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Clemens Ladisch3c57e892009-12-16 21:38:25 +01001Kernel driver k10temp
2=====================
3
4Supported chips:
5* AMD Family 10h processors:
Clemens Ladischc5114a12010-01-10 20:52:34 +01006 Socket F: Quad-Core/Six-Core/Embedded Opteron (but see below)
7 Socket AM2+: Quad-Core Opteron, Phenom (II) X3/X4, Athlon X2 (but see below)
Clemens Ladisch3c57e892009-12-16 21:38:25 +01008 Socket AM3: Quad-Core Opteron, Athlon/Phenom II X2/X3/X4, Sempron II
9 Socket S1G3: Athlon II, Sempron, Turion II
10* AMD Family 11h processors:
11 Socket S1G2: Athlon (X2), Sempron (X2), Turion X2 (Ultra)
12
13 Prefix: 'k10temp'
14 Addresses scanned: PCI space
15 Datasheets:
16 BIOS and Kernel Developer's Guide (BKDG) For AMD Family 10h Processors:
17 http://support.amd.com/us/Processor_TechDocs/31116.pdf
18 BIOS and Kernel Developer's Guide (BKDG) for AMD Family 11h Processors:
19 http://support.amd.com/us/Processor_TechDocs/41256.pdf
20 Revision Guide for AMD Family 10h Processors:
21 http://support.amd.com/us/Processor_TechDocs/41322.pdf
22 Revision Guide for AMD Family 11h Processors:
23 http://support.amd.com/us/Processor_TechDocs/41788.pdf
24 AMD Family 11h Processor Power and Thermal Data Sheet for Notebooks:
25 http://support.amd.com/us/Processor_TechDocs/43373.pdf
26 AMD Family 10h Server and Workstation Processor Power and Thermal Data Sheet:
27 http://support.amd.com/us/Processor_TechDocs/43374.pdf
28 AMD Family 10h Desktop Processor Power and Thermal Data Sheet:
29 http://support.amd.com/us/Processor_TechDocs/43375.pdf
30
31Author: Clemens Ladisch <clemens@ladisch.de>
32
33Description
34-----------
35
36This driver permits reading of the internal temperature sensor of AMD
37Family 10h and 11h processors.
38
Clemens Ladischc5114a12010-01-10 20:52:34 +010039All these processors have a sensor, but on those for Socket F or AM2+,
40the sensor may return inconsistent values (erratum 319). The driver
41will refuse to load on these revisions unless you specify the "force=1"
42module parameter.
43
44Due to technical reasons, the driver can detect only the mainboard's
45socket type, not the processor's actual capabilities. Therefore, if you
46are using an AM3 processor on an AM2+ mainboard, you can safely use the
47"force=1" parameter.
Clemens Ladisch3c57e892009-12-16 21:38:25 +010048
49There is one temperature measurement value, available as temp1_input in
50sysfs. It is measured in degrees Celsius with a resolution of 1/8th degree.
51Please note that it is defined as a relative value; to quote the AMD manual:
52
53 Tctl is the processor temperature control value, used by the platform to
54 control cooling systems. Tctl is a non-physical temperature on an
55 arbitrary scale measured in degrees. It does _not_ represent an actual
56 physical temperature like die or case temperature. Instead, it specifies
57 the processor temperature relative to the point at which the system must
58 supply the maximum cooling for the processor's specified maximum case
59 temperature and maximum thermal power dissipation.
60
61The maximum value for Tctl is available in the file temp1_max.
62
63If the BIOS has enabled hardware temperature control, the threshold at
64which the processor will throttle itself to avoid damage is available in
65temp1_crit and temp1_crit_hyst.