Added automatic driver loading (#469)

* Added automatic driver loading
When the config file sets enable_autoload_drivers=1, the installer will
enable driver loading on hotplug events using mdev.conf, and it will try
to load drivers for already connected devices.

* * Fixed modprobe for module aliases that contain whitespace

* * Removed enable_autoload_drivers option, enabling it by default

scripts/etc/init.d/rcS

@@ -296,6 +296,12 @@ echo
 
 # depmod needs to update modules.dep before using modprobe
 depmod -a
+
+# coldplug modules
+echo "Loading drivers."
+find /sys/ -name modalias -print0 | xargs -0 sort -u -z | xargs -0 modprobe -abq
+echo "Finished loading drivers."
+
 if [ "$drivers_to_load" != "" ] ; then
    echo "Loading additional drivers."
    for driver in $drivers_to_load

scripts/etc/mdev.conf

@@ -0,0 +1,18 @@
+# mdev.conf
+#
+# Provide user, group, and mode information for devices.  If a regex matches
+# the device name provided by sysfs, use the appropriate user:group and mode
+# instead of the default 0:0 660.
+#
+# Syntax:
+# [-]devicename_regex user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
+# [-]$ENVVAR=regex    user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
+# [-]@maj,min[-min2]  user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
+#
+# [-]: do not stop on this match, continue reading mdev.conf
+# =: move, >: move and create a symlink
+# !: do not create device node
+# @|$|*: run @cmd if $ACTION=add, $cmd if $ACTION=remove, *cmd in all cases
+
+# support module loading on hotplug
+$MODALIAS=.*	0:0	660	@modprobe -b "$MODALIAS"