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35 .Nd synchronous Digi/Arnet device driver
43 driver supports the Digi/Arnet SYNC/570i ISA and PCI cards that is based on the
45 Both the 2 and 4 port cards are supported and auto detected.
49 sppp code is used for the link level layer.
51 default protocol used is PPP.
52 The Cisco HDLC protocol can be used by
58 Alternately, the driver can be compiled to support
62 Only one line for each card is needed in the kernel configuration file.
63 The first card's ports will be installed from ar0.
65 next card will continue where the first stopped, e.g.\& if the first card
66 is a two port card it will use ar0 and ar1.
67 The next card will then
70 The card only supports IRQ 3, 5, 7, 10, 11, 12 and 15.
72 The iomem area is a 16Kb block and must start at a 16Kb boundary.
74 If the kernel is compiled with
75 .Dv "options NETGRAPH"
76 then the sppp and Cisco HDLC modes are disabled (and the sppp driver
77 is unneeded), and this driver functions as a
79 node with a single hook named
81 Connecting to this hook enables the transmission of raw HDLC frames.
82 The node will have the same name as the device with ``sync_''
87 .It "ar%d: Warning illegal interrupt %d."
88 The card cannot use the specified interrupt.
89 Choose a different one.
100 device driver first appeared in
106 device driver was written by
107 .An John Hay Aq jhay@FreeBSD.org .
108 Netgraph support was added by
109 .An Julian Elischer Aq julian@FreeBSD.org .
111 At the moment only the V.35 and X.21 interfaces are tested.
113 may need tweaks to the clock selection code.
115 The code can probably stand some optimizing.
117 Please report bugs to
118 .Aq jhay@FreeBSD.org .