If you have and older Mac that has a 64-bit processor but the 32-bit 1,1 or 2,1 EFI firmware (eg. a 2009 Mac Mini Core 2 Duo) and you want to install a recent 64-bit version of Linux on it, the 32-bit EFI firmware will leave you stuck at a prompt like this:
----------
1.
2.
3.
Select CD-ROM Boot Type :
-----------
with an unresponsive keyboard and no way to proceed.
