-obj-y += mc146818rtc.o
-obj-y += isa-dma.o
-obj-y += i8259.o
-obj-$(CONFIG_UDELAY_IO) += udelay_io.o
-obj-y += keyboard.o
-initobj-$(CONFIG_USE_OPTION_TABLE) += mc146818rtc_early.o
-initobj-$(CONFIG_CACHE_AS_RAM) += serial.o
+ramstage-y += mc146818rtc.c
+ramstage-y += isa-dma.c
+ramstage-y += i8254.c
+ramstage-y += i8259.c
+ramstage-$(CONFIG_UDELAY_IO) += udelay_io.c
+ramstage-y += keyboard.c
+ramstage-$(CONFIG_TPM) += tpm.c
+
+romstage-$(CONFIG_USE_OPTION_TABLE) += mc146818rtc_early.c