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linux/Documentation/hwmon/coretemp.rst
Laveesh Bansal f6702aa05a Documentation: hwmon: coretemp: Update supported CPUs and TjMax values 
Update the coretemp documentation to reflect current driver capabilities:

- Extend the supported CPU model list to include Atom processors from
  Bonnell through Jasper Lake, maintaining the original format with
  model numbers and adding X86_FEATURE_DTHERM as the actual detection
  mechanism. Added models: 0x37 (Bay Trail), 0x4a (Merrifield),
  0x4c (Cherry Trail), 0x5a (Moorefield), 0x5c (Apollo Lake),
  0x7a (Gemini Lake), 0x96 (Elkhart Lake), 0x9c (Jasper Lake)

- Update the description to note that per-package temperature sensing
  is available on Sandy Bridge and all newer processors

- Clarify that TjMax is read from MSR_IA32_TEMPERATURE_TARGET on modern
  CPUs (Nehalem and newer)

- Add TjMax values for newer Atom processor families to Appendix A:
  - 22nm Silvermont/Bay Trail: E38xx at 110C, Z37xx at 90C
  - 22nm Silvermont/Moorefield: Z35xx at 90C
  - 14nm Airmont/Cherry Trail: Z8xxx at 90C
  - 14nm Goldmont/Apollo Lake: 105C
  - 14nm Goldmont Plus/Gemini Lake: 105C
  - 10nm Tremont/Elkhart Lake: 105C
  - 10nm Tremont/Jasper Lake: 105C

TjMax values obtained from Intel ARK and official datasheets:
- E3845: https://www.intel.com/content/www/us/en/products/sku/78475/intel-atom-processor-e3845-2m-cache-1-91-ghz/specifications.html
- Z3600/Z3700: https://www.intel.com/content/dam/www/public/us/en/documents/datasheets/atom-z36xxx-z37xxx-datasheet-vol-1.pdf

Signed-off-by: Laveesh Bansal <laveeshb@laveeshbansal.com>
Link: https://lore.kernel.org/r/20260106155426.547872-2-laveeshb@laveeshbansal.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2026-01-31 07:38:32 -08:00

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Kernel driver coretemp
======================
Supported chips:
* All Intel Core family and Atom processors with Digital Thermal Sensor (DTS)
Prefix: 'coretemp'
CPUID: family 0x6, models with X86_FEATURE_DTHERM, including:
- 0xe (Pentium M DC), 0xf (Core 2 DC 65nm),
- 0x16 (Core 2 SC 65nm), 0x17 (Penryn 45nm),
- 0x1a (Nehalem), 0x1c (Atom), 0x1e (Lynnfield),
- 0x26 (Tunnel Creek Atom), 0x27 (Medfield Atom),
- 0x36 (Cedar Trail Atom), 0x37 (Bay Trail Atom),
- 0x4a (Merrifield Atom), 0x4c (Cherry Trail Atom),
- 0x5a (Moorefield Atom), 0x5c (Apollo Lake Atom),
- 0x7a (Gemini Lake Atom),
- 0x96 (Elkhart Lake Atom), 0x9c (Jasper Lake Atom)
Datasheet:
Intel 64 and IA-32 Architectures Software Developer's Manual
Volume 3A: System Programming Guide
http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
Author: Rudolf Marek
Description
-----------
This driver permits reading the DTS (Digital Temperature Sensor) embedded
inside Intel CPUs. This driver can read both the per-core and per-package
temperature using the appropriate sensors. The per-package sensor is
available on Sandy Bridge and all newer processors. The driver will show
the temperature of all cores inside a package under a single device
directory inside hwmon.
Temperature is measured in degrees Celsius and measurement resolution is
1 degree C. Valid temperatures are from 0 to TjMax degrees C, because
the actual value of temperature register is in fact a delta from TjMax.
Temperature known as TjMax is the maximum junction temperature of processor,
which depends on the CPU model. See table below. At this temperature, protection
mechanism will perform actions to forcibly cool down the processor. Alarm
may be raised, if the temperature grows enough (more than TjMax) to trigger
the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
All Sysfs entries are named with their core_id (represented here by 'X').
================= ========================================================
tempX_input Core temperature (in millidegrees Celsius).
tempX_max All cooling devices should be turned on (on Core2).
tempX_crit Maximum junction temperature (in millidegrees Celsius).
tempX_crit_alarm Set when Out-of-spec bit is set, never clears.
Correct CPU operation is no longer guaranteed.
tempX_label Contains string "Core X", where X is processor
number. For Package temp, this will be "Physical id Y",
where Y is the package number.
================= ========================================================
On modern CPUs (Nehalem and newer), TjMax is read from the
MSR_IA32_TEMPERATURE_TARGET register. On older models without this MSR,
TjMax is determined using lookup tables or heuristics. If these don't work
for your CPU, you can pass the correct TjMax value as a module parameter
(tjmax).
Appendix A. Known TjMax lists (TBD):
Some information comes from ark.intel.com
=============== =============================================== ================
Process Processor TjMax(C)
22nm Core i5/i7 Processors
i7 3920XM, 3820QM, 3720QM, 3667U, 3520M 105
i5 3427U, 3360M/3320M 105
i7 3770/3770K 105
i5 3570/3570K, 3550, 3470/3450 105
i7 3770S 103
i5 3570S/3550S, 3475S/3470S/3450S 103
i7 3770T 94
i5 3570T 94
i5 3470T 91
32nm Core i3/i5/i7 Processors
i7 2600 98
i7 660UM/640/620, 640LM/620, 620M, 610E 105
i5 540UM/520/430, 540M/520/450/430 105
i3 330E, 370M/350/330 90 rPGA, 105 BGA
i3 330UM 105
32nm Core i7 Extreme Processors
980X 100
32nm Celeron Processors
U3400 105
P4505/P4500 90
32nm Atom Processors
S1260/1220 95
S1240 102
Z2460 90
Z2760 90
D2700/2550/2500 100
N2850/2800/2650/2600 100
22nm Atom Processors (Silvermont/Bay Trail)
E3845/3827/3826/3825/3815/3805 110
Z3795/3775/3770/3740/3736/3735/3680 90
22nm Atom Processors (Silvermont/Moorefield)
Z3580/3570/3560/3530 90
14nm Atom Processors (Airmont/Cherry Trail)
x5-Z8550/Z8500/Z8350/Z8330/Z8300 90
x7-Z8750/Z8700 90
14nm Atom Processors (Goldmont/Apollo Lake)
x5-E3940/E3930 105
x7-E3950 105
14nm Celeron/Pentium Processors
(Goldmont/Apollo Lake)
J3455/J3355 105
N3450/N3350 105
N4200 105
14nm Celeron/Pentium Processors
(Goldmont Plus/Gemini Lake)
J4105/J4005 105
N4100/N4000 105
N5000 105
10nm Atom Processors (Tremont/Elkhart Lake)
x6000E 105
10nm Celeron/Pentium Processors
(Tremont/Jasper Lake)
N4500/N5100/N6000 series 105
45nm Xeon Processors 5400 Quad-Core
X5492, X5482, X5472, X5470, X5460, X5450 85
E5472, E5462, E5450/40/30/20/10/05 85
L5408 95
L5430, L5420, L5410 70
45nm Xeon Processors 5200 Dual-Core
X5282, X5272, X5270, X5260 90
E5240 90
E5205, E5220 70, 90
L5240 70
L5238, L5215 95
45nm Atom Processors
D525/510/425/410 100
K525/510/425/410 100
Z670/650 90
Z560/550/540/530P/530/520PT/520/515/510PT/510P 90
Z510/500 90
N570/550 100
N475/470/455/450 100
N280/270 90
330/230 125
E680/660/640/620 90
E680T/660T/640T/620T 110
E665C/645C 90
E665CT/645CT 110
CE4170/4150/4110 110
CE4200 series unknown
CE5300 series unknown
45nm Core2 Processors
Solo ULV SU3500/3300 100
T9900/9800/9600/9550/9500/9400/9300/8300/8100 105
T6670/6500/6400 105
T6600 90
SU9600/9400/9300 105
SP9600/9400 105
SL9600/9400/9380/9300 105
P9700/9600/9500/8800/8700/8600/8400/7570 105
P7550/7450 90
45nm Core2 Quad Processors
Q9100/9000 100
45nm Core2 Extreme Processors
X9100/9000 105
QX9300 100
45nm Core i3/i5/i7 Processors
i7 940XM/920 100
i7 840QM/820/740/720 100
45nm Celeron Processors
SU2300 100
900 105
65nm Core2 Duo Processors
Solo U2200, U2100 100
U7700/7600/7500 100
T7800/7700/7600/7500/7400/7300/7250/7200/7100 100
T5870/5670/5600/5550/5500/5470/5450/5300/5270 100
T5250 100
T5800/5750/5200 85
L7700/7500/7400/7300/7200 100
65nm Core2 Extreme Processors
X7900/7800 100
65nm Core Duo Processors
U2500/2400 100
T2700/2600/2450/2400/2350/2300E/2300/2250/2050 100
L2500/2400/2300 100
65nm Core Solo Processors
U1500/1400/1300 100
T1400/1350/1300/1250 100
65nm Xeon Processors 5000 Quad-Core
X5000 90-95
E5000 80
L5000 70
L5318 95
65nm Xeon Processors 5000 Dual-Core
5080, 5063, 5060, 5050, 5030 80-90
5160, 5150, 5148, 5140, 5130, 5120, 5110 80
L5138 100
65nm Celeron Processors
T1700/1600 100
560/550/540/530 100
=============== =============================================== ================
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