https://blog.wongcw.com/2019/05/12/%e5%85%86%e6%98%93%e5%89%b5%e6%96%b0%e6%8e%a8%e9%a6%96%e9%a1%86%e5%9c%8b%e7%94%a2%e9%ab%98%e9%80%9f%e5%85%ab%e5%8f%a3spi-nor%e9%96%83%e5%ad%98%ef%bc%9a5%e5%80%8d%e6%96%bc%e7%8f%be%e6%9c%89%e7%94%a2/