[U-Boot] Disabling Autonegotiation

[Christian Gmeiner]

Hi all

2015-06-09 21:50 GMT+02:00 Christian Gmeiner <christian.gmeiner at gmail.com>:
> Hi all
>
> 2015-06-09 15:04 GMT+02:00 Wolfgang Denk <wd at denx.de>:
>> Dear priyanka sharma,
>>
>> please keep the mailinmg list on Cc:
>>
>> In message <CAKynAoccK9AwcQrt-ggWRYj5RiTLtnf00+fU71=YMog+8eJZwA at mail.gmail.com> you wrote:
>>>
>>> Disabling auto negotiation along with limiting  ethernet PHY to 100MBit is
>>> a part of requirements for a custom solution.
>>
>> This does not actually answer my question.  What I'm interested to
>> understand is _why_ you want to do that.  As mentioned before,
>> autonegotiation is usually a good thing to have, and mandatory in many
>> cases.  If you disable it, you probably want to work around some
>> problem (eventually caused by broken or mis-designed hardware), and
>> depending on the nature of the problem there might be better ways to
>> solve it.
>>
>
> I have the same cosmetic issue (and can live with it). The cause to
> disable autoneg
> for my case is quite simple. On a custom imx6 based board the fec is
> directly connected via MII to an Ethernet switch (KSZ8895). In that
> case the link to
> the switch is always up and autoneg does not work. Under linux I am using the
> fixed phy device tree binding.
>

drivers/net/phy/micrel.c has support for the KSZ8895 - will give it a try :)

greets
--
Christian Gmeiner, MSc

https://soundcloud.com/christian-gmeiner