92 lines
2.7 KiB
Groff
92 lines
2.7 KiB
Groff
.\" $NetBSD: dz.4,v 1.2 2011/02/14 21:13:17 pooka Exp $
|
|
.\"
|
|
.\" Copyright (c) 2010 NetBSD Foundation, Inc.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This file is derived from work contributed by Microsoft Corporation.
|
|
.\"
|
|
.\" 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.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
|
|
.\"
|
|
.Dd July 17, 2010
|
|
.Dt DZ 4 emips
|
|
.Os
|
|
.Sh NAME
|
|
.Nm dz
|
|
.Nd
|
|
.Tn eMIPS
|
|
console serial device interface
|
|
.Sh SYNOPSIS
|
|
.Cd "dz* at ebus0 addr ?"
|
|
.Sh DESCRIPTION
|
|
This serial line provides a simple communication line with no modem control.
|
|
It is not adequate for
|
|
.Ux
|
|
dialup use.
|
|
.Pp
|
|
Normal I/O
|
|
control parameters for individual lines are managed by
|
|
.Xr ioctl 2
|
|
calls.
|
|
Line speeds may be initiated via
|
|
the
|
|
.Xr ttys 5
|
|
file,
|
|
.Xr stty 1
|
|
or
|
|
.Xr ifconfig 8
|
|
to name a few,
|
|
see
|
|
.Xr tty 4 .
|
|
.Pp
|
|
The
|
|
.Nm dz
|
|
driver monitors the rate of input on each board,
|
|
and switches between the use of character-at-a-time interrupts
|
|
and input silos.
|
|
While the silo is enabled during periods of high-speed input,
|
|
the driver polls for input 30 times per second.
|
|
.Sh FILES
|
|
.Bl -tag -width /dev/tty[0-9][0-9]xx -compact
|
|
.It Pa /dev/ttyD0
|
|
phys interface.
|
|
.El
|
|
.Sh DIAGNOSTICS
|
|
.Bl -diag
|
|
.It dz%d: silo overflow .
|
|
The 1 character input silo overflowed
|
|
before it could be serviced. This can happen if a hard error occurs
|
|
when the
|
|
.Tn CPU
|
|
is running with elevated priority, as the system will
|
|
then print a message on the console with interrupts disabled.
|
|
It is not serious.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr stty 1 ,
|
|
.Xr tty 4 ,
|
|
.Xr ttys 5 ,
|
|
.Xr getty 8
|
|
.Sh HISTORY
|
|
A
|
|
.Nm
|
|
driver appeared in
|
|
.Nx 6.0 .
|