--- linux-2.6.21.1.old/drivers/mmc/at91_mci.c	2007-06-05 11:08:39.000000000 +0200
+++ linux-2.6.21.1/drivers/mmc/at91_mci.c	2007-06-05 11:28:40.000000000 +0200
@@ -79,8 +79,7 @@
 
 #define DRIVER_NAME "at91_mci"
 
-//#undef	SUPPORT_4WIRE
-#define 	SUPPORT_4WIRE
+#undef	SUPPORT_4WIRE
 
 #define FL_SENT_COMMAND	(1 << 0)
 #define FL_SENT_STOP	(1 << 1)