M28: Scan only first 512 MB of DRAM to avoid memory wraparound

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
diff --git a/include/configs/m28evk.h b/include/configs/m28evk.h
index 40845d3..8cd5f31 100644
--- a/include/configs/m28evk.h
+++ b/include/configs/m28evk.h
@@ -86,7 +86,7 @@
  */
 #define	CONFIG_NR_DRAM_BANKS		1		/* 1 bank of DRAM */
 #define	PHYS_SDRAM_1			0x40000000	/* Base address */
-#define	PHYS_SDRAM_1_SIZE		0x40000000	/* Max 1 GB RAM */
+#define	PHYS_SDRAM_1_SIZE		0x20000000	/* Max 512 MB RAM */
 #define	CONFIG_STACKSIZE		0x00010000	/* 128 KB stack */
 #define	CONFIG_SYS_MALLOC_LEN		0x00400000	/* 4 MB for malloc */
 #define	CONFIG_SYS_GBL_DATA_SIZE	128		/* Initial data */