> 
> thanks for this, but if i mus enter the extra parameter, i need keyboard
> and monitor attached into this machine, can i add this parameter into
> grub?

Not necessary. the device should either provide access to configuration menu
with kind of vga cable you plugin to reconfigure the bios, or if there is
no vga console it would be configured to output everything to the console

> 
> if i can what program i can use to edit the debian dvd iso so i can edit
> the boot configuration
> 
> many2 thanks

I would do following. 
1) find out which speed the device supports on the serial console by reading
the documentation and/or specification. 
2) Take a computer with serial port and configure it to match the spec of
the device (useally setserial on linux)
3) connect the pc with the device with a serial cable
4) run a program to talk to the serial port (usually minicom on linux)
5) configure the program (minicom) to talk to the local serial port which is
connected to the device
6) fire up the device (I mean turn it on) - and there it is in the serial
chat program (minicom) I see how the device displays the debian logo in
monochrom colors

regards





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