115 lines
3.3 KiB
Groff
115 lines
3.3 KiB
Groff
.\" $NetBSD: gem.4,v 1.8 2008/09/15 20:03:18 jdc Exp $
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.\"
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.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd September 15, 2008
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.Dt GEM 4
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.Os
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.Sh NAME
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.Nm gem
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.Nd ERI/GEM/GMAC Ethernet device driver
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.Sh SYNOPSIS
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.Cd "gem* at pci? dev ? function ?"
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.Cd "gem* at sbus? slot ? offset ?"
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.Pp
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Configuration of PHYs may also be necessary.
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See
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.Xr mii 4 .
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the GMac Ethernet hardware found mostly in
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the last Apple PowerBooks G3s and most G4-based Apple hardware, as
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well as many Sun UltraSPARCs.
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.Pp
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Cards supported by this driver include:
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.Bl -bullet -compact -offset indent
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.It
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Sun GEM gigabit ethernet (SX fibre variants)
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.It
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Sun ERI 10/100
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.It
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Apple GMAC
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.El
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.Pp
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The GEM family supports hardware checksumming to assist in computing
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IPv4 TCP checksums.
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The
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.Nm
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driver supports this feature of the chip.
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See
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.Xr ifconfig 8
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for information on how to enable this feature.
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.Sh SEE ALSO
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.Xr bmtphy 4 ,
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.Xr ifmedia 4 ,
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.Xr intro 4 ,
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.Xr mii 4 ,
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.Xr ifconfig 8
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.Rs
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.%T "GEM Gigabit Ethernet ASIC Specification"
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.%A Sun Microsystems
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.%O http://www.sun.com/processors/manuals/ge.pdf
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.Re
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.Rs
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.%T "Sbus GEM Specification"
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.%A Sun Microsystems
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.%O http://mediacast.sun.com/users/Barton808/media/gem_sbus-1.pdf
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.Re
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.Sh HISTORY
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The
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.Nm
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device driver appeared in
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.Nx 1.6 .
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Support for PCI SX fibre cards was added in
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.Nx 4.1 .
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Support for SBus SX fibre cards was added in
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.Nx 5.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written by
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.An Eduardo Horvath
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.Aq eeh@NetBSD.org .
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SX fibre support was added by
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.An Julian Coleman
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.Aq jdc@NetBSD.org .
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The man page was written by
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.An Thomas Klausner
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.Aq wiz@NetBSD.org .
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.Sh BUGS
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The hardware checksumming support does not support IPv4 UDP, although this was
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allowed prior to
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.Nx 5.0 .
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Also, the hardware IPv4 TCP receive checksumming support has bugs, so this is
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disabled.
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.Pp
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On the SX fibre variants of the hardware, the link will stay down if there is
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a duplex mismatch.
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Also, packet transmission may fail when in
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.Cm half-duplex
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mode.
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