DP83867IR: PHY unable to establish 1GE connection in U-boot to link partner but works every time from Linux

Mateusz Stanislawski

Part Number: DP83867IR

we seem to have an issue in a system, where with the same hardware we boot into Linux running on a Zynq Ultrascale + we get a 1 GE link between the PHY and the link partner, but on the same hardware when we try to bring up the PHY from u-boot, the PHY attempts to link up to 1 GE, fails then tries 100M fails and eventually lands on 10M link speed.

Any thoughts on what could be causing the PHY to work in one scenario and fail in the other when negotiating to its link partner?

MDIO interface is functional in both scenarios, strapping pins have been verified through the MDIO interface to match hardware. when link does come up at 1 GE it can run error free for days.

SNLA246A was helpful, but not being an expert on Ethernet negotiation, i am looking for some hints here.

regards

Mateusz

over 3 years ago

0 Mateusz Stanislawski over 3 years ago

Prodigy 20 points

just to add a bit more detail, on the connectivity, the design is using GMII interface from PHY to the PL of the Zynq, where it communicates with the MAC.

0 Gerome Cacho over 3 years ago in reply to Mateusz Stanislawski

TI__Mastermind 39785 points

Hello Mateusz,

Could you please check the difference in registers between the setups and provide them here? Please provide 0x0 through 0x1F as well as 0x6E and 0x6F.

Sincerely,

Gerome

Interface

Interface forum

DP83867IR: PHY unable to establish 1GE connection in U-boot to link partner but works every time from Linux