I just received an nRF51822 eval/development board that has a sticker on it that says "PCA10004". I also just downloaded the latest SDK (nrf51_sdk_V6_1_0).
As far as I can tell, the SDK only supports boards nrf6310, PCA10000 and PCA10001. I also see a header file for PCA10003 (with no samples). I don't see anything referring to PCA10004. Is this board unsupported by the SDK or is PCA10001 close enough?