source: chapter06/kernel.xml@ f58cbc1

xry111/clfs-ng
Last change on this file since f58cbc1 was f58cbc1, checked in by Xi Ruoyao <xry111@…>, 10 months ago

cross-ng: chapter 6: build temporary Linux kernel

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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-tools-kernel" role="wrap">
9 <?dbhtml filename="kernel.html"?>
10
11 <sect1info condition="script">
12 <productname>kernel</productname>
13 <productnumber>&linux-version;</productnumber>
14 <address>&linux-url;</address>
15 </sect1info>
16
17 <title>Linux-&linux-version;</title>
18
19 <indexterm zone="ch-tools-kernel">
20 <primary sortas="a-Linux">Linux</primary>
21 <secondary>tools</secondary>
22 </indexterm>
23
24 <sect2 role="package">
25 <title/>
26
27 <para>The Linux package contains the Linux kernel.</para>
28
29 <segmentedlist>
30 <segtitle>&buildtime;</segtitle>
31 <segtitle>&diskspace;</segtitle>
32
33 <seglistitem>
34 <seg>&linux-tmp-sbu;</seg>
35 <seg>&linux-tmp-du;</seg>
36 </seglistitem>
37 </segmentedlist>
38
39 </sect2>
40
41 <sect2 role="installation">
42 <title>Installation of the kernel</title>
43
44 <para>Building the kernel involves a few steps&mdash;configuration,
45 compilation, and installation. Read the <filename>README</filename> file
46 in the kernel source tree for alternative methods to the way this book
47 configures the kernel.</para>
48
49 <para>Prepare for compilation by running the following command:</para>
50
51<screen><userinput remap="pre">make mrproper</userinput></screen>
52
53 <para>This ensures that the kernel tree is absolutely clean. The
54 kernel team recommends that this command be issued prior to each
55 kernel compilation. Do not rely on the source tree being clean after
56 un-tarring.</para>
57
58 <para>There are several ways to configure the kernel options. Usually,
59 This is done through a menu-driven interface, for example:</para>
60
61<screen role="nodump"><userinput>make ARCH=x86 CROSS_COMPILE=$LFS_TGT- menuconfig</userinput></screen>
62
63 <variablelist>
64 <title>The meaning of make environment variables:</title>
65
66 <varlistentry>
67 <term><command>ARCH=x86</command></term>
68 <listitem>
69 <para>Configure the kernel for running on the target machine.</para>
70 </listitem>
71 </varlistentry>
72
73 <varlistentry>
74 <term><command>CROSS_COMPILE=$LFS_TGT-</command></term>
75 <listitem>
76 <para>Build the kernel with Binutils and GCC built in
77 <xref linkend='chapter-cross-tools'/>.</para>
78 </listitem>
79 </varlistentry>
80
81 <varlistentry>
82 <term><command>menuconfig</command></term>
83 <listitem>
84 <para>This launches an ncurses menu-driven interface. For other
85 (graphical) interfaces, type <command>make help</command>.</para>
86 </listitem>
87 </varlistentry>
88
89 <varlistentry>
90 <term>(optional) <parameter>LANG=&lt;host_LANG_value&gt; LC_ALL=</parameter></term>
91 <listitem>
92 <para>This establishes the locale setting to the one used on the
93 host. This may be needed for a proper menuconfig ncurses interface
94 line drawing on a UTF-8 linux text console.</para>
95
96 <para>If used, be sure to replace
97 <replaceable>&lt;host_LANG_value&gt;</replaceable> by the value of
98 the <envar>$LANG</envar> variable from your host. You can
99 alternatively use instead the host's value of <envar>$LC_ALL</envar>
100 or <envar>$LC_CTYPE</envar>.</para>
101 </listitem>
102 </varlistentry>
103
104 </variablelist>
105
106 <note>
107
108 <para>A good starting place for setting up the kernel configuration is to
109 run <command>make ARCH=x86 CROSS_COMPILE=$LFS_TGT- defconfig</command>. This will set the base
110 configuration to a good state that takes your target system architecture
111 into account.</para>
112
113 </note>
114
115 <para>Read <xref linkend='ch-bootable-kernel'/> for more information
116 about kernel configuration. You should enable or disable some kernel
117 configuration options now:</para>
118
119 <variablelist>
120 <title>Kernel configuration options and explanation:</title>
121
122 <varlistentry>
123 <term>Set <parameter>CONFIG_MODULES=n</parameter></term>
124 <listitem>
125 <para>Modular kernel needs <command>modprobe</command> tool from
126 <application>Kmod</application> to load modules, which is not
127 installed in the temporary system.</para>
128 </listitem>
129 </varlistentry>
130
131 <varlistentry>
132 <term>Enable <parameter>CONFIG_EXT2</parameter>,
133 <parameter>CONFIG_EXT4</parameter>,
134 and <parameter>CONFIG_VFAT_FS</parameter></term>
135 <listitem>
136 <para>They are needed to access the filesystems we'll make for the
137 target system.</para>
138 </listitem>
139 </varlistentry>
140 </variablelist>
141
142 <para>Compile the kernel image:</para>
143
144<screen><userinput remap="make">make ARCH=x86 CROSS_COMPILE=$LFS_TGT-</userinput></screen>
145
146 <para>Install the kernel image into the
147 <filename class="directory">$LFS/boot</filename> directory:</para>
148
149 <screen><userinput remap="install">install -vm644 arch/x86/boot/bzImage $LFS/boot/vmlinuz</userinput></screen>
150
151 </sect2>
152
153 <sect2 role="content">
154 <title/>
155
156 <para>Details on this package are located in
157 <xref linkend="contents-kernel" role="."/></para>
158
159 </sect2>
160
161</sect1>
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