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DCONS(4)		    Kernel Interfaces Manual		      DCONS(4)

NAME
       dcons --	dumb console device driver

SYNOPSIS
       To  compile  this  driver into the kernel, place	the following lines in
       your kernel configuration file:

	     options GDB
	     device firewire
	     device dcons

       Alternatively, to load the driver as a module at	boot time,  place  the
       following line in your kernel configuration file:

	     options GDB

       and in loader.conf(5):

	     dcons_load="YES"

DESCRIPTION
       The  dcons  device is a simple console device which just	reads from and
       writes to an allocated buffer for input and output respectively.	 It is
       of no use by itself and it is supposed that the buffer is accessed  via
       a bus like firewire(4) or kvm(3)	for interaction.

       The buffer consists of 4	channels.  There are 2 ports, one for the con-
       sole  TTY  and another is GDB port, then	each port has an input channel
       and an output channel.

FILES
       /dev/dcons
       /etc/ttys

EXAMPLES
       If you want to run getty(8) on dcons, insert the	 following  line  into
       ttys(5) and send	a HUP signal to	init(8)	using kill(1).

	     dcons   "/usr/libexec/getty std.115200" vt100   on	 secure

       Once  the fwohci(4) device is initialized to allow physical access, the
       buffer can be accessed from another host	via a  firewire(4)  bus	 using
       the dconschat(8)	application.  See dconschat(8) for more	details.

       If  you	want  to use dcons as a	gdb(1) (ports/devel/gdb) port, add the
       following line into loader.conf(5):

	     dcons_gdb="1"

SEE ALSO
       dcons_crom(4),  ddb(4),	firewire(4),   fwohci(4),   gdb(4),   ttys(5),
       conscontrol(8), dconschat(8), fwcontrol(8)

AUTHORS
       Hidetoshi Shimokawa <simokawa@FreeBSD.org>

BUGS
       This driver is currently	under development.

FreeBSD	14.3		       January 26, 2008			      DCONS(4)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=dcons&sektion=4&manpath=FreeBSD+14.3-RELEASE+and+Ports>

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