106 lines
3.7 KiB
Groff
106 lines
3.7 KiB
Groff
.\" Copyright (c) 1990, 1991 The Regents of the University of California.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to Berkeley by
|
|
.\" the Systems Programming Group of the University of Utah Computer
|
|
.\" Science Department.
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" from: @(#)dca.4 5.2 (Berkeley) 3/27/91
|
|
.\" $Id: com.4,v 1.3 1995/02/17 09:43:38 jtc Exp $
|
|
.\"
|
|
.Dd August 6, 1993
|
|
.Dt COM 4 i386
|
|
.Os NetBSD 0.8a
|
|
.Sh NAME
|
|
.Nm com
|
|
.Nd
|
|
serial communications interface
|
|
.Sh SYNOPSIS
|
|
.Cd "com0 at isa? port" \&"IO_COM1\&" irq 4
|
|
.Cd "com1 at isa? port" \&"IO_COM2\&" irq 3
|
|
.Cd "com2 at ast? slave ? flags 1"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
driver provides support for NS8250-, NS16450-, and NS16550-based
|
|
.Tn EIA
|
|
.Tn RS-232C
|
|
.Pf ( Tn CCITT
|
|
.Tn V.28 )
|
|
communications interfaces. The NS8250 and NS16450 have single character
|
|
buffers, and the NS16550 has a 16 character buffer.
|
|
.Pp
|
|
Input and output for each line may set to one of following baud rates;
|
|
50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600,
|
|
19200, 38400, 57600, or 115200, or any other baud rate which is a factor
|
|
of 115200.
|
|
.Pp
|
|
If
|
|
.Dq flags 1
|
|
is specified, the
|
|
.Nm
|
|
driver will not set the MCR_IENABLE bit on the UART. This is mainly for
|
|
use on AST multiport boards, where the MCR_IENABLE bit is used to control
|
|
whether or not the devices use a shared interrupt.
|
|
.Sh FILES
|
|
.Bl -tag -width Pa
|
|
.It Pa /dev/tty00
|
|
.It Pa /dev/tty01
|
|
.It Pa /dev/tty02
|
|
.El
|
|
.Sh DIAGNOSTICS
|
|
.Bl -diag
|
|
.It com%d: %d silo overflows
|
|
The input
|
|
.Dq silo
|
|
has overflowed and incoming data has been lost.
|
|
.It com%d: weird interrupt: iir=%x
|
|
The device has generated an unexpected interrupt
|
|
with the code listed.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr ast 4 ,
|
|
.Xr rtfps 4 ,
|
|
.Xr tty 4
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
driver was originally derived from the
|
|
.Nm HP9000/300
|
|
.Nm dca
|
|
driver and is
|
|
.Ud
|
|
.Sh BUGS
|
|
Data loss is possible on busy systems with unbuffered UARTs at high speed.
|
|
.Pp
|
|
The name of this driver and the constants which define the locations
|
|
of the various serial ports are holdovers from
|
|
.Nm DOS .
|