This post is on behalf of drfranz! He is hell busy and asked me to post how to run gridseed "round units" on Raspberry PI.
This is for LTC mining only. We are currently working on the BTC mining.

Instructions:
1) Download minerd for Raspberry Pi here
2) Copy minerd into Raspberry Pi
3) Find dev name where gc3355 is attached to (es. /dev/ttyUSB0). You can run dmesg.
4) Launch the following command with the appropriate values:
minerd -G -o -u -p --freq=600 -D
Frequency parametres is currently unused

Enjoy!

P.S. In the next couple of weeks we will try to release the new version of scripta running gridseed products as well as ltcgear boards.