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| -rw-r--r-- | README | 30 |
1 files changed, 14 insertions, 16 deletions
@@ -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 |