1 Kernel driver nct6683 1 Kernel driver nct6683
2 ===================== 2 =====================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * Nuvoton NCT6683D/NCT6687D 6 * Nuvoton NCT6683D/NCT6687D
7 7
8 Prefix: 'nct6683' 8 Prefix: 'nct6683'
9 9
10 Addresses scanned: ISA address retrieved f 10 Addresses scanned: ISA address retrieved from Super I/O registers
11 11
12 Datasheet: Available from Nuvoton upon req 12 Datasheet: Available from Nuvoton upon request
13 13
14 Authors: 14 Authors:
15 15
16 Guenter Roeck <linux@roeck-us.net> 16 Guenter Roeck <linux@roeck-us.net>
17 17
18 Description 18 Description
19 ----------- 19 -----------
20 20
21 This driver implements support for the Nuvoton 21 This driver implements support for the Nuvoton NCT6683D eSIO chip.
22 22
23 The chips implement up to shared 32 temperatur 23 The chips implement up to shared 32 temperature and voltage sensors.
24 It supports up to 16 fan rotation sensors and 24 It supports up to 16 fan rotation sensors and up to 8 fan control engines.
25 25
26 Temperatures are measured in degrees Celsius. 26 Temperatures are measured in degrees Celsius. Measurement resolution is
27 0.5 degrees C. 27 0.5 degrees C.
28 28
29 Voltage sensors (also known as IN sensors) rep 29 Voltage sensors (also known as IN sensors) report their values in millivolts.
30 30
31 Fan rotation speeds are reported in RPM (rotat 31 Fan rotation speeds are reported in RPM (rotations per minute).
32 32
33 Usage Note 33 Usage Note
34 ---------- 34 ----------
35 35
36 Limit register locations on Intel boards with 36 Limit register locations on Intel boards with EC firmware version 1.0
37 build date 04/03/13 do not match the register 37 build date 04/03/13 do not match the register locations in the Nuvoton
38 datasheet. Nuvoton confirms that Intel uses a 38 datasheet. Nuvoton confirms that Intel uses a special firmware version
39 with different register addresses. The specifi 39 with different register addresses. The specification describing the Intel
40 firmware is held under NDA by Nuvoton and Inte 40 firmware is held under NDA by Nuvoton and Intel and not available
41 to the public. 41 to the public.
42 42
43 Some of the register locations can be reverse 43 Some of the register locations can be reverse engineered; others are too
44 well hidden. Given this, writing any values fr 44 well hidden. Given this, writing any values from the operating system is
45 considered too risky with this firmware and ha 45 considered too risky with this firmware and has been disabled. All limits
46 must all be written from the BIOS. 46 must all be written from the BIOS.
47 47
48 The driver has only been tested with the Intel 48 The driver has only been tested with the Intel firmware, and by default
49 only instantiates on Intel boards. To enable i 49 only instantiates on Intel boards. To enable it on non-Intel boards,
50 set the 'force' module parameter to 1. 50 set the 'force' module parameter to 1.
51 51
52 Tested Boards and Firmware Versions 52 Tested Boards and Firmware Versions
53 ----------------------------------- 53 -----------------------------------
54 54
55 The driver has been reported to work with the 55 The driver has been reported to work with the following boards and
56 firmware versions. 56 firmware versions.
57 57
58 =============== ============================== 58 =============== ===============================================
59 Board Firmware version 59 Board Firmware version
60 =============== ============================== 60 =============== ===============================================
61 Intel DH87RL NCT6683D EC firmware version 1 61 Intel DH87RL NCT6683D EC firmware version 1.0 build 04/03/13
62 Intel DH87MC NCT6683D EC firmware version 1 62 Intel DH87MC NCT6683D EC firmware version 1.0 build 04/03/13
63 Intel DB85FL NCT6683D EC firmware version 1 63 Intel DB85FL NCT6683D EC firmware version 1.0 build 04/03/13
64 ASRock X570 NCT6683D EC firmware version 1 64 ASRock X570 NCT6683D EC firmware version 1.0 build 06/28/19
65 ASRock X670E NCT6686D EC firmware version 1 <<
66 MSI B550 NCT6687D EC firmware version 1 65 MSI B550 NCT6687D EC firmware version 1.0 build 05/07/20
67 MSI X670-P NCT6687D EC firmware version 0 <<
68 =============== ============================== 66 =============== ===============================================
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.