6 * AMD Athlon64/FX or Opteron CPUs
10 Addresses scanned: PCI space
12 Datasheet: http://www.amd.com/system/files/TechDocs/32559.pdf
16 Contact: Rudolf Marek <r.marek@assembler.cz>
21 This driver permits reading temperature sensor(s) embedded inside AMD K8
22 family CPUs (Athlon64/FX, Opteron). Official documentation says that it works
23 from revision F of K8 core, but in fact it seems to be implemented for all
24 revisions of K8 except the first two revisions (SH-B0 and SH-B3).
26 Please note that you will need at least lm-sensors 2.10.1 for proper userspace
29 There can be up to four temperature sensors inside single CPU. The driver
30 will auto-detect the sensors and will display only temperatures from
33 Mapping of /sys files is as follows:
35 ============= ===================================
36 temp1_input temperature of Core 0 and "place" 0
37 temp2_input temperature of Core 0 and "place" 1
38 temp3_input temperature of Core 1 and "place" 0
39 temp4_input temperature of Core 1 and "place" 1
40 ============= ===================================
42 Temperatures are measured in degrees Celsius and measurement resolution is
43 1 degree C. It is expected that future CPU will have better resolution. The
44 temperature is updated once a second. Valid temperatures are from -49 to
47 Temperature known as TCaseMax was specified for processors up to revision E.
48 This temperature is defined as temperature between heat-spreader and CPU
49 case, so the internal CPU temperature supplied by this driver can be higher.
50 There is no easy way how to measure the temperature which will correlate
51 with TCaseMax temperature.
53 For newer revisions of CPU (rev F, socket AM2) there is a mathematically
54 computed temperature called TControl, which must be lower than TControlMax.
56 The relationship is following:
58 temp1_input - TjOffset*2 < TControlMax,
60 TjOffset is not yet exported by the driver, TControlMax is usually
61 70 degrees C. The rule of the thumb -> CPU temperature should not cross
62 60 degrees C too much.