---
name: "se"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/se"
---

# se(4)

SiS 190/191 10/100/1Gb Ethernet device

## NAME

**se** – SiS 190/191 10/100/1Gb Ethernet device

## SYNOPSIS

**se\* at pci?** **atphy\* at mii?** **brgphy\* at mii?** **eephy\* at mii?** **etphy\* at mii?** **rlphy\* at mii?**

## DESCRIPTION

The **se** driver provides support for the SiS190 Fast Ethernet controller integrated into the SiS965L and SiS966L southbridges, and the SiS191 Gigabit controller integrated into the SiS965 and SiS966 southbridges.

Both SiS 190 and SiS 191 embed an Ethernet MAC with external PHY. They use a bus master DMA and a scatter/gather descriptor scheme and include a 64-bit multicast hash filter.

The **se** driver supports the following media types:

- autoselect

  Enable autoselection of the media type and options. The user can manually override the autoselected mode by adding media options to the [hostname.if(5)](/hostname.if/5.md) file.

- 10baseT

  Set 10Mbps operation. The *mediaopt* option can also be used to select either *full-duplex* or *half-duplex* modes.

- 100baseTX

  Set 100Mbps (Fast Ethernet) operation. The *mediaopt* option can also be used to select either *full-duplex* or *half-duplex* modes.

- 1000baseSX

  Set 1000Mbps (Gigabit Ethernet) on fiber operation. Only *full-duplex* mode is supported at this speed.

- 1000baseT

  Set 1000Mbps (Gigabit Ethernet) on copper operation.

The **se** driver supports the following media options:

- full-duplex

  Force full duplex operation.

- half-duplex

  Force half duplex operation.

For more information on configuring this device, see [ifconfig(8)](/ifconfig/8.md).

## DIAGNOSTICS

- se0: EEPROM read timeout

  The driver could not read the controller's MAC address from its EEPROM.

- se0: invalid EEPROM signature

  The driver could not find the expected EEPROM signature and could not read the controller's MAC address.

- se0: Could not find PCI-ISA bridge

  The driver could not read the controller's MAC address from the CMOS memory connected to the PCI-ISA bridge.

- se0: PHY read timeout

  The driver could not read data from the PHY.

- se0: PHY write timeout

  The driver could not write data to the PHY.

- se0: watchdog timeout

  The device has stopped responding to the network, or there is a problem with the network connection (cable).

## SEE ALSO

[arp(4)](/arp/4.md), [atphy(4)](/atphy/4.md), [brgphy(4)](/brgphy/4.md), [eephy(4)](/eephy/4.md), [etphy(4)](/etphy/4.md), [ifmedia(4)](/ifmedia/4.md), [intro(4)](/intro/4.md), [netintro(4)](/netintro/4.md), [pci(4)](/pci/4.md), [rlphy(4)](/rlphy/4.md), [hostname.if(5)](/hostname.if/5.md), [ifconfig(8)](/ifconfig/8.md)

## HISTORY

The **se** driver first appeared in OpenBSD 4.8.

## AUTHORS

The **se** driver was adapted by Alexander Pohoyda ⟨*alexander.pohoyda@gmx.net*⟩ from the [sis(4)](/sis/4.md) driver written by Bill Paul ⟨*wpaul@ee.columbia.edu*⟩, and ported to OpenBSD by Christopher Zimmermann ⟨*madroach@zakweb.de*⟩. SiS 191 support was added by Nikolay Denev ⟨*ndenev@gmail.com*⟩.