Not an error, looks like it is just a checksum that is stored with the data for testing.


configuration_store.cpp

// Report storage size
#if ENABLED(EEPROM_CHITCHAT)
SERIAL_ECHO_START();
SERIAL_ECHOPAIR("Settings Stored (", eeprom_size - (EEPROM_OFFSET));
SERIAL_ECHOPAIR(" bytes; crc ", (uint32_t)final_crc);
SERIAL_ECHOLNPGM(")");
#endif
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#define DUMMY_PID_VALUE 3000.0f
#define EEPROM_START() int eeprom_index = EEPROM_OFFSET
#define EEPROM_SKIP(VAR) eeprom_index += sizeof(VAR)
#define EEPROM_WRITE(VAR) write_data(eeprom_index, (uint8_t*)&VAR, sizeof(VAR), &working_crc)
#define EEPROM_READ(VAR) read_data(eeprom_index, (uint8_t*)&VAR, sizeof(VAR), &working_crc)
#define EEPROM_ASSERT(TST,ERR) if (!(TST)) do{ SERIAL_ERROR_START(); SERIAL_ERRORLNPGM(ERR); eeprom_read_error = true; }while(0)
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const uint16_t final_crc = working_crc;
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EEPROM_READ(stored_crc);