🐛 Fix JG Aurora A1 implementation (#27622)

Author: itiserik

Marlin/src/pins/stm32f1/pins_JGAURORA_A5S_A1.h

@@ -49,7 +49,7 @@
 // Enable EEPROM Emulation for this board, so that we don't overwrite factory data
 #if NO_EEPROM_SELECTED
   //#define I2C_EEPROM                            // AT24C64
-  //#define FLASH_EEPROM_EMULATION
+  #define FLASH_EEPROM_EMULATION
 #endif
 
 #if ENABLED(I2C_EEPROM)

buildroot/share/PlatformIO/variants/MARLIN_F103Zx/start.S

@@ -0,0 +1,104 @@
+/**
+  *************** (C) COPYRIGHT 2017 STMicroelectronics ************************
+  * @file      startup_stm32f101xe.s
+  * @author    MCD Application Team
+  * @brief     STM32F101xE Value Line Devices vector table for Atollic toolchain.
+  *            This module performs:
+  *                - Set the initial SP
+  *                - Set the initial PC == Reset_Handler,
+  *                - Set the vector table entries with the exceptions ISR address
+  *                - Configure the clock system
+  *                - Branches to main in the C library (which eventually
+  *                  calls main()).
+  *            After Reset the Cortex-M3 processor is in Thread mode,
+  *            priority is Privileged, and the Stack is set to Main.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+  .syntax unified
+  .cpu cortex-m3
+  .fpu softvfp
+  .thumb
+
+.global g_pfnVectors
+.global Default_Handler
+
+/* start address for the initialization values of the .data section.
+defined in linker script */
+.word _sidata
+/* start address for the .data section. defined in linker script */
+.word _sdata
+/* end address for the .data section. defined in linker script */
+.word _edata
+/* start address for the .bss section. defined in linker script */
+.word _sbss
+/* end address for the .bss section. defined in linker script */
+.word _ebss
+
+.equ  BootRAM,        0xF1E0F85F
+/**
+ * @brief  This is the code that gets called when the processor first
+ *          starts execution following a reset event. Only the absolutely
+ *          necessary set is performed, after which the application
+ *          supplied main() routine is called.
+ * @param  None
+ * @retval : None
+*/
+
+  .section .text.Reset_Handler
+  .weak Reset_Handler
+  .type Reset_Handler, %function
+Reset_Handler:
+
+  /* Disable SysTick interrupt (was enabled by jg aurora bootloader) */
+  ldr r2,SysTick
+  movs r1, #0
+  str r1, [r2]
+  /* Copy the data segment initializers from flash to SRAM */
+  b LoopCopyDataInit
+SysTick:
+  .word 0xE000E010
+CopyDataInit:
+  ldr r3, =_sidata
+  ldr r3, [r3, r1]
+  str r3, [r0, r1]
+  adds r1, r1, #4
+
+LoopCopyDataInit:
+  ldr r0, =_sdata
+  ldr r3, =_edata
+  adds r2, r0, r1
+  cmp r2, r3
+  bcc CopyDataInit
+  ldr r2, =_sbss
+  b LoopFillZerobss
+/* Zero fill the bss segment. */
+FillZerobss:
+  movs r3, #0
+  str r3, [r2], #4
+
+LoopFillZerobss:
+  ldr r3, = _ebss
+  cmp r2, r3
+  bcc FillZerobss
+
+/* Call the clock system intitialization function.*/
+    bl  SystemInit
+/* Call static constructors */
+    bl __libc_init_array
+/* Call the application's entry point.*/
+  bl main
+  bx lr
+
+.size Reset_Handler, .-Reset_Handler

ini/stm32f1.ini

@@ -364,6 +364,8 @@ board_build.offset          = 0xA000
 board_upload.offset_address = 0x0800A000
 build_flags                 = ${stm32_variant.build_flags}
                               -DSTM32F1xx -DSTM32_XL_DENSITY
+build_unflags               = ${stm32_variant.build_unflags}
+                              -DUSBCON -DUSBD_USE_CDC
 extra_scripts               = ${stm32_variant.extra_scripts}
                               buildroot/share/PlatformIO/scripts/jgaurora_a5s_a1_with_bootloader.py