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 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 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 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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