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-rw-r--r--tools/make/cpu/cortex-m4.mk2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/make/cpu/cortex-m4.mk b/tools/make/cpu/cortex-m4.mk
index fabe05632..d8776b5d8 100644
--- a/tools/make/cpu/cortex-m4.mk
+++ b/tools/make/cpu/cortex-m4.mk
@@ -10,4 +10,4 @@ else ifeq ($(TOOLCHAIN),iar)
ASFLAGS += --cpu cortex-m4 --fpu VFPv4
endif
-FREERTOS_PORTABLE_SRC = $(FREERTOS_PORTABLE_PATH)/ARM_CM4F
+FREERTOS_PORTABLE_SRC ?= $(FREERTOS_PORTABLE_PATH)/ARM_CM4F