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| -rw-r--r-- | chapter07/kernfs.xml | 45 |
1 files changed, 13 insertions, 32 deletions
diff --git a/chapter07/kernfs.xml b/chapter07/kernfs.xml index f34155d7b..8746ea1e9 100644 --- a/chapter07/kernfs.xml +++ b/chapter07/kernfs.xml @@ -24,41 +24,22 @@ <screen><userinput>mkdir -pv $LFS/{dev,proc,sys,run}</userinput></screen> - <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. The device nodes must be - created on the hard disk so that they are available before the kernel - populates <systemitem class="filesystem">/dev</systemitem>), and - additionally when Linux is started with - <parameter>init=/bin/bash</parameter>. Create the devices by running the - following commands:</para> - -<screen><userinput>mknod -m 600 $LFS/dev/console c 5 1 -mknod -m 666 $LFS/dev/null c 1 3</userinput></screen> - - </sect2> - <sect2 id="ch-tools-bindmount"> <title>Mounting and Populating /dev</title> - <para>The recommended method of populating the <filename - class="directory">/dev</filename> directory with devices is to mount a - virtual filesystem (such as <systemitem - class="filesystem">tmpfs</systemitem>) on the <filename - class="directory">/dev</filename> directory, and allow the devices to be - created dynamically on that virtual filesystem as they are detected or - accessed. Device creation is generally done during the boot process - by Udev. Since this new system does not yet have Udev and has not yet - been booted, it is necessary to mount and populate <filename - class="directory">/dev</filename> manually. This is accomplished by bind - mounting the host system's <filename class="directory">/dev</filename> - directory. A bind mount is a special type of mount that allows you to - create a mirror of a directory or mount point to some other location. Use - the following command to achieve this:</para> + <para>During a normal boot, the kernel automatically mounts the + <systemitem class="filesystem">devtmpfs</systemitem> filesystem on the + <filename class="directory">/dev</filename> directory, and allow the + devices to be created dynamically on that virtual filesystem as they + are detected or accessed. Device creation is generally done during the + boot process by Udev. Since this new system does not yet have Udev and + has not yet been booted, it is necessary to mount and populate + <filename class="directory">/dev</filename> manually. This is + accomplished by bind mounting the host system's + <filename class="directory">/dev</filename> directory. A bind mount is + a special type of mount that allows you to create a mirror of a + directory or mount point to some other location. Use the following + command to achieve this:</para> <screen><userinput>mount -v --bind /dev $LFS/dev</userinput></screen> |