PCIB_BCR_SECBUS_RESET
pci_write_config(gpdev, PCIR_BRIDGECTL_1, v | PCIB_BCR_SECBUS_RESET, 2);
bridge_ctl |= PCIB_BCR_SECBUS_RESET;
bridge_ctl &= ~PCIB_BCR_SECBUS_RESET;
brctl |= PCIB_BCR_SECBUS_RESET;
brctl &= ~PCIB_BCR_SECBUS_RESET;