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9720d9c51c
It is defined using the `ROM_RESERVED` variable. This should allow supporting arduino bootloader that is stored at the end of the ROM.
40 lines
1.7 KiB
Makefile
40 lines
1.7 KiB
Makefile
# Target architecture for the build. Use avr if you are unsure.
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export TARGET_ARCH ?= avr
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export CFLAGS_CPU = -mmcu=$(CPU) $(CFLAGS_FPU)
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export CFLAGS_LINK = -ffunction-sections -fdata-sections -fno-builtin -fshort-enums
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export CFLAGS_DBG ?= -ggdb -g3
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export CFLAGS_OPT ?= -Os
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export CFLAGS += $(CFLAGS_CPU) $(CFLAGS_LINK) $(CFLAGS_DBG) $(CFLAGS_OPT)
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export ASFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG)
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export LINKFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG) $(CFLAGS_OPT) -static -lgcc -e reset_handler -Wl,--gc-sections
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# export the peripheral drivers to be linked into the final binary
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export USEMODULE += atmega_common_periph
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export USEMODULE += periph_common
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# the atmel port uses stdio_uart
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export USEMODULE += stdio_uart
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# include module specific includes
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export INCLUDES += -I$(RIOTCPU)/atmega_common/include -isystem$(RIOTCPU)/atmega_common/include/vendor
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ifeq ($(LTO),1)
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# avr-gcc <4.8.3 has a bug when using LTO which causes a warning to be printed always:
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# '_vector_25' appears to be a misspelled signal handler [enabled by default]
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# See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59396
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export LINKFLAGS += -Wno-error
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endif
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# Use ROM_LEN and RAM_LEN during link
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$(if $(ROM_LEN),,$(error ROM_LEN is not defined))
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$(if $(RAM_LEN),,$(error RAM_LEN is not defined))
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LINKFLAGS += $(LINKFLAGPREFIX)--defsym=__TEXT_REGION_LENGTH__=$(ROM_LEN)$(if $(ROM_RESERVED),-$(ROM_RESERVED))
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LINKFLAGS += $(LINKFLAGPREFIX)--defsym=__DATA_REGION_LENGTH__=$(RAM_LEN)
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# Use newer linker script to have ROM/RAM configuration symbols in binutils<2.26
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LDSCRIPT_COMPAT = $(if $(shell $(TARGET_ARCH)-ld --verbose | grep __TEXT_REGION_LENGTH__),,\
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-T$(RIOTCPU)/$(CPU)/ldscripts_compat/avr_2.26.ld)
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LINKFLAGS += $(LDSCRIPT_COMPAT)
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