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-rw-r--r--tools/make/cpu/cortex-m3.mk2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/make/cpu/cortex-m3.mk b/tools/make/cpu/cortex-m3.mk
index c81cbace6..7a34b9e04 100644
--- a/tools/make/cpu/cortex-m3.mk
+++ b/tools/make/cpu/cortex-m3.mk
@@ -14,4 +14,4 @@ else ifeq ($(TOOLCHAIN),iar)
endif
# For freeRTOS port source
-FREERTOS_PORTABLE_SRC = $(FREERTOS_PORTABLE_PATH)/ARM_CM3
+FREERTOS_PORTABLE_SRC ?= $(FREERTOS_PORTABLE_PATH)/ARM_CM3