ICHPCIB(4) | Device Drivers Manual (i386) | ICHPCIB(4)

# NAME

`ichpcib` — Intel ICHx/ICHx-M LPC bridges

# SYNOPSIS

`ichpcib* at pci?`
`isa* at ichpcib?`

# DESCRIPTION

The `ichpcib` driver supports Intel ICH, ICH0, ICH2, ICH2-M, ICH3-S, ICH3-M, ICH4, ICH4-M, ICH5, ICH6, ICH7, ICH7-M, ICH8, ICH8-M, ICH9, 6300ESB and 6321ESB LPC bridges. These devices are mostly usual PCI-ISA bridges but with some additional power management and monitoring capabilities. Besides the core functionality, the `ichpcib` driver provides support for the Intel SpeedStep technology, available for the ICH2-M, ICH3-M, and ICH4-M chipsets, and power management timer available for all chipsets. It allows the user to control CPU frequency with the sysctl(8) program.

# SEE ALSO

cpu(4), intro(4), isa(4), pci(4), sysctl(8)

# HISTORY

Intel SpeedStep support for the ICHx-M chipsets first appeared in OpenBSD 3.5 as part of the pcib(4) driver. The `ichpcib` driver first appeared in OpenBSD 3.6.

# AUTHORS

The `ichpcib` driver was written by Alexander Yurchenko <grange@openbsd.org>.

# CAVEATS

On some old machines with the ICH2-M chipset, Intel SpeedStep isn't available.

July 16, 2013 | Debian