| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="ch-bootable-kernel" role="wrap">
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| 9 | <?dbhtml filename="kernel.html"?>
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| 10 |
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| 11 | <sect1info condition="script">
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| 12 | <productname>kernel</productname>
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| 13 | <productnumber>&linux-version;</productnumber>
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| 14 | <address>&linux-url;</address>
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| 15 | </sect1info>
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| 16 |
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| 17 | <title>Linux-&linux-version;</title>
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| 18 |
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| 19 | <indexterm zone="ch-bootable-kernel">
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| 20 | <primary sortas="a-Linux">Linux</primary>
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| 21 | </indexterm>
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| 22 |
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| 23 | <sect2 role="package">
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| 24 | <title/>
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| 25 |
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| 26 | <para>The Linux package contains the Linux kernel.</para>
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| 27 |
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| 28 | <segmentedlist>
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| 29 | <segtitle>&buildtime;</segtitle>
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| 30 | <segtitle>&diskspace;</segtitle>
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| 31 |
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| 32 | <seglistitem>
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| 33 | <seg>&linux-knl-sbu;</seg>
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| 34 | <seg>&linux-knl-du;</seg>
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| 35 | </seglistitem>
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| 36 | </segmentedlist>
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| 37 |
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| 38 | </sect2>
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| 39 |
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| 40 | <sect2 role="installation">
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| 41 | <title>Installation of the kernel</title>
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| 42 |
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| 43 | <para>Building the kernel involves a few steps—configuration,
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| 44 | compilation, and installation. Read the <filename>README</filename> file
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| 45 | in the kernel source tree for alternative methods to the way this book
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| 46 | configures the kernel.</para>
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| 47 |
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| 48 | <para>Prepare for compilation by running the following command:</para>
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| 49 |
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| 50 | <screen><userinput remap="pre">make mrproper</userinput></screen>
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| 51 |
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| 52 | <para>This ensures that the kernel tree is absolutely clean. The
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| 53 | kernel team recommends that this command be issued prior to each
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| 54 | kernel compilation. Do not rely on the source tree being clean after
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| 55 | un-tarring.</para>
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| 56 |
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| 57 | <para>There are several ways to configure the kernel options. Usually,
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| 58 | This is done through a menu-driven interface, for example:</para>
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| 59 |
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| 60 | <screen role="nodump"><userinput>make menuconfig</userinput></screen>
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| 61 |
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| 62 | <variablelist>
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| 63 | <title>The meaning of optional make environment variables:</title>
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| 64 |
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| 65 | <varlistentry>
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| 66 | <term><parameter>LANG=<host_LANG_value> LC_ALL=</parameter></term>
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| 67 | <listitem>
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| 68 | <para>This establishes the locale setting to the one used on the
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| 69 | host. This may be needed for a proper menuconfig ncurses interface
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| 70 | line drawing on a UTF-8 linux text console.</para>
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| 71 |
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| 72 | <para>If used, be sure to replace
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| 73 | <replaceable><host_LANG_value></replaceable> by the value of
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| 74 | the <envar>$LANG</envar> variable from your host. You can
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| 75 | alternatively use instead the host's value of <envar>$LC_ALL</envar>
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| 76 | or <envar>$LC_CTYPE</envar>.</para>
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| 77 | </listitem>
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| 78 | </varlistentry>
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| 79 |
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| 80 | <varlistentry>
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| 81 | <term><command>make menuconfig</command></term>
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| 82 | <listitem>
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| 83 | <para>This launches an ncurses menu-driven interface. For other
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| 84 | (graphical) interfaces, type <command>make help</command>.</para>
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| 85 | </listitem>
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| 86 | </varlistentry>
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| 87 | </variablelist>
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| 88 |
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| 89 | <!-- Support for compiling a keymap into the kernel is deliberately removed -->
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| 90 |
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| 91 | <para>For general information on kernel configuration see <ulink
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| 92 | url="&hints-root;kernel-configuration.txt"/>. BLFS has some information
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| 93 | regarding particular kernel configuration requirements of packages outside
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| 94 | of LFS at <ulink
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| 95 | url="&blfs-book;longindex.html#kernel-config-index"/>. Additional
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| 96 | information about configuring and building the kernel can be found at
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| 97 | <ulink url="http://www.kroah.com/lkn/"/> </para>
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| 98 |
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| 99 | <note>
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| 100 | <para>A good starting place for setting up the kernel configuration is to
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| 101 | run <command>make defconfig</command>. This will set the base
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| 102 | configuration to a good state that takes your current system architecture
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| 103 | into account.</para>
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| 104 |
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| 105 | <para>Be sure to enable/disable/set the following features or the system might
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| 106 | not work correctly or boot at all:</para>
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| 107 |
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| 108 | <screen role="nodump" revision="sysv">General setup -->
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| 109 | < > Enable kernel headers through /sys/kernel/kheaders.tar.xz [CONFIG_IKHEADERS]
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| 110 | Device Drivers --->
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| 111 | Graphics support --->
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| 112 | Frame buffer Devices --->
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| 113 | [*] Support for frame buffer devices ----
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| 114 | Generic Driver Options --->
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| 115 | [ ] Support for uevent helper [CONFIG_UEVENT_HELPER]
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| 116 | [*] Maintain a devtmpfs filesystem to mount at /dev [CONFIG_DEVTMPFS]
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| 117 | [*] Automount devtmpfs at /dev, after the kernel mounted the rootfs [CONFIG_DEVTMPFS_MOUNT]</screen>
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| 118 |
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| 119 | <screen role="nodump" revision="systemd">General setup -->
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| 120 | [ ] Auditing Support [CONFIG_AUDIT]
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| 121 | CPU/Task time and stats accounting --->
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| 122 | [*] Pressure stall information tracking [CONFIG_PSI]
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| 123 | < > Enable kernel headers through /sys/kernel/kheaders.tar.xz [CONFIG_IKHEADERS]
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| 124 | [*] Control Group support [CONFIG_CGROUPS] --->
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| 125 | [*] Memory controller [CONFIG_MEMCG]
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| 126 | [ ] Enable deprecated sysfs features to support old userspace tools [CONFIG_SYSFS_DEPRECATED]
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| 127 | [*] Configure standard kernel features (expert users) [CONFIG_EXPERT] --->
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| 128 | [*] open by fhandle syscalls [CONFIG_FHANDLE]
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| 129 | General architecture-dependent options --->
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| 130 | [*] Enable seccomp to safely compute untrusted bytecode [CONFIG_SECCOMP]
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| 131 | Networking support --->
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| 132 | Networking options --->
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| 133 | <*> The IPv6 protocol [CONFIG_IPV6]
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| 134 | Device Drivers --->
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| 135 | Generic Driver Options --->
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| 136 | [ ] Support for uevent helper [CONFIG_UEVENT_HELPER]
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| 137 | [*] Maintain a devtmpfs filesystem to mount at /dev [CONFIG_DEVTMPFS]
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| 138 | [*] Automount devtmpfs at /dev, after the kernel mounted the rootfs [CONFIG_DEVTMPFS_MOUNT]
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| 139 | Firmware Loader --->
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| 140 | [ ] Enable the firmware sysfs fallback mechanism [CONFIG_FW_LOADER_USER_HELPER]
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| 141 | Firmware Drivers --->
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| 142 | [*] Export DMI identification via sysfs to userspace [CONFIG_DMIID]
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| 143 | Graphics support --->
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| 144 | Frame buffer Devices --->
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| 145 | <*> Support for frame buffer devices --->
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| 146 | File systems --->
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| 147 | [*] Inotify support for userspace [CONFIG_INOTIFY_USER]
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| 148 | Pseudo filesystems --->
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| 149 | [*] Tmpfs POSIX Access Control Lists [CONFIG_TMPFS_POSIX_ACL]</screen>
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| 150 | </note>
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| 151 |
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| 152 | <note revision="systemd">
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| 153 | <para>While "The IPv6 Protocol" is not strictly
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| 154 | required, it is highly recommended by the systemd developers.</para>
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| 155 | </note>
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| 156 |
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| 157 | <para revision="sysv">There are several other options that may be desired
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| 158 | depending on the requirements for the system. For a list of options needed
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| 159 | for BLFS packages, see the <ulink
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| 160 | url="&lfs-root;blfs/view/&short-version;/longindex.html#kernel-config-index">BLFS
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| 161 | Index of Kernel Settings</ulink>
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| 162 | (&lfs-root;blfs/view/&short-version;/longindex.html#kernel-config-index).</para>
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| 163 |
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| 164 | <note>
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| 165 | <para>If your host hardware is using UEFI and you wish to boot the
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| 166 | LFS system with it, you should adjust some kernel configuration
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| 167 | following <ulink url="&blfs-book;postlfs/grub-setup.html#uefi-kernel">
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| 168 | the BLFS page</ulink>.</para>
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| 169 | </note>
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| 170 |
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| 171 | <variablelist>
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| 172 | <title>The rationale for the above configuration items:</title>
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| 173 |
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| 174 | <varlistentry>
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| 175 | <term>
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| 176 | <parameter>
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| 177 | Enable kernel headers through /sys/kernel/kheaders.tar.xz
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| 178 | </parameter>
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| 179 | </term>
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| 180 | <listitem>
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| 181 | <para>This will require <command>cpio</command> building the kernel.
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| 182 | <command>cpio</command> is not installed by LFS.</para>
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| 183 | </listitem>
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| 184 | </varlistentry>
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| 185 |
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| 186 | <varlistentry>
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| 187 | <term><parameter>Support for uevent helper</parameter></term>
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| 188 | <listitem>
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| 189 | <para>Having this option set may interfere with device
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| 190 | management when using Udev/Eudev. </para>
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| 191 | </listitem>
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| 192 | </varlistentry>
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| 193 |
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| 194 | <varlistentry>
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| 195 | <term><parameter>Maintain a devtmpfs</parameter></term>
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| 196 | <listitem>
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| 197 | <para>This will create automated device nodes which are populated by the
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| 198 | kernel, even without Udev running. Udev then runs on top of this,
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| 199 | managing permissions and adding symlinks. This configuration
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| 200 | item is required for all users of Udev/Eudev.</para>
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| 201 | </listitem>
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| 202 | </varlistentry>
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| 203 |
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| 204 | <varlistentry>
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| 205 | <term><parameter>Automount devtmpfs at /dev</parameter></term>
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| 206 | <listitem>
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| 207 | <para>This will mount the kernel view of the devices on /dev
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| 208 | upon switching to root filesystem just before starting
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| 209 | init.</para>
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| 210 | </listitem>
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| 211 | </varlistentry>
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| 212 |
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| 213 | </variablelist>
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| 214 |
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| 215 | <para>Alternatively, <command>make oldconfig</command> may be more
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| 216 | appropriate in some situations. See the <filename>README</filename>
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| 217 | file for more information.</para>
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| 218 |
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| 219 | <para>If desired, skip kernel configuration by copying the kernel
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| 220 | config file, <filename>.config</filename>, from the host system
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| 221 | (assuming it is available) to the unpacked <filename
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| 222 | class="directory">linux-&linux-version;</filename> directory. However,
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| 223 | we do not recommend this option. It is often better to explore all the
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| 224 | configuration menus and create the kernel configuration from
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| 225 | scratch.</para>
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| 226 |
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| 227 | <para>Compile the kernel image and modules:</para>
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| 228 |
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| 229 | <screen><userinput remap="make">make</userinput></screen>
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| 230 |
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| 231 | <para>If using kernel modules, module configuration in <filename
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| 232 | class="directory">/etc/modprobe.d</filename> may be required.
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| 233 | Information pertaining to modules and kernel configuration is
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| 234 | located in <xref linkend="ch-config-udev"/> and in the kernel
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| 235 | documentation in the <filename
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| 236 | class="directory">linux-&linux-version;/Documentation</filename> directory.
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| 237 | Also, <filename>modprobe.d(5)</filename> may be of interest.</para>
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| 238 |
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| 239 | <para>Unless module support has been disabled in the kernel configuration,
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| 240 | install the modules with:</para>
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| 241 |
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| 242 | <screen><userinput remap="install">make modules_install</userinput></screen>
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| 243 |
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| 244 | <para>After kernel compilation is complete, additional steps are
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| 245 | required to complete the installation. Some files need to be copied to
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| 246 | the <filename class="directory">/boot</filename> directory.</para>
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| 247 |
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| 248 | <caution>
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| 249 | <para>As the cross-built LFS system has a separate /boot partition,
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| 250 | the files copied below should go there. The easiest way to do that is
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| 251 | to mount <filename class="directory">/boot</filename> before
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| 252 | proceeding. As the root user:</para>
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| 253 |
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| 254 | <screen role="nodump"><userinput>mount /boot</userinput></screen>
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| 255 |
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| 256 | <para>We don't need to specify the path to the device node, as it's
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| 257 | already given in <filename>/etc/fstab</filename>.</para>
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| 258 | </caution>
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| 259 |
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| 260 | <para>The path to the kernel image may vary depending on the platform being
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| 261 | used. The filename below can be changed to suit your taste, but the stem of
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| 262 | the filename should be <emphasis>vmlinuz</emphasis> to be compatible with
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| 263 | the automatic setup of the boot process described in the next section. The
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| 264 | following command assumes an x86 architecture:</para>
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| 265 |
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| 266 | <screen><userinput remap="install">cp -iv arch/x86/boot/bzImage /boot/vmlinuz-&linux-version;-lfs-&version;</userinput></screen>
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| 267 |
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| 268 | <para><filename>System.map</filename> is a symbol file for the kernel.
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| 269 | It maps the function entry points of every function in the kernel API,
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| 270 | as well as the addresses of the kernel data structures for the running
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| 271 | kernel. It is used as a resource when investigating kernel problems.
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| 272 | Issue the following command to install the map file:</para>
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| 273 |
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| 274 | <screen><userinput remap="install">cp -iv System.map /boot/System.map-&linux-version;</userinput></screen>
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| 275 |
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| 276 | <para>The kernel configuration file <filename>.config</filename>
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| 277 | produced by the <command>make menuconfig</command> step
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| 278 | above contains all the configuration selections for the kernel
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| 279 | that was just compiled. It is a good idea to keep this file for future
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| 280 | reference:</para>
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| 281 |
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| 282 | <screen><userinput remap="install">cp -iv .config /boot/config-&linux-version;</userinput></screen>
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| 283 |
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| 284 | <para>Install the documentation for the Linux kernel:</para>
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| 285 |
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| 286 | <screen><userinput remap="install">install -d /usr/share/doc/linux-&linux-version;
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| 287 | cp -r Documentation/* /usr/share/doc/linux-&linux-version;</userinput></screen>
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| 288 |
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| 289 | <para>It is important to note that the files in the kernel source
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| 290 | directory are not owned by <emphasis>root</emphasis>. Whenever a
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| 291 | package is unpacked as user <emphasis>root</emphasis> (like we did
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| 292 | inside chroot), the files have the user and group IDs of whatever
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| 293 | they were on the packager's computer. This is usually not a problem
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| 294 | for any other package to be installed because the source tree is
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| 295 | removed after the installation. However, the Linux source tree is
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| 296 | often retained for a long time. Because of this, there is a chance
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| 297 | that whatever user ID the packager used will be assigned to somebody
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| 298 | on the machine. That person would then have write access to the kernel
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| 299 | source.</para>
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| 300 |
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| 301 | <note>
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| 302 | <para>In many cases, the configuration of the kernel will need to be
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| 303 | updated for packages that will be installed later in BLFS. Unlike
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| 304 | other packages, it is not necessary to remove the kernel source tree
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| 305 | after the newly built kernel is installed.</para>
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| 306 |
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| 307 | <para>If the kernel source tree is going to be retained, run
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| 308 | <command>chown -R 0:0</command> on the <filename
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| 309 | class="directory">linux-&linux-version;</filename> directory to ensure
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| 310 | all files are owned by user <emphasis>root</emphasis>.</para>
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| 311 | </note>
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| 312 |
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| 313 | <warning>
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| 314 | <para>Some kernel documentation recommends creating a symlink from
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| 315 | <filename class="symlink">/usr/src/linux</filename> pointing to the kernel
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| 316 | source directory. This is specific to kernels prior to the 2.6 series and
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| 317 | <emphasis>must not</emphasis> be created on an LFS system as it can cause
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| 318 | problems for packages you may wish to build once your base LFS system is
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| 319 | complete.</para>
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| 320 | </warning>
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| 321 |
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| 322 | <warning>
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| 323 | <para>The headers in the system's <filename
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| 324 | class="directory">include</filename> directory (<filename
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| 325 | class="directory">/usr/include</filename>) should
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| 326 | <emphasis>always</emphasis> be the ones against which Glibc was compiled,
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| 327 | that is, the sanitised headers installed in <xref
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| 328 | linkend="ch-tools-linux-headers"/>. Therefore, they should
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| 329 | <emphasis>never</emphasis> be replaced by either the raw kernel headers
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| 330 | or any other kernel sanitized headers.</para>
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| 331 | </warning>
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| 332 |
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| 333 | </sect2>
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| 334 |
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| 335 | <sect2 id="conf-modprobe" role="configuration">
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| 336 | <title>Configuring Linux Module Load Order</title>
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| 337 |
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| 338 | <indexterm zone="conf-modprobe">
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| 339 | <primary sortas="e-/etc/modprobe.d/usb.conf">/etc/modprobe.d/usb.conf</primary>
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| 340 | </indexterm>
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| 341 |
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| 342 | <para>Most of the time Linux modules are loaded automatically, but
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| 343 | sometimes it needs some specific direction. The program that loads
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| 344 | modules, <command>modprobe</command> or <command>insmod</command>, uses
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| 345 | <filename>/etc/modprobe.d/usb.conf</filename> for this purpose. This file
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| 346 | needs to be created so that if the USB drivers (ehci_hcd, ohci_hcd and
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| 347 | uhci_hcd) have been built as modules, they will be loaded in the correct
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| 348 | order; ehci_hcd needs to be loaded prior to ohci_hcd and uhci_hcd in order
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| 349 | to avoid a warning being output at boot time.</para>
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| 350 |
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| 351 | <para>Create a new file <filename>/etc/modprobe.d/usb.conf</filename> by running
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| 352 | the following:</para>
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| 353 |
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| 354 | <screen><userinput>install -v -m755 -d /etc/modprobe.d
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| 355 | cat > /etc/modprobe.d/usb.conf << "EOF"
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| 356 | <literal># Begin /etc/modprobe.d/usb.conf
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| 357 |
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| 358 | install ohci_hcd /sbin/modprobe ehci_hcd ; /sbin/modprobe -i ohci_hcd ; true
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| 359 | install uhci_hcd /sbin/modprobe ehci_hcd ; /sbin/modprobe -i uhci_hcd ; true
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| 360 |
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| 361 | # End /etc/modprobe.d/usb.conf</literal>
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| 362 | EOF</userinput></screen>
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| 363 |
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| 364 | </sect2>
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| 365 |
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| 366 | <sect2 id="contents-kernel" role="content">
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| 367 | <title>Contents of Linux</title>
|
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| 368 |
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| 369 | <segmentedlist>
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| 370 | <segtitle>Installed files</segtitle>
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| 371 | <segtitle>Installed directories</segtitle>
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| 372 |
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| 373 | <seglistitem>
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| 374 | <seg>config-&linux-version;,
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| 375 | vmlinuz-&linux-version;-lfs-&version;,
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| 376 | and System.map-&linux-version;</seg>
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| 377 | <seg>/lib/modules, /usr/share/doc/linux-&linux-version;</seg>
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| 378 | </seglistitem>
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| 379 | </segmentedlist>
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| 380 |
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| 381 | <variablelist>
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| 382 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 383 | <?dbfo list-presentation="list"?>
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| 384 | <?dbhtml list-presentation="table"?>
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| 385 |
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| 386 | <varlistentry id="config">
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| 387 | <term><filename>config-&linux-version;</filename></term>
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| 388 | <listitem>
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| 389 | <para>Contains all the configuration selections for the kernel</para>
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| 390 | <indexterm zone="ch-bootable-kernel config">
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| 391 | <primary sortas="e-/boot/config">/boot/config-&linux-version;</primary>
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| 392 | </indexterm>
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| 393 | </listitem>
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| 394 | </varlistentry>
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| 395 |
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| 396 | <varlistentry id="lfskernel">
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| 397 | <term><filename>vmlinuz-&linux-version;-lfs-&version;</filename></term>
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| 398 | <listitem>
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| 399 | <para>The engine of the Linux system. When turning on the computer,
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| 400 | the kernel is the first part of the operating system that gets loaded.
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| 401 | It detects and initializes all components of the computer's hardware,
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| 402 | then makes these components available as a tree of files to the
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| 403 | software and turns a single CPU into a multitasking machine capable
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| 404 | of running scores of programs seemingly at the same time</para>
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| 405 | <indexterm zone="ch-bootable-kernel lfskernel">
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| 406 | <primary sortas="b-lfskernel">lfskernel-&linux-version;</primary>
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| 407 | </indexterm>
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| 408 | </listitem>
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| 409 | </varlistentry>
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| 410 |
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| 411 | <varlistentry id="System.map">
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| 412 | <term><filename>System.map-&linux-version;</filename></term>
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| 413 | <listitem>
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| 414 | <para>A list of addresses and symbols; it maps the entry points and
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| 415 | addresses of all the functions and data structures in the
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| 416 | kernel</para>
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| 417 | <indexterm zone="ch-bootable-kernel System.map">
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| 418 | <primary sortas="e-/boot/System.map">/boot/System.map-&linux-version;</primary>
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| 419 | </indexterm>
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| 420 | </listitem>
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| 421 | </varlistentry>
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| 422 |
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| 423 | </variablelist>
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| 424 |
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| 425 | </sect2>
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| 426 |
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| 427 | </sect1>
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