各位:

我在NiosII SDK Shell里执行 nr mytimer.srec时出现了以下情况

[SOPC Builder]$ nr mytimer.srec

nios-run: Ready to download mytimer.srec over COM1: at 115200 bps
        : Press CPU Reset (or CLEAR) on target board to begin download
        : Type Control-C to exit the program
        : Waiting for target....................................................
................................................................................
................................................................................
.....................................................

之前我执行 nr -t -r 时,出现

[SOPC Builder]$ nr -t -r

nios-run: Entering terminal mode over COM1: at 115200 bps

nios-run: Terminal mode (Control-C exits)
-----------------------------------------

不知道哪里出了问题,望大家指点,先谢了