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+.\" $NetBSD: gem.4,v 1.12 2018/06/02 19:08:34 sevan Exp $
+.\"
+.\" Copyright (c) 2002 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 June 2, 2018
+.Dt GEM 4
+.Os
+.Sh NAME
+.Nm gem
+.Nd ERI/GEM/GMAC Ethernet device driver
+.Sh SYNOPSIS
+.Cd "gem* at pci? dev ? function ?"
+.Cd "gem* at sbus? slot ? offset ?"
+.Pp
+Configuration of PHYs may also be necessary.
+See
+.Xr mii 4 .
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the GMac Ethernet hardware found mostly in
+the last Apple PowerBooks G3s and most G4-based Apple hardware, as
+well as many Sun UltraSPARCs.
+.Pp
+Cards supported by this driver include:
+.Bl -bullet -compact -offset indent
+.It
+Sun GEM Gigabit Ethernet (SX fibre variants)
+.It
+Sun ERI 10/100
+.It
+Apple GMAC
+.El
+.Pp
+The GEM family supports hardware checksumming to assist in computing
+IPv4 TCP checksums.
+The
+.Nm
+driver supports this feature of the chip.
+See
+.Xr ifconfig 8
+for information on how to enable this feature.
+.Sh SEE ALSO
+.Xr bmtphy 4 ,
+.Xr ifmedia 4 ,
+.Xr intro 4 ,
+.Xr makphy 4 ,
+.Xr mii 4 ,
+.Xr ifconfig 8
+.Rs
+.%T "GEM Gigabit Ethernet ASIC Specification"
+.%A Sun Microsystems
+.%U http://www.sun.com/processors/manuals/ge.pdf
+.Re
+.Rs
+.%T "Sbus GEM Specification"
+.%A Sun Microsystems
+.%U http://mediacast.sun.com/users/Barton808/media/gem_sbus-1.pdf
+.Re
+.Sh HISTORY
+The
+.Nm
+device driver appeared in
+.Nx 1.6 .
+Support for PCI SX fibre cards was added in
+.Nx 5.0 .
+Support for SBus SX fibre cards was added in
+.Nx 5.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Eduardo Horvath
+.Aq eeh@NetBSD.org .
+SX fibre support was added by
+.An Julian Coleman
+.Aq jdc@NetBSD.org .
+The man page was written by
+.An Thomas Klausner
+.Aq wiz@NetBSD.org .
+.Sh BUGS
+The hardware checksumming support does not support IPv4 UDP, although this was
+allowed prior to
+.Nx 5.0 .
+Also, the hardware IPv4 TCP receive checksumming support has bugs, so this is
+disabled.
+.Pp
+On the SX fibre variants of the hardware, the link will stay down if there is
+a duplex mismatch.
+Also, packet transmission may fail when in
+.Cm half-duplex
+mode.