说明：  基于DM642的大容量FLASH引导加载方法研究，dm642的家在分为一级加载，二级加载，与其他的dsp芯片略有不同，研究大容量程序加载，为以后写复杂程序成功加载dsp奠定基础
(Study on loading method of large capacity FLASH DM642 based on DM642 guide, in divided into the primary loading, two level loading, slightly different from the other DSP chips, research on large capacity program loading, laying the foundation for future success writing complex programs loading DSP)