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-rw-r--r--tools/make/cpu/cortex-m0.mk2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/make/cpu/cortex-m0.mk b/tools/make/cpu/cortex-m0.mk
index c264802c8..feb0f395b 100644
--- a/tools/make/cpu/cortex-m0.mk
+++ b/tools/make/cpu/cortex-m0.mk
@@ -11,4 +11,4 @@ else ifeq ($(TOOLCHAIN),iar)
endif
# For freeRTOS port source
-FREERTOS_PORTABLE_SRC = $(FREERTOS_PORTABLE_PATH)/ARM_CM0
+FREERTOS_PORTABLE_SRC ?= $(FREERTOS_PORTABLE_PATH)/ARM_CM0