Partly answering myself, I found this https://forum.quicklogic.com/viewtopic.php?f=4&t=29 After reading that I'm still not sure if using the tinyfpga programmer will overwrite the factory bootloader or store the m4/fpga image in another part of the flash. My experience from tinyfpga BX tells me ...

Hi there,

I was wondering if it's possible to load the FPGA image over serial using the factory flash image to save me from getting an swd cable