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cm (4)
cm (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
>> cm (4) ( FreeBSD man: Специальные файлы /dev/* )
BSD mandoc
NAME
cm
- SMC Arcnet Ethernet device driver
SYNOPSIS
To compile this driver into the kernel,
place the following lines in your kernel
configuration file:
device isadevice cm
Alternatively, to load the driver as a
module at boot time, place the following line in
loader.conf5:
if_cm_load="YES"
DESCRIPTION
The
driver provides support for the
ArcnetISA
network adapters.
This driver also has quirks preset in the
device.hints5
file for card detection.
HARDWARE
The
driver supports the following
card models:
SMC90c26
SMC90c56
SMC90c66 in '56 compatibility mode.
IMPLEMENTATION NOTES
When the
NOARP
flag is set on the
interface,
it does not employ the address resolution protocol described in
arp(4)
to dynamically map between Internet and Ethernet addresses on
the local network.
Instead it uses the least significant 8 bits of the
IP
address as the hardware address
like described in
RFC
1051
and
RFC
1201.
With the
IFF_LINK0
flag cleared
IP/ARP/RARP
encoding is done according to
RFC
1201
that is, with Packet Header Definition Standard header and packet type
212 / 213.
The
MTU
is normally 1500.
The
IFF_LINK0
flag is cleared by default.
With the
IFF_LINK0
flag set,
IP
and
ARP
encoding is done according to the deprecated
RFC
1051 encoding, that is with simple header, packet type 240 / 241,
and the
MTU
is 507.
When switching between the two modes, use
ifconfig interfacename down up
to switch the
MTU
DIAGNOSTICS
The following driver specific error messages
may be reported:
"reset: card reset, link addr = 0x%02x (cm%d)"
The card is being reset and a new link address assigned.
The
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 .
AUTHORS
This manual page was written by
An Tom Rhodes Aq trhodes@FreeBSD.org .
The
Sx IMPLEMENTATION NOTES
section was submitted by
An Max Khon Aq fjoe@FreeBSD.org
and originated from
Nx .
BUGS
The
driver code could do with a bit of improvement,
it would be nice if some one could come along and take care of this.
The
Sx IMPLEMENTATION NOTES
section is specific to all Arcnet
devices (see
sys/net/if_arcsubr.c
and should be moved to a more generic location.
