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

[Marek Vasut <marex@denx.de>]

On Thursday, February 04, 2016 at 09:21:08 AM, Schrempf Frieder wrote:
> On 03.02.2016 20:16, Sergei Temerkhanov wrote:
> > On Wed, Feb 3, 2016 at 8:40 AM, Marek Vasut <marex@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@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?

Nice! Can you share which sticks are those, ideally brand/type and USB IDs ?

Best regards,
Marek Vasut