ppc4xx: Add CONFIG_PCI_4xx_PTM_OVERWRITE to some esd 4xx boards

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd.eu>
Signed-off-by: Stefan Roese <sr@denx.de>
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)