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am335x RGMII ping包大于300字节不通问题



问题:

am335x通过MII接到mv88e6097交换芯片,配置好交换芯片包直接通到MII,ping包没问题;

但是将MII换成RGMII,更改了am335x的MII模式变成RGMII之后与交换芯片连接,ping大于300字节的包就会不通,交换芯片直接没有收到CPU发来的包,这个是什么原因呢?am335x这端做了限制么?