原创 NIOS 2无法跑起来

最近跟着黑金开发板的风,学习NIOS 2.自己画了一块板子,包括SDRAM,FLASH,SPI,UART,灯,按键等,前一阵没上SDRAM,一直正常,但是今天加了SDRAM后,在DEBUG时,出现下列提示:

Using cable "USB-Blaster [USB-0]", device 1, instance 0x00
Pausing target processor: OK
Initializing CPU cache (if present)
OK

Downloading 04000020 ( 0%)
Downloaded 19KB in 0.3s (63.3KB/s)

Verifying 04000020 ( 0%)
Verify failed between address 0x4000020 and 0x4004BAF
Leaving target processor paused

系统就跑不动,应该SDRAM的问题,SDRAM的地址为0x4000000?

有谁遇到过类似的问题?