176 lines
4.0 KiB
Groff
176 lines
4.0 KiB
Groff
.\"
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.\" Copyright (c) 2004 Tom Rhodes
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 16,2005
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.Dt CM 4
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.Os
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.Sh NAME
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.Nm cm
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.Nd "SMC Arcnet Ethernet device driver"
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.Sh SYNOPSIS
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To compile support for the
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.Nm
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driver into your kernel, place the following lines in
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your kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device isa"
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.Cd "device cm"
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.Ed
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.Pp
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Alternatively, to load the
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.Xr cm 4
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driver at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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if_cm_load="YES"
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.Ed
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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
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.Tn Arcnet
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.Tn ISA
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network adapters.
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.Pp
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This driver also has quirks preset in the
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.Xr device.hints 5
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file for card detection.
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.Sh HARDWARE
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The
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.Nm
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driver supports the following
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card models:
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.Pp
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.Bl -bullet -compact
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.It
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SMC90c26
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.It
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SMC90c56
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.It
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SMC90c66 in '56 compatibility mode.
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.El
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.Sh IMPLEMENTATION NOTES
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When the
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.Va NOARP
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flag is set on the
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.Nm
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interface,
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it does not employ the address resolution protocol described in
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.Xr arp 4
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to dynamically map between Internet and Ethernet addresses on
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the local network.
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Instead it uses the least significant 8 bits of the
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.Tn IP
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address as the hardware address
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like described in
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.Tn RFC
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1051
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and
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.Tn RFC
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1201.
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.Pp
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With the
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.Dv IFF_LINK0
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flag cleared
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.Tn IP/ARP/RARP
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encoding is done according to
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.Tn RFC
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1201
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that is, with Packet Header Definition Standard header and packet type
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212 / 213.
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The
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.Tn MTU
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is normally 1500.
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The
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.Dv IFF_LINK0
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flag is cleared by default.
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.Pp
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With the
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.Dv IFF_LINK0
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flag set,
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.Tn IP
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and
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.Tn ARP
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encoding is done according to the deprecated
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.Tn RFC
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1051 encoding, that is with simple header, packet type 240 / 241,
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and the
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.Tn MTU
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is 507.
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.Pp
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When switching between the two modes, use
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.Dl ifconfig interfacename down up
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to switch the
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.Tn MTU .
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.Sh DIAGNOSTICS
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The following driver specific error messages
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may be reported:
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.Bl -diag
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.It "reset: card reset, link addr = 0x%02x (cm%d)"
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The card is being reset and a new link address assigned.
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.It "srint: restarted rx on buf cm%d"
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The rx buffer has been emptied and will be reset.
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.El
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.Sh SEE ALSO
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.Xr netintro 4 ,
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.Xr watchdog 4 ,
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.Xr device.hints 5 ,
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.Xr ifconfig 8 ,
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.Xr watchdog 8
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.Sh HISTORY
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The
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.Nm
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device was ported from
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.Nx
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by
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.An Max Khon Aq fjoe@FreeBSD.org
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and first appeared in
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.Fx 4.6 .
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This manual page first appeared in
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.Fx 5.3 .
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.Sh AUTHORS
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This manual page was written by
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.An Tom Rhodes Aq trhodes@FreeBSD.org .
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The
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.Sx IMPLEMENTATION NOTES
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section was submitted by
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.An Max Khon Aq fjoe@FreeBSD.org
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and originated from
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.Nx .
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.Sh BUGS
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The
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.Nm
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driver code could do with a bit of improvement,
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it would be nice if some one could come along and take care of this.
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.Pp
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The
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.Sx IMPLEMENTATION NOTES
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section is specific to all Arcnet
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devices (see
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.Pa sys/net/if_arcsubr.c )
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and should be moved to a more generic location.
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