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