Here I do program FPGA with a serial port RAM filler (homemade), and then I do upload ROMs (sooo long, you can show several blue progress bars), and then I do program FPGA first schematic : Z80+RAM+ROM, executing it, and then I do program second schematic : VGA is plugged on FPGA platform and does display "Ready".
Just about the "RAM filler", filling a RAM with data is perhaps the more important thing about using FPGA platforms, do just remember that a RAM does keep its content as long as voltage is entered on it. So you can program FPGA without erasing RAM content. So you can program three FPGA programs : one for filling RAM, one for running a program using RAM, one for dumping RAM. Here I did use a serial transmit, but in fact, in last versions of FPGAmstrad, I does do use a SDCARD with a homemade bootloader (filling RAM from SDCARD content)
=== Bootloader ===