关于STM8L151G6串口升级的问题求解

目前需要做STM8L151G6的串口升级，flash工32K，boot分2K，应用程序（run_APP）占15K，升级程序(isp_APP)15K。正常情况下运行run_APP，与升级命令时通过串口接收数据并存放于isp_APP区域，接收成功后复位到boot，它将isp_APP的数据搬到run_APP中并运行。之前做过STM32和430的程序，总以为差不多，不过调试了两周多了，总是找不到问题。使用了IAR 1.41.1.boot的icf文件：
    define memory with size = 16M;
    define region tinyData = [from 0x00 to 0xFF];
    define region NearData = [from 0x0000 to 0x07FF];
    define region Eeprom = [from 0x1000 to 0x13FF];
    define region BootROM = [from 0x6000 to 0x67FF];
    define region NearFuncCode = [from 0x8000 to 0x87FF];
    define region FarFuncCode = [from 0x8000 to 0x87FF];
    define region HugeFuncCode = [from 0x8000 to 0x87FF];
run_APP的icf文件：
    define memory with size = 16M;
    define region TinyData = [from 0x00 to 0xFF];
    define region NearData = [from 0x0000 to 0x07FF];
    define region Eeprom = [from 0x1000 to 0x13FF];
    define region BootROM = [from 0x6000 to 0x67FF];
    define region NearFuncCode = [from 0x8800 to 0xC3FF];
    define region FarFuncCode = [from 0x8800 to 0xC3FF];
    define region HugeFuncCode = [from 0x8800 to 0xC3FF];


boot的main文件：
__root const long reintvec[]@".intvec"=
{      
    0x82008080,0x82008804,0x82008808,0x8200880C, //当应用程序地址不是0xB000时则要相应改掉除第一个
    0x82008810,0x82008814,0x82008818,0x8200881C, //0x82008080以外的数值
    0x82008820,0x82008824,0x82008828,0x8200882C,
    0x82008830,0x82008834,0x82008838,0x8200883C,
    0x82008840,0x82008844,0x82008848,0x8200884C,
    0x82008850,0x82008854,0x82008858,0x8200885C,
    0x82008860,0x82008864,0x82008868,0x8200886C,
    0x82008870,0x82008874,0x82008878,0x8200887C,
};

void main(void)
{
    u8 i;
    Main_Init();
    EEPROM_Read(IAPFlagAddr, StartIAPFlag,1);
    if(StartIAPFlag==0x01)       //如果存在升级标志                                    
    {
       //清空APP区的数据
        FLASH_Unlock(FLASH_MemType_Program);
        for(i=0;i