[9dfc02f] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[1fe35e1] | 2 | <!DOCTYPE section [
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[9dfc02f] | 3 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 4 | %general-entities;
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| 5 | ]>
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[1fe35e1] | 6 | <section xmlns="http://docbook.org/docbook-ng"
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| 7 | xml:id="ch-system-devices" xreflabel="devices">
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[6a0e6f3] | 8 | <title>Populating /dev</title>
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[9dfc02f] | 9 | <?dbhtml filename="devices.html"?>
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| 10 |
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[3c928f1] | 11 | <indexterm zone="ch-system-devices"><primary sortas="e-Devices">Devices</primary></indexterm>
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[9dfc02f] | 12 |
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[1fe35e1] | 13 | <section>
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[6a0e6f3] | 14 | <title>Creating initial device nodes</title>
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[9dfc02f] | 15 |
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| 16 | <para>When the kernel boots the system, it requires the presence of a few device
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[3c928f1] | 17 | nodes, in particular the <filename class="devicefile">console</filename> and
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| 18 | <filename class="devicefile">null</filename> devices:</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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[1fe35e1] | 22 | </section>
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[9dfc02f] | 23 |
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[1fe35e1] | 24 | <section>
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[6a0e6f3] | 25 | <title>Mounting ramfs and populating /dev</title>
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[9dfc02f] | 26 |
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[3c928f1] | 27 | <para>The ideal way to populate <filename class="directory">/dev</filename> is
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| 28 | to mount a <systemitem class="filesystem">ramfs</systemitem> onto <filename class="directory">/dev </filename>
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| 29 | like <systemitem class="filesystem">tmpfs</systemitem>, but it
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[9dfc02f] | 30 | cannot be swapped) and create the devices on there during each bootup. Since we haven't
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| 31 | booted the system, we have to do what the bootscripts would otherwise do for us, and
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[3c928f1] | 32 | populate <filename class="directory">/dev</filename> ourselves. Begin by mounting <filename class="directory">/dev</filename>:</para>
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[9dfc02f] | 33 |
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| 34 | <screen><userinput>mount -n -t ramfs none /dev</userinput></screen>
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| 35 |
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[6135b95] | 36 | <para>Since we do not have the Udev package installed yet, we'll create a
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| 37 | minimal set of device nodes to use for building:</para>
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[9dfc02f] | 38 |
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[0a9b2e0] | 39 | <screen><userinput>mknod -m 622 /dev/console c 5 1
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| 40 | mknod -m 666 /dev/null c 1 3
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| 41 | mknod -m 666 /dev/zero c 1 5
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| 42 | mknod -m 666 /dev/ptmx c 5 2
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[84dee3b4] | 43 | mknod -m 666 /dev/tty c 5 0
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| 44 | mknod -m 444 /dev/random c 1 8
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| 45 | mknod -m 444 /dev/urandom c 1 9
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| 46 | chown root:tty /dev/{console,ptmx,tty}</userinput></screen>
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[9dfc02f] | 47 |
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| 48 | <para>There are some symlinks and directories required by LFS that are not created by
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| 49 | Udev, so we create those ourselves here:</para>
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| 50 |
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| 51 | <screen><userinput>ln -s /proc/self/fd /dev/fd
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| 52 | ln -s /proc/self/fd/0 /dev/stdin
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| 53 | ln -s /proc/self/fd/1 /dev/stdout
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| 54 | ln -s /proc/self/fd/2 /dev/stderr
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| 55 | ln -s /proc/kcore /dev/core
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| 56 | mkdir /dev/pts
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| 57 | mkdir /dev/shm</userinput></screen>
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| 58 |
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| 59 | <para>Finally, mount the proper virtual (kernel) file systems on the directories we just
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| 60 | created:</para>
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| 61 |
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| 62 | <screen><userinput>mount -t devpts -o gid=4,mode=620 none /dev/pts
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| 63 | mount -t tmpfs none /dev/shm</userinput></screen>
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[1fe35e1] | 64 | </section>
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[9dfc02f] | 65 |
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| 66 |
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[1fe35e1] | 67 | </section>
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