问题记录：ImportError: No module named _libfdt

问题描述：

Traceback (most recent call last):
  File "./tools/binman/binman", line 32, in <module>
    import control
  File "/home/xiang/linux/u-boot/tools/binman/control.py", line 16, in <module>
    import fdt
  File "/home/xiang/linux/u-boot/tools/binman/../dtoc/fdt.py", line 13, in <module>
    import libfdt
  File "scripts/dtc/pylibfdt/libfdt.py", line 17, in <module>
    _libfdt = swig_import_helper()
  File "scripts/dtc/pylibfdt/libfdt.py", line 16, in swig_import_helper
    return importlib.import_module('_libfdt')
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
ImportError: No module named _libfdt
Makefile:1148: recipe for target 'u-boot-sunxi-with-spl.bin' failed
make: *** [u-boot-sunxi-with-spl.bin] Error 1

解决方法：

//删除当前默认版本
sudo rm /usr/bin/python

//切换到 python2
sudo ln -s /usr/bin/python2 /usr/bin/python