Features of the EHCI driver include:
Complies with enhanced host controller interface that supports USB 2.0.
Supports high-speed control, bulk, interrupt, and isochronous transfers.
The USB 2.0 chip has one EHCI controller and one or more OHCI or UHCI controllers.
A USB 1.1 device is dynamically assigned to the OHCI or UHCI controller when it is plugged in. A USB 2.0 device is dynamically assigned to the EHCI controller when it is plugged in.
Use the prtconf command output to identify whether your system supports USB 1.1 or USB 2.0 devices. For example:
# prtconf -D | egrep "ehci|ohci|uhci" |
If your prtconf output identifies an EHCI controller, your system supports USB 2.0 devices.
If your prtconf output identifies an OHCI or UHCI controller, your system supports USB 1.1 devices.