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CAS(4) Device Drivers Manual CAS(4)

casSun Cassini 10/100/1Gb Ethernet device

cas* at pci?
brgphy* at mii?
gentbi* at mii?
nsgphy* at mii?

The cas driver provides support for various NICs based on the Sun Cassini/Cassini+ and National Semiconductor Saturn Ethernet controller chips, including the following:

It uses an internal or external PHY or an external 10-bit interface.

The cas driver supports several media types, which are selected via the ifconfig(8) command. The supported media types are:

Attempt to autoselect the media type (default)
1000baseT mediaopt full-duplex
Use 1000baseT on copper, full duplex
1000baseT mediaopt half-duplex
Use 1000baseT on copper, half duplex
1000baseSX mediaopt full-duplex
Use 1000baseSX on fiber, full duplex
1000baseSX mediaopt half-duplex
Use 1000baseSX on fiber, half duplex
100baseTX mediaopt full-duplex
Use 100baseTX, full duplex
100baseTX mediaopt half-duplex
Use 100baseTX, half duplex
10baseT mediaopt full-duplex
Use 10baseT, full duplex
10baseT mediaopt half-duplex
Use 10baseT, half duplex

arp(4), brgphy(4), gentbi(4), ifmedia(4), inet(4), intro(4), netintro(4), nsgphy(4), hostname.if(5), ifconfig(8)

OpenBSD support for cas first appeared in OpenBSD 4.1.

The cas driver was written by Mark Kettenis <> based on the gem(4) driver.

The cas driver does not yet use many of the advanced features the Cassini chip offers.

March 21, 2022 OpenBSD-current