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+.\"	$NetBSD: ec.4,v 1.14 2017/07/03 21:30:58 wiz Exp $
+.\"
+.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
+.\" NASA Ames Research Center.
+.\"
+.\" 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 October 20, 1997
+.Dt EC 4
+.Os
+.Sh NAME
+.Nm ec
+.Nd driver for 3Com EtherLink II (3c503)
+.Tn ISA
+bus
+.Tn Ethernet
+cards
+.Sh SYNOPSIS
+.Cd "ec0 at isa? port 0x250 iomem 0xd8000 irq 9"
+.Sh DESCRIPTION
+The
+.Nm
+device driver supports 3Com EtherLink II (3c503)
+.Tn Ethernet
+cards for
+.Tn ISA
+bus which are based on the National Semiconductor DP8390/WD83C690
+.Tn Ethernet
+interface chips.
+.Sh MEDIA SELECTION
+The EtherLink II supports two media types on a single card.
+All support the
+.Tn AUI
+media type.
+The other media is either
+.Tn BNC
+or
+.Tn UTP
+behind a transceiver.
+Software cannot differentiate between
+.Tn BNC
+and
+.Tn UTP
+cards.
+.Pp
+To enable the AUI media, select the
+.Em 10base5
+or
+.Em aui
+media type with
+.Xr ifconfig 8 Ns 's
+.Cm media
+directive.
+To select the other media
+.Po
+.Tn BNC
+or
+.Tn UTP
+.Pc ,
+select the
+.Em 10base2
+or
+.Em bnc
+media type.
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "ec0: wildcarded IRQ is not allowed"
+.Pp
+The
+.Tn IRQ
+was wildcarded in the kernel configuration file.
+This is not supported.
+.It "ec0: invalid IRQ <n>, must be 3, 4, 5, or 9"
+.Pp
+An
+.Tn IRQ
+other than the above
+.Tn IRQ
+values was specified in the kernel configuration file.
+The EtherLink II hardware only supports the above listed
+.Tn IRQ
+values.
+.It "ec0: failed to clear shared memory at offset <off>"
+.Pp
+The memory test was unable to clear shared the interface's shared memory
+region.
+This often indicates that the card is configured at a conflicting
+.Em iomem
+address.
+.It "ec0: warning - receiver ring buffer overrun"
+.Pp
+The DP8390
+.Tn Ethernet
+chip used by this board implements a shared-memory
+ring-buffer to store incoming packets.
+The 3c503 usually has only 8K bytes of shared memory.
+This is only enough room for about 4 full-size (1500 byte) packets.
+This can sometimes be a problem, especially on the original 3c503, because
+these boards' shared-memory access speed is quite slow; typically only
+about 1MB/second.
+The overhead of this slow memory access, and the fact that there
+is only room for 4 full-sized packets means that the ring-buffer
+will occasionally overrun.
+.Pp
+When an overrun occurs, the board must be reset to avoid a lockup
+problem in early revision DP8390
+.Tn Ethernet
+chips.
+Resetting the board causes all of the data in the ring-buffer to be
+lost, requiring the data to be retransmitted/received, congesting the board
+further.
+Because of this, maximum throughput on these boards is only about
+400-600K bytes per second.
+.Pp
+This problem is exacerbated by
+.Tn NFS
+because the 8-bit boards lack sufficient packet buffer memory to
+support the default 8K byte packets that
+.Tn NFS
+and other protocols use as their default.
+If these cards must be used
+with
+.Tn NFS ,
+use the
+.Xr mount_nfs 8
+.Fl \&r
+and
+.Fl \&w
+options in
+.Pa /etc/fstab
+to limit NFS's packet size.
+4K (4096) byte packets generally work.
+.El
+.Sh SEE ALSO
+.Xr ifmedia 4 ,
+.Xr intro 4 ,
+.Xr isa 4 ,
+.Xr ifconfig 8 ,
+.Xr mount_nfs 8