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KATE(4)               DragonFly Kernel Interfaces Manual               KATE(4)

NAME
     kate - AMD K8 temperature sensor

SYNOPSIS
     To compile this driver into the kernel, place the following lines in your
     kernel configuration file:

           device pci
           device kate

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

           kate_load="YES"

DESCRIPTION
     The kate driver provides support for the temperature sensors available in
     the AMD K8 family of processors.  (Subsequent AMD families are supported
     by km(4).)

     These sensors were officially introduced with Revision F Family 0Fh
     processors, and provide 1 degC accuracy.  Precision was improved in
     Revision G chips, which provide two more bits for 0.25 degC steppings.
     Each core may have two temperature sensors, and there may be up to two
     cores per package.

     Multiprocessor systems would have one instance of kate per each chip.  In
     each instance, temp0 and temp1 sensors correspond to the temperature
     sensors on the first core, whereas temp2 and temp3 correspond to the
     temperature sensors on the second core.  As such, single core chips may
     have two sensors, and dual-core dual-processor systems may have as many
     as 8 temperature sensors in total.

     Since many prior revisions of the chips appear to have valid readings for
     at least some temperature sensors in the same address space as the
     abovementioned revisions, the driver may also attach on such older
     revisions provided that it finds some sensor readings that appear valid.
     However, in such cases kate would not print the core revision information
     into the dmesg.

     Sensor values are made available through the HW_SENSORS sysctl(3)
     interface, and can be monitored with the systat(1) sensors display,
     sensorsd(8) and sysctl(8) hw.sensors.

SEE ALSO
     systat(1), sysctl(3), amdtemp(4), intro(4), km(4), pci(4), sensorsd(8),
     sysctl(8)

     BIOS and Kernel Developer's Guide for AMD NPT Family 0Fh Processors,
     Publication # 32559, pp. 21--23 and pp. 179--184, July 2007.

     Revision Guide for AMD NPT Family 0Fh Processors, Publication # 33610,
     February 2008.

HISTORY
     The kate driver first appeared in OpenBSD 4.4 and DragonFly 2.5.

AUTHORS
     The kate driver was written for OpenBSD and DragonFly by Constantine A.
     Murenin whilst at the University of Waterloo.

DragonFly 5.9-DEVELOPMENT       August 2, 2020       DragonFly 5.9-DEVELOPMENT