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[ion] device/usb: add comment on how to turn dfu.bin into dfu.o

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Émilie Feral
2019-04-29 15:40:37 +02:00
parent 611e4e102f
commit 89031af4fd
1 changed files with 8 additions and 0 deletions
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8
ion/src/device/shared/usb/Makefile
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@@ -76,6 +76,14 @@ dfu_src += $(addprefix ion/src/device/shared/drivers/, \
$(BUILD_DIR)/ion/src/device/shared/usb/dfu.elf: LDSCRIPT = ion/src/device/$(MODEL)/usb/dfu.ld
$(BUILD_DIR)/ion/src/device/shared/usb/dfu.elf: $(call object_for,$(usb_src) $(dfu_src))
# In order to link the dfu bootloader inside the epsilon firmware, we need to
# turn the dfu binary (dfu.bin) into an elf object.
# By default, 'objcpy' generates a section 'data' and two symbols to the
# start and the end of the binary input respectively named:
# - '_binary_[file name]_[file extension]_start'
# - '_binary_[file name]_[file extension]_end'.
# For our purpose, dfu.o can go in rodata section and we rename the start and
# end of binary symbols: _dfu_bootloader_flash_[start/end]
$(BUILD_DIR)/ion/src/device/shared/usb/dfu.o: $(BUILD_DIR)/ion/src/device/shared/usb/dfu.bin
@echo "OBJCOPY $@"
$(Q) cd $(dir $<) ; $(OBJCOPY) -I binary -O elf32-littlearm -B arm --rename-section .data=.rodata --redefine-sym _binary_dfu_bin_start=_dfu_bootloader_flash_start --redefine-sym _binary_dfu_bin_end=_dfu_bootloader_flash_end $(notdir $<) $(notdir $@)