When I do a prtconf -D on my system, why do I see 3controllers (ehci, 2 x ohci) associated with my USB 2.0 PCI card?
pci, instance #0 (driver name: pci_pci) pci, instance #1 (driver name: pci_pci) usb, instance #1 (driver name: ohci) usb, instance #2 (driver name: ohci) usb, instance #0 (driver name: ehci) That means there is an ehci host controller on the cardand it has two companion ohci controllers.The ehci is the usb2.0 controller; ohci is the usb1.x controller.If a USB 1.x device is found, it will be rerouted to a companion ohcicontroller.
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