AMDZENTEMP(4)         NetBSD/x86 Kernel Interfaces Manual        AMDZENTEMP(4)

NAME
     amdzentemp -- AMD Zen CPU family on-die digital thermal sensor

SYNOPSIS
     amdzentemp* at amdsmnbus?

DESCRIPTION
     The amdzentemp driver provides support for the on-die digital thermal
     sensor present on AMD Ryzen CPUs

     These sensors provide 0.125C accuracy.  There is one sensor for each CPU
     socket.

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

           Sensor          Units    Typical Use
           CPUN sensor0    K       cpuN temperature

SEE ALSO
     amdtemp(4), envsys(4), envstat(8), powerd(8)

HISTORY
     The amdzentemp driver first appeared in OpenBSD 4.4 named ``kate''.  It
     was then ported to NetBSD 5.0 under the name amdtemp(4).  The FreeBSD
     version of the driver was updated with support for newer AMD CPUs.  For
     NetBSD, the support for the newer CPUs was separated into its own
     amdzentemp driver.

AUTHORS
     The amdzentemp driver was written by Constantine A. Murenin
     <cnst@openbsd.org> whilst at the University of Waterloo.  Porting of sup-
     port for the newer AMD CPUs from FreeBSD was provided by Ian Clark.

BUGS
     The temperature reading provided to envsys(4) needs to have a CPU-depen-
     dent offset applied.  For Ryzen X processors, the offset is 20C, while
     for Threadripper processors an offset of 27C is needed.

     The sensor has a thermal-trip value which should be retrieved and pro-
     vided to envsys(4) as the sensors critical-maximum value.

NetBSD 9.0                     January 28, 2018                     NetBSD 9.0

You can also request any man page by name and (optionally) by section:

Command: 
Section: 
Architecture: 
Collection: 
 

Use the DEFAULT collection to view manual pages for third-party software.


©1994 Man-cgi 1.15, Panagiotis Christias
©1996-2019 Modified for NetBSD by Kimmo Suominen