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HOST_SYNC is only connected to connector P28, and is therefore not driven (left to float) unless connected to some synchronization signal. Pull it up to keep it steady. In doing so, I had to switch all unused pins to pull-up, and all input-only and tri-state pins to float. All input/tri-state pins except for HOST_SYNC are tied to the microcontroller and can be pulled up there.
The primary firmware source code for USB HackRF devices is hackrf_usb. Most of the other directories contain firmware source code for test and development. The common directory contains source code shared by multiple HackRF firmware projects. The cpld directory contains HDL source for the CPLD. The firmware is set up for compilation with the GCC toolchain available here: https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads Required dependency: https://github.com/mossmann/libopencm3 If you are using git, the preferred way to install libopencm3 is to use the submodule: $ cd .. $ git submodule init $ git submodule update $ cd firmware/libopencm3 $ make To build and install a standard firmware image for HackRF One: $ cd hackrf_usb $ mkdir build $ cd build $ cmake .. $ make $ hackrf_spiflash -w hackrf_usb.bin If you have a Jawbreaker, add -DBOARD=JAWBREAKER to the cmake command. If you have a rad1o, use -DBOARD=RAD1O instead. It is possible to use a USB Device Firmware Upgrade (DFU) method to load firmware into RAM. This is normally only required to recover a device that has had faulty firmware loaded, but it can also be useful for firmware developers. For loading firmware into RAM with DFU you will need: http://dfu-util.sourceforge.net/ To start up HackRF One in DFU mode, hold down the DFU button while powering it on or while pressing and releasing the RESET button. Release the DFU button after the 3V3 LED illuminates. A .dfu file is built by default when building firmware. Alternatively you can use a known good .dfu file from a release package. Load the firmware into RAM with: $ dfu-util --device 1fc9:000c --alt 0 --download hackrf_usb.dfu It is important to update the CPLD whenever you are updating firmware and a new CPLD image is available. See cpld/README for instructions.