Change PLATFORM_ROOT to TF_PLATFORM_ROOT
Since we use "?=" to set PLATFORM_ROOT, it is better to change the
name to be more special, or else it may be overridden by some
environment variables, such as in some CI build environments.
Signed-off-by: Heyi Guo <heyi.guo@linaro.org>
diff --git a/tools/cert_create/Makefile b/tools/cert_create/Makefile
index 437b692..b0994b8 100644
--- a/tools/cert_create/Makefile
+++ b/tools/cert_create/Makefile
@@ -35,7 +35,7 @@
else
PLAT_MSG := ${PLAT}
-PLATFORM_ROOT := ../../plat/
+TF_PLATFORM_ROOT := ../../plat/
include ${MAKE_HELPERS_DIRECTORY}plat_helpers.mk
PLAT_INCLUDE := $(wildcard ${PLAT_DIR}include)