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+.\" Copyright (c) 2003-2004 Roman Kurakin <rik@cronyx.ru>
+.\" Copyright (c) 2003-2004 Cronyx Engineering
+.\" All rights reserved.
+.\"
+.\" This software is distributed with NO WARRANTIES, not even the implied
+.\" warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+.\"
+.\" Authors grant any other persons or organisations a permission to use,
+.\" modify and redistribute this software in source and binary forms,
+.\" as long as this message is kept with the software, all derivative
+.\" works or modified versions.
+.\"
+.\" Cronyx Id: cx.4,v 1.1.2.6 2004/06/21 17:56:40 rik Exp $
+.\" $FreeBSD$
+.\"
+.Dd July 16, 2005
+.Dt CX 4 i386
+.Os
+.Sh NAME
+.Nm cx
+.Nd "driver for synchronous/asynchronous Cronyx Sigma WAN adapters"
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following line in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device cx"
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+if_cx_load="YES"
+.Ed
+.Pp
+Additional options:
+.Cd "device sppp"
+.Cd "options NETGRAPH"
+.Cd "options NETGRAPH_CRONYX"
+.Pp
+In
+.Pa /boot/device.hints :
+.Cd hint.cx.0.at="isa"
+.Cd hint.cx.0.port="0x240"
+.Cd hint.cx.0.irq="15"
+.Cd hint.cx.0.drq="7"
+.Sh DESCRIPTION
+The
+.Nm
+driver needs either
+.Xr sppp 4
+or
+.Xr netgraph 4 .
+Which one to use is determined by the
+.Dv NETGRAPH_CRONYX
+option.
+If this option is present in your kernel configuration file, the
+.Nm
+driver will be compiled with
+.Xr netgraph 4
+support.
+Otherwise, it will be compiled with
+.Xr sppp 4
+support.
+.Pp
+The base I/O port address specified in
+.Pa /boot/device.hints
+must match the port address set by the jumpers on the board.
+The DMA I/O channel and interrupt request numbers are configured
+by software at adapter initialization.
+Legal values are:
+.Pp
+.Bl -tag -compact -width Port:
+.It Port :
+0x240, 0x260, 0x280, 0x300, 0x320, 0x380
+.It IRQ :
+3, 5, 7, 10, 11, 12, 15
+.It DMA :
+5, 6, 7
+.El
+.Pp
+The
+.Nm
+driver supports autodetection.
+As for all non-PNP hardware, using
+autodetection could lead to some potential problems with other devices during
+the hardware detection process.
+It is always better to specify hardware resources manually.
+.Pp
+Refer to
+.Xr sconfig 8
+for information about the
+.Nm
+adapter configuration.
+.Sh HARDWARE
+The
+.Nm
+driver supports the following cards:
+.Pp
+.Bl -bullet -compact
+.It
+Cronyx Sigma-22, Sigma-24
+.It
+Cronyx Sigma-100
+.It
+Cronyx Sigma-400, Sigma-401, Sigma-404, Sigma-410, Sigma-440
+.It
+Cronyx Sigma-500
+.It
+Cronyx Sigma-703
+.It
+Cronyx Sigma-800, Sigma-801, Sigma-810, Sigma-840
+.El
+.Sh SEE ALSO
+.Xr cp 4 ,
+.Xr ctau 4 ,
+.Xr sppp 4 ,
+.Xr ifconfig 8 ,
+.Xr sconfig 8 ,
+.Xr spppcontrol 8
+.Sh HISTORY
+The
+.Nm
+driver was updated in
+.Fx 5.2
+and
+.Fx 4.10 .
+In most of the previous versions of
+.Fx
+the
+.Nm
+driver is out of date.
+The
+.Nm
+driver for previous versions of
+.Fx
+is available from
+.Pa http://www.cronyx.ru/ .