我的NIOS的建立和NIOS/IDE中的存储器的设置与Atlera的文档介绍的一样，在Build all的时候也能通过，但是就是不能在ISS中仿真调试，说是不能装载，怎么回事？程序如下

#include <stdio.h>      

#include <unistd.h>                     
#include <string.h>    
#include "system.h"                     
#include "altera_avalon_timer.h"
#include "altera_avalon_timer_regs.h"
#include "alt_types.h"                  
#include "sys/alt_irq.h"                

alt_u8 led=0;
alt_u16 cnter=0;
alt_u8 timer1_ok=0;
static void timer1_init()
{
  IOWR(SYS_CLK_TIMER_BASE,0,0);
  IOWR(SYS_CLK_TIMER_BASE,ALTERA_AVALON_TIMER_CONTROL_REG,0x0B);//continual count
  IOWR(SYS_CLK_TIMER_BASE, ALTERA_AVALON_TIMER_PERIODL_REG, 0x93E0);
  IOWR(SYS_CLK_TIMER_BASE, 3, 0x04);
  IOWR(SYS_CLK_TIMER_BASE, 1, ALTERA_AVALON_TIMER_CONTROL_CONT_MSK); 
}

void timer1_isr(int context)
{
  IOWR(SYS_CLK_TIMER_BASE, 0, ALTERA_AVALON_TIMER_STATUS_TO_OFST);
  IOWR(SYS_CLK_TIMER_BASE, ALTERA_AVALON_TIMER_PERIODL_REG, 0x93E0);
  IOWR(SYS_CLK_TIMER_BASE, 3, 0x04);
  timer1_ok=1;
}
void main()
{
  int context=0;
  alt_irq_register(SYS_CLK_TIMER_IRQ,SYS_CLK_TIMER_BASE,timer1_isr);
  timer1_init();
  while(1)
  {
    if(timer1_ok)
    {
      timer1_ok=0;
      cnter++;
      if(cnter==20)
      {
        cnter=0;
        led^=0xFF;
        IOWR(LED_PIO_BASE, 0, led);
      }
    }
  }
}

Build的结果如下：../resource.c:55: warning: passing arg 2 of `alt_irq_register' makes pointer from integer without a cast
../resource.c:55: warning: passing arg 3 of `alt_irq_register' from incompatible pointer type
../resource.c:54: warning: unused variable `context'
../resource.c:77:51: warning: no newline at end of file
Info: (test.elf) 33 KBytes program size (code + initialized data).
Info:            16350 KBytes free for stack + heap.
Post-processing to create ext_flash.flash
Hardware simulation is not enabled for the target SOPC Builder system. Skipping creation of hardware simulation model contents and simulation symbol files. (Note: This does not affect the instruction set simulator.)
Build completed