on connect: validate romsize

[fenugrec]

• maybe doable with simple heuristics (IIRC accessing >512kB on 512kB ROMs wraps around).
• maybe , included in make ECUID-keylist db external #10 , associate ECUID with proper parameters (setdev, etc)

[Pytrex]

While this would probably be handled by the ECUID keylist, IIRC, there's also a SH705X ASCII string in most ROM's that could be searched for. But if the keylist will include more than just keys, you might as well just use that.