diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index 8671d1d..102a9db 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -700,6 +700,8 @@
 		case DEVWD_8:  ret *= 2;
 		case DEVWD_16: break;
 	}
+	if ((ddrctl & 0xc000) == 0x4000)
+		ret *= 2;
 	return ret;
 #endif
 	BUG();