ichlpcib(4) - NetBSD Manual Pages

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ICHLPCIB(4)             NetBSD Kernel Interfaces Manual            ICHLPCIB(4)


NAME

     ichlpcib -- Intel ICH LPC Interface Bridge


SYNOPSIS

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


DESCRIPTION

     The ichlpcib driver supports the Intel ICH LPC Interface Bridges on com-
     patible 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 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).


SEE ALSO

     sysctl(8), wdogctl(8)


HISTORY

     The ichlpcib driver first appeared in NetBSD 3.0.


AUTHORS

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

NetBSD 5.2.3                    March 28, 2008                    NetBSD 5.2.3