1.\" $OpenBSD: ichpcib.4,v 1.12 2013/07/16 16:05:49 schwarze Exp $ 2.\" 3.\" Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: July 16 2013 $ 18.Dt ICHPCIB 4 i386 19.Os 20.Sh NAME 21.Nm ichpcib 22.Nd Intel ICHx/ICHx-M LPC bridges 23.Sh SYNOPSIS 24.Cd "ichpcib* at pci?" 25.Cd "isa* at ichpcib?" 26.Sh DESCRIPTION 27The 28.Nm 29driver supports Intel 30.Tn ICH , 31.Tn ICH0 , 32.Tn ICH2 , 33.Tn ICH2-M , 34.Tn ICH3-S , 35.Tn ICH3-M , 36.Tn ICH4 , 37.Tn ICH4-M , 38.Tn ICH5 , 39.Tn ICH6 , 40.Tn ICH7 , 41.Tn ICH7-M , 42.Tn ICH8 , 43.Tn ICH8-M , 44.Tn ICH9 , 45.Tn 6300ESB 46and 47.Tn 6321ESB 48LPC bridges. 49These devices are mostly usual 50.Tn PCI-ISA 51bridges but with some additional power management and monitoring 52capabilities. 53Besides the core functionality, the 54.Nm 55driver provides support for the Intel SpeedStep technology, available 56for the 57.Tn ICH2-M , 58.Tn ICH3-M , 59and 60.Tn ICH4-M 61chipsets, and power management timer available for all chipsets. 62It allows the user to control CPU frequency with the 63.Xr sysctl 8 64program. 65.Sh SEE ALSO 66.Xr cpu 4 , 67.Xr intro 4 , 68.Xr isa 4 , 69.Xr pci 4 , 70.Xr sysctl 8 71.Sh HISTORY 72Intel SpeedStep support for the ICHx-M chipsets first appeared in 73.Ox 3.5 74as part of the 75.Xr pcib 4 76driver. 77The 78.Nm 79driver first appeared in 80.Ox 3.6 . 81.Sh AUTHORS 82The 83.Nm 84driver was written by 85.An Alexander Yurchenko Aq Mt grange@openbsd.org . 86.Sh CAVEATS 87On some old machines with the 88.Tn ICH2-M 89chipset, Intel SpeedStep isn't available. 90