FULL WRITEUP TO FOLLOW!!
sudo /usr/local/bin/openocd -f interface/stlink-v2.cfg -f target/stm32f1x.cfg
FPGA code: made for this, using iCE40 UART lib: https://github.com/cyrozap/iCEstick-UART-Demo MCU code from: https://github.com/unprovable/STM32-IRQ-UART.git