0cdfc33805
Back when I wrote openfirm.4, sparc64 was the only architecture to include the corresponding device. However, nowadays all supported architectures will provied this Open Firmware interface, even x86 when built with FDT support. As for ofw_console(4), powerpc actually was the first architecture to ship it but we'll probably not see another consumer in future. This partially reverts 702547720ca01437081fb1b6f9eb281c9541021b and r357794 respectively, adjusting paths and content as appropriate.
112 lines
3.3 KiB
Groff
112 lines
3.3 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 January 16, 2021
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.Dt OFW_CONSOLE 4 powerpc
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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 "cpu AIM"
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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 akbd 4 ,
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.Xr powermac_nvram 4 ,
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.Xr vt 4
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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 Mt 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 also not attach to the hardware resources it actually talks to.
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