stm32f4-gcc-template
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fpu should not soft or hard, but softfp
#CFLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16
CFLAGS += -mfloat-abi=soft
# TODO: hard float was causing an exception; see what's up.
should instead be
CFLAGS += -mfloat-abi=softfp