U-Boot 2009.11在S3C2440上的移植

Transplantation of U-Boot on the S3C2440

对Bootloader技术以及目前流行的U-Boot 2009.11进行了介绍与分析,并针对U-Boot的2个启动阶段,从代码角度讨论了其启动过程及原理.U-Boot第1阶段处理与硬件较为紧密的部分,用汇编语言编写,第2阶段的代码由C语言编写,完成较为上层的初始化部分.还介绍了将U-Boot 2009.11移植到基于S3C2440的开发板上的过程与方法,通过加入开发板支持,中断处理、控制寄存器及分频系数设置等,最终成功实现了U-Boot在S3C2440上的运行.

In this paper, technology of Bootloader and popular U - Boot 2009.11 are introduced and ana- lyzed, aiming at two start - up phases of U - Boot. The principle and process of its start - up are discussed with the code perspective. The first phase of U - Boot treats the part which is more closely with the hardware written in assembly language The second phase of the code is written in the C language to deal with the initialization of the upper part. The process and methods of how to transplant the U - Boot 2009.11 to the development board based on S3C2440 are described in the paper. By joining the development board support, interrupt handling, controlling register and frequency coefficient set, we successfully achieve the work of the U - Boot on the S3C2440 in the end.