OHCI_HCCA_SIZE
err = usb_allocmem(sc->sc_bus.ub_dmatag, OHCI_HCCA_SIZE,
memset(sc->sc_hcca, 0, OHCI_HCCA_SIZE);
usb_syncmem(&sc->sc_hccadma, 0, OHCI_HCCA_SIZE,