AMDTEMP(4)              NetBSD Kernel Interfaces Manual             AMDTEMP(4)

     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 0.5C accuracy.  Precision was improved in Revision G chips,
     which provide two more bits for 0.25C 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 0.125gC 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    K       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
     <> whilst at the University of Waterloo.  It was adapted
     to NetBSD by Christoph Egger.

NetBSD 9.0                     January 28, 2018                     NetBSD 9.0

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