回复: 回复: [PATCH v1 3/3] net: fsl_enetc: Add SGMII support for i.MX95

[Alice Guo (OSS)]

> -----邮件原件-----
> 发件人: Marek Vasut <marex at nabladev.com>
> 发送时间: 2026年6月8日 20:47
> 收件人: Alice Guo (OSS) <alice.guo at oss.nxp.com>; u-boot at lists.denx.de
> 抄送: Jerome Forissier <jerome.forissier at arm.com>; Tom Rini
> <trini at konsulko.com>; Ye Li <ye.li at nxp.com>; Alice Guo <alice.guo at nxp.com>;
> Clark Wang <xiaoning.wang at nxp.com>
> 主题: Re: 回复: [PATCH v1 3/3] net: fsl_enetc: Add SGMII support for i.MX95
> 
> On 6/8/26 8:58 AM, Alice Guo (OSS) wrote:
> 
> Hello Alice,
> 
> >>> Add SGMII interface mode configuration for i.MX95 platform in ENETC
> >>> driver.
> >> Which PHY did you use for the tests here ?
> >>
> >> Have you also tested this with a 100/Full only (not 1000/Full)
> >> capable switch -- does this work in 100/Full node or does this work only in
> 1000/Full mode ?
> >
> > Hi Marek,
> >
> > I tested this using the Aquantia AQR113C PHY. The interface works correctly in
> 1000/full mode, but it does not support 100/full mode.
> Do you know why is the 100/Full operation not supported ?
> 
> I also noticed the same in Linux, and also with DP83867.
> 
> I would expect the SGMII to duplicate traffic on the SGMII bus 10x/100x in
> 100/Full and 10/Full modes, is this not the case with MX95 and SGMII 1G ?
> 
> Thank you for your help !

This is a hardware limitation of the i.MX95 NETC implementation. The SGMII protocol is controlled by the internal XPCS, which does not support 100 Mbps or 10 Mbps operation through symbol replication (10x/100x duplication) on the SGMII bus.

Best regards,
Alice Guo