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+.\"
+.\" Copyright (c) 2009 Marius Strobl <marius@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd March 24, 2012
+.Dt CAS 4
+.Os
+.Sh NAME
+.Nm cas
+.Nd Sun Cassini/Cassini+ and National Semiconductor DP83065 Saturn Gigabit Ethernet driver
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following lines in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device miibus"
+.Cd "device cas"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+if_cas_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+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.
+.Pp
+All controllers supported by the
+.Nm
+driver have TCP/UDP checksum offload capability for both receive and
+transmit, support for the reception and transmission of extended frames
+for
+.Xr vlan 4
+and an interrupt coalescing/moderation mechanism as well as a 512-bit
+multicast hash filter.
+.Pp
+The
+.Nm
+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
+.Xr ifconfig 8
+utility configures the adapter to receive and transmit Jumbo Frames.
+.Sh HARDWARE
+The chips supported by the
+.Nm
+driver are:
+.Pp
+.Bl -bullet -compact
+.It
+National Semiconductor DP83065 Saturn Gigabit Ethernet
+.It
+Sun Cassini Gigabit Ethernet
+.It
+Sun Cassini+ Gigabit Ethernet
+.El
+.Pp
+The
+following add-on cards are known to work with the
+.Nm
+driver at this time:
+.Pp
+.Bl -bullet -compact
+.It
+Sun GigaSwift Ethernet 1.0 MMF (Cassini Kuheen)
+(part no.\& 501-5524)
+.It
+Sun GigaSwift Ethernet 1.0 UTP (Cassini)
+(part no.\& 501-5902)
+.It
+Sun GigaSwift Ethernet UTP (GCS)
+(part no.\& 501-6719)
+.It
+Sun Quad GigaSwift Ethernet UTP (QGE)
+(part no.\& 501-6522)
+.It
+Sun Quad GigaSwift Ethernet PCI-X (QGE-X)
+(part no.\& 501-6738)
+.El
+.Sh NOTES
+On sparc64 the
+.Nm
+driver respects the
+.Va local-mac-address?
+system configuration variable which can be set in the Open Firmware boot
+monitor using the
+.Ic setenv
+command or by
+.Xr eeprom 8 .
+If set to
+.Dq Li false
+(the default), the
+.Nm
+driver will use the system's default MAC address for all of its devices.
+If set to
+.Dq Li true ,
+the unique MAC address of each interface is used if present rather than
+the system's default MAC address.
+.Pp
+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.
+.Sh SEE ALSO
+.Xr altq 4 ,
+.Xr miibus 4 ,
+.Xr netintro 4 ,
+.Xr vlan 4 ,
+.Xr eeprom 8 ,
+.Xr ifconfig 8
+.Sh HISTORY
+The
+.Nm
+device driver appeared in
+.Fx 8.0
+and
+.Fx 7.3 .
+It is named after the
+.Nm
+driver which first appeared in
+.Ox 4.1
+and supports the same set of controllers but is otherwise unrelated.
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Marius Strobl
+.Aq marius@FreeBSD.org
+based on the
+.Xr gem 4
+driver.