Enable POST memory test for P2020DS

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

include/configs/P2020DS.h

@@ -77,8 +77,9 @@
 #define CONFIG_SYS_NUM_ADDR_MAP		16	/* number of TLB1 entries */
 #endif
 
-#define CONFIG_SYS_MEMTEST_START	0x00000000	/* memtest works on */
-#define CONFIG_SYS_MEMTEST_END		0x7fffffff
+#define CONFIG_POST CONFIG_SYS_POST_MEMORY	/* test POST memory test */
+#define CONFIG_SYS_MEMTEST_START	0x00200000	/* memtest works on */
+#define CONFIG_SYS_MEMTEST_END		0x00400000
 #define CONFIG_PANIC_HANG	/* do not reset board on panic */
 
 /*