1、如果使用uCOS，那么Qsys中Nios II核就不能使用外部中断控制器（EIC）。

2、遇到很迷惑的问题，运行uCOSII的实例代码，总是在第二个OSTimeDlyHMSM(0, 0, 3, 0);出错。

单步调试后，发现代码在执行到NIOS2_WRITE_STATUS (status);汇编代码为ldw r2,-8(fp)时出错，暂停程序运行后，程序指向00000000：Call 0x0处。

void task1(void* pdata)

{

  while (1)

  {

    printf("Hello from task1\n");

    OSTimeDlyHMSM(0, 0, 3, 0);

  }

}

/* Prints "Hello World" and sleeps for three seconds */

void task2(void* pdata)

{

  while (1)

  {

    printf("Hello from task2\n");

    OSTimeDlyHMSM(0, 0, 3, 0);

  }

}

/* The main function creates two task and starts multi-tasking */

int main(void)

{

  OSTaskCreateExt(task1,

                  NULL,

                  (void *)&task1_stk[TASK_STACKSIZE-1],

                  TASK1_PRIORITY,

                  TASK1_PRIORITY,

                  task1_stk,

                  TASK_STACKSIZE,

                  NULL,

                  0);

  OSTaskCreateExt(task2,

                  NULL,

                  (void *)&task2_stk[TASK_STACKSIZE-1],

                  TASK2_PRIORITY,

                  TASK2_PRIORITY,

                  task2_stk,

                  TASK_STACKSIZE,

                  NULL,

                  0);

  OSStart();

  return 0;

}