126 lines
3.2 KiB
Groff
126 lines
3.2 KiB
Groff
.\" Copyright (c) 2003 Hidetoshi Shimokawa
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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. Redistributions 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
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 26, 2008
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.Dt DCONS 4
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.Os
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.Sh NAME
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.Nm dcons
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.Nd dumb console device driver
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following lines in your kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "options GDB"
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.Cd "device firewire"
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.Cd "device dcons"
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.Ed
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.Pp
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Alternatively, to load the driver as a module at boot time,
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place the following line in your kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "options GDB"
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.Ed
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.Pp
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and in
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.Xr loader.conf 5 :
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.Bd -ragged -offset indent
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dcons_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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device is a simple console device which just reads from and writes to
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an allocated buffer for input and output respectively.
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It is of no use by itself and it is supposed that the buffer is accessed
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via a bus like
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.Xr firewire 4
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or
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.Xr kvm 3
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for interaction.
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.Pp
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The buffer consists of 4 channels.
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There are 2 ports, one for the console TTY and another is GDB port,
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then each port has an input channel and an output channel.
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.Sh FILES
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.Bl -tag -width indent -compact
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.It Pa /dev/dcons
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.It Pa /etc/ttys
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.El
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.Sh EXAMPLES
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If you want to run
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.Xr getty 8
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on
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.Nm ,
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insert the following line into
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.Xr ttys 5
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and send a
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.Dv HUP
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signal to
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.Xr init 8
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using
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.Xr kill 1 .
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.Bd -literal -offset indent
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dcons "/usr/libexec/getty std.9600" vt100 on secure
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.Ed
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.Pp
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Once the
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.Xr fwohci 4
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device is initialized to allow physical access,
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the buffer can be accessed from another host via a
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.Xr firewire 4
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bus using the
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.Xr dconschat 8
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application.
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See
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.Xr dconschat 8
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for more details.
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.Pp
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If you want to use
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.Nm
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as a
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.Xr gdb 1
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port, add the following line into
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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dcons_gdb="1"
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.Ed
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.Sh SEE ALSO
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.Xr dcons_crom 4 ,
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.Xr ddb 4 ,
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.Xr firewire 4 ,
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.Xr fwohci 4 ,
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.Xr gdb 4 ,
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.Xr ttys 5 ,
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.Xr conscontrol 8 ,
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.Xr dconschat 8 ,
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.Xr fwcontrol 8
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.Sh AUTHORS
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.An Hidetoshi Shimokawa Aq Mt simokawa@FreeBSD.org
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.Sh BUGS
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This driver is
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.Ud
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