TQ2440 开发板由核心板和底板构成，为了更加方便客户做二次开发使用，在光盘中更提供有底板的 PCB 图，更利于客户出图。-TQ2440 development board constituted by the core board and floor, in order to further facilitate the customers to do secondary development in the CD-ROM also provides a floor map of the