flash 下载出错，可验证，可擦写，编程出错，不知是哪出错了？

以前使用同一块板子，下载正常。

# Programming flash with the FPGA configuration
$SOPC_KIT_NIOS2/bin/nios2-flash-programmer --cable='ByteBlasterII [LPT1]' --devi
ce=1 --sidp=0x008020E0 --id=397118007 --timestamp=1166755453 --epcs --base=0x008
01800 cjq.flash
Using cable "ByteBlasterII [LPT1]", device 1, instance 0x00
Resetting and pausing target processor: OK
Reading System ID at address 0x008020E0: verified

              : Checksumming existing contents         

00000000      : Verifying existing contents            

00010000      : Verifying existing contents            

00010000      : Reading existing contents              

Checksummed/read 128kB in 12.8s                                       

00010000 ( 0%): Erasing                                

Erased 64kB in 0.0s                                   

00000000 ( 0%): Programming                            

00010000 ( 0%): Programming                            

Program failed                                        
Leaving target processor paused

# Creating .flash file for the project
$SOPC_KIT_NIOS2/bin/elf2flash --epcs --after=cjq.flash --input=hello_world_1.elf
 --output=epcs_controller.flash --boot=$SOPC_KIT_NIOS2/components/altera_nios2/b
oot_loader_epcs.srec

# Programming flash with the project
$SOPC_KIT_NIOS2/bin/nios2-flash-programmer --cable='ByteBlasterII [LPT1]' --devi
ce=1 --sidp=0x008020E0 --id=397118007 --timestamp=1166755453 --epcs --base=0x008
01800 epcs_controller.flash
Using cable "ByteBlasterII [LPT1]", device 1, instance 0x00
Resetting and pausing target processor: OK
Reading System ID at address 0x008020E0: verified

              : Checksumming existing contents         

00010000      : Verifying existing contents            

00010000      : Reading existing contents              

Checksummed/read 64kB in 10.4s                                       

00010000 ( 0%): Erasing                                

Erased 64kB in 0.0s                                   

00010000 ( 0%): Programming                            

Program failed                                        
Leaving target processor paused

正常提示：

Checksummed/read 102kB in 4.1s                                       
Erase not required

00000000 ( 0%): Programming                            

00010000 ( 0%): Programming                            

Programmed 102KB in 0.0s                                  
No change to device contents
Leaving target processor paused

。。。。。。。。。

Erased 64kB in 0.9s (71.1kB/s)                        

00010000 ( 0%): Programming                            

Programmed 3KB +61KB in 1.1s (58.1KB/s)                   
Did not attempt to verify device contents
Leaving target processor paused

可以，在as模式下下载，而且能够使用jtag调试。

当时用命令行形式时对epcs进行读操作时，只能够读出部分，不能100%读出。

而且感觉--read-byte参数不起作用，当该参数为0,0x100时，在读的过程中提示信息仍然按0x1000,0x2000,0x3000......增加，最后停止在某个百分比，提示："unable to read data from address 0xxxxxxx".

修改过了，现在已经没有了。但是状况还是一样。

以前在为处理timing部分的问题时曾经正常下载过。会不会有和系统有关系？

你用示波器看一下epcs上的信号质量好不好？

你以前用这块板子成功过吗，如果成功了，那肯定是你现在的工程有问题。

用示波器看到epcs上的时钟信号有波动，但幅度还够，低电平也足够低。