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AMDTEMP(4) NetBSD Kernel Interfaces Manual AMDTEMP(4)
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by Kimmo Suominen.
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amdtemp -- AMD CPU on-die digital thermal sensor
amdtemp* at amdnb_miscbus?
The amdtemp driver provides support for the on-die digital thermal sensor
present on AMD K8, AMD Barcelona, AMD Phenom, AMD Griffin, AMD Fusion,
AMD Bobcat, and AMD Puma CPUs.
These sensors were officially introduced in AMD K8 Revision F processors,
and provide 0.5°C accuracy. Precision was improved in Revision G chips,
which provide two more bits for 0.25°C steppings. Each core has two tem-
perature sensors, and there are up to two cores per CPU socket.
AMD Barcelona, AMD Phenom, AMD Griffin, AMD Fusion, AMD Bobcat, and AMD
Puma provide 0.125°gC 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 µK cpuN temperature
envsys(4), envstat(8), powerd(8)
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.
The amdtemp driver was written by Constantine A. Murenin
<firstname.lastname@example.org> whilst at the University of Waterloo. It was adapted
to NetBSD by Christoph Egger.
NetBSD 9.1 January 28, 2018 NetBSD 9.1