PCIR_SUBBUS_1
PRIV_CFG_WR1(sc, PCIR_SUBBUS_1, sc->bus_end);
#define PCI_SUBORDINATE_BUS PCIR_SUBBUS_1
sub_reg = PCIR_SUBBUS_1;
sub_reg = PCIR_SUBBUS_1;
pci_write_config(dev, PCIR_SUBBUS_1,
PCIR_SUBBUS_1, 1);
cfg->bridge.br_subbus = REG(PCIR_SUBBUS_1, 1);
DBI_WR1(sc, PCIR_SUBBUS_1, sc->bus_end);
uint8_t subbus = pci_read_config(pcib, PCIR_SUBBUS_1, 1);
bus->sub_reg = PCIR_SUBBUS_1;
PCIR_SUBBUS_1, 1);