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DP83867IR: PHY connection problems in 1GBps, even in 100Mbps. Not able to set Internal Delay (overwritted by the Linux driver)

Pascal Seguin
Prodigy 10 points
Part Number: DP83867IR

Hi

I got some problems regarding the TI PHY connection.  

My design turn around the reference design KV260 (using Kria from Xilinx)  The original design used the TI PHY pn:  DP83867CRRGZR that contains only RGMII connection.

Instead of this PHY, we use the DP83867IPPAP that contains SGMII, MII and RGMII connections possibility.

The electrical connection from the PHY the the Kria module are exactly the same on the KV260 Carrier board.

Actually, with the DP83867 linux driver, we are not able to connect to the PHY at 1Gbps, it automatically downgrade to 100Mbps.  At 100Mbps, small ping can be transmit and received, but with larger ping, 50% of the packets is lost.

We actually using this driver:

https://github.com/torvalds/linux/blob/master/drivers/net/phy/dp83867.c

Is there anyone else with this problem ?

Regards

Pascal