PCIM_MFDEV
if (pci_host_read_config(sel, PCIR_HDRTYPE, 1) & PCIM_MFDEV)
*rv &= ~PCIM_MFDEV;
*rv |= PCIM_MFDEV;
*rv &= ~(PCIM_MFDEV << 16);
*rv |= (PCIM_MFDEV << 16);