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PIIXPCIB(4)                  Device Drivers Manual                 PIIXPCIB(4)

     piixpcib - Intel PIIX4 PCI-ISA bridge with SpeedStep

     piixpcib* at pci? dev ? function ?
     isa* at piixpcib?

     The piixpcib driver provides support for the Intel PIIX and compatible
     PCI-ISA Bridges with Intel's first generation SpeedStep.

     Frequency scaling is supported on Pentium III with two voltage modes,
     used by SpeedStep as power states low and high.  The driver will switch
     into low power state by reducing voltage and frequency of the CPU.  The
     factor depends on the processor itself, but will always reduce power
     consumption about 1/2.

     The user can manually control the CPU frequency with the sysctl(8)
     program using the following node:

           machdep.speedstep_state = [0/1]

     est(4), isa(4), pci(4), apmd(8), sysctl(8)

     The piixpcib driver first appeared in FreeBSD 5.5 and then in NetBSD 4.0.

     The current piixpcib driver was written by Bruno Ducrot.  It was ported
     to NetBSD by Jared D. McNeill <jmcneill@NetBSD.org>.

NetBSD 8.0                       March 1, 2011                      NetBSD 8.0