自己修改的VxWorks6.6下spiflash驱动程序，对于想了解VxWorks下块设备工作方式的朋友很有帮助。代码流程清晰，结构简单且有大量注释。-VxWorks6.6 under spiflash drivers, who want to know the block device works under VxWorks helpful friends. Code process clear, simple structure and there is a lot of comments.