Linux系统下主机和开发板传输文件的工具，成功编译并加载secbulk驱动模块后，运行dnw工具，文件即可通过USB接口从主机下载到开发板-Linux system development board under the host and the tools to transfer files successfully compile and load secbulk drive module, run dnw tools, files can be downloaded through the USB interface from the host to the development board