I added the Wiring board to the boards.txt, but the IDE cannot see it - likely due to some missing core data in the cores folder, however, no procedure to follow to complete.
I found a site that gave the fuse data - its a fuse calculator;
www.frank-zeal/fusecalc/fusecalc.php?chip=atmega644pa
However the unlock bit data is missing.
And of course, it is uncertain if this fuse calculator is correct.
There is more to this procedure, but cannot find a way to complete - maybe Arduino can tell everyone how they add a microcontroller, then everyone will benefit.