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 dconsAlternatively, to load the driver as a module at boot time, place the following line in your kernel configuration file:
options GDBand in loader.conf(5):
DESCRIPTION
Thedcons 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.
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 details.
If you want to use dcons as a
gdb(1) 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.