1.\" $NetBSD: ioat.4,v 1.6 2009/04/10 15:26:14 joerg Exp $ 2.\" 3.\" Copyright (c) 1990, 1991 The Regents of the University of California. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the Systems Programming Group of the University of Utah Computer 8.\" Science Department. 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.\" from: NetBSD: boca.4,v 1.3 1999/03/16 01:19:15 garbled Exp 34.\" from: @(#)dca.4 5.2 (Berkeley) 3/27/91 35.\" from: Id: com.4,v 1.1 1993/08/06 11:19:07 cgd Exp 36.\" 37.Dd January 24, 2000 38.Dt IOAT 4 39.Os 40.Sh NAME 41.Nm ioat 42.Nd 43multiplexing serial communications interface 44.Sh SYNOPSIS 45For 6-port BOCA IOAT66 board: 46.Pp 47.Cd "ioat0 at isa? port 0x220 irq 5" 48.Cd "com2 at ioat? slave ?" 49.Cd "com3 at ioat? slave ?" 50.Cd "com4 at ioat? slave ?" 51.Cd "com5 at ioat? slave ?" 52.Cd "com6 at ioat? slave ?" 53.Cd "com7 at ioat? slave ?" 54.Sh DESCRIPTION 55The 56.Nm ioat 57driver provides support for BOCA Research IOAT66 58boards that multiplex together up to six 59.Tn EIA 60.Tn RS-232C 61.Pf ( Tn CCITT 62.Tn V.28 ) 63communications interfaces. 64.Pp 65Each 66.Nm 67device is the master device for up to six 68.Nm com 69devices. The kernel configuration specifies these 70.Nm com 71devices as slave devices of the 72.Nm 73device, as shown in the synopsis. The slave ID given for each 74.Nm com 75device determines which bit in the interrupt multiplexing register is 76tested to find interrupts for that device. 77The 78.Tn port 79specification for the 80.Nm 81device is used to compute the base addresses for the 82.Nm com 83subdevices. The port for the interrupt multiplexing register is not 84programmable. 85.Sh FILES 86.Bl -tag -width Pa 87.It Pa /dev/tty?? 88.El 89.Sh SEE ALSO 90.Xr com 4 91.Sh HISTORY 92The 93.Nm 94driver was adapted from the boca driver by Michael Richardson. 95