diff options
| -rw-r--r-- | README | 23 |
1 files changed, 9 insertions, 14 deletions
@@ -31,22 +31,21 @@ Operation: Udev creates and removes device nodes in /dev, based on events the kernel sends out on device discovery or removal. - - Directly after mouting the real root filesystem, wherever that - happens, in initramfs or with a directly mounted root, /dev should get - a tmpfs filesystem mounted, which is populated from scratch by udev. - Created nodes or changed permissions don't survive a reboot. + - Early in the boot process, /dev 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. - The content of /lib/udev/devices directory which contains the nodes, - symlinks and directories, which are always expected to be in/dev, should + symlinks and directories, which are always expected to be in /dev, should 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 - events from the kernel driver core. + uevents from the kernel driver core. - From kernel version 2.6.15 on, the hotplug helper /sbin/hotplug should - be disabled with an init script before the boot scripts are run and - kernel modules are loaded. + be disabled with an init script before actions like loading kernel + modules are taken, which may cause a lot of events. - 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 @@ -56,12 +55,8 @@ Operation: 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, even then, you probably - don't do the right thing. DESTDIR - Prefix for install target, used for package building. + Prefix of install target, used for package building. USE_LOG 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. @@ -95,7 +90,7 @@ Installation: - The default location for scripts and binaries that are called from rules is /lib/udev. Other packages who install udev rules, should use - that diretory too. + that directory too. - 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. |