[URGENT] FW Debugging method used during LimeSDR dev

Hi,

Can anyone please shed some light on how debugging was done during LimeSDR FW development? Was it JTAG, UART or something else?

Just want to know whether I am going in the right direction using OpenOCD and Olimex JTAG or not? Are there any configuration files or procedure that you can share please?

Thanks
Gaurav