PCI_MECH1_REQ_PORT
out32(0x80000000, PCI_MECH1_REQ_PORT);
if (0x80000000 == in32(PCI_MECH1_REQ_PORT)) {
out32(PCI_MECH1_REQ_DATA(bus, device, function, offset), PCI_MECH1_REQ_PORT);
out32(PCI_MECH1_REQ_DATA(bus, device, function, offset), PCI_MECH1_REQ_PORT);