本文介绍了U-Boot编译前的准备工作，包括清理中间文件、配置目标板版本及编译过程。首先需要使用make clean或make distclean命令清理之前产生的中间文件；然后通过make board_version_config选择适合的目标板配置；最后运行make命令指定交叉编译器路径完成编译。
1, Before config and compile the U_boot, you shoule delete the mid-files generated by before compile.
the command is "make clean" or "make distclean", it is up to the Makefile.
2, Run command "make board_version_config", the board_version_config can be found in the Makefile. when you choice another board, the "board_version_config" also should be change to adapt to the board.
3, Run command "make" or "make CROSS_COMPILE= /path/arm-linux-" to compile the U_boot.
It may cost several mintunes, you can find a file named "u_boot.bin" in the first layer directory.
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