Manual Pages — ATRTC

NAME

atrtc – AT Real-Time Clock (RTC) driver

SYNOPSIS
DESCRIPTION
SEE ALSO

SYNOPSIS

This driver is a mandatory part of i386/amd64 kernels.

The following tunables are settable from the loader(8):

hint.atrtc.X .clock controls event timers functionality support. Setting to 0, disables it. Default value is 1.

hw.atrtc.enable Forces enabling or disabling of the device(s). Setting to 0 disables it, setting to 1 enables it, bypassing any platform configuration hints. Default value is -1 (autodetect).

DESCRIPTION

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 divisors.

Event timer provided by the driver is irrelevant to CPU power states.

hint.atrtc.X .clock	controls event timers functionality support. Setting to 0, disables it. Default value is 1.
hw.atrtc.enable	Forces enabling or disabling of the device(s). Setting to 0 disables it, setting to 1 enables it, bypassing any platform configuration hints. Default value is -1 (autodetect).

Manual Pages — ATRTC

NAME

CONTENTS

SYNOPSIS

DESCRIPTION

SEE ALSO