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- Kernel driver k8temp
- ====================
- Supported chips:
- * AMD Athlon64/FX or Opteron CPUs
- Prefix: 'k8temp'
- Addresses scanned: PCI space
- Datasheet: http://support.amd.com/us/Processor_TechDocs/32559.pdf
- Author: Rudolf Marek
- Contact: Rudolf Marek <r.marek@assembler.cz>
- Description
- -----------
- This driver permits reading temperature sensor(s) embedded inside AMD K8
- family CPUs (Athlon64/FX, Opteron). Official documentation says that it works
- from revision F of K8 core, but in fact it seems to be implemented for all
- revisions of K8 except the first two revisions (SH-B0 and SH-B3).
- Please note that you will need at least lm-sensors 2.10.1 for proper userspace
- support.
- There can be up to four temperature sensors inside single CPU. The driver
- will auto-detect the sensors and will display only temperatures from
- implemented sensors.
- Mapping of /sys files is as follows:
- temp1_input - temperature of Core 0 and "place" 0
- temp2_input - temperature of Core 0 and "place" 1
- temp3_input - temperature of Core 1 and "place" 0
- temp4_input - temperature of Core 1 and "place" 1
- Temperatures are measured in degrees Celsius and measurement resolution is
- 1 degree C. It is expected that future CPU will have better resolution. The
- temperature is updated once a second. Valid temperatures are from -49 to
- 206 degrees C.
- Temperature known as TCaseMax was specified for processors up to revision E.
- This temperature is defined as temperature between heat-spreader and CPU
- case, so the internal CPU temperature supplied by this driver can be higher.
- There is no easy way how to measure the temperature which will correlate
- with TCaseMax temperature.
- For newer revisions of CPU (rev F, socket AM2) there is a mathematically
- computed temperature called TControl, which must be lower than TControlMax.
- The relationship is following:
- temp1_input - TjOffset*2 < TControlMax,
- TjOffset is not yet exported by the driver, TControlMax is usually
- 70 degrees C. The rule of the thumb -> CPU temperature should not cross
- 60 degrees C too much.
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