DFS(4) | Device Drivers Manual (macppc) | DFS(4) |
dfs
— Dynamic
Frequency Switching
dfs* at macgpio?
The dfs
driver provides support for the
Dynamic Frequency Switching feature found on some PowerPC
microprocessors.
It conserves power by lowering the processor operating frequency. Depending on the processor model, the processor-to-system bus ratio can be divided by two or four.
Processors supported by the dfs
driver are
part of the PowerPC G4 family and are found on various iBook and PowerBook
machines:
MPC7447A PowerPC 7447 "Apollo 7" MPC7448 PowerPC 7448 "Apollo 8"
MPC7450 RISC Microprocessor Family Reference Manual.
Support for the dfs
driver first appeared
in OpenBSD 5.0.
May 25, 2011 | OpenBSD-current |