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Unused USB ports on custom board

Hi, all!

On my custom board USB0 work fine. I connected all pins related to USB0: USB0_DP, USB0_DN, USB0_R1, USB0_DRVVBUS, VDD_USB0_VBUS. All pins related to USB1 stay unconnected. While Linux booting I see this messages in minicom screen:

hub 2-0:1.0: over-current change on port 1
hub 2-0:1.0: over-current change on port 1
hub 2-0:1.0: over-current change on port 1
hub 2-0:1.0: over-current change on port 1
hub 2-0:1.0: over-current change on port 1

1) What does it mean?

2) How I can disable USB1?

Thank you.