S3C6400/SMDK6400: fix stack_setup in start.S

Fix stack_setup to place the stack on the correct address in DRAM
accroding to U-Boot standard and remove conditional compilation by
CONFIG_MEMORY_UPPER_CODE macro that is not necessry. This macro
was introduced and used only by this board for some unclear reason.

The definition of this macro is also removed because it's not
referenced elsewhere.

Signed-off-by: Seunghyeon Rhee <seunghyeon@lpmtec.com>
Tested-by: Minkyu Kang <mk7.kang@samsung.com>

cpu/arm1176/start.S

@@ -241,16 +241,11 @@ mmu_enable:
 skip_hw_init:
 	/* Set up the stack						    */
 stack_setup:
-#ifdef CONFIG_MEMORY_UPPER_CODE
-	ldr	sp, =(CONFIG_SYS_UBOOT_BASE + CONFIG_SYS_UBOOT_SIZE - 0xc)
-#else
-	ldr	r0, _TEXT_BASE		/* upper 128 KiB: relocated uboot   */
+	ldr	r0, =CONFIG_SYS_UBOOT_BASE	/* base of copy in DRAM	    */
 	sub	r0, r0, #CONFIG_SYS_MALLOC_LEN	/* malloc area                      */
 	sub	r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo                        */
 	sub	sp, r0, #12		/* leave 3 words for abort-stack    */
 
-#endif
-
 clear_bss:
 	ldr	r0, _bss_start		/* find start of bss segment        */
 	ldr	r1, _bss_end		/* stop here                        */

include/configs/smdk6400.h

@@ -49,8 +49,6 @@
 #define CONFIG_ENABLE_MMU
 #endif
 
-#define CONFIG_MEMORY_UPPER_CODE
-
 #define CONFIG_SETUP_MEMORY_TAGS
 #define CONFIG_CMDLINE_TAG
 #define CONFIG_INITRD_TAG