Robin E3D Flash-based EEPROM (#18219)

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3.h

@@ -41,6 +41,17 @@
 #define ENABLE_SPI2
 
 //
+// EEPROM
+//
+#if EITHER(NO_EEPROM_SELECTED, FLASH_EEPROM_EMULATION)
+  #define FLASH_EEPROM_EMULATION
+  #define EEPROM_PAGE_SIZE     (0x800U) // 2KB
+  #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
+  #undef E2END
+  #define E2END                (EEPROM_PAGE_SIZE - 1) // 2KB
+#endif
+
+//
 // Servos
 //
 #define SERVO0_PIN                          PA3

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3D.h

@@ -41,6 +41,17 @@
 #define ENABLE_SPI2
 
 //
+// EEPROM
+//
+#if EITHER(NO_EEPROM_SELECTED, FLASH_EEPROM_EMULATION)
+  #define FLASH_EEPROM_EMULATION
+  #define EEPROM_PAGE_SIZE     (0x800U) // 2KB
+  #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
+  #undef E2END
+  #define E2END                (EEPROM_PAGE_SIZE - 1) // 2KB
+#endif
+
+//
 // Servos
 //
 #define SERVO0_PIN                          PA3

buildroot/share/PlatformIO/ldscripts/mks_robin_e3.ld

@@ -1,7 +1,7 @@
 MEMORY
 {
   ram (rwx) : ORIGIN = 0x20000000, LENGTH = 48K - 40
-  rom (rx)  : ORIGIN = 0x08005000, LENGTH = 256K - 20K
+  rom (rx)  : ORIGIN = 0x08005000, LENGTH = 256K - 20K - 4K
 }
 
 /* Provide memory region aliases for common.inc */