+config PPC_RTAS
+ bool "Support for RTAS (RunTime Abstraction Services) in /proc"
+ depends on PPC_OF && PROC_FS
+ ---help---
+ When you use this option, you will be able to use RTAS from
+ userspace.
+
+ RTAS stands for RunTime Abstraction Services and should
+ provide a portable way to access and set system information. This is
+ commonly used on RS/6000 (pSeries) computers.
+
+ You can access RTAS via the special proc file system entry rtas.
+ Don't confuse this rtas entry with the one in /proc/device-tree/rtas
+ which is readonly.
+
+ If you don't know if you can use RTAS look into
+ /proc/device-tree/rtas. If there are some entries, it is very likely
+ that you will be able to use RTAS.
+
+ You can do cool things with rtas. To print out information about
+ various sensors in the system, just do a
+
+ $ cat /proc/rtas/sensors
+
+ or if you power off your machine at night but want it running when
+ you enter your office at 7:45 am, do a
+
+ # date -d 'tomorrow 7:30' +%s > /proc/rtas/poweron
+
+ and shutdown.
+
+ If unsure, say Y.
+