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eeprom_stub - CDX replacement stub to allow interacting with EEPROM over UART #27

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eeprom_stub - CDX replacement stub to allow interacting with EEPROM over UART #27

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dfeb24d
eeprom_stub - CDX replacement stub to allow interacting with EEPROM o…
m-kozlowski Mar 2, 2026
19e64ee
eeprom_stub: fix SPI tSHSL violation causing silent write failures
m-kozlowski Mar 12, 2026
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32 changes: 32 additions & 0 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -100,5 +100,37 @@ $(BUILD)/%.elf: | $(BUILD)
$(BUILD)/%.bin: $(BUILD)/%.elf
$(OBJCOPY) -Obinary $< $@


# eeprom_stub - standalone CDX replacement for s10 platform
#
# Build: make eeprom_stub
# Output: build/eeprom_stub_nocrc.bin (raw, for patched bootloader)
# build/eeprom_stub_full.bin (768KB + CRC, for stock bootloader)

EEPROM_STUB_OFFSET ?= 0x08040000

EEPROM_STUB_OBJS := $(patsubst $(SRC)/%.c,$(BUILD)/%.o,$(wildcard $(SRC)/eeprom_stub*.c))

# The stub uses its own linker script
$(BUILD)/eeprom_stub.elf: $(EEPROM_STUB_OBJS) | $(BUILD)
$(LD) --nostdlib \
-T $(SRC)/eeprom_stub.ld \
--defsym=STUB_FLASH_ORIGIN=$(EEPROM_STUB_OFFSET) \
-o $@ $(EEPROM_STUB_OBJS)

$(BUILD)/eeprom_stub_nocrc.bin: $(BUILD)/eeprom_stub.elf
$(OBJCOPY) -Obinary $< $@

eeprom_stub: $(BUILD)/eeprom_stub_nocrc.bin $(BUILD)/eeprom_stub_full.bin
@echo "EEPROM stub built:"
@echo " $(BUILD)/eeprom_stub_nocrc.bin (raw, for patched bootloader)"
@echo " $(BUILD)/eeprom_stub_full.bin (768KB + CRC, for stock bootloader)"
@$(CROSS)size $(BUILD)/eeprom_stub.elf

# Full CDX image: pad to region size, fix CRC16 for bootloader validation
$(BUILD)/eeprom_stub_full.bin: $(BUILD)/eeprom_stub_nocrc.bin
@python3 python/fix_crc.py $< -o $@ --pad 0xC0000


clean:
$(RM) $(BUILD)/*
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