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Before UHD version 3.9.0 on-board GPSDO modules for USRP devices were automatically enabled if detected. After UHD version 3.9.0 the UHD behavior changed to require explicit setting of the reference to enable GPSDO use. Modify the interfaces to pass 'internal', 'external' and 'gpsdo' reference options from configuration database into the UHD driver layer. Convert the 'TRX.reference' entry in the configuration from a boolean value to string.