someone was able to setup raspberry pi to stake BC ?
Yes, its easy and just behaves just as any other linux. Compiling the source takes several hours and I would also recommend to copy the blockchain data from somewhere else, but once synced the pi is staking smoothly.
If i want to buy such a micro pc, should i buy raspberry pie or banana pie? Banana has better technical specs.
I have a staking pc but it clearly takes more power than a raspie
.For staking only i think the raspberry would be the better one since it needs significantly less energy (if i am not wrong), price wise there is not much of a difference these days, about 5 EUR more for both the case and the "board" if you want the banana version...