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

ichpcibIntel ICHx/ICHx-M LPC bridges

ichpcib* at pci?
isa* at ichpcib?

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.

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

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.

The ichpcib driver was written by Alexander Yurchenko <>.

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

July 16, 2013 OpenBSD-5.8