关于dm368 RBL启动UBL的问题

你好，

     我调试时在UBL 的DEVICE_init()函数里加了看门狗复位操作让程序不断做重启，当启动失败出现时没有任何打印（RBL本身没有打印信息的，只有UBL在初始化串口后才能打印信息），我怀疑是在RBL启动UBL阶段出现了问题，即程序还没有进入UBL就已经失败了，DEVICE_init()函数修改如下（红色部分）：

Uint32 DEVICE_init()
{
  Uint32 status = E_PASS;
 
   // Mask all interrupts
  AINTC->INTCTL = 0x4;
  AINTC->EABASE = 0x0;
  AINTC->EINT0  = 0x0;
  AINTC->EINT1  = 0x0;  
  
  // Clear all interrupts
  AINTC->FIQ0 = 0xFFFFFFFF;
  AINTC->FIQ1 = 0xFFFFFFFF;
  AINTC->IRQ0 = 0xFFFFFFFF;
  AINTC->IRQ1 = 0xFFFFFFFF;

  POR_RESET();
  WDT_RESET();

#ifndef SKIP_LOW_LEVEL_INIT

   // System PSC setup - enable all
  DEVICE_PSCInit();
 
  DEVICE_pinmuxControl(0,0xFFFFFFFF,0x00FD0000);  // All Video Inputs
  DEVICE_pinmuxControl(1,0xFFFFFFFF,0x00145555);  // All Video Outputs
  DEVICE_pinmuxControl(2,0xFFFFFFFF,0x000000DA);  // EMIFA
  DEVICE_pinmuxControl(3,0xFFFFFFFF,0x00180000);  // SPI0, SPI1, UART1, I2C, SD0, SD1, McBSP0, CLKOUTs
  DEVICE_pinmuxControl(4,0xFFFFFFFF,0x55555555);  // MMC/SD0 instead of MS, SPI0

 GPIO->DIR02 &= 0xfeffffff;
 GPIO->CLRDATA02 = 0x01000000;

 
  if (status == E_PASS) status |= DEVICE_PLL1Init();

  if (status == E_PASS) status |= DEVICE_PLL2Init();

 if (status == E_PASS)
  status |= DEVICE_DDR2Init();

#endif
  // AEMIF Setup
  if (status == E_PASS) status |= DEVICE_EMIFInit();

  // UART0 Setup
  if (status == E_PASS) status |= DEVICE_UART0Init();

  // TIMER0 Setup
  if (status == E_PASS) status |= DEVICE_TIMER0Init();
 
  // I2C0 Setup
  if (status == E_PASS) status |= DEVICE_I2C0Init();

  WDT_FLAG_ON();

  DEBUG_printString("WDT_RESET---------------1\r\n");
 
  WDT_RESET();

  while(1)
  {
         DEBUG_printString(" wait WDT_RESET\r\n");
  }

  return status;
}