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Diffstat (limited to 'chapter06/devices.xml')
| -rw-r--r-- | chapter06/devices.xml | 47 |
1 files changed, 41 insertions, 6 deletions
diff --git a/chapter06/devices.xml b/chapter06/devices.xml index 4663f4caf..e46cf8ba5 100644 --- a/chapter06/devices.xml +++ b/chapter06/devices.xml @@ -3,20 +3,42 @@ <!ENTITY % general-entities SYSTEM "../general.ent"> %general-entities; ]> -<sect1 id="ch-system-devices" xreflabel="devices"> +<sect1 id="ch-system-devices"> <title>Populating /dev</title> <?dbhtml filename="devices.html"?> -<para>Create the initial device nodes</para> +<indexterm zone="ch-system-devices"><primary sortas="e-Devices">/dev/*</primary></indexterm> + +<sect2> +<title>Creating Initial Device Nodes</title> + +<para>When the kernel boots the system, it requires the presence of a few device +nodes, in particular the <filename class="devicefile">console</filename> and +<filename class="devicefile">null</filename> devices. Create these by +running the following commands:</para> <screen><userinput>mknod -m 600 /dev/console c 5 1 mknod -m 666 /dev/null c 1 3</userinput></screen> +</sect2> + +<sect2> +<title>Mounting ramfs and Populating /dev</title> -<para>Mount a ramfs in /dev</para> +<para>The ideal way to populate <filename +class="directory">/dev</filename> is to mount a <systemitem +class="filesystem">ramfs</systemitem> onto <filename +class="directory">/dev</filename>, like <systemitem +class="filesystem">tmpfs</systemitem>, and create the devices on there +during each bootup. Since the system has not been booted, it is +necessary to do what the bootscripts would otherwise do and populate +<filename class="directory">/dev</filename>. Begin by mounting +<filename class="directory">/dev</filename>:</para> <screen><userinput>mount -n -t ramfs none /dev</userinput></screen> -<para>Create a minimal set of device nodes:</para> +<!-- Edit Me --> +<para>Since the Udev package will not be installed until later on in the +process, create a minimal set of device nodes used for building:</para> <screen><userinput>mknod -m 622 /dev/console c 5 1 mknod -m 666 /dev/null c 1 3 @@ -26,8 +48,10 @@ mknod -m 666 /dev/tty c 5 0 mknod -m 444 /dev/random c 1 8 mknod -m 444 /dev/urandom c 1 9 chown root:tty /dev/{console,ptmx,tty}</userinput></screen> +<!-- --> -<para>Create some symlinks and directories:</para> +<para>There are some symlinks and directories required by LFS that are +not created by Udev, so create those here:</para> <screen><userinput>ln -s /proc/self/fd /dev/fd ln -s /proc/self/fd/0 /dev/stdin @@ -37,10 +61,21 @@ ln -s /proc/kcore /dev/core mkdir /dev/pts mkdir /dev/shm</userinput></screen> -<para>Mount the virtual file systems:</para> +<para>Finally, mount the proper virtual (kernel) file systems on the +newly-created directories:</para> <screen><userinput>mount -t devpts -o gid=4,mode=620 none /dev/pts mount -t tmpfs none /dev/shm</userinput></screen> +<para>The <command>mount</command> commands executed above may result +in the following warning message:</para> + +<screen><computeroutput>can't open /etc/fstab: No such file or directory.</computeroutput></screen> + +<para>This file—<filename>/etc/fstab</filename>—has not +been created yet but is also not required for the file systems to be +properly mounted. As such, the warning can be safely ignored.</para> +</sect2> </sect1> + |