
62 68
63 <para> 69 <para>
64 For general information on the Yocto Project, visit the website at 70 Finally, while this document focuses on the manual creation of recipes, patches,
65 <ulink url='&YOCTO_HOME_URL;'></ulink>. 71and configuration files, the Yocto Project BSP tools are available to automate
72this process with existing content and work well to create the initial framework
73and boilerplate code. For details, refer to the Yocto Project BSP Developer's
74Guide.
66 </para> 75 </para>
67</section> 76</section>
68 77
69
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75</chapter> 78</chapter>
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