1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
<!ENTITY % general-entities SYSTEM "../general.ent">
%general-entities;
]>
<sect1 id="ch-system-hotplug" xreflabel="Hotplug" role="wrap">
<title>Hotplug-&hotplug-version;</title>
<?dbhtml filename="hotplug.html"?>
<indexterm zone="ch-system-hotplug"><primary sortas="a-Hotplug">Hotplug</primary></indexterm>
<sect2 role="package"><title/>
<para>The Hotplug package contains scripts that react upon hotplug events
generated by the kernel. Such events correspond to every change in the kernel
state visible in the <systemitem class="filesystem">sysfs</systemitem>
filesystem, e.g., the addition and removal of hardware. This package also
detects existing hardware during boot and inserts the relevant modules into the
running kernel.</para>
<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem><seg>0.01 SBU</seg><seg>0.1 MB</seg></seglistitem>
</segmentedlist>
<segmentedlist>
<segtitle>&dependencies;</segtitle>
<seglistitem><seg>Unchecked</seg></seglistitem>
</segmentedlist>
</sect2>
<sect2 role="installation">
<title>Installation of Hotplug</title>
<para>Install the Hotplug package:</para>
<screen><userinput>make install</userinput></screen>
<para>Copy a file that the <quote>install</quote> target omits.</para>
<screen><userinput>cp etc/hotplug/pnp.distmap /etc/hotplug</userinput></screen>
<para>Remove the init script that Hotplug installs, since we're going to be
using the script included with LFS-Bootscripts:</para>
<screen><userinput>rm -rf /etc/init.d</userinput></screen>
<para>Network device hotplugging is not supported by LFS bootscripts yet. For
that reason, remove the network hotplug agent:</para>
<screen><userinput>rm -f /etc/hotplug/net.agent</userinput></screen>
<para>For logging of hotplug events we will create a directory and a
blank file. This file will show all the information passed to hotplug:</para>
<screen><userinput>mkdir /var/log/hotplug
touch /var/log/hotplug/events</userinput></screen>
<para>For firmware to be loaded by hotplug we will create the necessary
directory:</para>
<screen><userinput>mkdir /lib/firmware</userinput></screen>
</sect2>
<sect2 id="contents-hotplug" role="content"><title>Contents of Hotplug</title>
<segmentedlist>
<segtitle>Installed program</segtitle>
<segtitle>Installed scripts</segtitle>
<segtitle>Installed files</segtitle>
<seglistitem><seg>hotplug</seg>
<seg>/etc/hotplug/*.rc, /etc/hotplug/*.agent</seg>
<seg>/etc/hotplug/hotplug.functions, /etc/hotplug/blacklist, /etc/hotplug/{pci,usb},
/etc/hotplug/usb.usermap, /etc/hotplug.d, /var/log/hotplug/events</seg></seglistitem>
</segmentedlist>
<variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead>
<?dbfo list-presentation="list"?>
<?dbhtml list-presentation="table"?>
<varlistentry id="hotplug">
<term><command>hotplug</command></term>
<listitem>
<indexterm zone="ch-system-hotplug hotplug"><primary
sortas="b-hotplug">hotplug</primary></indexterm>
<para>This script is called by default by Linux kernel when something
changes in its internal state (e.g., a new device is added or removed).</para>
</listitem>
</varlistentry>
<varlistentry id="hotplug-rc">
<term><command>/etc/hotplug/*.rc</command></term>
<listitem>
<indexterm zone="ch-system-hotplug hotplug-rc"><primary
sortas="d-/etc/hotplug/*.rc">/etc/hotplug/*.rc</primary></indexterm>
<para>These scripts are used for cold plugging, i.e., detection and other
specific actions upon hardware already present during system startup.
They are called by the <filename>hotplug</filename> initscript that comes
from the LFS-Bootscripts package.
The <command>*.rc</command>
scripts try to recover hotplug events that were lost during system boot
because, e.g., the root filesystem was not mounted by the kernel.
</para>
</listitem>
</varlistentry>
<varlistentry id="hotplug-agent">
<term><command>/etc/hotplug/*.agent</command></term>
<listitem>
<indexterm zone="ch-system-hotplug hotplug-agent"><primary
sortas="d-/etc/hotplug/*.agent">/etc/hotplug/*.agent</primary></indexterm>
<para>These scripts are called by <command>hotplug</command>
in response to different types of hotplug events generated by the kernel.
Their action is to insert corresponding kernel modules and call user-provided
scripts, if any.
</para>
</listitem>
</varlistentry>
<varlistentry id="hotplug-functions">
<term><filename>/etc/hotplug/hotplug.functions</filename></term>
<listitem>
<indexterm zone="ch-system-hotplug hotplug-functions"><primary
sortas="e-/etc/hotplug/hotplug.functions">/etc/hotplug/hotplug.functions</primary></indexterm>
<para>This file contains common functions used by other scripts in Hotplug
package.
</para>
</listitem>
</varlistentry>
<varlistentry id="hotplug-blacklist">
<term><filename>/etc/hotplug/blacklist</filename></term>
<listitem>
<indexterm zone="ch-system-hotplug hotplug-blacklist"><primary
sortas="e-/etc/hotplug/blacklist">/etc/hotplug/blacklist</primary></indexterm>
<para>This file contains the list of modules that should never be
inserted into the kernel by hotplug scripts.
</para>
</listitem>
</varlistentry>
<varlistentry id="hotplug-subdirs">
<term><filename class="directory">/etc/hotplug/{pci,usb}</filename></term>
<listitem>
<indexterm zone="ch-system-hotplug hotplug-subdirs"><primary
sortas="e-/etc/hotplug/{pci,usb}">/etc/hotplug/{pci,usb}</primary></indexterm>
<para>These directories are supposed to contain user-written handlers for
hotplug events.
</para>
</listitem>
</varlistentry>
<varlistentry id="hotplug-usb.usermap">
<term><filename>/etc/hotplug/usb.usermap</filename></term>
<listitem>
<indexterm zone="ch-system-hotplug hotplug-usb.usermap"><primary
sortas="e-/etc/hotplug/usb.usermap">/etc/hotplug/usb.usermap</primary></indexterm>
<para>This file contains rules that determine which user-defined handlers to
call for each USB device, based on its vendor, id and other attributes.
</para>
</listitem>
</varlistentry>
<varlistentry id="hotplug-events">
<term><filename>/var/log/hotplug/events</filename></term>
<listitem>
<indexterm zone="ch-system-hotplug hotplug-events"><primary
sortas="e-/var/log/hotplug/events">/var/log/hotplug/events</primary></indexterm>
<para>This file contains all the events since bootup that hotplug has called.
</para>
</listitem>
</varlistentry>
<varlistentry id="hotplug-hotplug.d">
<term><filename class="directory">/etc/hotplug.d</filename></term>
<listitem>
<indexterm zone="ch-system-hotplug hotplug-hotplug.d"><primary
sortas="e-/etc/hotplug.d">/etc/hotplug.d</primary></indexterm>
<para>This directory contains programs (or symlinks to them)
that are interested in receiving hotplug events. E.g.,
<application>Udev</application> puts its symlink here during installation.
</para>
</listitem>
</varlistentry>
<varlistentry id="hotplug-firmware">
<term><filename class="directory">/lib/firmware</filename></term>
<listitem>
<indexterm zone="ch-system-hotplug hotplug-firmware"><primary
sortas="e-/lib/firmware">/lib/firmware</primary></indexterm>
<para>This directory contains the firmware for devices that
need to have there firmware loaded before use.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>
</sect1>
|
