board, efinix: added SPI variant for efinix t20 BGA256 board

Author: trabucayre

src/board.hpp

@@ -224,6 +224,8 @@ static std::map <std::string, target_board_t> board_list = {
 	SPI_BOARD("titanium_ti60_f225","efinix", "efinix_spi_ft4232",
 			DBUS4, DBUS5, DBUS7, DBUS3, DBUS0, DBUS1, DBUS2, DBUS6, 0, CABLE_DEFAULT),
 	JTAG_BOARD("titanium_ti60_f225_jtag", "ti60f225","efinix_jtag_ft4232",  0, 0, CABLE_DEFAULT),
+	SPI_BOARD("trion_t20_bga256",  "efinix", "efinix_spi_ft2232",
+			DBUS4, DBUS5, 0, DBUS3, DBUS0, DBUS1, DBUS2, DBUS6, 0, CABLE_DEFAULT),
 	JTAG_BOARD("trion_t20_bga256_jtag",   "t20f256", "efinix_jtag_ft2232",  0, 0, CABLE_DEFAULT),
 	SPI_BOARD("trion_t120_bga576","efinix", "efinix_spi_ft2232",
 			DBUS4, DBUS5, DBUS7, DBUS3, DBUS0, DBUS1, DBUS2, DBUS6, 0, CABLE_DEFAULT),

src/efinix.cpp

@@ -83,6 +83,8 @@ Efinix::Efinix(Jtag* jtag, const std::string &filename,
 	std::string spi_board_name = "";
 	if (board_name == "xyloni_jtag") {
 		spi_board_name = "xyloni_spi";
+	} else if (board_name == "trion_t20_bga256_jtag") {
+		spi_board_name = "trion_t20_bga256";
 	} else if (board_name == "trion_t120_bga576_jtag") {
 		spi_board_name = "trion_t120_bga576";
 	} else if (board_name == "titanium_ti60_f225_jtag") {