求助：使用Dnw工具进行出厂程序烧写

今天刚收到板，按裸奔三部曲第0章操作时，在第三步结束时出现如下程序，按说明输入a时，还未按回车键就出现下述情况。重做了两次也是这个结果，求解答。
##### EmbedSky BIOS for SKY2440/TQ2440 #####
Press Space key to Download Mode !

#####    Boot for Nor Flash Main Menu   #####
[1] Download u-boot or STEPLDR.nb1 or other bootloader to Nand Flash
[2] Download Eboot to Nand Flash
[3] Download Linux Kernel to Nand Flash
[5] Download CRAMFS image to Nand Flash
[6] Download YAFFS image to Nand Flash
[7] Download Program (uCOS-II or TQ2440_Test) to SDRAM and Run it
[8] Boot the system
[9] Format the Nand Flash
[0] Set the boot parameters
[a] Download User Program (eg: uCOS-II or TQ2440_Test)
[b] Download LOGO Picture (.bin) to Nand  Flash
[l] Set LCD Parameters
[o] Download u-boot to Nor Flash
[r] Reboot u-boot
[t] Test Linux Image (zImage)
[q] quit from menu
Enter your selection: a
USB host is not connected yet.

应该是USB驱动没装好

你USB下载线没接上，或者是你USB下载线驱动没装。。。你看你最后一行就知道了。。。

2# wellf
谢谢了，确实是驱动没装

3# kira545699636

高手啊，呵呵 谢谢了

驱动在哪个地方啊？怎么我没有找到呢？

光盘里有USB下载驱动，就这个。