diff --git a/Makefile.inc b/Makefile.inc
index aab1efbcd2..ab7248a1a1 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -112,6 +112,7 @@ spc :=
 spc +=
 $(spc) :=
 $(spc) +=
+comma := ,
 
 # files-in-dir-recursive,dir,files
 files-in-dir-recursive=$(filter $(1)%,$(2))
diff --git a/src/vendorcode/google/chromeos/vboot2/Makefile.inc b/src/vendorcode/google/chromeos/vboot2/Makefile.inc
index fdb0d4e954..34f1f745dc 100644
--- a/src/vendorcode/google/chromeos/vboot2/Makefile.inc
+++ b/src/vendorcode/google/chromeos/vboot2/Makefile.inc
@@ -85,3 +85,14 @@ else
 romstage-srcs += $(objgenerated)/libverstage.a
 endif
 endif # CONFIG_SEPARATE_VERSTAGE
+
+# Define a list of files that need to be in RO only.
+# All other files will be installed into RO and RW regions
+# Use $(sort) to cut down on extra spaces that would be translated to commas
+regions-for-file = $(subst $(spc),$(comma),$(sort \
+	$(if $(filter \
+		$(if $(filter y,$(CONFIG_VBOOT_STARTS_IN_BOOTBLOCK)),, \
+			%/romstage) \
+		mts \
+		%/verstage \
+		,$(1)),COREBOOT,COREBOOT FW_MAIN_A FW_MAIN_B)))