Messages in this thread | | | Subject | Re: CRC errors between mvneta and macb | From | Richard Genoud <> | Date | Tue, 23 Oct 2018 08:58:10 +0200 |
| |
Le 22/10/2018 à 20:19, Andrew Lunn a écrit : >> 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? > 88E1512-NNP2
>> 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 > > Andrew >
Thanks, I'll look into that.
Richard
| |