sh: Add a flag which controls the DDR ECC mode of sh7757lcr

When DDR-ECC is effective, the physical memory which can be used
reduces this boardby half. However, this mode can chenge to disable.
When it was disabled, user can use 512 MB of physical memory.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
CC: "Yoshihiro Shimoda" <yoshihiro.shimoda.uh@renesas.com>
Acked-by: "Yoshihiro Shimoda" <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

board/renesas/sh7757lcr/lowlevel_init.S

@@ -326,12 +326,13 @@ PC_MASK:	.long	0x20000000
 	/* step 26 */
 	wait_DBCMD
 
+#if defined(CONFIG_SH7757LCR_DDR_ECC)
 	/* enable DDR-ECC */
 	write32 ECD_ECDEN_A, ECD_ECDEN_D
 	write32 ECD_INTSR_A, ECD_INTSR_D
 	write32 ECD_SPACER_A, ECD_SPACER_D
 	write32 ECD_MCR_A, ECD_MCR_D
-
+#endif
 	bra	exit_ddr
 	nop
 

include/configs/sh7757lcr.h

@@ -31,6 +31,7 @@
 #define CONFIG_SH_32BIT		1
 #define CONFIG_CPU_SH7757	1
 #define CONFIG_SH7757LCR	1
+#define CONFIG_SH7757LCR_DDR_ECC	1
 
 #define CONFIG_SYS_TEXT_BASE	0x8ef80000
 #define CONFIG_SYS_LDSCRIPT	"board/renesas/sh7757lcr/u-boot.lds"