Hi Rene,

On Thu, Aug 22, 2019 at 07:50:33PM +0000, René van Dorst wrote:

Quoting Russell King - ARM Linux admin [off-list ref]:

quoted

Isn't this set for Cisco SGMII as well as for 802.3 1000BASE-X and
the up-clocked 2500BASE-X modes?

If so, is there a reason why 10Mbps and 100Mbps speeds aren't
supported on Cisco SGMII links?

I can only tell a bit about the mt7622 SOC, datasheet tells me that:

The SGMII is the interface between 10/100/1000/2500 Mbps PHY and Ethernet MAC,
the spec is raised by Cisco in 1999, which is aims for pin reduction compare
with the GMII. It uses 2 differential data pair for TX and RX with clock
embedded bit stream to convey frame data and port ability information.
The core leverages the 1000Base-X PCS and Auto-Negotiation from IEEE 802.3
specification (clause 36/37). This IP can support up to 3.125G baud for
2.5Gbps
(proprietary 2500Base-X) data rate of MAC by overclocking.

Also features tells me: Support 10/100/1000/2500 Mbps in full duplex mode and
10/100 Mbps in half duplex mode.

Yep, that is what I'd expect.  Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
According to speedtest.net: 11.9Mbps down 500kbps up