RFNOC gain example warning

[Maxime . Dupont]

Hi,

I followed step by step the oot gain tutorial for RFNOC and was able to 
generate the image with the 0/Block#0. I loaded it onto the X310 and 
uhd_usrp_probe returned the expected result displaying the newly added 
block but with a warning stating the block with noc id 0xb16, 0xffff was 
not found. Is this normal?

And also, if a cpp application would make use of that particular block, 
would it even be able to instantiate it? I am having trouble right now 
because my program cannot find the 0/Block#0. Am I missing anything?

Maxime