ar(4)

NAME

ar - synchronous Digi/Arnet device driver

SYNOPSIS

device ar0 at isa? port 0x300 irq 10 iomem 0xd0000
device ar1 at isa? port 0x310 irq 11 iomem 0xd0000
device sppp

DESCRIPTION

The ar driver supports the Digi/Arnet SYNC/570i ISA and PCI

cards that is
based on the HD64570 chip. Both the 2 and 4 port cards are

supported and
auto detected.

The standard FreeBSD sppp code is used for the link level

layer. The
default protocol used is PPP. The Cisco HDLC protocol can

be used by
adding link2 to ifconfig(8).

Alternately, the driver can be compiled to support net

graph(4) (see
below).

NUMBERING

Only one line for each card is needed in the kernel configu

ration file.
The first card's ports will be installed from ar0. The num

bering of the
next card will continue where the first stopped, e.g. if the

first card
is a two port card it will use ar0 and ar1. The next card

will then
start at ar2.

The card only supports IRQ 3, 5, 7, 10, 11, 12 and 15.

The iomem area is a 16Kb block and must start at a 16Kb

boundary.

NETGRAPH SUPPORT

If the kernel is compiled with options NETGRAPH then the

sppp and Cisco
HDLC modes are disabled (and the sppp driver is unneeded),

and this
driver functions as a netgraph(4) node with a single hook

named rawdata.
Connecting to this hook enables the transmission of raw HDLC

frames. The
node will have the same name as the device with ``sync_''

prepended,
e.g., sync_ar0.

FILES

/sys/i386/isa/ic/hd64570.h
/sys/i386/isa/if_arregs.h
/sys/i386/isa/if_ar.c
/sys/i386/isa/if_ar.h
/sys/pci/if_ar_p.c

DIAGNOSTICS

ar%d: Warning illegal interrupt %d. The card cannot use the

specified
interrupt. Choose a different one.

SEE ALSO

cx(4), netgraph(4), netintro(4), sr(4), ifconfig(8)

HISTORY

The ar device driver first appeared in FreeBSD 2.2.

AUTHORS

The ar device driver was written by John Hay <jhay@FreeB

SD.org>. Netgraph support was added by Julian Elischer <julian@FreeB

SD.org>.

BUGS

At the moment only the V.35 and X.21 interfaces are tested.

The others
may need tweaks to the clock selection code.

The code can probably stand some optimizing.

Please report bugs to <jhay@FreeBSD.org>.

BSD November 19, 1995

BSD