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bottom of the manpages and order them consistently. GNU groff doesn't care about the ordering, and doesn't even mention CAVEATS and SECURITY CONSIDERATIONS as common sections and where to put them. Found by: mdocml lint run Reviewed by: ru
127 lines
3.5 KiB
Groff
127 lines
3.5 KiB
Groff
.\"-
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.\" Copyright (c) 2001 Miodrag Vallat.
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.\" Copyright (c) 2005 Marius Strobl <marius@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistribution of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" from: OpenBSD: pcons.4,v 1.4 2003/06/02 16:16:26 miod Exp
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.\" $FreeBSD$
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.\"
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.Dd June 18, 2005
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.Dt OFW_CONSOLE 4 sparc64
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.Os
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.Sh NAME
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.Nm ofw_console
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.Nd "Open Firmware console"
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.Sh SYNOPSIS
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.Cd "device ofw_console"
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.Cd "options OFWCONS_POLL_HZ=N"
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.Pp
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.Cd "options KDB"
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.Cd "options DDB"
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.Cd "options ALT_BREAK_TO_DEBUGGER"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides a simple text console,
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using the Open Firmware services for input and output.
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It will use the Open Firmware console devices set via the
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.Va input-device
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and
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.Va output-device
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variables.
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.Pp
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This driver is deprecated and only provided as a fallback console mechanism
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if the real console hardware can not be driven by
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.Fx .
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.Pp
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In case the
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.Nm
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console appears to work too slowly, its responsiveness probably can be improved
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by including
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.Cd "options OFWCONS_POLL_HZ=N" .
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When omitted,
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.Dv OFWCONS_POLL_HZ
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defaults to 4.
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For example, on
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.Tn Sun Ultra 2
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a value of 20 or higher works best.
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Too high values, on the other hand, can cause
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.Nm
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to unnecessarily consume CPU.
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.Sh FILES
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.Bl -tag -width ".Pa /dev/keyboard" -compact
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.It Pa /dev/console
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.It Pa /dev/keyboard
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terminal input device in case the console input device is the keyboard
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.It Pa /dev/screen
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terminal output device in case the console output device is the screen
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.It Pa /dev/tty[a-z]
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terminal device in case both the console input and output device is tty[a-z]
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.El
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.Sh SEE ALSO
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.Xr creator 4 ,
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.Xr machfb 4 ,
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.Xr syscons 4 ,
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.Xr uart 4 ,
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.Xr eeprom 8
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 5.0 .
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An "Benno Rice" Aq benno@FreeBSD.org .
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.Sh CAVEATS
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Since the Open Firmware will handle BREAK
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(or Stop-A)
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sequences before
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.Nm ,
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the preferred way to enter
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.Xr ddb 4
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when using
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.Nm
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is to include
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.Cd "options ALT_BREAK_TO_DEBUGGER"
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in a ddb-enabled kernel, and enter the alternate BREAK sequence
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(RETURN TILDE CTRL-b).
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.Sh BUGS
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The
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.Nm
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driver
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is not a real
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.Xr tty 4
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driver and is not MPSAFE.
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The
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.Nm
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driver also does not attach to the hardware resources it actually talks to.
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Therefore it cannot be included in the kernel together with real console
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hardware drivers
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like
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.Xr creator 4 ,
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.Xr machfb 4
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and
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.Xr uart 4 .
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