NAME

     cas — Sun Cassini/Cassini+ and National Semiconductor DP83065 Saturn Gigabit Ethernet driver

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel
     configuration file:

           device miibus
           device cas

     Alternatively, to load the driver as a module at boot time, place the following line in
     loader.conf(5):

           if_cas_load="YES"

DESCRIPTION

     The cas driver provides support for the Sun Cassini/Cassini+ and National Semiconductor
     DP83065 Saturn Gigabit Ethernet controllers found on-board in Sun UltraSPARC machines and as
     add-on cards.

     All controllers supported by the cas driver have TCP/UDP checksum offload capability for
     both receive and transmit, support for the reception and transmission of extended frames for
     vlan(4) and an interrupt coalescing/moderation mechanism as well as a 512-bit multicast hash
     filter.

     The cas driver also supports Jumbo Frames (up to 9022 bytes), which can be configured via
     the interface MTU setting.  Selecting an MTU larger than 1500 bytes with the ifconfig(8)
     utility configures the adapter to receive and transmit Jumbo Frames.

HARDWARE

     The chips supported by the cas driver are:

     •   National Semiconductor DP83065 Saturn Gigabit Ethernet
     •   Sun Cassini Gigabit Ethernet
     •   Sun Cassini+ Gigabit Ethernet

     The following add-on cards are known to work with the cas driver at this time:

     •   Sun GigaSwift Ethernet 1.0 MMF (Cassini Kuheen) (part no. 501-5524)
     •   Sun GigaSwift Ethernet 1.0 UTP (Cassini) (part no. 501-5902)
     •   Sun GigaSwift Ethernet UTP (GCS) (part no. 501-6719)
     •   Sun Quad GigaSwift Ethernet UTP (QGE) (part no. 501-6522)
     •   Sun Quad GigaSwift Ethernet PCI-X (QGE-X) (part no. 501-6738)

NOTES

     On sparc64 the cas driver respects the local-mac-address? system configuration variable
     which can be set in the Open Firmware boot monitor using the setenv command or by eeprom(8).
     If set to “false” (the default), the cas driver will use the system's default MAC address
     for all of its devices.  If set to “true”, the unique MAC address of each interface is used
     if present rather than the system's default MAC address.

     Supported interfaces having their own MAC address include on-board versions on boards
     equipped with more than one Ethernet interface and all add-on cards.

SEE ALSO

     altq(4), miibus(4), netintro(4), vlan(4), eeprom(8), ifconfig(8)

HISTORY

     The cas device driver appeared in FreeBSD 8.0 and FreeBSD 7.3.  It is named after the cas
     driver which first appeared in OpenBSD 4.1 and supports the same set of controllers but is
     otherwise unrelated.

AUTHORS

     The cas driver was written by Marius Strobl <marius@FreeBSD.org> based on the gem(4) driver.