make sure your network cable and router support 1000M?
if they are correct ,the log will be like this:
[ 453.385496] stmmc_pltfr_fix_mac_speed: fix speed to 1000
[ 453.385735] stmmc_pltfr_fix_mac_speed: fix speed for RGMII
[ 453.385844] libphy: stmmac-0:01 - Link is Up - 1000/Full
