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 respec
tively. 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 console TTY and another is GDB port, then each port has an in
put 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.9600" 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 de
tails.

SEE ALSO

dcons_crom(4), ddb(4), firewire(4), fwohci(4), ttys(5),
dconschat(8),
fwcontrol(8)

AUTHORS

Hidetoshi Shimokawa <simokawa@FreeBSD.org>

BUGS

This driver is currently under development.
BSD October 7, 2005
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