jlink 下载u-boot 到nand flash 不需要验证flash的ID号，可用于K9F K9S 系列的-jlink used to download u-boot to nand flash without check flash ID if appended! used for k9f and k9s

该实验程序完成了land flash的读写测试，包括串口打印输出功能，适用于fl2440，ok2440上的k9f**（2K） nand falsh读写实验代码-The experimental procedure is completed the land flash read and write tests, including serial print output for fl2440, ok2440 on k9f** (2K) nand falsh experimental code r