how to do loopback testing

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how to do loopback testing

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allan_yi
Contributor I

Hello

I Use LS1043+QCA8337 wiht SGMII ,but it can not Ping.so  I want  to test the bus of serdes,but I can not do the loopback test abou  serders Of lanA ,because the register can not write.could you give me some advices,thanks a lot!

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