diff --git a/cpu/ppc4xx/4xx_pci.c b/cpu/ppc4xx/4xx_pci.c
index 31ca85dc55..4b5d636bd1 100644
--- a/cpu/ppc4xx/4xx_pci.c
+++ b/cpu/ppc4xx/4xx_pci.c
@@ -87,6 +87,20 @@ DECLARE_GLOBAL_DATA_PTR;
  */
 int __pci_pre_init(struct pci_controller *hose)
 {
+#if defined (CONFIG_405EP)
+	/*
+	 * Enable the internal PCI arbiter by default.
+	 *
+	 * On 405EP CPUs the internal arbiter can be controlled
+	 * by the I2C strapping EEPROM. If you want to do so
+	 * or if you want to disable the arbiter pci_pre_init()
+	 * must be reimplemented without enabling the arbiter.
+	 * The arbiter is enabled in this place because of
+	 * compatibility reasons.
+	 */
+	mtdcr(cpc0_pci, mfdcr(cpc0_pci) | CPC0_PCI_ARBIT_EN);
+#endif /* CONFIG_405EP */
+
 	return 1;
 }
 int pci_pre_init(struct pci_controller *hose) __attribute__((weak, alias("__pci_pre_init")));
@@ -323,8 +337,15 @@ void pci_405gp_init(struct pci_controller *hose)
 	}
 #endif
 
-#if defined(CONFIG_405EP) /* on ppc405ep vendor id is not set */
-	pci_write_config_word(PCIDEVID_405GP, PCI_VENDOR_ID, 0x1014); /* IBM */
+#if defined(CONFIG_405EP)
+	/*
+	 * on ppc405ep vendor/device id is not set
+	 * The user manual says 0x1014 (IBM) / 0x0156 (405GP!)
+	 * are the correct values.
+	 */
+	pci_write_config_word(PCIDEVID_405GP, PCI_VENDOR_ID, PCI_VENDOR_ID_IBM);
+	pci_write_config_word(PCIDEVID_405GP,
+			      PCI_DEVICE_ID, PCI_DEVICE_ID_IBM_405GP);
 #endif
 
 	/*
diff --git a/cpu/ppc4xx/cpu_init.c b/cpu/ppc4xx/cpu_init.c
index 577d33fead..bbd795de2a 100644
--- a/cpu/ppc4xx/cpu_init.c
+++ b/cpu/ppc4xx/cpu_init.c
@@ -174,11 +174,6 @@ cpu_init_f (void)
 	 * Set EMAC noise filter bits
 	 */
 	mtdcr(cpc0_epctl, CPC0_EPRCSR_E0NFE | CPC0_EPRCSR_E1NFE);
-
-	/*
-	 * Enable the internal PCI arbiter
-	 */
-	mtdcr(cpc0_pci, mfdcr(cpc0_pci) | CPC0_PCI_HOST_CFG_EN | CPC0_PCI_ARBIT_EN);
 #endif /* CONFIG_405EP */
 
 #if defined(CONFIG_SYS_4xx_GPIO_TABLE)
diff --git a/include/common.h b/include/common.h
index 7ba6187d6d..a6c7c07692 100644
--- a/include/common.h
+++ b/include/common.h
@@ -275,7 +275,8 @@ void	pci_init_board(void);
 void	pciinfo	      (int, int);
 
 #if defined(CONFIG_PCI) && (defined(CONFIG_4xx) && !defined(CONFIG_AP1000))
-    int	   pci_pre_init	       (struct pci_controller * );
+    int	   pci_pre_init	       (struct pci_controller *);
+    int	   is_pci_host	       (struct pci_controller *);
 #endif
 
 #if defined(CONFIG_PCI) && (defined(CONFIG_440) || defined(CONFIG_405EX))
@@ -285,7 +286,6 @@ void	pciinfo	      (int, int);
 #   if defined(CONFIG_SYS_PCI_MASTER_INIT)
 	void	pci_master_init	     (struct pci_controller *);
 #   endif
-    int	    is_pci_host		(struct pci_controller *);
 #if defined(CONFIG_440SPE) || \
     defined(CONFIG_460EX) || defined(CONFIG_460GT) || \
     defined(CONFIG_405EX)