u-boot2009.2版本，已经移植到友善之臂SBC2410D的开发板上，修改好其中tftp命令timeout的时间太短而导致的文件下载不成功的缺陷。-u-boot2009.2 version, has been transplanted to the arm-friendly development SBC2410D board, amend the tftp command timeout which is too short of time caused by defects in th