Thanks to impshum digging around with epic google foo I found the correct 
GPIO_BASE for the Raspberry Pi B2. Raspberry Pi used to have a peripheral base address of 0x20000000 now it’s 0x37000000 on the B2, so the GPIO peripheral address is 0x37200000 which has broken the odd GPIO based product (including the HotPi). I’ve added a pull request to RFM12B-Linux and that should be that. I still need to merge in changes for OOK and see if that works and of course, figure out how to set the frequency to listen/transmit on.
RFM12B’s will soon become a must add hardware to the Raspberry Pi, I just need to get that software working :). It’s a great piece of kit, and the code already in github is a good jumping off point. I’ve merged in a OOK sender fork, and I’ll be adding code to put the device into OOK listen mode. All of this controlled via ioctl. Essentially with the little RFM12B’s hooked directly into the Raspberry Pi GPIO port’s SPI pins you’ll have the ability to mess with anything out there, which uses 433/434MHz or 315MHz if you’re in the US, or 915MHz or 868MHz whatever HopeRF board matches with your locations radio standards.
At present I’m looking at getting the OWL to work because I already understand most of that. Next I’ll be looking at getting RF light sockets, lightwaveRF devices, indoor/outdoor weather sensors and even doorbells into the supported devices list.
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