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Man Pages
DCONS(4) FreeBSD Kernel Interfaces Manual DCONS(4)

dcons
dumb console device driver

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"

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 console TTY and another is GDB port, then each port has an input channel and an output channel.

/dev/dcons
 
/etc/ttys
 

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 details.
If you want to use dcons as a gdb(1) port, add the following line into loader.conf(5):
dcons_gdb="1"

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

Hidetoshi Shimokawa <simokawa@FreeBSD.org>

This driver is currently under development.
January 26, 2008 FreeBSD 12.0-RELEASE

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