NetBSD-5.0.2/share/man/man4/ichlpcib.4

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.\"	$NetBSD: ichlpcib.4,v 1.6 2008/04/30 13:10:54 martin Exp $
.\"
.\" Copyright (c) 2004 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Minoura Makoto and Matthew R. Green.
.\"
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.\"    notice, this list of conditions and the following disclaimer.
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.Dd March 28, 2008
.Dt ICHLPCIB 4
.Os
.Sh NAME
.Nm ichlpcib
.Nd Intel ICH LPC Interface Bridge
.Sh SYNOPSIS
.Cd "ichlpcib* at pci? dev ? function ?"
.Cd "hpet0     at ichlpcib?"
.Cd "isa0      at ichlpcib?"
.Sh DESCRIPTION
The
.Nm
driver supports the Intel ICH LPC Interface Bridges on compatible
chipsets. Supported functions include:
.Bl -bullet
.It
Watchdog timer.
The watchdog timer may be configured for a 2 seconds (on ICH6 or newer)
and 4 seconds (on ICH5 or older) min period and for a 39 seconds
(on ICH5 or older) or 613 seconds max period (on ICH6 or newer).
.It
Power Management timer. A 24-bit timer available to be used by the
timecounters framework.
.It
SpeedStep.
In some systems the SpeedStep function is also available, and can be
used to switch between high and low frequency (to reduce power consumption)
via the
.Em machdep.speedstep_state
.Xr sysctl 8
node. A value of 0 will use the low frequency (low power) and a 1 will
enable the high frequency (full power).
.El
.Sh SEE ALSO
.Xr sysctl 8 ,
.Xr wdogctl 8
.Sh HISTORY
The
.Nm
driver first appeared in
.Nx 3.0 .
.Sh AUTHORS
The
.Nm
driver was written by
.An Minoura Makoto
and
.An Matthew R. Green .