phylib does not wait for link

[Jean-Christophe PLAGNIOL-VILLARD]

On 09:46 Wed 24 Oct     , Sascha Hauer wrote:
> The current phylib behaviour is unusable for unattended network boot, we
> need to do something about it.
> 
> We currently have no instance that would wait until a link comes up.
> This may work for the default-3-seconds-boot-timeout which is enough for
> most phys, but fails with smaller timeouts.
> 
> There are several places in which we could wait for a link to come up, I
> have no idea which one is the best:
> 
> - eth_send
yes with timeout
> - phylib
no
> - in the protocols (dhcp, ping, ...)
no too many
> 
> Anyway, this deserves fixing before the next release.
> 
> Sascha
> 
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