[SeaBIOS] Open Firmware path on boot selection screen.

[Weinz Christian]

Hello,

I suggest adding the Open Firmware paths for devices SeaBIOS can boot 
from
(example: /pci@i0cf8/usb@12,2/usb-*@4) to the boot selection screen. I 
needed
to buy a serial adapter and a null modem just to get that string. That 
string
is important since you cannot modify the default boot sequence without 
it.

Best Regards,
Christian Weinz