NAME

amdtemp — AMD CPU on-die digital thermal sensor

SYNOPSIS

amdtemp* at pchb?

DESCRIPTION

The amdtemp driver provides support for the on-die digital thermal sensor present on AMD K8, AMD Barcelona, AMD Phenom, AMD Griffin, and AMD Fusion CPUs.

These sensors were officially introduced in AMD K8 Revision F processors, and provide 0.5 degC accuracy. Precision was improved in Revision G chips, which provide two more bits for 0.25 degC steppings. Each core has two temperature sensors, and there are up to two cores per CPU socket.

AMD Barcelona, AMD Phenom, AMD Griffin, and AMD Fusion provide 0.125 degC accuracy and provide one temperature sensor for each CPU socket.

The amdtemp driver reports temperatures through the envsys(4) API.

Sensor	Units	Typical Use
CPUN sensor0	uK	cpuN temperature

SEE ALSO

envsys(4), envstat(8), powerd(8)

HISTORY

The amdtemp driver first appeared in OpenBSD 4.4 named “kate”. It was then ported to NetBSD 5.0. The driver has been renamed with support for newer AMD CPUs.

AUTHORS

The amdtemp driver was written by Constantine A. Murenin <cnst@openbsd.org> whilst at the University of Waterloo. It was adapted to NetBSD by Christoph Egger.