Thor carrier board XFI PHY

[HW1234]

There are many questions about XFI external PHY in the forum, such as the following link, which seems to be inquiring whether the driver supports XFI external PHY

Jetson Thor MGBE XFI signals to support 100M/1G link speed

From the source code of the mgbe controller driver in drivers/net/ethernet/nvidia/nvethernet/ether_linux.c, it is understood that in the USXGMII 10G PHY interface mode, the PHY line side only supports link rates of 10G/5G/2.5G. The PHY in XFI mode we are using only supports link rates of 2.5G/5G, whereas in the USXGMII mode can support link rates of 100M/1G/2.5G/5G. How should this PHY be configured to enable the XFI data line to support 100M and 1G link rates? [usxgmii]