Design of system update based on Uboot through USB interface
YU Liubing , GAO Mingyu
( School of Electronics Information, Hangzhou Dianzi University, Hangzhou 310018,China)
Abstract: In order to improve the systemupdating speed of embedded devices on the basis of low cost, both advantages and disadvantages of  serial port, network and USB interface were analyzed.A systemupdating method through USB interface based on universal boot loader(Uboot) was implemented . The implementation of USB device driver in Uboot was introduced,the movement of the interrupt vector table was analyzed, and the updating function was successfully accomplished on AT91SAM9261 processor. The experimental results show that the fast updating speed about 500 KB/s has been achieved with simple hardware configuration in practice.
Key words: universal boot loader(Uboot); interrupt vector table; systemupdating