5 * AMD Athlon64/FX or Opteron CPUs
7 Addresses scanned: PCI space
8 Datasheet: http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/32559.pdf
11 Contact: Rudolf Marek <r.marek@sh.cvut.cz>
16 This driver permits reading temperature sensor(s) embedded inside AMD K8
17 family CPUs (Athlon64/FX, Opteron). Official documentation says that it works
18 from revision F of K8 core, but in fact it seems to be implemented for all
19 revisions of K8 except the first two revisions (SH-B0 and SH-B3).
21 Please note that you will need at least lm-sensors 2.10.1 for proper userspace
24 There can be up to four temperature sensors inside single CPU. The driver
25 will auto-detect the sensors and will display only temperatures from
28 Mapping of /sys files is as follows:
30 temp1_input - temperature of Core 0 and "place" 0
31 temp2_input - temperature of Core 0 and "place" 1
32 temp3_input - temperature of Core 1 and "place" 0
33 temp4_input - temperature of Core 1 and "place" 1
35 Temperatures are measured in degrees Celsius and measurement resolution is
36 1 degree C. It is expected that future CPU will have better resolution. The
37 temperature is updated once a second. Valid temperatures are from -49 to
40 Temperature known as TCaseMax was specified for processors up to revision E.
41 This temperature is defined as temperature between heat-spreader and CPU
42 case, so the internal CPU temperature supplied by this driver can be higher.
43 There is no easy way how to measure the temperature which will correlate
44 with TCaseMax temperature.
46 For newer revisions of CPU (rev F, socket AM2) there is a mathematically
47 computed temperature called TControl, which must be lower than TControlMax.
49 The relationship is following:
51 temp1_input - TjOffset*2 < TControlMax,
53 TjOffset is not yet exported by the driver, TControlMax is usually
54 70 degrees C. The rule of the thumb -> CPU temperature should not cross
55 60 degrees C too much.