https://single9.net/2015/05/%e5%a6%82%e4%bd%95%e8%a8%ad%e5%ae%9a-beaglebone-black-%e9%80%8f%e9%81%8e-usb-%e7%9a%84%e7%b6%b2%e8%b7%af%e9%80%a3%e7%b7%9a/