Allow for disabling EEPROM subsystem entirely. (#25173)
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					 8 changed files with 75 additions and 84 deletions
				
			
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			@ -171,80 +171,82 @@ endif
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VALID_EEPROM_DRIVER_TYPES := vendor custom transient i2c spi wear_leveling legacy_stm32_flash
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EEPROM_DRIVER ?= vendor
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ifeq ($(filter $(EEPROM_DRIVER),$(VALID_EEPROM_DRIVER_TYPES)),)
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ifneq ($(strip $(EEPROM_DRIVER)),none)
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  ifeq ($(filter $(EEPROM_DRIVER),$(VALID_EEPROM_DRIVER_TYPES)),)
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  $(call CATASTROPHIC_ERROR,Invalid EEPROM_DRIVER,EEPROM_DRIVER="$(EEPROM_DRIVER)" is not a valid EEPROM driver)
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else
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  OPT_DEFS += -DEEPROM_ENABLE
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  COMMON_VPATH += $(PLATFORM_PATH)/$(PLATFORM_KEY)/$(DRIVER_DIR)/eeprom
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  COMMON_VPATH += $(DRIVER_PATH)/eeprom
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  COMMON_VPATH += $(PLATFORM_COMMON_DIR)
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  ifeq ($(strip $(EEPROM_DRIVER)), custom)
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    # Custom EEPROM implementation -- only needs to implement init/erase/read_block/write_block
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    OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_CUSTOM
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    SRC += eeprom_driver.c
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  else ifeq ($(strip $(EEPROM_DRIVER)), wear_leveling)
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    # Wear-leveling EEPROM implementation
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    OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_WEAR_LEVELING
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    SRC += eeprom_driver.c eeprom_wear_leveling.c
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  else ifeq ($(strip $(EEPROM_DRIVER)), i2c)
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    # External I2C EEPROM implementation
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    OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_I2C
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    I2C_DRIVER_REQUIRED = yes
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    SRC += eeprom_driver.c eeprom_i2c.c
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  else ifeq ($(strip $(EEPROM_DRIVER)), spi)
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    # External SPI EEPROM implementation
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    OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_SPI
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    SPI_DRIVER_REQUIRED = yes
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    SRC += eeprom_driver.c eeprom_spi.c
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  else ifeq ($(strip $(EEPROM_DRIVER)), legacy_stm32_flash)
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    # STM32 Emulated EEPROM, backed by MCU flash (soon to be deprecated)
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    OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_LEGACY_EMULATED_FLASH
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    COMMON_VPATH += $(PLATFORM_PATH)/$(PLATFORM_KEY)/$(DRIVER_DIR)/flash
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    COMMON_VPATH += $(DRIVER_PATH)/flash
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    SRC += eeprom_driver.c eeprom_legacy_emulated_flash.c legacy_flash_ops.c
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  else ifeq ($(strip $(EEPROM_DRIVER)), transient)
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    # Transient EEPROM implementation -- no data storage but provides runtime area for it
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    OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_TRANSIENT
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    SRC += eeprom_driver.c eeprom_transient.c
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  else ifeq ($(strip $(EEPROM_DRIVER)), vendor)
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    # Vendor-implemented EEPROM
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    OPT_DEFS += -DEEPROM_VENDOR
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    ifeq ($(PLATFORM),AVR)
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      # Automatically provided by avr-libc, nothing required
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    else ifeq ($(PLATFORM),CHIBIOS)
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      ifneq ($(filter %_STM32F072xB %_STM32F042x6, $(MCU_SERIES)_$(MCU_LDSCRIPT)),)
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        # STM32 Emulated EEPROM, backed by MCU flash (soon to be deprecated)
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        OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_LEGACY_EMULATED_FLASH
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        COMMON_VPATH += $(PLATFORM_PATH)/$(PLATFORM_KEY)/$(DRIVER_DIR)/flash
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        COMMON_VPATH += $(DRIVER_PATH)/flash
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        SRC += eeprom_driver.c eeprom_legacy_emulated_flash.c legacy_flash_ops.c
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      else ifneq ($(filter $(MCU_SERIES),STM32F1xx STM32F3xx STM32F4xx STM32L4xx STM32G4xx WB32F3G71xx WB32FQ95xx AT32F415 GD32VF103),)
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        # Wear-leveling EEPROM implementation, backed by MCU flash
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        OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_WEAR_LEVELING
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        SRC += eeprom_driver.c eeprom_wear_leveling.c
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        WEAR_LEVELING_DRIVER ?= embedded_flash
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      else ifneq ($(filter $(MCU_SERIES),STM32L0xx STM32L1xx),)
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        # True EEPROM on STM32L0xx, L1xx
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        OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_STM32_L0_L1
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        SRC += eeprom_driver.c eeprom_stm32_L0_L1.c
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      else ifneq ($(filter $(MCU_SERIES),RP2040),)
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        # Wear-leveling EEPROM implementation, backed by RP2040 flash
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        OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_WEAR_LEVELING
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        SRC += eeprom_driver.c eeprom_wear_leveling.c
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        WEAR_LEVELING_DRIVER ?= rp2040_flash
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      else ifneq ($(filter $(MCU_SERIES),KL2x K20x),)
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        # Teensy EEPROM implementations
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        OPT_DEFS += -DEEPROM_KINETIS_FLEXRAM
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        SRC += eeprom_kinetis_flexram.c
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      else
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        # Fall back to transient, i.e. non-persistent
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        OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_TRANSIENT
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        SRC += eeprom_driver.c eeprom_transient.c
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  else
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    OPT_DEFS += -DEEPROM_ENABLE
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    COMMON_VPATH += $(PLATFORM_PATH)/$(PLATFORM_KEY)/$(DRIVER_DIR)/eeprom
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    COMMON_VPATH += $(DRIVER_PATH)/eeprom
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    COMMON_VPATH += $(PLATFORM_COMMON_DIR)
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    ifeq ($(strip $(EEPROM_DRIVER)), custom)
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      # Custom EEPROM implementation -- only needs to implement init/erase/read_block/write_block
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      OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_CUSTOM
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      SRC += eeprom_driver.c
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    else ifeq ($(strip $(EEPROM_DRIVER)), wear_leveling)
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      # Wear-leveling EEPROM implementation
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      OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_WEAR_LEVELING
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      SRC += eeprom_driver.c eeprom_wear_leveling.c
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    else ifeq ($(strip $(EEPROM_DRIVER)), i2c)
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      # External I2C EEPROM implementation
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      OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_I2C
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      I2C_DRIVER_REQUIRED = yes
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      SRC += eeprom_driver.c eeprom_i2c.c
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    else ifeq ($(strip $(EEPROM_DRIVER)), spi)
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      # External SPI EEPROM implementation
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      OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_SPI
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      SPI_DRIVER_REQUIRED = yes
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      SRC += eeprom_driver.c eeprom_spi.c
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    else ifeq ($(strip $(EEPROM_DRIVER)), legacy_stm32_flash)
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      # STM32 Emulated EEPROM, backed by MCU flash (soon to be deprecated)
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      OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_LEGACY_EMULATED_FLASH
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      COMMON_VPATH += $(PLATFORM_PATH)/$(PLATFORM_KEY)/$(DRIVER_DIR)/flash
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      COMMON_VPATH += $(DRIVER_PATH)/flash
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      SRC += eeprom_driver.c eeprom_legacy_emulated_flash.c legacy_flash_ops.c
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    else ifeq ($(strip $(EEPROM_DRIVER)), transient)
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      # Transient EEPROM implementation -- no data storage but provides runtime area for it
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      OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_TRANSIENT
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      SRC += eeprom_driver.c eeprom_transient.c
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    else ifeq ($(strip $(EEPROM_DRIVER)), vendor)
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      # Vendor-implemented EEPROM
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      OPT_DEFS += -DEEPROM_VENDOR
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      ifeq ($(PLATFORM),AVR)
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        # Automatically provided by avr-libc, nothing required
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      else ifeq ($(PLATFORM),CHIBIOS)
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        ifneq ($(filter %_STM32F072xB %_STM32F042x6, $(MCU_SERIES)_$(MCU_LDSCRIPT)),)
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          # STM32 Emulated EEPROM, backed by MCU flash (soon to be deprecated)
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          OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_LEGACY_EMULATED_FLASH
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          COMMON_VPATH += $(PLATFORM_PATH)/$(PLATFORM_KEY)/$(DRIVER_DIR)/flash
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          COMMON_VPATH += $(DRIVER_PATH)/flash
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          SRC += eeprom_driver.c eeprom_legacy_emulated_flash.c legacy_flash_ops.c
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        else ifneq ($(filter $(MCU_SERIES),STM32F1xx STM32F3xx STM32F4xx STM32L4xx STM32G4xx WB32F3G71xx WB32FQ95xx AT32F415 GD32VF103),)
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          # Wear-leveling EEPROM implementation, backed by MCU flash
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          OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_WEAR_LEVELING
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          SRC += eeprom_driver.c eeprom_wear_leveling.c
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          WEAR_LEVELING_DRIVER ?= embedded_flash
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        else ifneq ($(filter $(MCU_SERIES),STM32L0xx STM32L1xx),)
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          # True EEPROM on STM32L0xx, L1xx
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          OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_STM32_L0_L1
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          SRC += eeprom_driver.c eeprom_stm32_L0_L1.c
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        else ifneq ($(filter $(MCU_SERIES),RP2040),)
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          # Wear-leveling EEPROM implementation, backed by RP2040 flash
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          OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_WEAR_LEVELING
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          SRC += eeprom_driver.c eeprom_wear_leveling.c
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          WEAR_LEVELING_DRIVER ?= rp2040_flash
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        else ifneq ($(filter $(MCU_SERIES),KL2x K20x),)
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          # Teensy EEPROM implementations
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          OPT_DEFS += -DEEPROM_KINETIS_FLEXRAM
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          SRC += eeprom_kinetis_flexram.c
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        else
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          # Fall back to transient, i.e. non-persistent
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          OPT_DEFS += -DEEPROM_DRIVER -DEEPROM_TRANSIENT
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          SRC += eeprom_driver.c eeprom_transient.c
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        endif
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      else ifeq ($(PLATFORM),TEST)
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        # Test harness "EEPROM"
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        OPT_DEFS += -DEEPROM_TEST_HARNESS
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        SRC += eeprom.c
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      endif
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    else ifeq ($(PLATFORM),TEST)
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      # Test harness "EEPROM"
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      OPT_DEFS += -DEEPROM_TEST_HARNESS
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      SRC += eeprom.c
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    endif
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  endif
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endif
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