the problem of compactflash test

[Altera_Forum]

yesterday£¬my group produced the slot between compactflash card and up3 board 

I first write a test code# include <stdio.h># include <stdlib.h># include <unistd.h>  # include "system.h"# include "sys/alt_alarm.h"# include "sys/alt_irq.h"# include "altera_avalon_cf_regs.h"# include "altera_avalon_cf.h"# include "ide.h"# define ctl_base (int*)CF_CTL_BASE# define ctl_irq (int)CF_CTL_IRQ# define ide_base (int*)CF_IDE_BASE# define ide_irq (int)CF_IDE_IRQ    int cardPresent(void);  int main() { unsigned short usStatus, usBuffer[256]; unsigned int i;  printf("cf card inert or not"); if( !cardPresent() )  {  printf("error: Compact Flash card not detected.\n");  return -1;  }  IOWR_ALTERA_AVALON_CF_IDE_COMMAND(ide_base, IdentifyDeviceCmd); usleep(1); usStatus = IORD_ALTERA_AVALON_CF_IDE_STATUS(ide_base); usStatus = IORD_ALTERA_AVALON_CF_IDE_ALTERNATE_STATUS(ide_base); if(usStatus & StatusRegBitDRQ)  {  for(i = 0; i < 256; ++i)  {  usBuffer = iord_altera_avalon_cf_ide_data(ide_base);  }  }  else  {  printf("error: drq not set in status reg\n");  return -1;  }  for(i=0;i<256;i++)  {  printf(¡°%04x\n",usbuffer);  }   }  int cardPresent(void) {  if( (IORD_ALTERA_AVALON_CF_CTL_STATUS(ctl_base) &   ALTERA_AVALON_CF_CTL_STATUS_PRESENT_MSK) )  {  printf("you have insert the cf card");  return 1;  }  else  {  return 0;  } }   the result is ¡±you have insert the cf card¡° ffffffff fffffff ¡£¡£¡£ ffffff why£¿     then i use the test code on our forum  it only show nios2-terminal: Warning: Unable to verify whether your download cable is nios2-terminal: supported for Nios II systems. If you use an unsupported cable nios2-terminal: you may experience intermittent JTAG communication failures. nios2-terminal: Please refer to the file errata.txt included in the Nios II nios2-terminal: development kit documents directory for information on how to nios2-terminal: update your system.  nios2-terminal: connected to hardware target using JTAG UART on cable nios2-terminal: "ByteBlasterII [LPT1]", device 1, instance 0 nios2-terminal: starting in terminal mode (Control-C exits)   the design of slot error£¿£¿£¿£¿£¿