轉自（http://blog.chinaunix.net/uid-20789721-id-470971.html）
遇到困難：
make: Warning: File `start.S' has modification time 9.5e+05 s in the future
arm-linux-gcc -o start.o start.S -c
arm-linux-gcc -o clock.o clock.c -c
arm-linux-gcc -o led.o led.c -c
arm-linux-ld -Ttext 0 -o led.elf start.o clock.o led.o
arm-linux-objcopy -O binary led.elf led.bin
arm-linux-objdump -D led.elf > led.dis
make: warning: Clock skew detected. Your build may be incomplete.
解決：
find . -type f | xargs -n 5 touch
不明覺厲！！
Though, nothing echo , but it works! I need more time to get to know the method of the solution!
