VIASIO(4)

NAME
viasio - VIA VT1211 LPC Super I/O

SYNOPSIS
viasio* at isa? port 0x2e flags 0x0000
viasio* at isa? port 0x4e flags 0x0000

DESCRIPTION
The viasio driver provides support for the VIA VT1211 LPC Super I/O IC. The hardware monitoring and watchdog timer functions are currently supported.

The hardware monitor provides hardware monitoring capabilities to be used with the sysctl(8) interface. The following monitoring sensors are available:
Sensor | Units | Typical use
TEMP1 | uK | Pentium II type thermal diode
UCH1 | uK or uV DC | CPU temperature
UCH2 | uK or uV DC | System temperature
UCH3 | uK or uV DC | CPU core voltage
UCH4 | uK or uV DC | +5V
UCH5 | uK or uV DC | +12V
+3.3V | uV | Internal +3.3V
FAN1 | RPM | Fan tachometer
FAN2 | RPM | Fan tachometer

If the hardware monitor is not enabled by firmware, the driver can try to enable it if value 0x0001 is present in the flags. Note that enabling the hardware monitor can lead to unexpected results.

The watchdog timer provides a standard watchdog(4) interface. If the watchdog timer is not enabled by firmware, the driver can try to enable it if value 0x0002 is present in the flags.

SEE ALSO
intro(4), isa(4), watchdog(4), sensorsd(8), sysctl(8)

HISTORY
The viasio driver first appeared in OpenBSD 3.8.

AUTHORS
The viasio driver was written by Alexander Yurchenko <grange@openbsd.org>.