usb host的驱动程序，在嵌入式环境可用。主流厂家的ohci，uhci等，验证没问题。-usb host driver, available in the embedded environment. Mainstream manufacturers ohci, uhci, verify that no problem.

承上启下继往开来，承的是U 盘/HUB，启的是UHCI/EHCI，抓住设备和驱动两条生命线， 讲述usb core 的故事。-Future nexus, the Order of the U disk/HUB Kai UHCI/EHCI, seize equipment and driving two lifelines, tells the story of usb core.