研究的特点是使用自由版权的工具链，建立了实用的开发平台。
The tool chain under General Public License is used to creat a practical develop platform .
软件采用嵌入式Linux操作系统，该操作系统是公开源代码的自由软件，无版权要求，特别适合民品应用和降低成本。
The software is based on embedded Linux OS , which is free and adapted to civil product development and reducing cost .
自由版权