UHD USRP2 Board Syncronisation on Firmware

Hi all,

I am interested in using the new simulink block in the communications
blockset for the USRP2 receive in MATLAB. However, I wish to syncronise
multiple boards together using an external 10MHz clock reference and
signal. I assume that I can do this by making some modifications to the
firmware that loads onto the SD cards instead of implementing by sending
host commands during runtime. Does anybody have any experience of doing
this? If so, please could you tell me which parts of the firmware must
modified to allow this syncronisation and the commands required?

Any help is greatly appreciated,
Best regards,

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