STM32H7 will modify the data at the internal flash 0x08080000 address when using LWIP

[cheney1]

I am using STM32H743 controller, LAN8720 Ethernet chip, and Keil5 programming software
I am using the IAP function of the network port and need to write the received data to FLASH. I found that the data read at that address after writing was modified. I found during debugging that after the "netif_add" function in LWIP initialization was executed, the data of my flash address was modified. May I ask what happened.
Here is my MPU configuration, I'm not sure if it's related to MPU configuration

uint8_t MPU_Set_Protection(uint32_t baseaddr, uint32_t size, uint32_t rnum, uint8_t ap, uint8_t sen, uint8_t cen, uint8_t ben)
{
    MPU_Region_InitTypeDef MPU_Initure;

    HAL_MPU_Disable(); // 配置MPU之前先关闭MPU,配置完成以后在使能MPU

    MPU_Initure.Enable = MPU_REGION_ENABLE;                  // 使能该保护区域
    MPU_Initure.Number = rnum;                               // 设置保护区域
    MPU_Initure.BaseAddress = baseaddr;                      // 设置基址
    MPU_Initure.Size = size;                                 // 设置保护区域大小
    MPU_Initure.SubRegionDisable = 0X00;                     // 禁止子区域
    MPU_Initure.TypeExtField = MPU_TEX_LEVEL0;               // 设置类型扩展域为level0
    MPU_Initure.AccessPermission = (uint8_t)ap;              // 设置访问权限,
    MPU_Initure.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE; // 允许指令访问(允许读取指令)
    MPU_Initure.IsShareable = sen;                           // 是否共用
    MPU_Initure.IsCacheable = cen;                           // 是否cache
    MPU_Initure.IsBufferable = ben;                          // 是否缓冲
    HAL_MPU_ConfigRegion(&MPU_Initure);                      // 配置MPU
    HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);                  // 开启MPU
    return 0;
}

// 设置需要保护的存储块
// 必须对部分存储区域进行MPU保护,否则可能导致程序运行异常
// 比如MCU屏不显示,摄像头采集数据出错等等问题...
void MPU_Memory_Protection(void)
{


    // 保护整个内部SRAM,包括SRAM1,SRAM2和DTCM,共512K字节
    MPU_Set_Protection(0x20000000,               /* 基地址 */
                       MPU_REGION_SIZE_512KB,    /* 长度 */
                       MPU_REGION_NUMBER0,       /* NUMER1 */
                       MPU_REGION_FULL_ACCESS,   /* 全访问 */
                       MPU_ACCESS_NOT_SHAREABLE, /* 允许共享 */
                       MPU_ACCESS_NOT_CACHEABLE, /* 允许cache */
                       MPU_ACCESS_BUFFERABLE);   /* 允许缓冲 */

    // 保护LAN8720的寄存器区域,共256字节
    MPU_Set_Protection(0X30040000,               /* 基地址 */
                       MPU_REGION_SIZE_256B,     /* 长度 */
                       MPU_REGION_NUMBER6,       /* NUMER3 */
                       MPU_REGION_FULL_ACCESS,   /* 全访问 */
                       MPU_ACCESS_NOT_SHAREABLE, /* 允许共享 */
                       MPU_ACCESS_NOT_CACHEABLE, /* 允许cache */
                       MPU_ACCESS_BUFFERABLE);   /* 允许缓冲 */

    // 保护整个NAND FLASH区域,共256M字节
    MPU_Set_Protection(0X80000000,               /* 基地址 */
                       MPU_REGION_SIZE_256MB,    /* 长度 */
                       MPU_REGION_NUMBER1,       /* NUMER2 */
                       MPU_REGION_FULL_ACCESS,   /* 全访问 */
                       MPU_ACCESS_NOT_SHAREABLE, /* 允许共享 */
                       MPU_ACCESS_NOT_CACHEABLE, /* 允许cache */
                       MPU_ACCESS_BUFFERABLE);   /* 允许缓冲 */

    // 保护SDRAM区域,共32M字节
    MPU_Set_Protection(0XC0000000,               /* 基地址 */
                       MPU_REGION_SIZE_32MB,     /* 长度 */
                       MPU_REGION_NUMBER2,       /* NUMER1 */
                       MPU_REGION_FULL_ACCESS,   /* 全访问 */
                       MPU_ACCESS_NOT_SHAREABLE, /* 允许共享 */
                       MPU_ACCESS_NOT_CACHEABLE, /* 允许cache */
                       MPU_ACCESS_BUFFERABLE);   /* 允许缓冲 */
}