FIPE_MC_THRTLOW
pci_config_put8(fipe_mc_ctrl.mc_pci_hdl, FIPE_MC_THRTLOW, throttle);
pci_config_put8(fipe_mc_ctrl.mc_pci_hdl, FIPE_MC_THRTLOW,
fipe_mc_ctrl.mc_thrtlow = pci_config_get8(handle, FIPE_MC_THRTLOW);