7.20. Populating /dev
7.20.1. Creating Initial Device Nodes
![[Note]](../images/note.png)
Note
The commands in the remainder of the book should be run as the
root user. Check that ${CLFS} is
set in the root user’s
environment before proceeding.
When the kernel boots the system, it requires the presence of a few
device nodes, in particular the console and null
devices. The device nodes will be created on the hard disk so that
they are available before udev has been started, and
additionally when Linux is started in single user mode (hence the
restrictive permissions on console).
Create these by running the following commands:
mknod -m 600 ${CLFS}/dev/console c 5 1
mknod -m 666 ${CLFS}/dev/null c 1 3
Before udev starts a tmpfs filesystem is mounted over /dev and the previous entries are no-longer
available. The folling command creates files that are copied over
by the udev bootscript:
mknod -m 600 ${CLFS}/lib/udev/devices/console c 5 1
mknod -m 666 ${CLFS}/lib/udev/devices/null c 1 3