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Date:   Mon, 22 Oct 2018 20:19:18 +0200
From:   Andrew Lunn <>
To:     Richard Genoud <>
Cc:     Willy Tarreau <>,,
        Thomas Petazzoni <>,
        Antoine Tenart <>,
        Gregory CLEMENT <>,
        Yelena Krivosheev <>,
        Maxime Chevallier <>,
        Nicolas Ferre <>,
Subject: Re: CRC errors between mvneta and macb

> I dug more on the subject, and I think I found what Marvell's PHY/MAC
> doesn't like.

Hi Richard

What PHY is being used?

> After analyzing the ethernet frame on the Davicom PHY's output (pin
> TX+), I find out that the FCS errors occurs when the ethernet preamble
> is longer than 56bits. (something like 58 or 60 bits)

Some Marvell PHYs have a register bit which might be of interest: Page
2, register 16, bit 6.

0 = Pad odd nibble preambles in copper receive packets.
1 = Pass as is and do not pad odd nibble preambles in


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