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Hi, FTDI provides a JTAG library for use with their chips. I implemented a bitstream uploader on top of that (FPGA only, no flash). Uploading the Pipistrello (LX45) logic analyzer bitstream takes about one second. It's marginally slower than fpgaprog - mainly the library startup; transfer time according to the LED seems about the same. The project is attached. Note, this is meant as example code, not as a polished tool with command line options etc. One possible advantage is that the FTDI JTAG library is open-source but not encumbered by a GPL license so it can be linked into a commercial project. The .bit filename is hardcoded; and the IDCODE response of the FPGA needs to be changed or assertions will fail (here table 5-13). jtagLoader.zip