Let me describe the solution to my problem about "No accepted shares" in case it might benefit somebody whose search brings them to this thread.
I have two separate farms of gridseeds, but when I wanted to learn to use Raspberry Pi, I went to a third location. I wanted just a standalone rig where Pi and I could get acquainted. No hub, just USB straight from Pi to GS. For power supply, I used a single-unit, "12v 1A" supply that came with one of my Gridseeds. And that power supply is what turned out to be the problem.
As soon as the theory hit me that the power supply didnt have enough ass, I wanted to check the voltage under the load of the GS. It has a molded plug, so no screwing off the plastic cover to get at the terminals. If it had regular twin lead running to it, I could have stuck a needle in each wire and measured the voltage that way, but no, it's coaxial cable. So I hooked up another power supply, and bam bam bam one acceptance after another.
It's a blessing, really, I learned lots more about the Pi than I would have...
It seems the gridseed-support feature is gone from nwoolls repository. So I substituted:
git clone git://github.com/luke-jr/bfgminer.git
I really appreciate your step-by-step, which inspires me to present YOU with my question:
I have tried the GAWminers img, and the Zoomhash img, and I have built several Raspbian Wheezy systems, including yours . I have tried installing a python stratum proxy. I have used cgminer and bfgminer. I get the same results no matter what I do:
I connect to a pool, I get no Accepts. (I have tried various pools, including this one, but I mainly use a different pool so I can watch my dashboard on it to see hashrate...)
I restart the miner, sometimes I get one (1) Accept, then no more.
One time, using cgminer, I got quite a few Accepts in a row. In fact, I got 32 Accepts each time my work was accepted. When the number of Accepts got to 1072, it stopped. (I realize 1072 is not a multiple of 32, I'm just telling the truth...)
I am not looking for anybody to help me debug and such, I am just hoping that my situation rings a bell with you.
git clone -b feature/gridseed-support https://github.com/nwoolls/bfgminer