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-rw-r--r--platforms/arm_atsam/bootloader.mk2
1 files changed, 2 insertions, 0 deletions
diff --git a/platforms/arm_atsam/bootloader.mk b/platforms/arm_atsam/bootloader.mk
index 1ec42edeb6..7e503bdca9 100644
--- a/platforms/arm_atsam/bootloader.mk
+++ b/platforms/arm_atsam/bootloader.mk
@@ -27,6 +27,8 @@
# the respective file under `platforms/<PLATFORM>/bootloaders/custom.c` to see
# which functions may be overridden.
+FIRMWARE_FORMAT?=bin
+
ifeq ($(strip $(BOOTLOADER)), custom)
OPT_DEFS += -DBOOTLOADER_CUSTOM
BOOTLOADER_TYPE = custom