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TMDSLCDK138开发板启动后插网线无效

刚刚买了一个新的官方LCDK138开发板,设置拨码开关为SD/MMC启动方式,插上出厂自带的SD卡,

1.此时网线没插,上电正常启动,这时候我再插上网线没有一点反应,网络灯也不亮,

2.网线已插好,断电重启,网络灯亮了,启动完成之后,我PING 我的PC主机,正常能PING通;

3.能PING通之后,我拔了网线,过了30S再插上去,又是没反应,

我就想问一下启动之后,如何设置,才能随时插拔网线,随时连接网络,也就是能够PHY: davinci_mdio-0:07 - Link is Up - 100/Full???