kernel-ark/Documentation/hwmon/k8temp
Justin P. Mattock 0ea6e61122 Documentation: update broken web addresses.
Below you will find an updated version from the original series bunching all patches into one big patch
updating broken web addresses that are located in Documentation/*
Some of the addresses date as far far back as 1995 etc... so searching became a bit difficult,
the best way to deal with these is to use web.archive.org to locate these addresses that are outdated.
Now there are also some addresses pointing to .spec files some are located, but some(after searching
on the companies site)where still no where to be found. In this case I just changed the address
to the company site this way the users can contact the company and they can locate them for the users.

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Signed-off-by: Thomas Weber <weber@corscience.de>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Cc: Paulo Marques <pmarques@grupopie.com>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Michael Neuling <mikey@neuling.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-08-04 15:21:40 +02:00

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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.