Move DECLARE_GLOBAL_DATA_PTR to file scope

It can be optimised out by the compiler otherwise resulting
in obscure errors like a board not booting.

This has been documented in README since 2006 when these were
first fixed up for GCC 4.x.

Signed-off-by: John Rigby <john.rigby@linaro.org>

Fix some additional places.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-By: Albert ARIBAUD <albert.aribaud@free.fr>
diff --git a/board/samsung/smdk6400/smdk6400.c b/board/samsung/smdk6400/smdk6400.c
index 78aaa9e..35aa40b 100644
--- a/board/samsung/smdk6400/smdk6400.c
+++ b/board/samsung/smdk6400/smdk6400.c
@@ -32,6 +32,8 @@
 #include <netdev.h>
 #include <asm/arch/s3c6400.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 /* ------------------------------------------------------------------------- */
 #define CS8900_Tacs	0x0	/* 0clk		address set-up		*/
 #define CS8900_Tcos	0x4	/* 4clk		chip selection set-up	*/
@@ -63,8 +65,6 @@
 
 int board_init(void)
 {
-	DECLARE_GLOBAL_DATA_PTR;
-
 	cs8900_pre_init();
 
 	/* NOR-flash in SROM0 */
@@ -80,8 +80,6 @@
 
 int dram_init(void)
 {
-	DECLARE_GLOBAL_DATA_PTR;
-
 	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
 	gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;