# mulle will always select ztimer through requiring nvram_spi module
# because of order of inclusion 'make' depency resolution will still select
# xtimer while 'Kconfig' wont, so early require 'ztimer_usec'
# for 'make' to avoid this
ifneq (,$(filter mulle,$(BOARD)))
  USEMODULE += ztimer_usec
endif