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:
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>.
March 1, 2011 | NetBSD 10.99 |