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

guowenxue

2019-08-03 e6e79ca02d323e9a10f115ade7ba6ac9c0d7a3f0

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