[U-Boot] [PATCH] ARM: mxs: Do not reconfigure FEC clock in FEC init

[Marek Vasut]

Dear Stefano Babic,

> Hi Marek,
> 
> On 13/10/2013 17:20, Marek Vasut wrote:
> > Do not reconfigure the FEC clock during board_eth_init(), otherwise
> > the FEC might have stability issues, refuse to autonegotiate link
> > entirely or even corrupt packets while indicating correct checksum
> > on them. Instead, move the FEC clock init to board_early_init_f(),
> > where all the other upstream clock are initialized and also make
> > sure there is proper stabilization delay.
> 
> However, it seems to me that moving the code remove the problem on the
> mx28evk without finding the cause. Really there is still a big chunk of
> time between the initialization of the clock and the first packet is
> sent to the network, when the autonegotiation should occur.

Forget this, the issue is still present. Damn!

It's at least a little clearer to me what happens now. The FEC fails to transmit 
an TFTP block ACK packet -> the server waits 5 seconds -> sends ARP packet -> 
FEC replies and resends the TFTP block ACK again. Why does the FEC swallow a TX 
packet, I don't know.

Best regards,
Marek Vasut