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SR(4)		       BSD/i386 Kernel Interfaces Manual		 SR(4)

NAME
     sr — synchronous RISCom/N2 / WANic 400/405 device driver

SYNOPSIS
     device sr

     pseudo-device sppp

DESCRIPTION
     The sr driver supports the WANic 400/405 PCI cards that are based on the
     HD64570 chip.

     The standard DragonFly 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 netgraph(4) (see
     below).

     The flags field is optional.  If it isn't specified, the driver will
     assume the following:

	   The card has 2 ports.

	   The clock for the serial ports is external and the transmitter uses
		   the same clock as the receiver.

     The flags are a bit field and can be used to force a different behaviour
     than the default.

	   0x01	   The card has only one port.

	   0x10	   Use separate external clocks for transmit and receive on
		   port 0.

	   0x40	   Use separate external clocks for transmit and receive on
		   port 1.

NUMBERING
     Only one line for each card is needed in the kernel configuration file.
     The first card's ports will be installed from sr0. The numbering of the
     next card will continue where the first stopped, eg. if the first card is
     a two port card it will use sr0 and sr1. The next card will then start at
     sr2.

     The card only supports IRQ 3, 4, 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_sr0.

FILES
     /sys/dev/netif/sr/if_sr.c
     /sys/dev/netif/sr/if_sr.h
     /sys/dev/netif/sr/if_sr_pci.c
     /sys/dev/netif/sr/if_srregs.h

DIAGNOSTICS
     sr%d: Warning illegal interrupt %d.  The card cannot use the specified
     interrupt.	 Choose a different one.

SEE ALSO
     ar(4), netgraph(4), netintro(4), ifconfig(8)

AUTHORS
     The sr device driver was written by John Hay ⟨jhay@FreeBSD.org⟩.

     Netgraph support was added by Julian Elischer ⟨julian@FreeBSD.org⟩.

BUGS
     At the moment only the X.21 interface is tested.  The others may need
     tweaks to the clock selection code.

     The code can probably stand some optimizing.

BSD				 July 4, 1996				   BSD

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