arch/x86: Guard option table specific rules with HAVE_OPTION_TABLE

This is inspired by the commit listed below, but rewritten to match
upstream, and split in smaller pieces to keep intent clear.

Change-Id: Ia22c9fcbf8c629d0eb3f1356f80c4565f117d8b8
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Based-On-Change-Id: I50af7dacf616e0f8ff4c43f4acc679089ad7022b
Based-On-Signed-off-by: Julius Werner <jwerner@chromium.org>
Based-On-Reviewed-on: https://chromium-review.googlesource.com/219170
Reviewed-on: http://review.coreboot.org/9110
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc
index 175a767..e6b4bad 100644
--- a/src/arch/x86/Makefile.inc
+++ b/src/arch/x86/Makefile.inc
@@ -29,14 +29,27 @@
 
 DISASSEMBLY=-Wa,--divide
 
+################################################################################
+# i386 specific tools
+NVRAMTOOL:=$(objutil)/nvramtool/nvramtool
+
 OPTION_TABLE_H:=
 ifeq ($(CONFIG_HAVE_OPTION_TABLE),y)
+
 cbfs-files-y += cmos_layout.bin
 cmos_layout.bin-file = $(obj)/cmos_layout.bin
 cmos_layout.bin-type = 0x01aa
 
+$(obj)/cmos_layout.bin: $(NVRAMTOOL) $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.layout
+	@printf "    OPTION     $(subst $(obj)/,,$(@))\n"
+	$(NVRAMTOOL) -y $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.layout -L $@
+
 OPTION_TABLE_H:=$(obj)/option_table.h
-endif
+
+$(OPTION_TABLE_H): $(NVRAMTOOL) $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.layout
+	@printf "    OPTION     $(subst $(obj)/,,$(@))\n"
+	$(NVRAMTOOL) -y $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.layout -H $@
+endif # CONFIG_HAVE_OPTION_TABLE
 
 stripped_vgabios_id = $(call strip_quotes,$(CONFIG_VGA_BIOS_ID))
 cbfs-files-$(CONFIG_VGA_BIOS) += pci$(stripped_vgabios_id).rom
@@ -53,18 +66,6 @@
 CBFSTOOL_PRE_OPTS  = -b $(shell cat $(objcbfs)/base_xip.txt) -S ".car.data"
 endif
 
-################################################################################
-# i386 specific tools
-NVRAMTOOL:=$(objutil)/nvramtool/nvramtool
-
-$(OPTION_TABLE_H): $(NVRAMTOOL) $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.layout
-	@printf "    OPTION     $(subst $(obj)/,,$(@))\n"
-	$(NVRAMTOOL) -y $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.layout -H $@
-
-$(obj)/cmos_layout.bin: $(NVRAMTOOL) $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.layout
-	@printf "    OPTION     $(subst $(obj)/,,$(@))\n"
-	$(NVRAMTOOL) -y $(top)/src/mainboard/$(MAINBOARDDIR)/cmos.layout -L $@
-
 
 ###############################################################################
 # bootblock