diff --git a/include/configs/CPCI405.h b/include/configs/CPCI405.h
index f032a8d..fca6de0 100644
--- a/include/configs/CPCI405.h
+++ b/include/configs/CPCI405.h
@@ -171,6 +171,8 @@
 #define CONFIG_SYS_PCI_PTM2MS  0xffc00001      /* 4MB, enable                  */
 #define CONFIG_SYS_PCI_PTM2PCI 0x04000000      /* Host: use this pci address   */
 
+#define CONFIG_PCI_4xx_PTM_OVERWRITE	1 /* overwrite PTMx settings by env */
+
 /*-----------------------------------------------------------------------
  * IDE/ATA stuff
  *-----------------------------------------------------------------------
diff --git a/include/configs/CPCI4052.h b/include/configs/CPCI4052.h
index daa3c19..fd04566 100644
--- a/include/configs/CPCI4052.h
+++ b/include/configs/CPCI4052.h
@@ -192,6 +192,8 @@
 #define CONFIG_SYS_PCI_PTM2MS  0xffc00001      /* 4MB, enable                  */
 #define CONFIG_SYS_PCI_PTM2PCI 0x04000000      /* Host: use this pci address   */
 
+#define CONFIG_PCI_4xx_PTM_OVERWRITE	1 /* overwrite PTMx settings by env */
+
 /*-----------------------------------------------------------------------
  * IDE/ATA stuff
  *-----------------------------------------------------------------------
diff --git a/include/configs/CPCI405AB.h b/include/configs/CPCI405AB.h
index 41795a7..d718ed4 100644
--- a/include/configs/CPCI405AB.h
+++ b/include/configs/CPCI405AB.h
@@ -189,6 +189,8 @@
 #define CONFIG_SYS_PCI_PTM2MS	0xffc00001	/* 4MB, enable			*/
 #define CONFIG_SYS_PCI_PTM2PCI 0x04000000	/* Host: use this pci address	*/
 
+#define CONFIG_PCI_4xx_PTM_OVERWRITE	1 /* overwrite PTMx settings by env */
+
 /*-----------------------------------------------------------------------
  * IDE/ATA stuff
  *-----------------------------------------------------------------------
diff --git a/include/configs/CPCI405DT.h b/include/configs/CPCI405DT.h
index 2333208..09df470 100644
--- a/include/configs/CPCI405DT.h
+++ b/include/configs/CPCI405DT.h
@@ -193,6 +193,8 @@
 #define CONFIG_SYS_PCI_PTM2MS  0xffc00001      /* 4MB, enable                  */
 #define CONFIG_SYS_PCI_PTM2PCI 0x04000000      /* Host: use this pci address   */
 
+#define CONFIG_PCI_4xx_PTM_OVERWRITE	1 /* overwrite PTMx settings by env */
+
 /*-----------------------------------------------------------------------
  * IDE/ATA stuff
  *-----------------------------------------------------------------------
diff --git a/include/configs/PMC405.h b/include/configs/PMC405.h
index a9e7134..87ea7b6 100644
--- a/include/configs/PMC405.h
+++ b/include/configs/PMC405.h
@@ -181,6 +181,8 @@
 #define CONFIG_SYS_PCI_PTM2MS  0xff000001	/* 16MB, enable */
 #define CONFIG_SYS_PCI_PTM2PCI 0x00000000	/* Host: use this pci address */
 
+#define CONFIG_PCI_4xx_PTM_OVERWRITE	1 /* overwrite PTMx settings by env */
+
 /*
  * Start addresses for the final memory configuration
  * (Set up by the startup code)
diff --git a/include/configs/PMC405DE.h b/include/configs/PMC405DE.h
index 5232745..7198632 100644
--- a/include/configs/PMC405DE.h
+++ b/include/configs/PMC405DE.h
@@ -164,6 +164,8 @@
 #define CONFIG_SYS_PCI_PTM2MS  0xff000001      /* 16MB, enable=1 */
 #define CONFIG_SYS_PCI_PTM2PCI 0x04000000      /* Host: use this pci address */
 
+#define CONFIG_PCI_4xx_PTM_OVERWRITE	1 /* overwrite PTMx settings by env */
+
 /*
  * For booting Linux, the board info and command line data
  * have to be in the first 8 MB of memory, since this is