【摘要】 PowerPC P2020是Freescale公司一款性能优良的处理器,在电信、军事、网络等领域都有着广泛的应用。SPIFLASH作为一种重要的启动方式,是用户在进行硬件设计时经常采用的方法之一。它不仅可以丰富用户对于启动方式的选择,同时也可以作为备份启动模式,提高系统的稳定性。鉴于SPI FLASH启动方式的重要性,文中以P2020为硬件平台,对SPI FLASH启动方式的实现进行了研究。首先,描述了P2020处理器上电之后SPI FLASH两个阶段的启动过程;其次,介绍了SPI FLASH启动镜像的制作过程;再次,针对实际操作SPI FLASH中遇到的一些问题,文中进行了有效地解决;最后,在完成uboot及linux的移植后,最终成功实现了SPI FLASH启动方式。系统上电之后,可成功启动uboot并加载linux,且可以稳定运行。更多还原

【Abstract】 PowerPC P2020 is a high-performance processor of Freescale Semiconductor,which has a wide range of applications in areas such as telecommunications,military,network.As an important boot media,SPI FLASH is one of the most used methods when users design their hardware.It can enrich the user’s choice for the boot mode.At the same time,as a backup boot mode,it can also improve the stability of the system.In view of the importance of SPI FLASH boot mode,based on the P2020 platform,conduct a research on the implementation of booting from SPI FLASH.Firstly,describe the two boot stages of SPI FLASH after P2020 power on.Secondly,introduce the process of building the SPI FLASH image used for booting.Thirdly,for some of the problems encountered in the actual operation on SPI FLASH,give effective solutions.Finally,after the transplantation of uboot and linux,implement the booting from SPI FLASH.After power on,the system can boot the uboot and load linux successfully,and run within a stable condition.更多还原