Intel ICHx/ICHx-M LPC
ichpcib* at pci?
isa* at ichpcib?
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
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.
ichpcib driver was written by
On some old machines with the ICH2-M chipset, Intel SpeedStep isn't available.