amdtemp(4) - NetBSD Manual Pages

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


NAME

     amdtemp -- AMD CPU on-die digital thermal sensor


SYNOPSIS

     amdtemp* at pci? dev ? function ?


DESCRIPTION

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

NetBSD 5.2                     November 19, 2008                    NetBSD 5.2