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+.\" $NetBSD: cas.4,v 1.5 2024/09/07 20:33:53 rillig Exp $
+.\"
+.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+.\"
+.Dd December 25, 2019
+.Dt CAS 4
+.Os
+.Sh NAME
+.Nm cas
+.Nd Cassini/Cassini+ (GigaSwift) Ethernet device driver
+.Sh SYNOPSIS
+.Cd "cas* at pci? dev ? function ?"
+.Pp
+Configuration of PHYs may also be necessary.
+See
+.Xr mii 4 .
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the Sun Cassini and Cassini+ (GigaSwift) and the
+National Semiconductor Saturn Ethernet hardware found in Sun UltraSPARC machines
+and Sun GigaSwift PCI cards.
+.Pp
+Cards supported by this driver include:
+.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 SEE ALSO
+.Xr brgphy 4 ,
+.Xr gentbi 4 ,
+.Xr gphyter 4 ,
+.Xr ifmedia 4 ,
+.Xr intro 4 ,
+.Xr mii 4 ,
+.Xr ifconfig 8
+.Rs
+.%T "Cassini+ ASIC Specification"
+.%A Sun Microsystems
+.%U https://web.archive.org/web/20090701014334/http://www.sun.com/processors/manuals/cs_plus.pdf
+.Re
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Ox 4.1 .
+.Nx
+support was added in
+.Nx 6.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written for
+.Ox
+by
+.An Mark Kettenis
+.Aq kettenis@openbsd.org ,
+based on the
+.Xr gem 4
+driver, and ported to
+.Nx
+by
+.An Julian Coleman
+.Aq jdc@NetBSD.org .
+.Sh BUGS
+The
+.Nm
+driver does not support any of the advanced features of the Cassini chip.
+.Pp
+On the SX fibre variants of the hardware, the link may stay down if media
+options apart from
+.Dv autoselect
+are chosen.