[U-Boot] [PATCH] tsec: Wait for auto-negotiation to complete without link

[Andy Fleming]

On Wed, Feb 4, 2009 at 3:26 PM, Wolfgang Denk <wd at denx.de> wrote:
> Dear Andy Fleming,
>
> In message <2acbd3e40902041320l3bce93c1p989c4c33ca8e7ae at mail.gmail.com> you wrote:
>>
>> Hmmm....I made that change for a reason.  Waiting for autonegotiation
>> to finish on a tsec with no link was quite tiresome.  If you've hooked
>> up the 4th tsec, and try to boot, you end up waiting for *three* tsecs
>> to timeout.  If dhcp fails because the link isn't up you can always
>> try again, or add a delay before dhcp starts so that the link is up.
>
> Why that? Don't you always enable only the interface you are trying to
> use?

The problem is that you don't always know which interface you have
hooked up.  So u-boot tries the one set in ethact, and then the next,
etc.  With the old method, the penalty for being wrong was quite high.
 I hadn't run into an issue with the link not being up.  Why don't we
look up the spec, and find out the maximum time we'd have to wait for
that to happen.  That way we get the best of both worlds.  My sense is
that the link comes up fast, but autonegotiation potentially takes a
while.

Andy