I found the following line in uhd_usrp_probe that looks like it does what I’m 
looking for:

`if (tree->exists(path / "fw_version")) {`

` ss << "FW Version: " << tree->access<std::string>(path / "fw_version").get()`

` << std::endl;`

` }`

The next question is where does the firmware version get set? I did some poking 
around fpga/usrp3/top, but it’s not immediately obvious. Is this set somewhere 
in the build scripts? I run the standard Makefile when I build my custom image. 
I would like to write something so I can definitely distinguish this FPGA is 
running my modified firmware.
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