I'm sorry, I thought there were classic Amiga, and indeed retrocomputing fans on this site. People who remember the 90's. Cramming everything needed to boot AROS on to 1MB of ROM space is impossible? Gee, can no one here write in assembler? Has everyone forgotten that back in then we did this kinda $#!% all the time?
The only things that need to be on the ROM are the AROS equivillant versions of what's on the Kickstart ROMs... Essentially the drivers necessary for the system to recognize its vital hardware and continue booting from the main boot device.
In the case of the bounty, only what is necessary for UAE to boot up... No matter what chipset it's for. Start small, think big. Yes, ultimately it should be the equivillant to a complete A1200 or A4000 ROM set... But this is just the first step.
Oh, and anyone who thinks writing the core OS features necessary to boot AROS within 1MB of space has completely forgotten about the QNX demo floppy. Impossible?? I think not. Cut out the GUI and I'm sure it'd be less than 512K.