How to use the SFP+ ports at 1G?

[helloppc]

As per question, I am using the T4240RDB and, for compatibility, I would like to use the SFP+ ports at 1G instead of 10G.

Following the fman specs, I added the property fsl,fman-best-effort-port in the dtb, but my switch can't establish the connection (Dell 5324): I tried with auto-negotiation enabled and disabled.

Should I change anything else? Or am I misunderstanding the specs of FMAN?

[bpe]

Line data rate has nothing to do with any FMAN Device Tree properties because it is selected in another module, SerDes.

SerDes mode used for connecting to  SFP+ interfaces is XFI, which is a single data rate protocol. It will not autonegotiate

and switch to 1G. You have to perform  a full reset with another RCW to switch the SerDes lane to SGMII/1000Base-KX.

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Have a great day,
Platon