diff -Naur linux-4.7.3/arch/avr32/boards/grasshopper/setup.c linux-4.7.3.grasshopper/arch/avr32/boards/grasshopper/setup.c
--- linux-4.7.3/arch/avr32/boards/grasshopper/setup.c	2016-09-14 10:48:53.403638569 +0200
+++ linux-4.7.3.grasshopper/arch/avr32/boards/grasshopper/setup.c	2016-09-14 11:26:49.572343447 +0200
@@ -169,7 +169,7 @@
 #endif
 
 #ifdef CONFIG_MMC_ATMELMCI
-//    at32_add_device_mci(0, &mci0_data); /* MMC/SD */
+    at32_add_device_mci(0, &mci0_data); /* MMC/SD */
 #endif
 
 //    printk("registering penirq gpio-pin...\n");