We have done some testing with 2.5G devices recently.
Unfortunately we have determined that current Ten64 production boards are unable to use 2.5G SFP’s.
The cause is the 10G retimer (DS110DF410) not supporting 2.5G rates.
However, an alternative part exists that can support 1G, 2.5G and 10G which we might build with in the future.
Futhermore, there appear to be interoperability issues between the “SGMII 2.5” in the LS1088 and the 2500BASE-X in many of these SFPs. I haven’t been able to get the FS 2500BASE-T working yet (on a board with the 10G retimer bypassed), it might be due to conflicting settings between them.
If anyone is interested in testing Ten64 boards with 2.5G SFP support, let us know.