CC2538 Bootloader Backdoor    http://www.ti.com/lit/ug/swru333a/swru333a.pdf    http://files.cnblogs.com/files/tinyos/CC2538_ROM.pdf

 gnu-ld链接脚本浅析                  http://files.cnblogs.com/files/tinyos/gnu-ld%E9%93%BE%E6%8E%A5%E8%84%9A%E6%9C%AC%E6%B5%85%E6%9E%90.pdf