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1<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
2"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
3[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >
4<!--SPDX-License-Identifier: CC-BY-2.0-UK-->
5
6<appendix id='kernel-dev-faq'>
7<title>Kernel Development FAQ</title>
8
9<section id='kernel-dev-faq-section'>
10 <title>Common Questions and Solutions</title>
11
12 <para>
13 The following lists some solutions for common questions.
14
15
16 <qandaset>
17 <qandaentry>
18 <question>
19 <para>
20 How do I use my own Linux kernel <filename>.config</filename>
21 file?
22 </para>
23 </question>
24 <answer>
25 <para>
26 Refer to the "<link linkend='changing-the-configuration'>Changing the Configuration</link>"
27 section for information.
28 </para>
29 </answer>
30 </qandaentry>
31
32 <qandaentry>
33 <question>
34 <para>
35 How do I create configuration fragments?
36 </para>
37 </question>
38 <answer>
39 <para>
40 Refer to the
41 "<link linkend='creating-config-fragments'>Creating Configuration Fragments</link>"
42 section for information.
43 </para>
44 </answer>
45 </qandaentry>
46
47 <qandaentry>
48 <question>
49 <para>
50 How do I use my own Linux kernel sources?
51 </para>
52 </question>
53 <answer>
54 <para>
55 Refer to the "<link linkend='working-with-your-own-sources'>Working With Your Own Sources</link>"
56 section for information.
57 </para>
58 </answer>
59 </qandaentry>
60
61 <qandaentry>
62 <question>
63 <para>
64 How do I install/not-install the kernel image on the rootfs?
65 </para>
66 </question>
67 <answer>
68 <para>
69 The kernel image (e.g. <filename>vmlinuz</filename>) is provided
70 by the <filename>kernel-image</filename> package.
71 Image recipes depend on <filename>kernel-base</filename>.
72 To specify whether or not the kernel
73 image is installed in the generated root filesystem, override
74 <filename>RDEPENDS_kernel-base</filename> to include or not
75 include "kernel-image".</para>
76 <para>See the
77 "<ulink url='&YOCTO_DOCS_DEV_URL;#using-bbappend-files'>Using .bbappend Files in Your Layer</ulink>"
78 section in the Yocto Project Development Tasks Manual
79 for information on how to use an append file to
80 override metadata.
81 </para>
82 </answer>
83 </qandaentry>
84
85 <qandaentry>
86 <question>
87 <para>
88 How do I install a specific kernel module?
89 </para>
90 </question>
91 <answer>
92 <para>
93 Linux kernel modules are packaged individually.
94 To ensure a specific kernel module is included in an image,
95 include it in the appropriate machine
96 <ulink url='&YOCTO_DOCS_REF_URL;#var-RRECOMMENDS'><filename>RRECOMMENDS</filename></ulink>
97 variable.</para>
98 <para>These other variables are useful for installing specific
99 modules:
100 <literallayout class='monospaced'>
101 <ulink url='&YOCTO_DOCS_REF_URL;#var-MACHINE_ESSENTIAL_EXTRA_RDEPENDS'><filename>MACHINE_ESSENTIAL_EXTRA_RDEPENDS</filename></ulink>
102 <ulink url='&YOCTO_DOCS_REF_URL;#var-MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS'><filename>MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS</filename></ulink>
103 <ulink url='&YOCTO_DOCS_REF_URL;#var-MACHINE_EXTRA_RDEPENDS'><filename>MACHINE_EXTRA_RDEPENDS</filename></ulink>
104 <ulink url='&YOCTO_DOCS_REF_URL;#var-MACHINE_EXTRA_RRECOMMENDS'><filename>MACHINE_EXTRA_RRECOMMENDS</filename></ulink>
105 </literallayout>
106 For example, set the following in the <filename>qemux86.conf</filename>
107 file to include the <filename>ab123</filename> kernel modules
108 with images built for the <filename>qemux86</filename> machine:
109 <literallayout class='monospaced'>
110 MACHINE_EXTRA_RRECOMMENDS += "kernel-module-ab123"
111 </literallayout>
112 For more information, see the
113 "<link linkend='incorporating-out-of-tree-modules'>Incorporating Out-of-Tree Modules</link>"
114 section.
115 </para>
116 </answer>
117 </qandaentry>
118
119 <qandaentry>
120 <question>
121 <para>
122 How do I change the Linux kernel command line?
123 </para>
124 </question>
125 <answer>
126 <para>
127 The Linux kernel command line is typically specified in
128 the machine config using the <filename>APPEND</filename> variable.
129 For example, you can add some helpful debug information doing
130 the following:
131 <literallayout class='monospaced'>
132 APPEND += "printk.time=y initcall_debug debug"
133 </literallayout>
134 </para>
135 </answer>
136 </qandaentry>
137 </qandaset>
138 </para>
139</section>
140</appendix>
141<!--
142vim: expandtab tw=80 ts=4
143-->
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