diff options
| -rw-r--r-- | README | 89 | ||||
| -rw-r--r-- | RELEASE-NOTES | 7 | ||||
| -rw-r--r-- | etc/udev/udev.conf.in | 6 |
3 files changed, 68 insertions, 34 deletions
@@ -4,65 +4,92 @@ For more information see the files in the docs/ directory. 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 reasonable distros use udev these - days, the major ones make it mandatory and the system will not work without it. + and differs a lot from distro to distro. All reasonable distros depend on udev + these days and the system will not work without it. The upstream udev project does not support or recomend to replace a distro's udev installation with the upstream version. The installation of a unmodified upstream version may render your system unusable! There is no "default" setup or a set of "default" rules provided by the upstream udev version. -udev requires: - - 2.6 version of the Linux kernel +Requirements: + - 2.6 version of the Linux kernel. - - the kernel must have sysfs, netlink, and hotplug enabled + - The kernel must have sysfs, netlink, and hotplug enabled. - - proc must be mounted on /proc + - The proc filesystem must be mounted on /proc. - - sysfs must be mounted at /sys, no other location is supported + - The sysfs filesystem must be mounted at /sys. No other location + is supported. - - udev creates and removes device nodes in /dev based on events + +Operation: + - Udev creates and removes device nodes in /dev based on events the kernel sends out on device discovery or removal - - during bootup /dev usually gets a tmpfs mounted which is populated scratch - by udev (created nodes don't survive a reboot, it always starts from scratch) + - Directly after mounting the root filesystem, the udevd daemon must be + started by an init script. + + - From kernel version 2.6.15 on, the hotplug helper /sbin/hotplug should + be disabled with an init script before kernel modules are loaded. + + - During bootup, /dev usually gets a tmpfs filesystem mounted which is + populated from scratch by udev (created nodes don't survive a reboot, + the /lib/udev/devices directory should be used for "static nodes"). - - udev replaces the hotplug event management invoked from /sbin/hotplug - by the udevd daemon, which receives the kernel events over netlink + - Udev replaces the hotplug event management invoked from /sbin/hotplug + by the udevd daemon, which receives the kernel events over netlink. - - all kernel events are matched against a set of specified rules which - make it posible to hook into the event processing + - All kernel events are matched against a set of specified rules which + make it possible to hook into the event processing. - - there is a copy of the rules files for all major distros in the etc/udev - directory (you may look there how others distros are doing it) + - Copies of the rules files for all major distros are in the etc/udev + directory (you may look there how others distros are doing it). -Setting which are used for building udev: +Compile Options: prefix - set this to the default root that you want to use - Only override this if you really know what you are doing + Set this to the default root that you want to use only override + this if you really know what you are doing even then, you probably + don't do the right thing. DESTDIR - prefix for install target for package building + Prefix for install target, used for package building. USE_LOG - if set to 'true', udev will emit messages to the syslog when - it creates or removes device nodes. This is helpful to see - what udev is doing. This is enabled by default. + if set to 'true', udev is able to pass errors or debug information + to syslog. This is very useful to see what udev is doing or not doing, + it is enabled by default. DEBUG - if set to 'true', verbose debugging messages will be compiled into - the udev binaries. Default value is 'false'. + If set to 'true', very verbose debugging messages will be compiled + into the udev binaries. The actual level of debugging is specified + in the udev config file. + STRIPCMD + If udev is compiled for packaging an empty string can be passed + to disable the stripping of the binaries. USE_SELINUX - if set to 'true', udev will be built with SELinux support + If set to 'true', udev will be built with SELinux support enabled. This is disabled by default. USE_KLIBC - if set to 'true', udev is built and linked against klibc. + If set to 'true', udev is built and linked against klibc. Default value is 'false'. KLCC specifies the klibc compiler - wrapper, usually in /usr/bin/klcc + wrapper, usually located at /usr/bin/klcc. EXTRAS - if set, will build the "extra" helper programs as specified - as listed (see below for an example.) + If set, will build the "extra" helper programs as specified + as listed (see below for an example). -if you want to build the udev helper program cdrom_id and scsi_id: +If you want to build the udev helper program cdrom_id and scsi_id: make EXTRAS="extras/cdrom_id extras/scsi_id" +Installation: + - The install target intall the udev binaries in the default locations, + all at boot time reqired binaries will be installed in /sbin. + + - The default location for scripts and binaries that are called from + rules is /lib/udev. + + - It is recommended to use the /lib/udev/devices directory to place + device nodes and symlinks in, which are copied to /dev at every boot. + That way, nodes for broken subsystems or devices which can't be + detected automatically by the kernel will always be available. + Please direct any comment/question/concern to the linux-hotplug-devel mailing list at: linux-hotplug-devel@lists.sourceforge.net diff --git a/RELEASE-NOTES b/RELEASE-NOTES index 69166cfef1..0d7951f75b 100644 --- a/RELEASE-NOTES +++ b/RELEASE-NOTES @@ -11,6 +11,13 @@ The option "udev_db" does no longer exist. All udev state will always be in /$udev_root/.udev/ now, there is no longer an option to set this to anything else. +Default location for rule sripts and helper programs is now: /lib/udev/. +Everything that is not useful on the commandline should go into this +directory. Also /lib/udev/devices/ is recommended as a directory where +packages or the user can place real device nodes, which get copied over +to /dev at every boot. This should replace the various solutions with +custom config files. + udev 075 ======== Silent a too verbose error logging for the old hotplug.d/ dev.d/ diff --git a/etc/udev/udev.conf.in b/etc/udev/udev.conf.in index 90c1f99ba6..a92f688c3a 100644 --- a/etc/udev/udev.conf.in +++ b/etc/udev/udev.conf.in @@ -1,13 +1,13 @@ # udev.conf -# Where in the filesystem to place the device nodes +# Where in the filesystem to place the device nodes. udev_root="@udevdir@" # The name and location of the udev rules file(s). udev_rules="@configdir@/rules.d" # The initial syslog(3) priority: "err", "info", "debug" or its -# numerical equivalent. For runtime debugging, change the daemons -# internal state with: "udevcontrol log_priority=<value>". +# numerical equivalent. For runtime debugging, the daemons internal +# state can be changed with: "udevcontrol log_priority=<value>". udev_log="err" |