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DM816X/AM389X EVM启动后U-BOOT



TI的DM816X/AM389X开发板,SD卡启动后进入U-BOOT命令行模式,通过setenv ipaddr设置IP地址,ubuntu主机端设置好同一网段IP,从开发板PING主机,打印信息using davinci emac device,host 192.168.0.160 is alive。主机端PING开发板PING不通,但是可以通过TFTP下载程序到开发板。用同一根网线连接ubuntu主机和另一台winxp主机,可以PING通,请问可能是什么原因,谢谢