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        Sat, 29 Jun 2019 11:38:39 -0700 (PDT)
Date: Sat, 29 Jun 2019 20:38:37 +0200
From: "Nicklas SB Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: [geda-user] Ethernet PHY KSZ8081 auto negotiation link up problem
Message-Id: <20190629203837.ec779cc02f9ac3f1da0cc593@gmail.com>
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Reply-To: geda-user AT delorie DOT com

I have an Ethercat card there I choosed KSZ8081 as PHY, driver for Ethernet, datasheet where registers where not available for chip used in reference design BCM4251XA1KMLG and KSZ8081 is common so I expected it work.

Auto negotiation works with other devices ordinary computer, switch, other ethercat card but not other cards with the same PHY KSZ8081. I could actually put ethercat cards with KSZ8081 closest to computer another ethercat card in between an ethercat card with KSZ8081 at the then and work counter say it is communication in between all three cards in the chain. Problem is bound to auto negotiation and there should be no other communication before link up so I expect same problem will if it used for ordinary ethernet.

Registers suggest auto negotiation work, ack is sent but link up never occur. Do anybody have any idea?


Regards Nicklas Karlsson