cac_rescan
cac_eisa_match, cac_eisa_attach, NULL, NULL, cac_rescan, NULL, 0);
cac_rescan(sc->sc_dev, NULL, NULL);
int cac_rescan(device_t, const char *, const int *);
cac_pci_match, cac_pci_attach, NULL, NULL, cac_rescan, NULL, 0);