XHCI_ERDP_HI
XRWRITE4(sc, XHCI_ERDP_HI(0), (uint32_t)(paddr >> 32));
XRREAD4(sc, XHCI_ERDP_HI(0)), XRREAD4(sc, XHCI_ERDP_LO(0))));
XRWRITE4(sc, XHCI_ERDP_HI(0), 0);
XRWRITE4(sc, XHCI_ERDP_HI(0), 0);
XRWRITE4(sc, XHCI_ERDP_HI(0), (uint32_t)(paddr >> 32));