基于S3C2440的U-Boot双启动实现

Implementation of Double Boot in U-Boot Based on S3C2440

中文关键词:  S3C2440  U-Boot  双启动  Linux内核

英文关键词:S3C2440  U-Boot  double boot  Linux kernel

中文摘要:

      嵌入式处理器S3C2440同时支持Bootloader从Nor Flash和Nand Flash启动，而U-Boot默认的启动设备为Nor Flash。为了使U Boot同时支持从Nor Flash和Nand Flash启动，根据U-Boot在S3C2440处理器上的启动流程和 U-Boot从Nand Flash和Nor Flash启动过程的差异，添加了Nand Flash读写驱动，使其同时支持Nor Flash和Nand Flash启动，并在此基础上分析并实现了U-Boot引导Linux内核镜像的过程。实现的源代码在交叉编译环境中编译通过，可以同时支持Nor Flash和Nand Flash的启动并能正确引导Linux内核，在基于S3C2440处理器的硬件平台上稳定运行。

英文摘要:

      Embedded processor S3C2440 supports bootloader boot from both Nand Flash and Nor Flash,but U-Boot's default booting device is Nor Flash.In order to support the boot from Nor Flash and Nand Flash in the U-Boot,according to the boot process of U-Boot in the S3C2440 processor and the difference that U-Boot boots from Nor Flash and Nand Flash，the Nand Flash drive that it can support both Nor Flash and Nand Flash boot is added.Based on this,the process of U-Boot booting the Linux kernel is analyzed and finally implemented.The U-Boot source code is correctly compiled in the cross-compiler.It can support both Nor Flash and Nand Flash boot,properly boot the Linux kernel and run stably in the hardware platform based on S3C2440 processor.