我碰到过,现在解决了. Pre-Reading 8KBytes of data from U4:
|----.----+----.----|
********************* (1.031 sec).
Jan 6, 2008 4:59:19 PM - (??) nios2-flash-programmer: Success. Zero bytes writt
en to U4-
(because device matched contents of cfi_flash_0.flash) 应该是已经烧进去了,然后再次烧写时检测到里面的内容没变(because device matched contents of cfi_flash_0.flash),所以才 Zero bytes written | 
