If you just want to run openwrt on your board, you can download the image in github. This link have the image website to download and solved the eth0 linking problem. 
You can try it.
Nice, thanks for the image. But I think I’m with the same issue as @novaengineer above, how to I reach the openwrt? Neither USB or ethernet are responding, does it has a DHCP on eth or it requires one? In any case it doesn’t seems to be responding on the ethernet port. Any suggestions?
Ok, I’m using the wrong image, duos. But I have the 64mb, there is no image compiled for this version 
Sorry, the 64m image is uploaded now.You can use it now. Please help me test the bug.
You can reach the Openwrt through the UART0 (and you can easily use UART0 to reach Openwrt if you have the IO-board).It`s eth0 is static, so you must set the ip(the duo-static-ip) and gateway(your router-ip). If you use my uploaded image, you can run the network-init.sh to init your network, you must input the ip and gateway, then the bash script will auto finish your network init.
Thank you very much @piaoliuping, I have the image running on my milk-v duo64 now. I manage to use the uart to activate the network, setup the routing and was able to ssh into. Looking very nice. Now my next question, the Github mention that VizOS is an Ip camera over Openwrt, how to I get to the camera part? Does it have a web interface or generates a rtsp, does it use the milk-v camera? Thanks
对不起，我没有移植camera相关到该项目中来，因为我是学生，还在上学，并没有太多时间去搞这些。您看到的VizOS is an Ip camera over Openwrt是我从该大佬仓库fork的介绍语，我这里才刚弄好联网及luci问题，其余类似的各类硬件接口，如camera等还没开始适配，主要是我手头没有milkv camera。但是您别着急，后面如果我有时间会慢慢适配上的。当然，这需要大家的协作才能够加速适配。非常抱歉。
Sorry.
Don’t worry at all man, I will try doing something, post my results here. You have helped a lot already. I will try put luci to work as well, it does help setting you the system. Regards,
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Thanks for your help.