https://github.com/siklon/usb-miner/tree/master/software/cpuminerShort summary:
* Added hashrate statistics
* Added auto per-chip frequency tuning
* Added JSON API at port 4028 -> send {"get":"stats"} to get stats for each miner/chip
* Input any frequency you want
-G, --gc3355=DEV0,DEV1,...,DEVn enable GC3355 chip mining mode (default: no)
-F, --freq=FREQUENCY set GC3355 core frequency in NONE dual mode (default: 600)
-f, --gc3355-freq=DEV0:F0,DEV1:F1,...,DEVn:Fn individual frequency setting
-A, --gc3355-autotune auto overclocking each GC3355 chip (default: no)
It should work on Rpi, but I haven't tested it yet.
Firmware update will follow shortly, I have managed to pack php5 into the new firmware image, which means that the web interface will be MUCH faster and more responsive.
I have added mining stats for each individual GC3355 chip as well, there will be a button next to each device to expand the stats so it doesn't clutter the whole interface.