arm-elf-gcc -g -c crt0.s
arm-elf-gcc -g -c define.s	
arm-elf-gcc -g -c main.c
arm-elf-nm main.o
arm-elf-ld -g  -T ld_flash -o flash.elf crt0.o main.o define.o
rem arm-elf-nm elf32 arm flash.elf
arm-elf-objcopy -O srec flash.elf flash.hex
arm-elf-objcopy -O  binary  flash.elf flash.bin
