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update README

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Kay Sievers 2006-08-07 03:13:27 +02:00
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README
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@ -6,31 +6,29 @@ Important Note:
Integrating udev in the system is a whole lot of work, has complex dependencies
and differs a lot from distro to distro. All major distros depend on udev these
days and the system may not work without a proper installed version. The upstream
udev project does not support or recomend to replace a distro's udev installation
udev project does not support or recommend to replace a distro's udev installation
with the upstream version. The installation of a unmodified upstream version may
render your system unusable. Until now, there is no "default" setup or a set of
"default" rules provided by the upstream udev version.
Requirements:
- 2.6.x version of the Linux kernel. See the RELEASE-NOTES file in the
udev tree and the Documentation/Changes in the kernel source tree for
the actual dependency.
- Version 2.6.15 of the Linux kernel for reliable operation of this release of
udev. The kernel may have a requirement on udev too, see Documentation/Changes
in the kernel source tree for the actual dependency.
- The kernel must have sysfs and unix domain socket enabled.
- The kernel must have sysfs, unix domain sockets and networking enabled.
(unix domain sockets (CONFIG_UNIX) as a loadable kernel module may work,
but it is completely silly - don't complain if anything goes wrong.)
but it is completely silly - don't complain if anything goes wrong.)
- The proc filesystem must be mounted on /proc.
- The sysfs filesystem must be mounted at /sys. No other location
will be supported by udev.
- The proc filesystem must be mounted on /proc, the sysfs filesystem must
be mounted at /sys. No other location will be supported by udev.
Operation:
Udev creates and removes device nodes in /dev, based on events the kernel
sends out on device discovery or removal.
- Early in the boot process, the /dev directory should get a tmpfs
- Very early in the boot process, the /dev directory should get a 'tmpfs'
filesystem mounted, which is populated from scratch by udev. Created nodes
or changed permissions will not survive a reboot, which is intentional.
@ -39,12 +37,12 @@ Operation:
be copied over to the tmpfs mounted /dev, to provide the required nodes
to initialize udev and continue booting.
- The udevd daemon must be started by an init script to receive netlink
uevents from the kernel driver core.
- The old hotplug helper /sbin/hotplug should be disabled on bootup, before
actions like loading kernel modules are taken, which may cause a lot of
events.
- From kernel version 2.6.15 on, the hotplug helper /sbin/hotplug should
be disabled with an init script before actions like loading kernel
modules are taken, which may cause a lot of events.
- The udevd daemon must be started on bootup to receive netlink uevents
from the kernel driver core.
- All kernel events are matched against a set of specified rules in
/etc/udev/rules.d/ which make it possible to hook into the event