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authorDave Liu <r63238@freescale.com>2008-01-10 23:07:23 +0800
committerKim Phillips <kim.phillips@freescale.com>2008-01-10 21:23:26 -0600
commit7e74d63d1a211fbc34ec424e2dc6726601f323d0 (patch)
treed3a83a96f4e644b7f52a92243f232a0571545b52 /include/configs
parent6f3931a2bed5412c20d5e5536c865fbd657f7d28 (diff)
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mpc83xx: Reduce the latency of DDR
Reduce the AL from 2 to 1 clock to improve the performance. Signed-off-by: Dave Liu <daveliu@freescale.com> Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Diffstat (limited to 'include/configs')
-rw-r--r--include/configs/MPC837XEMDS.h10
1 files changed, 5 insertions, 5 deletions
diff --git a/include/configs/MPC837XEMDS.h b/include/configs/MPC837XEMDS.h
index 46fc239..0b4e562 100644
--- a/include/configs/MPC837XEMDS.h
+++ b/include/configs/MPC837XEMDS.h
@@ -132,7 +132,7 @@
#else
/*
* Manually set up DDR parameters
- * WHITE ELECTRONIC DESGGNS - W3HG64M72EEU403PD4 SO-DIMM
+ * WHITE ELECTRONIC DESIGNS - W3HG64M72EEU403PD4 SO-DIMM
* consist of nine chips from SAMSUNG K4T51083QE-ZC(L)D5
*/
#define CFG_DDR_SIZE 512 /* MB */
@@ -160,22 +160,22 @@
| ( 2 << TIMING_CFG1_ACTTOACT_SHIFT ) \
| ( 2 << TIMING_CFG1_WRTORD_SHIFT ) )
/* 0x3935d322 */
-#define CFG_DDR_TIMING_2 ( ( 2 << TIMING_CFG2_ADD_LAT_SHIFT ) \
+#define CFG_DDR_TIMING_2 ( ( 1 << TIMING_CFG2_ADD_LAT_SHIFT ) \
| ( 6 << TIMING_CFG2_CPO_SHIFT ) \
| ( 2 << TIMING_CFG2_WR_LAT_DELAY_SHIFT ) \
| ( 4 << TIMING_CFG2_RD_TO_PRE_SHIFT ) \
| ( 2 << TIMING_CFG2_WR_DATA_DELAY_SHIFT ) \
| ( 3 << TIMING_CFG2_CKE_PLS_SHIFT ) \
| ( 8 << TIMING_CFG2_FOUR_ACT_SHIFT) )
- /* 0x231088c8 */
+ /* 0x131088c8 */
#define CFG_DDR_INTERVAL ( ( 0x03E0 << SDRAM_INTERVAL_REFINT_SHIFT ) \
| ( 0x0100 << SDRAM_INTERVAL_BSTOPRE_SHIFT ) )
/* 0x03E00100 */
#define CFG_DDR_SDRAM_CFG 0x43000000
#define CFG_DDR_SDRAM_CFG2 0x00001000 /* 1 posted refresh */
-#define CFG_DDR_MODE ( ( 0x0450 << SDRAM_MODE_ESD_SHIFT ) \
+#define CFG_DDR_MODE ( ( 0x0448 << SDRAM_MODE_ESD_SHIFT ) \
| ( 0x1432 << SDRAM_MODE_SD_SHIFT ) )
- /* ODT 150ohm CL=3, AL=2 on SDRAM */
+ /* ODT 150ohm CL=3, AL=1 on SDRAM */
#define CFG_DDR_MODE2 0x00000000
#endif