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CONFIG_PPC_RTAS: Support for RTAS (RunTime Abstraction Services) in /proc

General informations

The Linux kernel configuration item CONFIG_PPC_RTAS has multiple definitions:

found in arch/powerpc/Kconfig

The configuration item CONFIG_PPC_RTAS:

Help text

(none)

found in arch/powerpc/platforms/Kconfig

The configuration item CONFIG_PPC_RTAS:

Help text

(none)

found in arch/ppc64/Kconfig

The configuration item CONFIG_PPC_RTAS:

Help text

(none)

Proc interface to RTAS found in arch/ppc64/Kconfig

The configuration item CONFIG_PPC_RTAS:

Help text

(none)

Support for RTAS (RunTime Abstraction Services) in /proc found in arch/ppc/Kconfig

The configuration item CONFIG_PPC_RTAS:

Help text

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.

Hardware

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