diff --git a/include/asm-ppc/immap_512x.h b/include/asm-ppc/immap_512x.h
index 24e6c69..79cdd80 100644
--- a/include/asm-ppc/immap_512x.h
+++ b/include/asm-ppc/immap_512x.h
@@ -341,6 +341,10 @@
 	u32 res2[0x3AD];
 } ddr512x_t;
 
+/* MDDRC SYS CFG and Timing CFG0 Registers */
+#define MDDRC_SYS_CFG_EN	0xF0000000
+#define MDDRC_SYS_CFG_CMD_MASK	0x10000000
+#define MDDRC_REFRESH_ZERO_MASK	0x0000FFFF
 
 /*
  * DMA/Messaging Unit
diff --git a/include/asm-ppc/mpc512x.h b/include/asm-ppc/mpc512x.h
index 20456f5..8ef0d9c 100644
--- a/include/asm-ppc/mpc512x.h
+++ b/include/asm-ppc/mpc512x.h
@@ -50,7 +50,7 @@
 /*
  * Prototypes
  */
-extern long int fixed_sdram(void);
+extern long int fixed_sdram(u32 *mddrc_config, u32 *dram_init_seq, int seq_sz);
 extern int mpc5121_diu_init(void);
 extern void ide_set_reset(int idereset);
 
diff --git a/include/configs/aria.h b/include/configs/aria.h
index 4211113..2938eac 100644
--- a/include/configs/aria.h
+++ b/include/configs/aria.h
@@ -126,7 +126,7 @@
 #define CONFIG_SYS_MDDRC_SYS_CFG     (	(1 << 31) |	/* RST_B */ \
 					(1 << 30) |	/* CKE */ \
 					(1 << 29) |	/* CLK_ON */ \
-					(1 << 28) |	/* CMD_MODE */ \
+					(0 << 28) |	/* CMD_MODE */ \
 					(4 << 25) |	/* DRAM_ROW_SELECT */ \
 					(3 << 21) |	/* DRAM_BANK_SELECT */ \
 					(0 << 18) |	/* SELF_REF_EN */ \
@@ -143,16 +143,12 @@
 					(0 <<  0) 	/* FIFO_UV_EN */ \
 				     )
 
-#define CONFIG_SYS_MDDRC_SYS_CFG_RUN	(CONFIG_SYS_MDDRC_SYS_CFG & ~(1 << 28))
+#define CONFIG_SYS_MDDRC_TIME_CFG0	0x030C3D2E
 #define CONFIG_SYS_MDDRC_TIME_CFG1	0x55D81189
 #define CONFIG_SYS_MDDRC_TIME_CFG2	0x34790863
 
-#define CONFIG_SYS_MDDRC_SYS_CFG_EN	0xF0000000
-#define CONFIG_SYS_MDDRC_TIME_CFG0	0x00003D2E
-#define CONFIG_SYS_MDDRC_TIME_CFG0_RUN	0x030C3D2E
-
-#define CONFIG_SYS_MICRON_NOP		0x01380000
-#define CONFIG_SYS_MICRON_PCHG_ALL	0x01100400
+#define CONFIG_SYS_DDRCMD_NOP		0x01380000
+#define CONFIG_SYS_DDRCMD_PCHG_ALL	0x01100400
 #define CONFIG_SYS_MICRON_EMR	     (	(1 << 24) |	/* CMD_REQ */ \
 					(0 << 22) |	/* DRAM_CS */ \
 					(0 << 21) |	/* DRAM_RAS */ \
@@ -172,7 +168,7 @@
 				     )
 #define CONFIG_SYS_MICRON_EMR2		0x01020000
 #define CONFIG_SYS_MICRON_EMR3		0x01030000
-#define CONFIG_SYS_MICRON_RFSH		0x01080000
+#define CONFIG_SYS_DDRCMD_RFSH		0x01080000
 #define CONFIG_SYS_MICRON_INIT_DEV_OP	0x01000432
 #define CONFIG_SYS_MICRON_EMR_OCD    (	(1 << 24) |	/* CMD_REQ */ \
 					(0 << 22) |	/* DRAM_CS */ \
@@ -196,10 +192,10 @@
  * Backward compatible definitions,
  * so we do not have to change cpu/mpc512x/fixed_sdram.c
  */
-#define	CONFIG_SYS_MICRON_EM2		(CONFIG_SYS_MICRON_EMR2)
-#define CONFIG_SYS_MICRON_EM3		(CONFIG_SYS_MICRON_EMR3)
-#define CONFIG_SYS_MICRON_EN_DLL	(CONFIG_SYS_MICRON_EMR)
-#define CONFIG_SYS_MICRON_OCD_DEFAULT	(CONFIG_SYS_MICRON_EMR_OCD)
+#define	CONFIG_SYS_DDRCMD_EM2		(CONFIG_SYS_MICRON_EMR2)
+#define CONFIG_SYS_DDRCMD_EM3		(CONFIG_SYS_MICRON_EMR3)
+#define CONFIG_SYS_DDRCMD_EN_DLL	(CONFIG_SYS_MICRON_EMR)
+#define CONFIG_SYS_DDRCMD_OCD_DEFAULT	(CONFIG_SYS_MICRON_EMR_OCD)
 
 /* DDR Priority Manager Configuration */
 #define CONFIG_SYS_MDDRCGRP_PM_CFG1	0x00077777
diff --git a/include/configs/mecp5123.h b/include/configs/mecp5123.h
index 1ecae00..e194c8f 100644
--- a/include/configs/mecp5123.h
+++ b/include/configs/mecp5123.h
@@ -111,22 +111,19 @@
  *	[09:05]	DRAM tRP:
  *	[04:00] DRAM tRPA
  */
-#define CONFIG_SYS_MDDRC_SYS_CFG	 0xFA804A00
-#define CONFIG_SYS_MDDRC_SYS_CFG_RUN	 0xEA804A00
+#define CONFIG_SYS_MDDRC_SYS_CFG	 0xEA804A00
+#define CONFIG_SYS_MDDRC_TIME_CFG0	 0x06183D2E
 #define CONFIG_SYS_MDDRC_TIME_CFG1	 0x68EC1168
 #define CONFIG_SYS_MDDRC_TIME_CFG2	 0x34310864
-#define CONFIG_SYS_MDDRC_SYS_CFG_EN	0xF0000000
-#define CONFIG_SYS_MDDRC_TIME_CFG0	0x00003D2E
-#define CONFIG_SYS_MDDRC_TIME_CFG0_RUN	0x06183D2E
 
-#define CONFIG_SYS_MICRON_NOP		0x01380000
-#define CONFIG_SYS_MICRON_PCHG_ALL	0x01100400
-#define CONFIG_SYS_MICRON_EM2		0x01020000
-#define CONFIG_SYS_MICRON_EM3		0x01030000
-#define CONFIG_SYS_MICRON_EN_DLL	0x01010000
-#define CONFIG_SYS_MICRON_RFSH		0x01080000
+#define CONFIG_SYS_DDRCMD_NOP		0x01380000
+#define CONFIG_SYS_DDRCMD_PCHG_ALL	0x01100400
+#define CONFIG_SYS_DDRCMD_EM2		0x01020000
+#define CONFIG_SYS_DDRCMD_EM3		0x01030000
+#define CONFIG_SYS_DDRCMD_EN_DLL	0x01010000
+#define CONFIG_SYS_DDRCMD_RFSH		0x01080000
 #define CONFIG_SYS_MICRON_INIT_DEV_OP	0x01000432
-#define CONFIG_SYS_MICRON_OCD_DEFAULT	0x01010780
+#define CONFIG_SYS_DDRCMD_OCD_DEFAULT	0x01010780
 
 /* DDR Priority Manager Configuration */
 #define CONFIG_SYS_MDDRCGRP_PM_CFG1	0x00077777
diff --git a/include/configs/mpc5121ads.h b/include/configs/mpc5121ads.h
index 76f174d..0c871c9 100644
--- a/include/configs/mpc5121ads.h
+++ b/include/configs/mpc5121ads.h
@@ -131,28 +131,24 @@
  *	[04:00] DRAM tRPA
  */
 #ifdef CONFIG_MPC5121ADS_REV2
-#define CONFIG_SYS_MDDRC_SYS_CFG	0xF8604A00
-#define CONFIG_SYS_MDDRC_SYS_CFG_RUN	0xE8604A00
+#define CONFIG_SYS_MDDRC_SYS_CFG	0xE8604A00
 #define CONFIG_SYS_MDDRC_TIME_CFG1	0x54EC1168
 #define CONFIG_SYS_MDDRC_TIME_CFG2	0x35210864
 #else
-#define CONFIG_SYS_MDDRC_SYS_CFG	 0xFA804A00
-#define CONFIG_SYS_MDDRC_SYS_CFG_RUN	 0xEA804A00
-#define CONFIG_SYS_MDDRC_TIME_CFG1	 0x68EC1168
-#define CONFIG_SYS_MDDRC_TIME_CFG2	 0x34310864
+#define CONFIG_SYS_MDDRC_SYS_CFG	0xEA804A00
+#define CONFIG_SYS_MDDRC_TIME_CFG1	0x68EC1168
+#define CONFIG_SYS_MDDRC_TIME_CFG2	0x34310864
 #endif
-#define CONFIG_SYS_MDDRC_SYS_CFG_EN	0xF0000000
-#define CONFIG_SYS_MDDRC_TIME_CFG0	0x00003D2E
-#define CONFIG_SYS_MDDRC_TIME_CFG0_RUN	0x06183D2E
+#define CONFIG_SYS_MDDRC_TIME_CFG0	0x06183D2E
 
-#define CONFIG_SYS_MICRON_NOP		0x01380000
-#define CONFIG_SYS_MICRON_PCHG_ALL	0x01100400
-#define CONFIG_SYS_MICRON_EM2		0x01020000
-#define CONFIG_SYS_MICRON_EM3		0x01030000
-#define CONFIG_SYS_MICRON_EN_DLL	0x01010000
-#define CONFIG_SYS_MICRON_RFSH		0x01080000
+#define CONFIG_SYS_DDRCMD_NOP		0x01380000
+#define CONFIG_SYS_DDRCMD_PCHG_ALL	0x01100400
+#define CONFIG_SYS_DDRCMD_EM2		0x01020000
+#define CONFIG_SYS_DDRCMD_EM3		0x01030000
+#define CONFIG_SYS_DDRCMD_EN_DLL	0x01010000
+#define CONFIG_SYS_DDRCMD_RFSH		0x01080000
 #define CONFIG_SYS_MICRON_INIT_DEV_OP	0x01000432
-#define CONFIG_SYS_MICRON_OCD_DEFAULT	0x01010780
+#define CONFIG_SYS_DDRCMD_OCD_DEFAULT	0x01010780
 
 /* DDR Priority Manager Configuration */
 #define CONFIG_SYS_MDDRCGRP_PM_CFG1	0x00077777