Sorry, I'm not sure what to do about that one.  My only problem was that I needed to log in and change the IP address, using the 'ifconfig' command.  It's saying it can't mount the root partition, which basically means it can't even see the operating system files in order for it to boot.

I'm not really familiar with OpenWRT, but the miner's software seems to be largely based on it, if you can't find help here, you might try a forum for that.