170 lines
4.9 KiB
Groff
170 lines
4.9 KiB
Groff
.\" $NetBSD: ec.4,v 1.7 1999/04/07 21:39:34 fair Exp $
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.\"
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.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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.\" NASA Ames Research Center.
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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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 October 20, 1997
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.Dt EC 4
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.Os
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.Sh NAME
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.Nm ec
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.Nd driver for 3Com Etherlink II (3c503)
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.Tn ISA
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bus
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.Tn Ethernet
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cards
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.Sh SYNOPSIS
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.Cd "ec0 at isa? port 0x250 iomem 0xd8000 irq 9"
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.Sh DESCRIPTION
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The
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.Nm
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device driver supports 3Com Etherlink II (3c503)
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.Tn Ethernet
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cards for
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.Tn ISA
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bus which are based on the National Semiconductor DP8390/WD83C690
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.Tn Ethernet
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interface chips.
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.Sh MEDIA SELECTION
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The Etherlink II supports two media types on a single card.
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All support the
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.Tn AUI
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media type.
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The other media is either
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.Tn BNC
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or
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.Tn UTP
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behind a transceiver.
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Software cannot differentiate between
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.Tn BNC
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and
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.Tn UTP
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cards.
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.Pp
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To enable the AUI media, select the
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.Em 10base5
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or
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.Em aui
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media type with
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.Xr ifconfig 8 's
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.Sq media
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directive.
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To select the other media
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.Po
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.Tn BNC
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or
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.Tn UTP
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.Pc ,
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select the
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.Em 10base2
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or
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.Em bnc
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media type.
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "ec0: wildcarded IRQ is not allowed"
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.Pp
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The
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.Tn IRQ
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was wildcarded in the kernel configuration file.
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This is not supported.
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.It "ec0: invalid IRQ <n>, must be 3, 4, 5, or 9"
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.Pp
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An
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.Tn IRQ
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other than the above
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.Tn IRQ
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values was specified in the kernel configuration file.
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The Etherlink II hardware only supports the above listed
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.Tn IRQ
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values.
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.It "ec0: failed to clear shared memory at offset <off>"
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.Pp
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The memory test was unable to clear shared the interface's shared memory
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region.
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This often indicates that the card is configured at a conflicting
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.Em iomem
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address.
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.It "ec0: warning - receiver ring buffer overrun"
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.Pp
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The DP8390
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.Tn Ethernet
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chip used by this board implements a shared-memory
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ring-buffer to store incoming packets.
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The 3c503 usually has only 8K bytes of shared memory.
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This is only enough room for about 4 full-size (1500 byte) packets.
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This can sometimes be a problem, especially on the original 3c503, because
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these boards' shared-memory access speed is quite slow; typically only
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about 1MB/second.
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The overhead of this slow memory access, and the fact that there
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is only room for 4 full-sized packets means that the ring-buffer
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will occassionally overrun.
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.Pp
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When an overrun occurrs, the board must be reset to avoid a lockup
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problem in early revision DP8390
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.Tn Ethernet
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chips.
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Resetting the board causes all of the data in the ring-buffer to be
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lost, requiring the data to be retransmitted/received, congesting the board
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further.
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Because of this, maximum throughput on these boards is only about
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400-600K bytes per second.
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.Pp
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This problem is exacerbated by
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.Tn NFS
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because the 8-bit boards lack sufficient packet buffer memory to
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support the default 8K byte packets that
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.Tn NFS
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and other protocols use as their default.
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If these cards must be used
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with
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.Tn NFS ,
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use the
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.Xr mount_nfs 8
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.Fl \&r
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and
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.Fl \&w
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options in
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.Pa /etc/fstab
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to limit NFS's packet size.
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4K (4096) byte packets generally work.
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.El
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.Sh SEE ALSO
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.Xr ifmedia 4 ,
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.Xr intro 4 ,
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.Xr isa 4 ,
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.Xr ifconfig 8 ,
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.Xr mount_nfs 8
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