说明：  基于TQ2440的编译Uboot镜像的源码，支持大于64M的文件系统烧写。（在天嵌自带的光盘Uboot源码u-boot-1.1.6_20100601.tar.bz2的Common下增加此代码，并修改相应的Makefile，得到Uboot镜像就可以支持大于64M的文件系统烧写。烧写时在命令行模式下loadYaffs 0x30000000 root）
(Based on the support of more than 64M TQ2440 file system programming of Uboot. (Common in Uboot source code to increase, and modify the Makefile, you can get Uboot image file system to support more than 64M programming. Command-line mode loadYaffs 0x30000000 root))