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-rw-r--r--platforms/avr/bootloader.mk2
1 files changed, 2 insertions, 0 deletions
diff --git a/platforms/avr/bootloader.mk b/platforms/avr/bootloader.mk
index 63fe635d96..36e3fd83db 100644
--- a/platforms/avr/bootloader.mk
+++ b/platforms/avr/bootloader.mk
@@ -37,6 +37,8 @@
# BOOTLOADER_SIZE can still be defined manually, but it's recommended
# you add any possible configuration to this list
+FIRMWARE_FORMAT?=hex
+
ifeq ($(strip $(BOOTLOADER)), custom)
OPT_DEFS += -DBOOTLOADER_CUSTOM
BOOTLOADER_TYPE = custom