White Rabbit (WR) is a digital synchronization protocol over Gb Ethernet whose development is centralized by CERN with contributions from high energy physics communities including accelerators and detectors. The sub-ns synchronization capability provided by WR makes it well suited for distributed-SDR system synchronization, but the phase detection mechanism requires two tunable oscillators hardly found in generic FPGA boards. Thanks to the advances of FPGA internal clocking circuitry, WR has been demonstrated to run on generic boards not fitted with these peripherals: we demonstrate WR synchronization of the (low cost) AcornCLE215 board and Enjoy Digital's M2SDR board with some limitations over the dedicated hardware and induced by the AD936x RF frontent.