diff --git a/arch/powerpc/cpu/mpc512x/fixed_sdram.c b/arch/powerpc/cpu/mpc512x/fixed_sdram.c
index 72d524c..550cbd0 100644
--- a/arch/powerpc/cpu/mpc512x/fixed_sdram.c
+++ b/arch/powerpc/cpu/mpc512x/fixed_sdram.c
@@ -78,7 +78,7 @@
 			u32 *dram_init_seq, int seq_sz)
 {
 	volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
-	u32 msize = CONFIG_SYS_DDR_SIZE * 1024 * 1024;
+	u32 msize = CONFIG_SYS_MAX_RAM_SIZE;
 	u32 msize_log2 = __ilog2(msize);
 	u32 i;
 
@@ -148,5 +148,10 @@
 	out_be32(&im->mddrc.ddr_time_config0, mddrc_config->ddr_time_config0);
 	out_be32(&im->mddrc.ddr_sys_config, mddrc_config->ddr_sys_config);
 
+	msize = get_ram_size(CONFIG_SYS_DDR_BASE, CONFIG_SYS_MAX_RAM_SIZE);
+	/* Fix DDR Local Window for new size */
+	out_be32(&im->sysconf.ddrlaw.ar, __ilog2(msize) - 1);
+	sync_law(&im->sysconf.ddrlaw.ar);
+
 	return msize;
 }
diff --git a/include/configs/aria.h b/include/configs/aria.h
index 7097ab7..c5f9cc1 100644
--- a/include/configs/aria.h
+++ b/include/configs/aria.h
@@ -78,6 +78,7 @@
 #define CONFIG_SYS_DDR_SIZE		256		/* MB */
 #define CONFIG_SYS_DDR_BASE		0x00000000
 #define CONFIG_SYS_SDRAM_BASE		CONFIG_SYS_DDR_BASE
+#define CONFIG_SYS_MAX_RAM_SIZE		0x20000000
 
 #define CONFIG_SYS_IOCTRL_MUX_DDR	0x00000036
 
diff --git a/include/configs/mecp5123.h b/include/configs/mecp5123.h
index cafd6a7..92c4f5f 100644
--- a/include/configs/mecp5123.h
+++ b/include/configs/mecp5123.h
@@ -66,6 +66,7 @@
 
 #define CONFIG_SYS_DDR_BASE		0x00000000	/* DDR is sys memory*/
 #define CONFIG_SYS_SDRAM_BASE		CONFIG_SYS_DDR_BASE
+#define CONFIG_SYS_MAX_RAM_SIZE		0x20000000
 
 #define CONFIG_SYS_IOCTRL_MUX_DDR	0x00000036
 
diff --git a/include/configs/mpc5121ads.h b/include/configs/mpc5121ads.h
index 8ecc9e1..5281042 100644
--- a/include/configs/mpc5121ads.h
+++ b/include/configs/mpc5121ads.h
@@ -85,6 +85,7 @@
 #endif
 #define CONFIG_SYS_DDR_BASE		0x00000000	/* DDR is system memory*/
 #define CONFIG_SYS_SDRAM_BASE		CONFIG_SYS_DDR_BASE
+#define CONFIG_SYS_MAX_RAM_SIZE		0x20000000
 
 #define CONFIG_SYS_IOCTRL_MUX_DDR	0x00000036