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CAS(4) Device Drivers Manual CAS(4)

casSun Cassini 10/100/Gigabit 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:

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

July 16, 2013 OpenBSD-6.4