diff --git a/src/board.hpp b/src/board.hpp
index 54fa83d..98ff6c5 100644
--- a/src/board.hpp
+++ b/src/board.hpp
@@ -131,10 +131,10 @@ static std::map <std::string, target_board_t> board_list = {
 	JTAG_BOARD("colorlight-i5",   "", "cmsisdap", 0, 0, CABLE_DEFAULT),
 	JTAG_BOARD("colorlight-i9",   "", "cmsisdap", 0, 0, CABLE_DEFAULT),
 	JTAG_BOARD("colorlight-i9+",  "xc7a50tfgg484", "",        0, 0, CABLE_DEFAULT),
-	JTAG_BOARD("crosslinknx_evn",       "", "ft2232", 0, 0, CABLE_DEFAULT),
-	JTAG_BOARD("certusnx_versa_evn",    "", "ft2232", 0, 0, CABLE_DEFAULT),
-	JTAG_BOARD("certuspronx_evn",       "", "ft2232", 0, 0, CABLE_DEFAULT),
-	JTAG_BOARD("certuspronx_versa_evn", "", "ft2232", 0, 0, CABLE_DEFAULT),
+	JTAG_BOARD("crosslinknx_evn",       "", "ft2232", 0, 0, CABLE_MHZ(1)),
+	JTAG_BOARD("certusnx_versa_evn",    "", "ft2232", 0, 0, CABLE_MHZ(1)),
+	JTAG_BOARD("certuspronx_evn",       "", "ft2232", 0, 0, CABLE_MHZ(1)),
+	JTAG_BOARD("certuspronx_versa_evn", "", "ft2232", 0, 0, CABLE_MHZ(1)),
 	JTAG_BOARD("cyc1000",         "10cl025256", "ft2232",     0, 0, CABLE_DEFAULT),
 	JTAG_BOARD("c10lp-refkit",    "10cl055484", "ft2232",     0, 0, CABLE_DEFAULT),
 	JTAG_BOARD("de0",             "", "usb-blaster",0, 0, CABLE_DEFAULT),
@@ -160,7 +160,7 @@ static std::map <std::string, target_board_t> board_list = {
 	SPI_BOARD("gatemate_evb_spi",   "colognechip", "gatemate_evb_spi",
 			DBUS4, DBUS5, CBUS0, DBUS3, DBUS0, DBUS1, DBUS2, 0, 0, CABLE_DEFAULT),
 	JTAG_BOARD("genesys2",        "xc7k325tffg900", "digilent_b", 0, 0, CABLE_DEFAULT),
-	JTAG_BOARD("gr740-mini",      "", "ft4232hp_b",       0, 0, CABLE_DEFAULT),
+	JTAG_BOARD("gr740-mini",      "", "ft4232hp_b",       0, 0, CABLE_MHZ(1)),
 	JTAG_BOARD("hseda-xc6slx16",  "xc6slx16ftg256", "",           0, 0, CABLE_DEFAULT),
 	/* most ice40 boards uses the same pinout */
 	SPI_BOARD("ice40_generic",    "lattice", "ft2232",