+#ifdef CONFIG_PCISLAVE
+
+#define PCI_FUNCTION_CONFIG 0x44
+#define PCI_FUNCTION_CFG_LOCK 0x20
+
+/*
+ * Unlock the configuration bit so that the host system can begin booting
+ *
+ * This should be used after you have:
+ * 1) Called mpc83xx_pci_init()
+ * 2) Set up your inbound translation windows to the appropriate size
+ */
+void mpc83xx_pcislave_unlock(int bus)
+{
+ struct pci_controller *hose = &pci_hose[bus];
+ u32 dev;
+ u16 reg16;
+
+ /* Unlock configuration lock in PCI function configuration register */
+ dev = PCI_BDF(hose->first_busno, 0, 0);
+ pci_hose_read_config_word (hose, dev, PCI_FUNCTION_CONFIG, ®16);
+ reg16 &= ~(PCI_FUNCTION_CFG_LOCK);
+ pci_hose_write_config_word (hose, dev, PCI_FUNCTION_CONFIG, reg16);
+
+ /* The configuration bit is now unlocked, so we can scan the bus */
+ hose->last_busno = pci_hose_scan(hose);
+}
+#endif
+