arm, davinci: add NOR Boot Configuration Word

to add the "NOR Boot Configuration Word" on AM18xx based boards,
define CONFIG_SYS_DV_NOR_BOOT_CFG.

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Paulraj Sandeep <s-paulraj@ti.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
diff --git a/arch/arm/cpu/arm926ejs/start.S b/arch/arm/cpu/arm926ejs/start.S
index d164d6d..5e30745 100644
--- a/arch/arm/cpu/arm926ejs/start.S
+++ b/arch/arm/cpu/arm926ejs/start.S
@@ -51,9 +51,18 @@
  */
 
 
+#ifdef CONFIG_SYS_DV_NOR_BOOT_CFG
+.globl _start
+_start:
+.globl _NOR_BOOT_CFG
+_NOR_BOOT_CFG:
+	.word	CONFIG_SYS_DV_NOR_BOOT_CFG
+	b	reset
+#else
 .globl _start
 _start:
 	b	reset
+#endif
 #ifdef CONFIG_SPL_BUILD
 /* No exception handlers in preloader */
 	ldr	pc, _hang