BIOS Quick Reference • CC5-RAVE
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EKF Elektronik GmbH * Philipp-Reis-Str. 4 * D-59065 HAMM (Germany)
Tel. +49 (0)2381/6890-0 * Fax. +49 (0)2381/6890-90 * E-Mail [email protected] * Internet http://www.ekf.de
the debugger, then DOS will still be waiting for its command, and will not prompt again until
you press ENTER again. The debugger can also be entered from the Setup Screen System, and as
a boot activity (see “Basic CMOS Configuration Screen”), as a last ditch effort during board
bring-up and development if no bootable device is available. If your version of DOS, an
application, or any OEM-supplied BIOS extensions have debugging code (i.e., “INT 3”
instructions) remaining, then these will invoke the debugger automatically as an option. To
continue, use the “G” command. The debugger will respond on INT 3 instructions only if
enabled (see the Basic CMOS Configuration Setup Screen). Normally this option is set to
‘Ignored’, so that debugging code in the application will not cause the debugger to be invoked.
A complete discussion of the debugger is beyond the scope of this chapter; however, complete
documentation is available from General Software.
Console Redirection
The system can operate either with a standard PC/AT or PS/2 keyboard and VGA video monitor,
or with a special emulation of a console over an RS232 cable connected to a host computer
running a terminal program. When using the Console Redirection feature, the BIOS automatically
switches its keyboard and screen functions to serial I/O over COM1/COM2 on the board (CC6-
ACID required in addition to the CC5-RAVE). The hardware connection to the host computer
requires a null modem cable.
Console redirection can be activated by means of the Custom Configuration Setup Screen.
Individual selection of the best suited physical port for BIOS Standard I/O, Setup I/O and
Debugger I/O is provided.
The software on the target can be any terminal emulation program that supports ANSI terminal
mode, using 9600 baud, no parity, and one stop bit (Note: This can be modified by EKF during
BIOS adaptation.) The program must be set to not use flow control, or the console may seem to
stall or not accept input.
Caution if using HYPERTERMINAL from a PC
: HYPERTERMINAL’s default setting is to use flow
control, which will render the console inoperative. To change this, create a new session, change
the flow control setting to “none”, save the session, and exit HYPERTERMINAL. Then reinvoke
HYPERTERMINAL with the session and it will operate with the new flow control setting.
