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Zhao Ming,
请问你的板子上有烧写uboot/linux么?如果有,请确保在uboot停下,再连接仿真器。
另,请问你是否使用的是XDS560的仿真器,如果是,可以尝试降低jtag的速度。
Zhao Ming,
连上板子的串口,上电后看看是否有打印输出,如果有uboot输出,串口里敲任何键都能让uboot停下来。