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SubjectRe: [PATCH 1/8] net: phy: realtek: rtl8221: allow to configure SERDES mode
> +#define RTL8221B_SERDES_OPTION_MODE_2500BASEX_SGMII	0
> +#define RTL8221B_SERDES_OPTION_MODE_HISGMII_SGMII 1
> +#define RTL8221B_SERDES_OPTION_MODE_2500BASEX 2

So what is 2500BASEX_SGMII? You cannot run SGMII at 2.5G, because
there is no way to repeat a symbol 2.5 times so that a 1G stream takes
up 2.5G bandwidth. The SGMII signalling also does not work at 2.5G.

Please add an explanation what this actually is.

Andrew

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