[U-Boot] TFTP pause and timeout on MX28 platforms

[Hector Palacios <hector.palacios@digi.com>]

Dear Marek Vasut,

On 03/13/2013 05:19 PM, Marek Vasut wrote:
> Dear Hector Palacios,
>
>> Dear Marek Vasut,
>>
>> On 03/13/2013 11:58 AM, Marek Vasut wrote:
>>> Dear Hector Palacios,
>>>
>>>> Hello,
>>>>
>>>> When doing large TFTP downloads (files bigger than 10MiB) on my MX28
>>>> platform I'm sometimes experiencing pauses and timeouts. U-Boot will
>>>> eventually restart the transmission and sometimes may successfully
>>>> complete the download, but other times it won't.
>>>> On my platform it was somewhat mitigated (but not resolved) by reverting
>>>> this patch from Marek:
>>>>
>>>> commit 67449098a86be18cbdb27345bebe8da57e5d8899
>>>> Author: Marek Vasut <marex@denx.de>
>>>> Date:   Wed Aug 29 03:49:50 2012 +0000
>>>>
>>>>        FEC: Rework the TX wait mechanism
>>>>
>>>> The problem is reproducible in Freescale's MX28EVK.
>>>> The larger the file, the more chances to see the problem. Please try
>>>> with 50MiB files or larger. Has anybody else seen it?
>>>>
>>>> On an old U-Boot v2009 TFTP transmission was twice slower than with
>>>> v2013, but didn't suffer from this.
>>>
>>> What version of u-boot do you use ? It was resolved in recent versions.
>>
>> I'm using v2013.01.
>> Could you please point me to the commit(s) that solve it?
>> The commits I see on drivers/net/fec_mxc.c after v2013.01 are from Troy
>> Kisky and don't seem to address this.
>
> commit c0b5a3bbb0cd40a6b23b7b07e2182a5bcdc8c31c
> Author: Marek Vasut <marex@denx.de>
> Date:   Wed Aug 29 03:49:51 2012 +0000
>
>      FEC: Replace magic contants
>
> and the three before this one. Is your PHY operating correctly? This fixed the
> hangs on multiple MX28 platforms for me.

v2013.01 contains all these patches but I was able to reproduce this both on my 
platform and on the mx28evk.
My problem is not a hang, but TFTP pauses (1 to 3 seconds) and timeouts:
      #################################################################
      #####################################################T T T T T T

At first I thought it was my platform's PHY (Micrel KSZ8031) but I also see it on mx28evk.

-- 
H?ctor Palacios