Text File tranfer between PC and Atlys board (FPGA)
I would choose the Serial method as the easiest one to implement. I am talking about Asynchronous Serial protocol, which is logically compatible with computer's serial port (COM1, COM2, etc). Electrically it should be converted to the levels computer uses. The standard is called RS-232. You should look up for UART(Universal Asynchronous Receiver/Transmitter) implementation for your FPGA, or implement one by yourself (which is not that easy, but easiest among the options you have).