Orin nano internet speed down to 100M

I have followed design guidence to layout my customer board,but an error occurs in every booting:
“[ 164.608747] Generic FE-GE Realtek PHY r8169-8-100:00: Downshift occurred from negotiated speed 1Gbps to actual speed 100Mbps, check cabling!”

Is there something wrong with my settings?

Hi g_shilong,

Could you help to refer the following steps to load downstream driver(r8168) instead of upstream driver(r8169) and check if it could help?

$ sudo su
# cd /lib/modules/5.10.104-tegra/kernel/drivers/net/ethernet/realtek/
# mv r8169.ko r8169_temp.ko
# reboot

Please also share the dmesg after reboot for further check.

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