http://jingyan.baidu.com/article/91f5db1bf715c01c7f05e39a.html
http://cn.tek.com/learning/oscilloscope-tutorial?utm_source=Baidu-Success_Events&utm_medium=cpc&utm_campaign=Success_Events_Success_Events_CN(S)_success_cn_scope_guide&covid=covtekbdu81000000009393s&utm_term=CDRSbdu961s
http://zhidao.baidu.com/link?url=CRYtFiBdcjsiH6fqDHlHkdNAMLJg43NT6HHsUodUsDySGy5aZkIzZ3vHwi7zIfiyPpXVkvgdLF9rnfPqW84mZq
1.后面发现是网络变压器不稳定造成link up or down !!!,其他几款板子貌似phy 没焊好
2.sd卡启动不来读不到内存ddr 后面发现是blk 128片的旁边的电阻焊错了