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This patch series adds support for configuring RGMII internal
delays for the Aspeed AST2600 FTGMAC100 Ethernet MACs.

So i think you are doing things in the wrong order. You first need
to sort out the mess of most, if not all, AST2600 have the wrong
phy-mode, because the RGMII delay configuration is hidden, and set

wrongly.

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Please fix that first.

The RGMII delay is configured in U-boot stage, and it is not changed
when booting to Linux. I want to know whether the first thing to
correct here is whether the phy-mode in aspeed-ast2600-evb.dts is
rgmii-id. Our AST2600 EVB, there is no delay on board, so, I need to change
the phy-mode to "rgmii-id" to meet the RGMII usage first?

If there is no delay on the PCB, then phy-mode is "rgmii-id".

I will submit a single patch to correct the phy-mode to "rgmii-id" in our EVB dts,
aspeed-ast2600-evb.dts.

Thanks,
Jacky