在编译之前要进行uClinux内核的配置工作，包括RAM、ROM的大小，地址空间的分配，外围设备的支持。除此以外，最关键的工作就是实现USB主机控制器的驱动程序，这也是研究工作的重点。
2. USB 主机控制器
在介绍USB主机控制器驱动程序之前，先让我们了解一下USB系统和USB主机控制器。
2.1 USB系统和USB主控制器的基本概念
在USB系统中，各种USB设备要与主机相连，就必须通过一个共同的接口接入主机。这个接口就是USB主机控制器(USB Host Controller)。HC是软件、硬件以及固件的综合，是USB拓扑的中心。
USB总线在物理上是一种以主机为根的树状分层星型拓扑，HUB作为分枝结点，USB设备作为叶子结点。在逻辑上，USB总线是以主机为中心的星型拓扑，HUB在逻辑上也看做为一个USB逻辑设备。在逻辑上，主机直接通USB逻辑设备通信，就好像没有中间的HUB一样。USB逻辑设备是指各种各样的USB设备与主机连接所必须具有的最基本的标准接口，主机通过标准接口管理和配置所有的USB设备。
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