Manual Pages  — OFW_CONSOLE

ofw_console – Open Firmware console

SYNOPSIS DESCRIPTION FILES SEE ALSO HISTORY AUTHORS CAVEATS BUGS

cpu AIM options OFWCONS_POLL_HZ=N

options KDB options DDB options ALT_BREAK_TO_DEBUGGER

The ofw_console driver provides a simple text console, using the Open Firmware services for input and output. It will use the Open Firmware console devices set via the input-device and output-device variables.

This driver is deprecated and only provided as a fallback console mechanism if the real console hardware can not be driven by FreeBSD .

In case the ofw_console console appears to work too slowly, its responsiveness probably can be improved by including options OFWCONS_POLL_HZ=N . When omitted, OFWCONS_POLL_HZ defaults to 4. For example, on Sun Ultra 2 a value of 20 or higher works best. Too high values, on the other hand, can cause ofw_console to unnecessarily consume CPU.

/dev/console /dev/keyboard
	terminal input device in case the console input device is the keyboard
/dev/screen	terminal output device in case the console output device is the screen
/dev/tty[a-z]
	terminal device in case both the console input and output device is tty[a-z]

The ofw_console driver first appeared in FreeBSD 5.0 .

The ofw_console driver was written by Benno Rice <Mt benno@FreeBSD.org>.

The ofw_console driver also not attach to the hardware resources it actually talks to.