PIIXPM(4) | Device Drivers Manual | PIIXPM(4)

# NAME

`piixpm` — Intel PIIX SMBus controller

# SYNOPSIS

`piixpm* at pci?`
`iic* at piixpm?`

# DESCRIPTION

The `piixpm` driver provides support for the Intel PIIX and compatible Power Management controller. Only the SMBus host interface is supported and can be used with the iic(4) framework.

Supported chipsets:

- AMD Hudson-2, FCH (KERNCZ)
- ATI SB200, SB300, SB400, SB600, SB700, SB800
- Intel 82371AB (PIIX4), 82440MX
- ServerWorks OSB4, CSB5, CSB6, HT-1000, HT-1100
- SMSC Victory66

# SEE ALSO

iic(4), intro(4), pci(4)

# HISTORY

The `piixpm` driver first appeared in OpenBSD 3.7 to provide support for the power management (ACPI) timer. In OpenBSD 3.9, power management support was dropped in favor of acpitimer(4) and SMBus functionality was added.

# AUTHORS

The current `piixpm` driver was written by Alexander Yurchenko <grange@openbsd.org>.

# BUGS

The driver doesn't support I2C commands with a data buffer size of more than 2 bytes.

December 16, 2019 | Debian