The SPU file system is used to access Synergistic Processing Units on machines implementing the Broadband Processor Architecture.
Support Pinhole Resetbutton on IBM Cell blades. This adds a method to trigger system reset via front panel pinhole button.
Support Powerbutton on IBM Cell blades. This will enable the powerbutton as an input device.
PMI (Platform Management Interrupt) is a way to communicate with the BMC (Baseboard Management Controller). It is used in some IBM Cell blades.
This governor checks for spu usage to adjust the cpu frequency. If no spu is running on a given cpu, that cpu will be throttled to the minimal possible frequency.