PCIE_T6020_PORT_RID2SID
PWRITE4(sc, port, PCIE_T6020_PORT_RID2SID(idx), 0);
reg = PREAD4(sc, port, PCIE_T6020_PORT_RID2SID(idx));
PWRITE4(sc, port, PCIE_T6020_PORT_RID2SID(idx), reg);
if (PREAD4(sc, port, PCIE_T6020_PORT_RID2SID(idx)) != reg)