Manual Reference Pages - ATRTC (4)
- AT Real-Time Clock (RTC) driver
This driver is a mandatory part of i386/amd64 kernels.
The following tunable is settable from the
| hint.atrtc. X .clock
controls event timers functionality support. Setting to 0, disables it.
Default value is 1.
This driver uses RTC hardware to supply kernel with time-of-day clock
with 1 second resolution and one event timer.
This hardware uses base frequency of 32768Hz for advancing time-of-day clock
and generating periodic interrupts.
Interrupts could be generated with fixed number of frequencies, from 2Hz to
8192Hz, obtained by dividing base frequency by one of supported power-of-2
Event timer provided by the driver is irrelevant to CPU power states.
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