Re: Aquantia PHY in OCSGMII mode?

Alexander Wilhelm
2025-08-27T09:04:18Z

Am Wed, Aug 27, 2025 at 09:47:49AM +0100 schrieb Russell King (Oracle):
> On Wed, Aug 27, 2025 at 10:41:11AM +0200, Alexander Wilhelm wrote:
> > Set to 100M:
> >
> > fsl_dpaa_mac: [DEBUG] <memac_link_down> called
> > fsl_dpaa_mac: [DEBUG] <memac_link_up> called
> > fsl_dpaa_mac: [DEBUG] * mode: 0
> > fsl_dpaa_mac: [DEBUG] * phy_mode(interface): 2500base-x
> > fsl_dpaa_mac: [DEBUG] * memac_if_mode: 00000002 (IF_MODE_GMII)
> > fsl_dpaa_mac: [DEBUG] * speed: 2500
> > fsl_dpaa_mac: [DEBUG] * duplex: 1
> > fsl_dpaa_mac: [DEBUG] * tx_pause: 1
> > fsl_dpaa_mac: [DEBUG] * rx_pause: 1
>
> So the PHY reported that it's using 2500base-X ("OCSGMII") for 100M,
> which means 0x31b 3 LSBs are 4. Your hardware engineer appears to be
> incorrect in his statement.

I asked the hardware engineer again. The point is that the MAC does not set
SGMII for 100M. It still uses 2500base-x but with 10x paket repetition. He could
measure and proof that with a logic analyzer.

Best regards
Alexander Wilhelm