ethernet over usb on u-boot

I want to use ethernet over usb in order to use nfs&tftp. I couldnt see any interfaces related to ethernet over usb on host pc also.
→ I downloaded latest u-boot resource and compile it by using am335x_evm_defconfig. I entered the u-boot cmd and setting ip addresses. But not worked.
→ I also edited config file by adding belows:
CONFIG_USB_HOST_ETHER=y
CONFIG_USB_ETHER_ASIX=y
CONFIG_USB_ETHER_ASIX88179=y
CONFIG_USB_ETHER_LAN75XX=y
CONFIG_USB_ETHER_LAN78XX=y
CONFIG_USB_ETHER_MCS7830=y
CONFIG_USB_ETHER_RTL8152=y
CONFIG_USB_ETHER_SMSC95XX=y
CONFIG_USB_GADGET_DOWNLOAD=y

Again not worked.