79 lines
2.7 KiB
Groff
79 lines
2.7 KiB
Groff
.\" $NetBSD: ichlpcib.4,v 1.6 2008/04/30 13:10:54 martin Exp $
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.\"
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.\" Copyright (c) 2004 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Minoura Makoto and Matthew R. Green.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd March 28, 2008
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.Dt ICHLPCIB 4
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.Os
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.Sh NAME
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.Nm ichlpcib
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.Nd Intel ICH LPC Interface Bridge
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.Sh SYNOPSIS
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.Cd "ichlpcib* at pci? dev ? function ?"
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.Cd "hpet0 at ichlpcib?"
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.Cd "isa0 at ichlpcib?"
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.Sh DESCRIPTION
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The
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.Nm
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driver supports the Intel ICH LPC Interface Bridges on compatible
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chipsets. Supported functions include:
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.Bl -bullet
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.It
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Watchdog timer.
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The watchdog timer may be configured for a 2 seconds (on ICH6 or newer)
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and 4 seconds (on ICH5 or older) min period and for a 39 seconds
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(on ICH5 or older) or 613 seconds max period (on ICH6 or newer).
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.It
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Power Management timer. A 24-bit timer available to be used by the
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timecounters framework.
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.It
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SpeedStep.
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In some systems the SpeedStep function is also available, and can be
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used to switch between high and low frequency (to reduce power consumption)
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via the
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.Em machdep.speedstep_state
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.Xr sysctl 8
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node. A value of 0 will use the low frequency (low power) and a 1 will
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enable the high frequency (full power).
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.El
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.Sh SEE ALSO
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.Xr sysctl 8 ,
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.Xr wdogctl 8
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Nx 3.0 .
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An Minoura Makoto
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and
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.An Matthew R. Green .
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