基础ubuntu系统配置
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运行以下命令：

.. code-block:: bash

   sudo apt-get update
   sudo apt-get install iputils-ping vim git wget xz-utils bzip2 gcc device-tree-compiler python time make
   wget https://releases.linaro.org/components/toolchain/binaries/latest/arm-linux-gnueabihf/gcc-linaro-7.1.1-2017.08-x86_64_arm-linux-gnueabihf.tar.xz