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PIIXPCIB(4) BSD Kernel Interfaces 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 follow-
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>.
BSD March 1, 2011 BSD
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