The point in having ehci-hcd loaded before the other is that if either uhci or ohci get loaded before and a usb2.0 is present then it will behave as a usb1 device and be blocked by these drivers.
The point in having ehci-hcd loaded before the other is that if either uhci or ohci get loaded before and a usb2.0 is present then it will behave as a usb1 device and be blocked by these drivers.