diff --git a/include/asm-ppc/config.h b/include/asm-ppc/config.h
index 6d27cb1..2a4ee15 100644
--- a/include/asm-ppc/config.h
+++ b/include/asm-ppc/config.h
@@ -22,10 +22,10 @@
 #define _ASM_CONFIG_H_
 
 #ifndef CONFIG_MAX_MEM_MAPPED
-#if defined(CONFIG_SDRAM_PPC4xx_IBM_DDR2) && defined(CONFIG_SPD_EEPROM)
+#if defined(CONFIG_4xx)
 #define CONFIG_MAX_MEM_MAPPED	((phys_size_t)2 << 30)
 #else
-#define CONFIG_MAX_MEM_MAPPED (256 << 20)
+#define CONFIG_MAX_MEM_MAPPED	(256 << 20)
 #endif
 #endif
 
diff --git a/include/configs/katmai.h b/include/configs/katmai.h
index ea6cf0d..0d89594 100644
--- a/include/configs/katmai.h
+++ b/include/configs/katmai.h
@@ -45,7 +45,6 @@
  */
 #define CONFIG_PHYS_64BIT
 #define	CONFIG_VERY_BIG_RAM
-#define CONFIG_MAX_MEM_MAPPED	((phys_size_t)2 << 30)
 
 /*
  * Include common defines/options for all AMCC eval boards