Patchwork [U-Boot] edb9302(a): Tweak PLL settings

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Submitter Matthias Kaehlcke
Date Feb. 10, 2010, 9:37 p.m.
Message ID <20100210213721.GH374@darwin>
Download mbox | patch
Permalink /patch/71723/
State Not Applicable
Delegated to: Albert ARIBAUD
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Comments

Matthias Kaehlcke - Feb. 10, 2010, 9:37 p.m.
Previous code ran the edb9302(a) boards with the PLL same settings as the
edb9301, at 166MHz core and 66MHz system bus clock. In difference to the edb9301
board the edb9302(a) is equipped with an EP9302 processor, which can be clocked
at higher rates than the EP9301. Therefore we can configure the edb9302(a) with
the same PLL settings as the other non-edb9301 boards, namely at 200MHz for
the core and 100MHz for the system bus clock.

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
---
 board/edb93xx/pll_cfg.h   |    6 +++---
 board/edb93xx/sdram_cfg.h |    7 ++++---
 2 files changed, 7 insertions(+), 6 deletions(-)

Patch

diff --git a/board/edb93xx/pll_cfg.h b/board/edb93xx/pll_cfg.h
index 0b6f469..39d6f5a 100644
--- a/board/edb93xx/pll_cfg.h
+++ b/board/edb93xx/pll_cfg.h
@@ -25,8 +25,7 @@ 
 #include <config.h>
 #include <asm/arch/ep93xx.h>
 
-#if defined(CONFIG_EDB9301) || defined(CONFIG_EDB9302) ||	\
-	defined(CONFIG_EDB9302A)
+#if defined(CONFIG_EDB9301)
 /*
  * fclk_div: 2, nbyp1: 1, hclk_div: 5, pclk_div: 2
  * pll1_x1: 294912000.000000, pll1_x2ip: 36864000.000000,
@@ -39,7 +38,8 @@ 
 			3 << SYSCON_CLKSET1_HCLK_DIV_SHIFT |	\
 			SYSCON_CLKSET1_NBYP1 |			\
 			1 << SYSCON_CLKSET1_FCLK_DIV_SHIFT)
-#elif defined(CONFIG_EDB9307) || defined(CONFIG_EDB9307A) ||	\
+#elif defined(CONFIG_EDB9302) || defined(CONFIG_EDB9302A)	\
+	defined(CONFIG_EDB9307) || defined(CONFIG_EDB9307A) ||	\
 	defined CONFIG_EDB9312 || defined(CONFIG_EDB9315) ||	\
 	defined(CONFIG_EDB9315A)
 /*
diff --git a/board/edb93xx/sdram_cfg.h b/board/edb93xx/sdram_cfg.h
index 757b63c..5a5cf82 100644
--- a/board/edb93xx/sdram_cfg.h
+++ b/board/edb93xx/sdram_cfg.h
@@ -43,12 +43,13 @@ 
  * CLK cycle time min:
  *	@ CAS latency = 3: 7.5ns
  *	@ CAS latency = 2: 10ns
- * We're running at 66MHz (15ns cycle time) external bus speed (HCLK),
- * so it's safe to use CAS latency = 2
+ * We're running at 66MHz (EDB9301) / 100Mhz (EDB9302(a)) external
+ * bus speed (HCLK), with a cycle time of 15ns / 10ns, so it's safe
+ * to use CAS latency = 2
  *
  * RAS-to-CAS delay min:
  *	20ns
- * At 15ns cycle time, we use RAS-to-CAS delay = 2
+ * At 15ns/10ns cycle time, we use RAS-to-CAS delay = 2
  *
  * SROMLL = 1: Swap BA[1:0] with A[13:12], making the SDRAM appear
  * as four blocks of 8MB size, instead of eight blocks of 4MB size: