Add manual page for Cronyx/Tau-ISA device driver.

Approved by:	imp (mentor)

share/man/man4/man4.i386/ct.4

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+.\" Copyright (c) 2004 Roman Kurakin <rik@cronyx.ru>
+.\" Copyright (c) 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: ct.4,v 1.1.2.2 2004/02/26 18:47:18 rik Exp $
+.\" $FreeBSD$
+.\"
+.Dd February 26, 2004
+.Dt CT 4 i386
+.Os
+.Sh NAME
+.Nm ct
+.Nd driver for synchronous Cronyx-Tau WAN adapters
+.Sh SYNOPSIS
+.Cd "device ctau"
+.Pp
+Additional options:
+.Cd "device sppp"
+.Cd "options NETGRAPH"
+.Cd "options NETGRAPH_CRONYX"
+.Pp
+In
+.Pa /boot/device.hints :
+.Cd hint.ctau.0.at="isa"
+.Cd hint.ctau.0.port="0x240"
+.Cd hint.ctau.0.irq="15"
+.Cd hint.ctau.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 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 :
+0x200, 0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x2e0,
+0x300, 0x320, 0x340, 0x360, 0x380, 0x3a0, 0x3c0, 0x3e0
+.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 SEE ALSO
+.Xr cx 4 , 
+.Xr sppp 4 , 
+.Xr ifconfig 8 , 
+.Xr sconfig 8 , 
+.Xr spppcontrol 8
+.Sh HISTORY
+The
+.Nm
+driver was added in
+.Fx 5.3 .
+The
+.Nm
+driver for previous versions of
+.Fx
+is available from
+.Pa http://www.cronyx.ru/ .