Get Win32DiskImager here (assuming you are working on Windows)
get SDFormatter here
put your SD card for RaspberryPi into you SDcard reader
Format it using SDFormatter
download the latests firmware from here (select: openwrt-brcm2708-sdcard-vfat-ext4.img)
install that image onto your newly formatted SD card  using win32Diskimager

connect your pi to your router, not your computer (windows - I am hopeless with linux, and have not managed to access the control panel directly via Ethernet connected to the computer)
Boot up your pi,
wait
if you have your pi plugged into hdmi onto your TV, when it completes boot and states .. something.. something entering forwarding state.. or something (can't remember the exact line),
(if the display keeps repeating the same message over and over, then that is where it is stuck, google the message.. but be patient, raspberry Pis are slow)
point your browser to 192.168.0.100
If you see it, log in using no password, and change the Network > edit > Protocol > change to DHCP Client
Now your router will give the pi a IP address.. view your routers configuration to identify it or get IP Scanner

If, like me, your router won't allow you to address 192.168.0.100 (or any of the 192.168.0.xxx range) then you need to log into your router settings and change the IP range from whatever to something like 192.168.0.1 - 192.168.0.150 you should then be able to find it, you can then change it the openwrt settings to DHCP and remove any changes you have made to your router.
Hope that helps
after finally talking to the Avalon devs they suggest, ignore the default settings on the cgminer configuration page and use voltage to 7250, change the frequency to 500
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