说明： u-boot，一个通用的嵌入式bootloader，支持多种处理器，x86/arm/powerpc/mips，这个是最新版本v1.3.3的源码。下载后将扩展名gz改成bz2。 (u-boot, a generic embedded bootloader, to support multiple processors, x86/arm/powerpc/mips, this is the latest version of the source code v1.3.3. Gz extension after downloading into bz2.)
