Use E2END, if defined, for STM32F1 (SD) (#13981)

Marlin/src/HAL/HAL_STM32F1/persistent_store_sdcard.cpp

 /**
  * Marlin 3D Printer Firmware
- *
  * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- * Copyright (c) 2016 Bob Cousins bobcousins42@googlemail.com
- * Copyright (c) 2015-2016 Nico Tonnhofer wurstnase.reprap@gmail.com
- * Copyright (c) 2016 Victor Perez victor_pv@hotmail.com
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -33,12 +32,18 @@
 
 #include "../shared/persistent_store_api.h"
 
-#include "../../sd/cardreader.h"
+#ifndef E2END
+  #define E2END 4095
+#endif
+#define HAL_STM32F1_EEPROM_SIZE (E2END + 1)
 
-#define HAL_STM32F1_EEPROM_SIZE 4096
-char HAL_STM32F1_eeprom_content[HAL_STM32F1_EEPROM_SIZE];
+static char HAL_STM32F1_eeprom_content[HAL_STM32F1_EEPROM_SIZE];
 
-char eeprom_filename[] = "eeprom.dat";
+#if ENABLED(SDSUPPORT)
+
+  #include "../../sd/cardreader.h"
+
+  static const char eeprom_filename[] = "eeprom.dat";
 
   bool PersistentStore::access_start() {
     if (!card.isDetected()) return false;
@@ -61,6 +66,12 @@ bool PersistentStore::access_finish() {
     return (bytes_written == HAL_STM32F1_EEPROM_SIZE);
   }
 
+#else // !SDSUPPORT
+
+  #error "Please define SPI_EEPROM (in Configuration.h) or disable EEPROM_SETTINGS."
+
+#endif // !SDSUPPORT
+
 bool PersistentStore::write_data(int &pos, const uint8_t *value, const size_t size, uint16_t *crc) {
   for (size_t i = 0; i < size; i++)
     HAL_STM32F1_eeprom_content[pos + i] = value[i];