TQM885D: Exchanged SDRAM timing by a more relaxed timing.

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: Martin Krause <martin.krause@tqs.de>

diff --git a/board/tqm8xx/tqm8xx.c b/board/tqm8xx/tqm8xx.c
index cebdcc07649d80164568e92e6e5dde99b7049580..06bf5f8ee232b2ba7dcf850de41ab560483d6553 100644 (file)
--- 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 101d5f9cb35a2fa9909cd9d3df1db8ffa8c0947d..11b089330b89ef238b5fbc2cc3ba96dc73b71988 100644 (file)
--- a/cpu/mpc8xx/speed.c
+++ b/cpu/mpc8xx/speed.c
@@ -259,11 +259,8 @@ 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 dd26d542627b5ba67e04c5c160199895f47b629a..e0c69652bb2e494ec02e54403bbbfc4bbc13b030 100644 (file)
--- 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)  */