IT(4) - Device Drivers Manual

IT(4) - Device Drivers Manual #

IT(4) - Device Drivers Manual

NAME #

it - ITE IT87xxF and SiS SiS950 temperature, voltage, and fan sensor with watchdog timer

SYNOPSIS #

it* at isa? port 0x2e it* at isa? port 0x4e

DESCRIPTION #

The it driver provides support for the ITE IT8705F, IT8712F, IT8716F, IT8718F, IT8720F, IT8726F, IT8728F, IT8772F and SiS SiS950 hardware monitors and watchdog(4) timer to be used with the sysctl(8) interface.

Most supported devices possess 17 sensors:

**Sensor** **Units** **Typical Use**  
`temp0`   uK       CPU Temperature  
`temp1`   uK       Motherboard Temperature  
`temp2`   uK       Unused  
`fan0`    RPM      CPU Fan  
`fan1`    RPM      Chassis Fan  
`fan2`    RPM      Power Fan  
`fan3`    RPM      Unused  
`fan4`    RPM      Unused  
`volt0`   uV DC    Core voltage  
`volt1`   uV DC    Core voltage  
`volt2`   uV DC    +3.3V  
`volt3`   uV DC    +5V  
`volt4`   uV DC    +12V  
`volt5`   uV DC    -12V  
`volt6`   uV DC    -5V  
`volt7`   uV DC    +5VSB  
`volt8`   uV DC    VBAT

SEE ALSO #

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

HISTORY #

The it driver first appeared in OpenBSD 3.4.

AUTHORS #

The it driver was originally written for OpenBSD 3.4 by Julien Bordet <zejames@greyhats.org>, and completely rewritten for OpenBSD 4.3 by Oleg Safiullin <form@pdp-11.org.ru>.

BUGS #

Watchdog timer functionality is not supported for ITE IT8705 or SiS SiS950 chips. For older IT8712 chips, watchdog timeout values of more than 255 seconds are rounded up to the nearest minute.

OpenBSD 7.5 - September 10, 2015