VIASIO(4) | Device Drivers Manual | 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>.

July 16, 2013 | Debian