[U-Boot] [PATCH] Add CONFIG_GMAC_TX_DELAY=4 for OlinuXino Lime2

[Tom Rini]

On Tue, Mar 15, 2016 at 07:09:14PM +0100, Karsten Merker wrote:
> On Tue, Mar 15, 2016 at 06:41:39AM +0100, Michael Haas wrote:
> 
> > This change is required to get GBIT Ethernet to work
> > reliably on my board. Without CONFIG_GMAC_TX_DELAY=4, the connection
> > suffers severe packet loss and SSH becomes unusable.
> > 
> > --- 192.168.1.1 ping statistics ---
> > 100 packets transmitted, 100 received, 0% packet loss, time 19842ms
> > rtt min/avg/max/mdev = 0.260/0.334/0.527/0.038 ms
> > 
> > I have also tried CONFIG_GMAC_TX_DELAY=3, which still
> > yielded 11-13% packet loss.
> 
> Hello,
> 
> unfortunately this change doesn't solve the gigabit issues
> on my LIME2 - it even seems to make them worse on my board.

Sometimes I wonder if we don't need to make a way to make this tweakable
at run time instead.  On my board I forget what the setting is that
makes it mostly usable, but it's not the default one for sure.

-- 
Tom
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