from usb_blaster.c:138
static struct drvs_map lowlevel_drivers_map[] = {
#if BUILD_USB_BLASTER
{ .name = "ftdi", .drv_register = ublast_register_ftdi },
#endif
#if BUILD_USB_BLASTER_2
{ .name = "ublast2", .drv_register = ublast2_register_libusb },
#endif
{ NULL, NULL },
};