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?
tco* 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 1 seconds (on ICH6 or newer) and 2 seconds (on ICH5 or older) min period and for a 23 seconds (on ICH5 or older) or 367 seconds max period (on ICH6 or newer).

    Prior to NetBSD 8.0, the x86/tco(4) watchdog timer was included as part of the ichlpcib driver, and did not require explicit configuration.

•   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
gpio(4), x86/est(4), x86/fwhrng(4), x86/hpet(4), x86/ioapic(4), x86/tco(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.