diff --git a/Makefile.inc b/Makefile.inc
index 69ac747800..e3afa89508 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -1134,22 +1134,6 @@ $(obj)/coreboot.rom: $(obj)/coreboot.pre $(RAMSTAGE) $(CBFSTOOL) $$(INTERMEDIATE
 # file (filled with \377 = 0xff) and copy the CBFS image over it.
 	dd if=/dev/zero bs=$(call _toint,$(CONFIG_ROM_SIZE)) count=1 2> /dev/null | tr '\000' '\377' > $@.tmp
 	dd if=$(obj)/coreboot.pre of=$@.tmp bs=8192 conv=notrunc 2> /dev/null
-ifneq ($(CONFIG_SEABIOS_PS2_TIMEOUT),)
-ifneq ($(CONFIG_SEABIOS_PS2_TIMEOUT),0)
-ifneq ($(CONFIG_UPDATE_IMAGE),y)
-	@printf "    SeaBIOS    Wait up to $(CONFIG_SEABIOS_PS2_TIMEOUT) ms for PS/2 keyboard controller initialization\n"
-	$(CBFSTOOL) $@.tmp add-int -i $(CONFIG_SEABIOS_PS2_TIMEOUT) -n etc/ps2-keyboard-spinup
-endif
-endif
-endif
-ifeq ($(CONFIG_SEABIOS_ADD_SERCON_PORT_FILE),y)
-	@printf "    SeaBIOS    Add sercon-port file\n"
-	$(CBFSTOOL) $@.tmp add-int -i $(CONFIG_SEABIOS_SERCON_PORT_ADDR) -n etc/sercon-port
-endif
-ifeq ($(CONFIG_SEABIOS_THREAD_OPTIONROMS),y)
-	@printf "    SeaBIOS    Thread optionroms\n"
-	$(CBFSTOOL) $@.tmp add-int -i 2 -n etc/threads
-endif
 ifeq ($(CONFIG_CPU_INTEL_FIRMWARE_INTERFACE_TABLE),y)
 ifneq ($(CONFIG_UPDATE_IMAGE),y) # never update the bootblock
 ifeq ($(CONFIG_CPU_MICROCODE_CBFS_EXTERNAL_HEADER),y)
diff --git a/payloads/external/Makefile.inc b/payloads/external/Makefile.inc
index da199e4bd3..6208578b74 100644
--- a/payloads/external/Makefile.inc
+++ b/payloads/external/Makefile.inc
@@ -106,6 +106,31 @@ bootorder-file := $(strip $(CONFIG_SEABIOS_BOOTORDER_FILE))
 bootorder-type := raw
 endif
 
+ifneq ($(CONFIG_SEABIOS_PS2_TIMEOUT),)
+ifneq ($(CONFIG_SEABIOS_PS2_TIMEOUT),0)
+ifneq ($(CONFIG_UPDATE_IMAGE),y)
+INTERMEDIATE+=seabios_ps2_timeout
+seabios_ps2_timeout: $(obj)/coreboot.pre $(CBFSTOOL)
+	@printf "    SeaBIOS    Wait up to $(CONFIG_SEABIOS_PS2_TIMEOUT) ms for PS/2 keyboard controller initialization\n"
+	$(CBFSTOOL) $< add-int -i $(CONFIG_SEABIOS_PS2_TIMEOUT) -n etc/ps2-keyboard-spinup
+endif
+endif
+endif
+
+ifeq ($(CONFIG_SEABIOS_ADD_SERCON_PORT_FILE),y)
+INTERMEDIATE+=seabios_sercon
+seabios_sercon: $(obj)/coreboot.pre $(CBFSTOOL)
+	@printf "    SeaBIOS    Add sercon-port file\n"
+#	$(CBFSTOOL) $@.tmp add-int -i $(CONFIG_SEABIOS_SERCON_PORT_ADDR) -n etc/sercon-port
+endif
+
+ifeq ($(CONFIG_SEABIOS_THREAD_OPTIONROMS),y)
+INTERMEDIATE+=seabios_thread_optionroms
+seabios_thread_optionroms: $(obj)/coreboot.pre $(CBFSTOOL)
+	@printf "    SeaBIOS    Thread optionroms\n"
+	$(CBFSTOOL) $@.tmp add-int -i 2 -n etc/threads
+endif
+
 # Depthcharge
 
 payloads/external/depthcharge/depthcharge/build/depthcharge.elf depthcharge: $(DOTCONFIG) $(CBFSTOOL)