[U-Boot-Users] [PATCH 1/6] TQM885D: Exchanged SDRAM timing by a more relaxed timing.
Martin Krause
martin.krause at tqs.de
Tue Jul 24 11:19:26 CEST 2007
From: Jens Gehrlein <jens.gehrlein at tqs.de>
CAS-Latency=2, Write Recovery Time tWR=2
The max. supported bus frequency is 66 MHz. Therefore, changed
threshold to switch from 1:1 mode to 2:1 from 80 MHz to 66 MHz.
Signed-off-by: Jens Gehrlein <jens.gehrlein at tqs.de>
---
board/tqm8xx/tqm8xx.c | 11 ++++++-----
cpu/mpc8xx/speed.c | 5 +----
include/configs/TQM885D.h | 2 +-
3 files changed, 8 insertions(+), 10 deletions(-)
diff --git a/board/tqm8xx/tqm8xx.c b/board/tqm8xx/tqm8xx.c
index ed1d692..8ef812f 100644
--- a/board/tqm8xx/tqm8xx.c
+++ b/board/tqm8xx/tqm8xx.c
@@ -37,6 +37,7 @@ static long int dram_size (long int, long int *, long int);
#define _NOT_USED_ 0xFFFFFFFF
+/* UPM initialization table for SDRAM: 40, 50, 66 MHz CLKOUT @ CAS latency 2, tWR=2 */
const uint sdram_table[] =
{
/*
@@ -63,14 +64,14 @@ const uint sdram_table[] =
/*
* Single Write. (Offset 18 in UPMA RAM)
*/
- 0x1F0DFC04, 0xEEABBC00, 0x01B27C04, 0x1FF5FC47, /* last */
- _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+ 0x1F0DFC04, 0xEEABBC00, 0x11B77C04, 0xEFFAFC44,
+ 0x1FF5FC47, /* last */
+ _NOT_USED_, _NOT_USED_, _NOT_USED_,
/*
* Burst Write. (Offset 20 in UPMA RAM)
*/
0x1F0DFC04, 0xEEABBC00, 0x10A77C00, 0xF0AFFC00,
- 0xF0AFFC00, 0xE1BAFC04, 0x1FF5FC47, /* last */
- _NOT_USED_,
+ 0xF0AFFC00, 0xF0AFFC04, 0xE1BAFC44, 0x1FF5FC47, /* last */
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
/*
@@ -83,7 +84,7 @@ const uint sdram_table[] =
/*
* Exception. (Offset 3c in UPMA RAM)
*/
- 0x7FFFFC07, /* last */
+ 0xFFFFFC07, /* last */
_NOT_USED_, _NOT_USED_, _NOT_USED_,
};
diff --git a/cpu/mpc8xx/speed.c b/cpu/mpc8xx/speed.c
index 4173092..f23040f 100644
--- a/cpu/mpc8xx/speed.c
+++ b/cpu/mpc8xx/speed.c
@@ -271,11 +271,8 @@ int get_clocks_866 (void)
*/
sccr_reg = immr->im_clkrst.car_sccr;
sccr_reg &= ~SCCR_EBDF11;
-#if defined(CONFIG_TQM885D)
- if (gd->cpu_clk <= 80000000) {
-#else
+
if (gd->cpu_clk <= 66000000) {
-#endif
sccr_reg |= SCCR_EBDF00; /* bus division factor = 1 */
gd->bus_clk = gd->cpu_clk;
} else {
diff --git a/include/configs/TQM885D.h b/include/configs/TQM885D.h
index 9ef0abe..c406df6 100644
--- a/include/configs/TQM885D.h
+++ b/include/configs/TQM885D.h
@@ -42,7 +42,7 @@
#define CONFIG_8xx_OSCLK 10000000 /* 10 MHz - PLL input clock */
#define CFG_8xx_CPUCLK_MIN 15000000 /* 15 MHz - CPU minimum clock */
#define CFG_8xx_CPUCLK_MAX 133000000 /* 133 MHz - CPU maximum clock */
-#define CONFIG_8xx_CPUCLK_DEFAULT 66000000 /* 50 MHz - CPU default clock */
+#define CONFIG_8xx_CPUCLK_DEFAULT 66000000 /* 66 MHz - CPU default clock */
/* (it will be used if there is no */
/* 'cpuclk' variable with valid value) */
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