source: BOOK/boot/common/devices.xml @ 92581b4d

clfs-1.2clfs-2.1clfs-3.0.0-systemdclfs-3.0.0-sysvinitsystemdsysvinit
Last change on this file since 92581b4d was 92581b4d, checked in by Jonathan Norman <jon@…>, 11 years ago

Reworded section about checking variable as root

  • Property mode set to 100644
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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-boot-devices">
9  <?dbhtml filename="devices.html"?>
10
11  <title>Populating /dev</title>
12
13  <indexterm zone="ch-boot-devices">
14    <primary sortas="e-/dev/*">/dev/*</primary>
15  </indexterm>
16
17  <sect2>
18    <title>Creating Initial Device Nodes</title>
19
20    <note os="a">
21      <para>The commands in the remainder of the book should be run as
22      the <systemitem class="username">root</systemitem> user. Check
23      that ${CLFS} is set in the
24      <systemitem class="username">root</systemitem> user&rsquo;s environment
25       before proceeding.</para>
26    </note>
27
28    <para os="b">When the kernel boots the system, it requires the presence
29    of a few device nodes, in particular the <filename
30    class="devicefile">console</filename> and <filename
31    class="devicefile">null</filename> devices. The device nodes will
32    be created on the hard disk so that they are available before
33    <command>udev</command> has been started, and additionally when Linux
34    is started in single user mode (hence the restrictive permissions on
35    <filename class="devicefile">console</filename>). Create these by running
36    the following commands:</para>
37
38<screen><userinput>mknod -m 600 ${CLFS}/dev/console c 5 1
39mknod -m 666 ${CLFS}/dev/null c 1 3</userinput></screen>
40
41    <para>Before udev starts a tmpfs filesystem is mounted over <filename class="directory">/dev</filename> and the previous entries are no-longer available. The folling command creates files that are copied over by the udev bootscript:</para>
42
43<screen><userinput>mknod -m 600 ${CLFS}/lib/udev/devices/console c 5 1
44mknod -m 666 ${CLFS}/lib/udev/devices/null c 1 3</userinput></screen>
45
46  </sect2>
47
48</sect1>
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