Merge branch 'master' of ssh://master.iot-yun.club:2280/raspberrypi

guowenxue

2019-08-08 d399ece9a16d2c9fe053a07912037a770f9fe1e5

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Install cross compiler to /opt path:
 
sudo tar -xjf rpi_crosstool.tar.bz2 -C /opt/