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git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/testing/BOOK@4000 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
64 lines
2.3 KiB
XML
64 lines
2.3 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../general.ent">
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%general-entities;
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]>
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<sect1 id="ch-system-devices" xreflabel="devices">
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<title>Populating /dev</title>
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<?dbhtml filename="devices.html"?>
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<indexterm zone="ch-system-devices"><primary sortas="e-Devices">Devices</primary></indexterm>
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<sect2>
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<title>Creating Initial Device Nodes</title>
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<para>When the kernel boots the system, it requires the presence of a few device
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nodes, in particular the <filename class="devicefile">console</filename> and
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<filename class="devicefile">null</filename> devices. Create these by
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running the following commands:</para>
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<screen><userinput>mknod -m 600 /dev/console c 5 1
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mknod -m 666 /dev/null c 1 3</userinput></screen>
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</sect2>
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<sect2>
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<title>Mounting ramfs and populating /dev</title>
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<para>The ideal way to populate <filename
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class="directory">/dev</filename> is to mount a ramfs onto <filename
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class="directory">/dev</filename> like <systemitem
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class="filesystem">tmpfs</systemitem>, and create the devices on there
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during each bootup. Since the system has not been booted, it is
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necessary to do what the bootscripts would otherwise do and populate
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<filename class="directory">/dev</filename>. Begin by mounting
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<filename class="directory">/dev</filename>:</para>
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<screen><userinput>mount -n -t ramfs none /dev</userinput></screen>
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<para>Now run the installed <command>udevstart</command> program to
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create the initial devices based on all the information in <filename
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class="directory">/sys</filename>:</para>
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<screen><userinput>/tools/sbin/udevstart</userinput></screen>
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<para>There are some symlinks and directories required by LFS that are
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not created by Udev, so create those here:</para>
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<screen><userinput>ln -s /proc/self/fd /dev/fd
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ln -s /proc/self/fd/0 /dev/stdin
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ln -s /proc/self/fd/1 /dev/stdout
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ln -s /proc/self/fd/2 /dev/stderr
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ln -s /proc/kcore /dev/core
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mkdir /dev/pts
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mkdir /dev/shm</userinput></screen>
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<para>Finally, mount the proper virtual (kernel) file systems on the
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newly-created directories:</para>
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<screen><userinput>mount -t devpts -o gid=4,mode=620 none /dev/pts
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mount -t tmpfs none /dev/shm</userinput></screen>
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</sect2>
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</sect1>
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