1 Kernel driver via686a
2 =====================
3
4 Supported chips:
5
6 * Via VT82C686A, VT82C686B Southbridge Inte
7
8 Prefix: 'via686a'
9
10 Addresses scanned: ISA in PCI-space encode
11
12 Datasheet: On request through web form (ht
13
14 Authors:
15 - Kyösti Mälkki <kmalkki@cc.hut.fi>,
16 - Mark D. Studebaker <mdsxyz123@yahoo.c
17 - Bob Dougherty <bobd@stanford.edu>
18 - (Some conversion-factor data were co
19 - Jonathan Teh Soon Yew <j.teh@iname.co
20 - and Alex van Kaam <darkside@chello.nl
21
22 Module Parameters
23 -----------------
24
25 ======================= ======================
26 force_addr=0xaddr Set the I/O base addre
27 don't set the address
28 upgrade before resorti
29 PCI force; the via686a
30 Don't use this unless
31 base address is not se
32 Example: 'modprobe via
33 ======================= ======================
34
35 Description
36 -----------
37
38 The driver does not distinguish between the ch
39 all as a 686A.
40
41 The Via 686a southbridge has integrated hardwa
42 It also has an I2C bus, but this driver only s
43 For the I2C bus driver, see <file:Documentatio
44
45 The Via 686a implements three temperature sens
46 sensors, five voltage sensors and alarms.
47
48 Temperatures are measured in degrees Celsius.
49 when the Overtemperature Shutdown limit is cro
50 as soon as it drops below the hysteresis value
51
52 Fan rotation speeds are reported in RPM (rotat
53 triggered if the rotation speed has dropped be
54 readings can be divided by a programmable divi
55 the readings more range or accuracy. Not all R
56 represented, so some rounding is done. With a
57 representable value is around 2600 RPM.
58
59 Voltage sensors (also known as IN sensors) rep
60 An alarm is triggered if the voltage has cross
61 or maximum limit. Voltages are internally scal
62 has a different resolution and range.
63
64 If an alarm triggers, it will remain triggered
65 is read at least once. This means that the cau
66 already have disappeared! Note that in the cur
67 hardware registers are read whenever any data
68 than 1.5 seconds since the last update). This
69 miss once-only alarms.
70
71 The driver only updates its values each 1.5 se
72 will do no harm, but will return 'old' values.
73
74 Known Issues
75 ------------
76
77 This driver handles sensors integrated in some
78 possible that a motherboard maker used a VT82C
79 product design but was not interested in its h
80 in which case the sensor inputs will not be wi
81 the Asus K7V, A7V and A7V133 motherboards, to
82 So, if you need the force_addr parameter, and
83 don't seem to make any sense, don't look any f
84 not wired for hardware monitoring.
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