Re: CRC errors between mvneta and macb

[Richard Genoud]

Le 22/10/2018 Ã 20:19, Andrew Lunn a ÃcritÂ:
>> 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