[U-Boot] RPi3 + arm64/ARMv8 USB Keyboard not detected

I have u-boot 2017.03 and 2017.05 detecting the keyboard in 32 bit mode. But in 64 bit mode the keyboard is never detected. Under the 32 bit mode, 4 items are detected using "usb tree". In 64 bit mode only 3 items are detected. I have tried "usb start" and "usb reset".

Any suggestions would be appreciated.

Thanks.