modified:   Makefile
	modified:   driver/exeption.c
	modified:   driver/exeptionTrampolin.S
	modified:   driver/ivtInit.c
	modified:   driver/ivtJump.S
	deleted:    driver/ttyS.c
	deleted:    include/ttyS.h
	modified:   lib/printf.c
	modified:   lib/scanf.c
	modified:   system/start.c
	new file:   driver/debugUnit.c
	new file:   include/debugUnit.h