[U-Boot] Issue with USB mass storage (thumb drives)

[Schrempf Frieder]

On 03.02.2016 20:16, Sergei Temerkhanov wrote:
> On Wed, Feb 3, 2016 at 8:40 AM, Marek Vasut <marex at denx.de> wrote:
>> On Wednesday, February 03, 2016 at 12:49:20 PM, Schrempf Frieder wrote:
>>> On 03.02.2016 12:12, Marek Vasut wrote:
>>>> On Wednesday, February 03, 2016 at 11:15:00 AM, Schrempf Frieder wrote:
>>>>> On 03.02.2016 10:55, Fabio Estevam wrote:
>>>>>> On Wed, Feb 3, 2016 at 7:40 AM, Marek Vasut <marex at denx.de> wrote:
>>>>>>> In that case, debug time.
>>>>>>>
>>>>>>> Usual problems are bad routing of the tracks on the board , so try
>>>>>>> with USB 1.1 hub and if that works, that's your problem.
>>>>>> Another suggestion would be to try the 100MB transfer in Linux and see
>>>>>> if this works or not.
>>>>>>
>>>>>> That would help us to narrow down whether this is a hardware or
>>>>>> software problem.
> Another thing to try may be limiting the value of USB_MAX_XFER_BLK in
> common/usb_storage.c

This was a really helpful hint! Thank you Sergei!

I just tried to limit USB_MAX_XFER_BLK to 1/8 of the original value 
(65535 -> 8191) and this time the transfer works without timeouts.

As we have a customer who needs this working as soon as possible my 
question now is how to properly solve this.
Should I generally limit USB_MAX_XFER_BLK in my u-boot to avoid these 
errors? Which value to choose?