$ /usr/local/arm-tools/bin/arm-elf-as startup.s -o startup.o
$ /usr/local/arm-tools/bin/arm-elf-gcc -c gdb-stub.c
$ /usr/local/arm-tools/bin/arm-elf-ld startup.o gdb-stub.o -T memory.def -o monitor -Map monitor.map
$ /usr/local/arm-tools/bin/arm-elf-objcopy -O ihex monitor monitor.hex
