ICHLPCIB(4) | Kernel Interfaces Manual (x86) | ICHLPCIB(4)

# NAME

ichlpcib — Intel ICH LPC Interface Bridge

# SYNOPSIS

ichlpcib* at pci? dev ? function ?
fwhrng* at ichlpcib?
hpet0 at ichlpcib?
isa0 at ichlpcib?
gpio* at ichlpcib?

# DESCRIPTION

The ichlpcib driver supports the Intel ICH LPC Interface Bridges on compatible chipsets. Supported functions include:

- Watchdog timer. The watchdog timer may be configured for a 2 seconds (on ICH6 or newer) and 4 seconds (on ICH5 or older) min period and for a 39 seconds (on ICH5 or older) or 613 seconds max period (on ICH6 or newer).
- Power Management timer. A 24-bit timer available to be used by the timecounters framework.
- SpeedStep. In some older systems the SpeedStep function is also available, and can be used to switch between high and low frequency (to reduce power consumption) via the `machdep.speedstep_state` sysctl(8) node. A value of 0 will use the low frequency (low power) and a 1 will enable the high frequency (full power).
- General Purpose Input/Output. The ICH provides up to 64 I/O pins which can be accessed through the gpio(4) framework.

# SEE ALSO

est(4), fwhrng(4), gpio(4), hpet(4), ioapic(4), sysctl(8), wdogctl(8)

Intel Corporation, Intel I/O Controller Hub 6 (ICH6) Family, January, 2005, http://www.intel.com/assets/pdf/datasheet/301473.pdf.

Intel Corporation, Intel I/O Controller Hub 7 (ICH7) Family, April, 2007, http://www.intel.com/Assets/PDF/datasheet/307013.pdf.

Intel Corporation, Intel I/O Controller Hub 8 (ICH8) Family, May, 2007, http://www.intel.com/assets/pdf/datasheet/313056.pdf.

Intel Corporation, Using the Intel ICH Family Watchdog Timer (WDT), September, 2002, ftp://download.intel.com/design/chipsets/applnots/29227301.pdf.

# HISTORY

The ichlpcib driver first appeared in NetBSD 3.0.

# AUTHORS

The ichlpcib driver was written by Minoura Makoto and Matthew R. Green.

March 18, 2011 | NetBSD 6.0