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VIASIO(4) Device Drivers Manual VIASIO(4)

viasio
VIA VT1211 LPC Super I/O

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

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
uK Pentium II type thermal diode
uK or uV DC CPU temperature
uK or uV DC System temperature
uK or uV DC CPU core voltage
uK or uV DC +5V
uK or uV DC +12V
uV Internal +3.3V
RPM Fan tachometer
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.

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

The viasio driver first appeared in OpenBSD 3.8.

The viasio driver was written by Alexander Yurchenko <grange@openbsd.org>.
July 16, 2013 OpenBSD-current