FLASH_EEPROM => FLASH_EEPROM_EMULATION

Marlin/src/HAL/HAL_LPC1768/persistent_store_api.h

  */
 #include "../shared/persistent_store_api.h"
 
-#define FLASH_EEPROM
+#define FLASH_EEPROM_EMULATION

Marlin/src/HAL/HAL_LPC1768/persistent_store_flash.cpp

 #include "persistent_store_api.h"
 #include "../../inc/MarlinConfig.h"
 
-#if ENABLED(FLASH_EEPROM)
+#if ENABLED(FLASH_EEPROM_EMULATION)
 
 extern "C" {
   #include "lpc17xx_iap.h"
 #define EEPROM_SIZE (4096)
 #define SECTOR_SIZE (32768)
 #define EEPROM_SLOTS (SECTOR_SIZE/EEPROM_SIZE)
-#define EEPROM_ERASE (0xff)
+#define EEPROM_ERASE (0xFF)
 #define SLOT_ADDRESS(sector, slot) (((uint8_t *)SECTOR_START(sector)) + slot * EEPROM_SIZE)
 
 static uint8_t ram_eeprom[EEPROM_SIZE] __attribute__((aligned(4))) = {0};
 
 size_t PersistentStore::capacity() { return EEPROM_SIZE; }
 
-#endif // FLASH_EEPROM
+#endif // FLASH_EEPROM_EMULATION
 #endif // EEPROM_SETTINGS
 #endif // TARGET_LPC1768

Marlin/src/HAL/HAL_LPC1768/persistent_store_sdcard.cpp

 #include "../../inc/MarlinConfig.h"
 #include "persistent_store_api.h"
 
-#if DISABLED(FLASH_EEPROM)
+#if DISABLED(FLASH_EEPROM_EMULATION)
 
 #include <chanfs/diskio.h>
 #include <chanfs/ff.h>
 
 size_t PersistentStore::capacity() { return 4096; } // 4KiB of Emulated EEPROM
 
-#endif // !FLASH_EEPROM
+#endif // !FLASH_EEPROM_EMULATION
 #endif // EEPROM_SETTINGS
 #endif // TARGET_LPC1768