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80 lines
2.6 KiB
Plaintext
80 lines
2.6 KiB
Plaintext
HOWTO use udev to manage /dev
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This document describes one way to get udev working on a Fedora-development
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machine to manage /dev. This procedure may be used to get udev to manage
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/dev on other distros, if you modify some of the steps.
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This will only work if you use a 2.6 based kernel, preferably the most
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recent one. This does not prevent your machine from using a 2.4
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kernel, if you boot into one, udev will not run and your old /dev will
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be present with no changes needed.
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NOTE NOTE NOTE NOTE NOTE NOTE NOTE
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This is completely unsupported. Attempting to do this may cause your
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machine to be unable to boot properly. USE AT YOUR OWN RISK. Always
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have a rescue disk or CD handy to allow you to fix up any errors that
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may occur.
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NOTE NOTE NOTE NOTE NOTE NOTE NOTE
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- Build and install udev as specified in the README that comes with
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udev. I recommend using the following build options to get the
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smallest possible binaries:
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make USE_KLIBC=true USE_LOG=false DEBUG=false
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- disable udev from the boot process by running:
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chkconfig udev off
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or
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chkconfig --del udev
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as root.
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- place the start_udev script somewhere that is accessible by your
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initscripts. I placed it into /etc/rc.d with the following command:
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copy extras/start_udev /etc/rc.d/
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- modify the rc.sysinit script to call the start_udev script as one of
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the first things that it does, but after /proc and /sys are mounted.
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I did this with the latest Fedora startup scripts with the patch at
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the end of this file.
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- make sure the /etc/udev/udev.conf file lists the udev_root as "/dev/"
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and the udev_db as "/dev/.udev.tdb". It should contain the
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following lines in order to work properly.
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udev_root="/dev/"
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udev_db="/dev/.udev.tdb"
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- reboot into a 2.6 kernel and watch udev create all of the initial
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device nodes in /dev
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If anyone has any problems with this, please let me, and the
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linux-hotplug-devel@lists.sourceforge.net mailing list know.
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A big thanks go out to the Gentoo developers for showing me that this is
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possible to do.
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Greg Kroah-Hartman
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<greg@kroah.com>
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----------------------------------
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Patch to modify rc.sysinit to call udev at the beginning of the boot
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process:
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--- /etc/rc.sysinit.orig 2004-02-17 11:45:17.000000000 -0800
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+++ /etc/rc.sysinit 2004-02-17 13:28:33.000000000 -0800
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@@ -32,6 +32,9 @@
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. /etc/init.d/functions
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+# start udev to populate /dev
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+/etc/rc.d/start_udev
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+
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if [ "$HOSTTYPE" != "s390" -a "$HOSTTYPE" != "s390x" ]; then
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last=0
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for i in `LC_ALL=C grep '^[0-9].*respawn:/sbin/mingetty' /etc/inittab | sed 's/^.* tty\([0-9][0-9]*\).*/\1/g'`; do
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