https://qooah.com/2014/12/03/%e8%8f%af%e7%82%ba%e7%99%bc%e4%bd%88%e7%ac%ac%e4%b8%80%e6%ac%be-64-bit-%e8%99%95%e7%90%86%e5%99%a8-hisilicon-kirin-620/