设计与实现了一个基于 PXA255 的 bootloader。PXA255 是 Intel Xscale 系列处理

器之一，Xscale 核心是与 ARM V5TE 构架兼容的，是一个典型的 ARM 系统。软件采用 Linux

为操作系统。课题除了实现 bootloader 的基本功能（加载内核镜像）外，还将它实现成一个

更加复杂的系统，包括 bootloader 的两种模式的支持和切换，以及增加对一些硬件模块的

支持，这些模块包括：串口、USB、NOR FLASH 的擦写等等，以方便开发人员进行调试以及

开发，例如：通过串口以及 USB 接口传输数据以更新内核镜像；擦写 FLASH 以更新 FLASH

内容。-Design and Implementation of a PXA255 based on the bootloader. Intel Xscale PXA255 series processors is one, Xscale core is compatible with the ARM V5TE framework, is a typical ARM systems. Using Linux as the operating system software. Bootloader issues in addition to achieving the basic function (loading the kernel image), the will to achieve it into a more complex system, including the bootloader of the two modes of support and switching, and increased support for some hardware modules, these modules include: serial, USB, NOR FLASH the erase, etc., to facilitate the developer for debugging and development, for example: serial and USB interface to transfer data to update the kernel image　erase FLASH FLASH to update the content.