Copyright (c) 2004 Tom Rhodes
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$FreeBSD: head/share/man/man4/cm.4 131822 2004-07-08 16:33:01Z trhodes $
.Dd June 21, 2004 .Dt CM 4 .Os .Sh NAME .Nm cm .Nd SMC Arcnet Ethernet device driver .Sh SYNOPSIS .Cd device isa .Cd device cm .Sh DESCRIPTION The .Nm driver provides support for the .Tn Arcnet .Tn ISA network adapters. This driver supports the following card models:
p l -item -compact t SMC90c26 t SMC90c56 t SMC90c66 in '56 compatibility mode. .El
p The .Nm driver also has quirks preset in the .Xr device.hints 5 file for card detection. .Sh IMPLEMENTATION NOTES When the .Va NOARP flag is set on the .Nm interface, it does not employ the address resolution protocol described in .Xr arp 4 to dynamically map between Internet and Ethernet addresses on the local network. Instead it uses the least significant 8 bits of the .Tn IP address as the hardware address like described in .Tn RFC 1051 and .Tn RFC 1201.
p With the .Dv IFF_LINK0 flag cleared .Tn IP/ARP/RARP encoding is done according to .Tn RFC 1201 that is, with Packet Header Definition Standard header and packet type 212 / 213. The .Tn MTU is normally 1500. The .Dv IFF_LINK0 flag is cleared by default.
p With the .Dv IFF_LINK0 flag set, .Tn IP and .Tn ARP encoding is done according to the deprecated .Tn RFC 1051 encoding, that is with simple header, packet type 240 / 241, and the .Tn MTU is 507.
p When switching between the two modes, use .Dl ifconfig interfacename down up to switch the .Tn MTU . .Sh ERRORS The following driver specific error messages may be reported: l -tag -width Er t Bq Er ENOENT May be returned if the device cannot allocate a port, memory resource, or IRQ with the given resource ID. t Bq Er EINVAL May be returned if the device is marked as down and is still running. This error may also be returned if the device is marked as up but is not running. .El .Sh SEE ALSO .Xr netintro 4 , .Xr watchdog 4 , .Xr device.hints 5 , .Xr ifconfig 8 , .Xr watchdog 8 .Sh HISTORY The .Nm device was ported from .Nx by .An Max Khon Aq fjoe@FreeBSD.org and first appeared in .Fx 4.6 . This manual page first appeared in .Fx 5.3 . .Sh AUTHORS This manual page was written by .An Tom Rhodes Aq trhodes@FreeBSD.org . The IMPLEMENTATION NOTES section was submitted by .An Max Khon Aq fjoe@FreeBSD.org and originated from .Nx . .Sh BUGS The .Nm driver code could do with a bit of improvement, it would be nice if some one could come along and take care of this.
p The IMPLEMENTATION NOTES section is specific to all Arcnet devices
q see Pa sys/net/if_arcsubr.c and should be moved to a more generic location.