PCI_BRIDGE_CONTROL_SECBR
reg | PCI_BRIDGE_CONTROL_SECBR);
busdata | PCI_BRIDGE_CONTROL_SECBR);
bcr |= PCI_BRIDGE_CONTROL_SECBR;
bcr &= ~(PCI_BRIDGE_CONTROL_SECBR);
bcr |= PCI_BRIDGE_CONTROL_SECBR;
onoff("Secondary bus reset", rval, PCI_BRIDGE_CONTROL_SECBR);