Sounds like a typical linux bios experience to me. Calling this machine an Amiga without the AmigaOS is not really fair. What you have is a PowerPC machine with a generic Bios, it's not an Amiga till it boots Amiga..
This machine should have never been released without AmigaOS 4..
-Don
PS I know I will hear gripes from the last statement but come on folks it's not really an Amiga until the OS is in it, it doesn't have Amiga custom hardware in it. It is simply a linux box with an OS that isn't at all like the Amiga..