Hi AMD,
I used AMD R1606G and SGMII(GPP4) connect a Broadcom PHY, 54210s. And execute amd-xgbe diriver. I can detect the PHY and the RJ45 LED light one LED, I think 100M is link up. However, after I typed "ifconfig eth0 up" or assign IP, the RJ45 LED go out and traffic not work. Sometimes I reset the phy by register, the link can re-connect to link partner. Have you meet this issue? Thanks.