The AT91RM9200 has a different bit assignment in PMC MCKR register than
it's successors (verified by Atmel's manuals on AT91RM9200 and AT91SAM926).
AT91RM9200 supports the additional divider of 3.

Signed-off-by: Guido Classen <cla...@gmail.com>

--- u-boot-git/arch/arm/include/asm/arch-at91/at91_pmc.h        2010-11-12 
18:30:31.000000000 +0100
+++ u-boot-ccm2200/arch/arm/include/asm/arch-at91/at91_pmc.h    2010-11-16 
22:00:56.000000000 +0100
@@ -91,10 +91,19 @@
  #define AT91_PMC_MCKR_PRES_64         0x00000018
  #define AT91_PMC_MCKR_PRES_MASK               0x0000001C

+#ifdef CONFIG_AT91RM9200
+#define AT91_PMC_MCKR_MDIV_1           0x00000000
+#define AT91_PMC_MCKR_MDIV_2           0x00000100
+#define AT91_PMC_MCKR_MDIV_3           0x00000200
+#define AT91_PMC_MCKR_MDIV_4           0x00000300
+#define AT91_PMC_MCKR_MDIV_MASK                0x00000300
+#else
  #define AT91_PMC_MCKR_MDIV_1          0x00000000
  #define AT91_PMC_MCKR_MDIV_2          0x00000100
  #define AT91_PMC_MCKR_MDIV_4          0x00000200
  #define AT91_PMC_MCKR_MDIV_MASK               0x00000300
+#endif

  #define AT91_PMC_MCKR_PLLADIV_1               0x00001000
  #define AT91_PMC_MCKR_PLLADIV_2               0x00002000
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