[U-Boot-Users] [PATCH] PPC4xx: Correct SDRAM_MCSTAT for PPC405EX(r)
Grant Erickson
gerickson at nuovations.com
Wed Jul 9 18:58:11 CEST 2008
While the PowerPC 405EX(r) shares in common the AMCC/IBM DDR2 SDRAM
controller core also used in the 440SP, 440SPe, 460EX, and 460GT, in
the 405EX(r), SDRAM_MCSTAT has a different DCR value.
Its present value on the 405EX(r) causes a read back of 0xFFFFFFFF
which causes SDRAM initialization to periodically fail since it can
prematurely indicate SDRAM ready status.
Signed-off-by: Grant Erickson <gerickson at nuovations.com>
---
include/asm-ppc/ppc4xx-sdram.h | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/include/asm-ppc/ppc4xx-sdram.h b/include/asm-ppc/ppc4xx-sdram.h
index 8a064df..5cf5ce3 100644
--- a/include/asm-ppc/ppc4xx-sdram.h
+++ b/include/asm-ppc/ppc4xx-sdram.h
@@ -353,7 +353,10 @@
/*
* Memory controller registers
*/
+#ifndef CONFIG_405EX
#define SDRAM_MCSTAT 0x14 /* memory controller status */
+#else
+#define SDRAM_MCSTAT 0x1F /* memory controller status */
#define SDRAM_MCOPT1 0x20 /* memory controller options 1 */
#define SDRAM_MCOPT2 0x21 /* memory controller options 2 */
#define SDRAM_MODT0 0x22 /* on die termination for bank 0 */
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