Copyright (c) 2004 Tom Rhodes
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$FreeBSD: stable/11/share/man/man4/cm.4 331882 2018-04-02 16:11:49Z brooks $

.Dd March 29, 2018 .Dt CM 4 .Os .Sh NAME .Nm cm .Nd "SMC Arcnet Ethernet device driver" .Sh SYNOPSIS To compile this driver into the kernel, place the following lines in your kernel configuration file: d -ragged -offset indent .Cd "device isa" .Cd "device cm" .Ed

p Alternatively, to load the driver as a module at boot time, place the following line in .Xr loader.conf 5 : d -literal -offset indent if_cm_load="YES" .Ed .Sh DEPRECATION NOTICE The .Nm driver is not present in .Fx 12.0 and later. .Sh DESCRIPTION The .Nm driver provides support for the .Tn Arcnet .Tn ISA network adapters.

p This driver also has quirks preset in the .Xr device.hints 5 file for card detection. .Sh HARDWARE The .Nm driver supports the following card models:

p l -bullet -compact t SMC90c26 t SMC90c56 t SMC90c66 in '56 compatibility mode. .El .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 DIAGNOSTICS The following driver specific error messages may be reported: l -diag t "reset: card reset, link addr = 0x%02x (cm%d)" The card is being reset and a new link address assigned. t "srint: restarted rx on buf cm%d" The rx buffer has been emptied and will be reset. .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 Mt 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 Mt trhodes@FreeBSD.org . The .Sx IMPLEMENTATION NOTES section was submitted by .An Max Khon Aq Mt 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 .Sx IMPLEMENTATION NOTES section is specific to all Arcnet devices (see

a sys/net/if_arcsubr.c ) and should be moved to a more generic location.