Just a quick update.  I don't think it will be possible to run avalon nano 3's from the Raspberry PI 2.  The usb hubs just don't seem to have enough power.  I had an old dell 4600 that we were not using and I put Fedora Core on it and installed bfgminer.  I was finally able to run 4 avalon nano 3's on an Amazon Basic 7 port usb hub I purchased a few weeks ago.  I could not run them on the ETEKCITY 10 port hub that I had.  In any event it needs a PC with a real power supply to run these.

I was able to run the 4 Safire Erupters on the Raspberry Pi 2 with the ETEKCITY 10 port hub but I am going to replace it.  The quality seems really poor.  I have one final issue on Fedora core to get nailed down.  I have to use sudo to run bfgminer right now.  I think it has something to do with permissions for the /dev/ttyACMx devices.  I think I saw something on that earlier when I was playing with cgminer.

I won't really make any real money but it has been a fun experience.

I have been working on getting the Raspberry Pi 2 to do this for a couple of weeks.  I think the powered usb hub is the key.  I got an Amazon Basics 7 port hub and ran the Erupter Safires with no problem.  However, when I put in a couple of Avalon Nano 3's it only runs a few hours then the system hangs.  I have gotten the it to work with 2 Avalon Nano's for extended periods but I can only get constant work when the Avalon Nano's are on my Windows box.  Of course it runs a very reasonable power supply so in addition to the powered hub that has to help.

I have actually gotten the Safires and Nano's to run together for a time using icarus but never for any length of time.

Right now have on worker on my Windows box and it's config is as follows:

bfgminer -S ICA:all ^
-o stratum+tcp://stratum.bitcoin.cz:3333 -u User.Worker -p Password ^
--set-device ICA:baud=115200 ^
--set-device ICA:reopen=timeout ^
--set-device ICA:work_division=1 ^
--set-device ICA:fpga_count=1 ^
--set-device ICA:probe_timeout=100 ^
--set-device ICA:timing=0.22 ^
--api-listen 2>log

I can use this as well:

bfgminer -S ICA:\\.\COM4 -S ICA:\\.\COM5 -S ICA:\\.\COM6 -S ICA:\\.\COM7 ^
-o stratum+tcp://stratum.bitcoin.cz:3333 -u User.Worker -p Password ^
--set-device ICA:baud=115200 ^
--set-device ICA:reopen=timeout ^
--set-device ICA:work_division=1 ^
--set-device ICA:fpga_count=1 ^
--set-device ICA:probe_timeout=100 ^
--set-device ICA:timing=0.22 ^
--api-listen 2>log

The other worker is on my Raspberry PI 2 and it's config is as follows:

./bfgminer -S erupter:all -o stratum+tcp://stratum.bitcoin.cz:3333 -u User.Worker -p Password

it also works using -S All.  I usually run it manually like this then save the config.  Then i restart it with the following:

screen -S Mining ./bfgminer

I am going to try picking up a powered USB 3.0 hub to see if that will help.  I would really love to get all 8 miners running on the Raspberry.

Thanks to everyone for posting - your posts have been very helpful

I was able to get the Avalon Nano 3 to work on my Windows 7 system with bfgminer.  The driver was the key and of course getting the correct commands to configure it.  It did quite well but I really wanted to do this on my Raspberry PI 2 since I did not really want to tie up my Windows box with these.

I had initially purchased some ASICMiner Block Erupter USB 330MH Saphire Miners.  I was able to get those running fine with bfgminer.

screen –S Mining ./bfgminer –o stratum+tcp://stratum.bitcoin.cz:3333 -S All –u UserName -p Password

But when I added the Avalon Nano 3's I can't seem get a config that works with both.  It runs for awhile but finally dies after a few hours.  The following was the config I tried that worked for awhile.  It shows the Safire Miners as BES and the Avalon Nano 3's as ICA.

screeen -S Mining ./bfgminer -o stratum+tcp://stratum.bitcoin.cz:3333 -S /dev/ttyUSB0,/dev/ttyUSB1,/dev/ttyUSB2,/dev/ttyUSB3,/dev/ttyACM0,/dev/ttyACM1 -u UserName -p Password --set-device ICA:baud111520 --set-device ICA:timing=0.22 --set-device ICA:reopen=timeout --set-device ICA:work_division=1 --set-device ICA:probe_timeout=100 --set-device ICA:fpga_count=1

The Raspberry PI 2 runs one or the other.  I am guessing that it might be power related but I am not sure.  I have a new USB hub arriving and will try that.