[9dfc02f] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!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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| 3 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 4 | %general-entities;
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| 5 | ]>
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[752f4e5] | 6 | <sect1 id="ch-system-devices">
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[4cfd9f0f] | 7 | <title>Populating /dev</title>
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[9dfc02f] | 8 | <?dbhtml filename="devices.html"?>
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| 9 |
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[3c928f1] | 10 | <indexterm zone="ch-system-devices"><primary sortas="e-Devices">Devices</primary></indexterm>
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[9dfc02f] | 11 |
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| 12 | <sect2>
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[ef13657] | 13 | <title>Creating Initial Device Nodes</title>
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[9dfc02f] | 14 |
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| 15 | <para>When the kernel boots the system, it requires the presence of a few device
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[3c928f1] | 16 | nodes, in particular the <filename class="devicefile">console</filename> and
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[ef13657] | 17 | <filename class="devicefile">null</filename> devices. Create these by
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| 18 | running the following commands:</para>
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[9dfc02f] | 19 |
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| 20 | <screen><userinput>mknod -m 600 /dev/console c 5 1
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| 21 | mknod -m 666 /dev/null c 1 3</userinput></screen>
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| 22 | </sect2>
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| 23 |
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| 24 | <sect2>
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[69993f4] | 25 | <title>Mounting ramfs and Populating /dev</title>
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[9dfc02f] | 26 |
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[ef13657] | 27 | <para>The ideal way to populate <filename
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[752f4e5] | 28 | class="directory">/dev</filename> is to mount a <systemitem
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| 29 | class="filesystem">ramfs</systemitem> onto <filename
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[69993f4] | 30 | class="directory">/dev</filename>, like <systemitem
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[ef13657] | 31 | class="filesystem">tmpfs</systemitem>, and create the devices on there
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| 32 | during each bootup. Since the system has not been booted, it is
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| 33 | necessary to do what the bootscripts would otherwise do and populate
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| 34 | <filename class="directory">/dev</filename>. Begin by mounting
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| 35 | <filename class="directory">/dev</filename>:</para>
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[9dfc02f] | 36 |
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| 37 | <screen><userinput>mount -n -t ramfs none /dev</userinput></screen>
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| 38 |
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[2256873] | 39 | <para>Run the installed <command>udevstart</command> program to
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[ef13657] | 40 | create the initial devices based on all the information in <filename
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| 41 | class="directory">/sys</filename>:</para>
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[9dfc02f] | 42 |
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| 43 | <screen><userinput>/tools/sbin/udevstart</userinput></screen>
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| 44 |
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[ef13657] | 45 | <para>There are some symlinks and directories required by LFS that are
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| 46 | not created by Udev, so create those here:</para>
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[9dfc02f] | 47 |
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| 48 | <screen><userinput>ln -s /proc/self/fd /dev/fd
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| 49 | ln -s /proc/self/fd/0 /dev/stdin
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| 50 | ln -s /proc/self/fd/1 /dev/stdout
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| 51 | ln -s /proc/self/fd/2 /dev/stderr
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| 52 | ln -s /proc/kcore /dev/core
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| 53 | mkdir /dev/pts
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| 54 | mkdir /dev/shm</userinput></screen>
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| 55 |
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[ef13657] | 56 | <para>Finally, mount the proper virtual (kernel) file systems on the
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| 57 | newly-created directories:</para>
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[9dfc02f] | 58 |
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| 59 | <screen><userinput>mount -t devpts -o gid=4,mode=620 none /dev/pts
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| 60 | mount -t tmpfs none /dev/shm</userinput></screen>
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[332ba21] | 61 |
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| 62 | <para>The <command>mount</command> commands executed above may result
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[8eeb6bc] | 63 | in the following warning message:</para>
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| 64 |
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[0ffc1a4] | 65 | <screen><computeroutput>can't open /etc/fstab: No such file or directory.</computeroutput></screen>
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[8eeb6bc] | 66 |
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| 67 | <para>This file—<filename>/etc/fstab</filename>—has not
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| 68 | been created yet but is also not required for the file systems to be
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| 69 | properly mounted. As such, the warning can be safely ignored.</para>
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[9dfc02f] | 70 | </sect2>
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| 71 |
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| 72 | </sect1>
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[ef13657] | 73 |
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