So that they can be redefined by some boards specific values.

Signed-off-by: Valentin Longchamp <valentin.longch...@keymile.com>
Signed-off-by: Holger Brunck <holger.bru...@keymile.com>
cc: Gerlando Falauto <gerlando.fala...@keymile.com>
cc: Prafulla Wadaskar <prafu...@marvell.com>
---
 arch/arm/include/asm/arch-kirkwood/config.h |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/arm/include/asm/arch-kirkwood/config.h 
b/arch/arm/include/asm/arch-kirkwood/config.h
index 91164eb..a9499b7 100644
--- a/arch/arm/include/asm/arch-kirkwood/config.h
+++ b/arch/arm/include/asm/arch-kirkwood/config.h
@@ -82,9 +82,15 @@
 #ifdef CONFIG_CMD_SF
 #define CONFIG_HARD_SPI                        1
 #define CONFIG_KIRKWOOD_SPI            1
-#define CONFIG_ENV_SPI_BUS             0
-#define CONFIG_ENV_SPI_CS              0
-#define CONFIG_ENV_SPI_MAX_HZ          50000000        /*50Mhz */
+#ifndef CONFIG_ENV_SPI_BUS
+# define CONFIG_ENV_SPI_BUS            0
+#endif
+#ifndef CONFIG_ENV_SPI_CS
+# define CONFIG_ENV_SPI_CS             0
+#endif
+#ifndef CONFIG_ENV_SPI_MAX_HZ
+# define CONFIG_ENV_SPI_MAX_HZ         50000000
+#endif
 #endif
 
 /*
-- 
1.7.1

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