Index: linux-2.6.21.7/drivers/mmc/at91_mci.c
===================================================================
--- linux-2.6.21.7.orig/drivers/mmc/at91_mci.c
+++ linux-2.6.21.7/drivers/mmc/at91_mci.c
@@ -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)