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$FreeBSD: head/share/man/man4/dcons.4 121468 2003-10-24 15:44:10Z simokawa $
.Dd February 11, 2003 .Dt DCONS 4 .Os .Sh NAME .Nm dcons .Nd dumb console device driver .Sh SYNOPSIS .Cd device dcons
p .Cd options DDB .Cd options ALT_BREAK_TO_DEBUGGER
p .Cd device firewire .Sh DESCRIPTION The .Nm device is the simple console device which just reads from and writes to an allocated buffer for input and output respectivly. It is no use by itself and it is supposed that the buffer is accessed via a bus like .Xr FireWire 4 for interaction.
p The buffer consists of 4 channels. There are 2 ports, one for console tty and other is GDB ports then each port has a input channel and a output channel. The physical address of the buffer is sometimes neccesary to acess the buffer. You can get the address by .Xr sysctl 8 or .Xr dmesg 8 . .Sh EXAMPLE If you want to run .Xr getty 8 on dcons, insert following line into .Xr /etc/ttys 5 and send a HUP signal to .Xr init 8 using .Xr kill 1 . d -literal -offset indent dcons "/usr/libexec/getty std.9600" vt100 on secure .Ed
p You can use either of the following commands to obtain physical address of the buffer. d -literal -offset indent % sysctl kern.dcons.paddr kern.dcons.paddr: 4732704 % dmesg | grep dcons: | tail -1 dcons: virtual 0xc0483720 physical 0x483720 quad 0x120dc8 .Ed
p In this example, the buffer is located at 4732704 in decimal and 0x483720 in hex.
p Once .Xr fwochi 4 device is initialized to allow physical access, the buffer can be accessed from another host via FireWire bus using .Xr fwchat 8 application. See .Xr fwchat 8 for more details.
p .Sh FILES l -tag -width indent -compact t Pa /dev/dcons t Pa /dev/dconsctl t Pa /etc/ttys .El .Sh SEE ALSO .Xr ddb 4 , .Xr firewire 4 , .Xr fwohci 4 , .Xr fwchat 8 , .Xr fwcontrol 8 , .Xr ttys 5 .Sh AUTHORS .An Hidetoshi Shimokawa Aq simokawa@FreeBSD.org .Sh BUGS This driver is still under development.
p