-START := start.o
-SOBJS := entry.o
-COBJS := cpu.o hsdramc.o exception.o cache.o
-COBJS += interrupts.o device.o pm.o pio.o
-SRCS := $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS))
-START := $(addprefix $(obj),$(START))
+START-y += start.o
+
+COBJS-y += cpu.o
+COBJS-y += hsdramc.o
+COBJS-y += exception.o
+COBJS-y += cache.o
+COBJS-y += interrupts.o
+COBJS-y += pio.o
+COBJS-$(CONFIG_MMC) += atmel_mci.o
+
+SRCS := $(START-y:.o=.S) $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
+OBJS := $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))
+START := $(addprefix $(obj),$(START-y))