ppc4xx: Disable DDR2 autocalibration on Kilauea for now

PATCH New Stefan Roese 1 participant 1 message Oct 24, 2008

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Stefan Roese

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2008-10-24 06:57 UTC #0 lore raw

PATCH 1/1 ppc4xx: Disable DDR2 autocalibration on Kilauea for now

Since the new autocalibration still has some problems on some Kilauea boards with 200MHz DDR2 frequency we disable the autocalibration and use the hardcoded values as done before. This seems to work reliably on all known DDR2 frequencies.

After the autocalibration issue is fixed we will enable it again.

Signed-off-by Stefan Roese <[email protected]>

---
 include/configs/kilauea.h |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

include/configs/kilauea.h +7 -0

index 237a9c5..b943f31 100644
@@ -235,9 +235,16 @@
  *
  * DDR Autocalibration Method_B is the default.
  */
+#if 0
+/*
+ * Needs FIX!!!
+ * Disable autocalibration for now, because of the unresolved problem
+ * with kilauea board using 200MHz PLB/DDR2 frequency
+ */
 #define	CONFIG_PPC4xx_DDR_AUTOCALIBRATION	/* IBM DDR autocalibration */
 #define	DEBUG_PPC4xx_DDR_AUTOCALIBRATION	/* dynamic DDR autocal debug */
 #undef	CONFIG_PPC4xx_DDR_METHOD_A
+#endif
 
 #define	CONFIG_SYS_SDRAM0_MB0CF_BASE	((  0 << 20) + CONFIG_SYS_SDRAM_BASE)

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