> Sometimes when I boot my NetBSD it stops on this message:
> 
>     "Setting ttys"

Do you mean "setting tty flags"?

that's printed right before it executes the 
	ttyflags -a
command.

Perhaps you have an entry in /etc/ttys for an "unhappy" serial line or
device?

ttyflags -a -v should show more information about what it's trying to
do..

					- Bill