Why? (a) only those which will use putcs, and (b) I see no 512 chars limit
anywhere in new code. And in old code it is there only because of passed
data are only 16bit, not 32bit wide... With simple search&replace you can
extend it to any size you want, as long as you'll not use sparse font
bitmap.
The current "core" console code screen_buf layout is designed after VGA
text mode. 16 bits which only 8 bits are used to represent a character, 9
if you have high_fonts flag set. The other 8,7 bits are for attributes.
This is very limiting and it does effect fbcon.c :-( I like to the console
system remove these awful limitation in the future. This why I like to see
fbdev drivers avoid touching strings from the console layer.