# This adds an optional AUX slot to flash that can be used to store persistent data.
# It will work with and without riotboot, but the size of the slot must remain fixed across
# firmware versions.

# Size of the AUX slot in Bytes - must align with flash page size
SLOT_AUX_LEN ?= 0
SLOT_AUX_OFFSET ?= $(shell echo $$(($(ROM_LEN:%K=%*1024)-$(SLOT_AUX_LEN))))

LINKFLAGS += $(LINKFLAGPREFIX)--defsym=_slot_aux_offset=$(SLOT_AUX_OFFSET)
LINKFLAGS += $(LINKFLAGPREFIX)--defsym=_slot_aux_len=$(SLOT_AUX_LEN)

ifneq (0, $(SLOT_AUX_LEN))
  CFLAGS += -DCONFIG_SLOT_AUX_OFFSET=$(SLOT_AUX_OFFSET)
  CFLAGS += -DCONFIG_SLOT_AUX_LEN=$(SLOT_AUX_LEN)
endif