> >> I am currently upstreaming the "Nitrogen 8m Mini board" that seems to not use a > >> "normal" mdio bus but a "bitbanged" one with the fsl fec driver. > > > > Any idea why? > > > > Anyway, you should not replicate code, don't copy bitbanging code into > > the FEC. Just use the existing bit-banger MDIO bus master driver. > > Right there should be no need for you to modify the FEC driver at all, > there is an existing generic bitbanged MDIO bus driver here: Hi Florian Speculation on my part, until i hear back on the Why? question, but i'm guessing the board has a wrong pullup on the MDIO line. It takes too long for the PHY/FEC to pull the line low at the default 2.5MHz. bit-banging is much slower, so it works. If i'm right, there is a much simpler fix for this. Use the clock-frequency property for the MDIO bus to slow the clock down. Andrew
