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-rw-r--r--Documentation/hwmon/via686a17
1 files changed, 15 insertions, 2 deletions
diff --git a/Documentation/hwmon/via686a b/Documentation/hwmon/via686a
index b82014cb7c53..a936fb3824b2 100644
--- a/Documentation/hwmon/via686a
+++ b/Documentation/hwmon/via686a
@@ -18,8 +18,9 @@ Authors:
18Module Parameters 18Module Parameters
19----------------- 19-----------------
20 20
21force_addr=0xaddr Set the I/O base address. Useful for Asus A7V boards 21force_addr=0xaddr Set the I/O base address. Useful for boards that
22 that don't set the address in the BIOS. Does not do a 22 don't set the address in the BIOS. Look for a BIOS
23 upgrade before resorting to this. Does not do a
23 PCI force; the via686a must still be present in lspci. 24 PCI force; the via686a must still be present in lspci.
24 Don't use this unless the driver complains that the 25 Don't use this unless the driver complains that the
25 base address is not set. 26 base address is not set.
@@ -63,3 +64,15 @@ miss once-only alarms.
63 64
64The driver only updates its values each 1.5 seconds; reading it more often 65The driver only updates its values each 1.5 seconds; reading it more often
65will do no harm, but will return 'old' values. 66will do no harm, but will return 'old' values.
67
68Known Issues
69------------
70
71This driver handles sensors integrated in some VIA south bridges. It is
72possible that a motherboard maker used a VT82C686A/B chip as part of a
73product design but was not interested in its hardware monitoring features,
74in which case the sensor inputs will not be wired. This is the case of
75the Asus K7V, A7V and A7V133 motherboards, to name only a few of them.
76So, if you need the force_addr parameter, and end up with values which
77don't seem to make any sense, don't look any further: your chip is simply
78not wired for hardware monitoring.