From mboxrd@z Thu Jan  1 00:00:00 1970
From: Diego <diego.ml@zoho.com>
Date: Wed, 04 May 2016 16:06:10 +0200
Subject: [U-Boot] Issue with USB mass storage (thumb drives)
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In data mercoled? 4 maggio 2016 13:45:57, Marek Vasut ha scritto:
> On 05/04/2016 11:13 AM, Diego wrote:
> > In data marted? 3 maggio 2016 23:01:10, Marek Vasut ha scritto:
> >> On 04/29/2016 09:58 AM, Diego wrote:
> >>> For me it fails for files bigger than 16MB:
> >> Ha ok, I see it now. According to the bus analyzer, the stick Acks long
> >> block transfer, but then just times out, I guess because it prepares the
> >> data or something. Just a dummy question, did you try reducing
> >> USB_MAX_XFER_BLK ? Try with 4096 instead of 65536 , that might work.
> > 
> > Hi Marek,
> > 
> > that was the original argument of my mail thread:
> > http://lists.denx.de/pipermail/u-boot/2016-April/251799.html
> > Changing USB_MAX_XFER_BLK from 65535 to 32767 definitely fixed the "EHCI
> > timed out on TD".
> > 
> > I was questioning what was the best approach to fix the problem.
> > It seems that 65536 doesn't work for quite some USB thumb drives. Seeing
> > my
> > experience, my coworker's experience, and previous mails in this same
> > thread, I'd guess something like 50% or lower work with 65535, while
> > something like 90% or more work with 32767.
> > http://lists.denx.de/pipermail/u-boot/2016-February/245893.html
> > 
> > So I see three options:
> > 1) 65535 default with quirk table
> > 2) 32767 default without quirk table
> > 3) 32767 default with quirk table
> > 
> > Personally I think 3) would be the safest solution, but I think 2) would
> > at
> > least work for most thumb drives.
> 
> 1) with the quirk table would be the way to go, modern(ish) drives
> should work fine with 65535 .
> 

I personally can't see any improvement with more recent thumb drives, quite 
the opposite.
WORKING WITH 65535:
- ancient Sandisk 256MB
	ID 0781:5151 SanDisk Corp. Cruzer Micro Flash Drive
- old Sony 8GB
	ID 054c:0243 Sony Corp. MicroVault Flash Drive
- recent Kingston DT101 G2 16GB
	ID 0951:1642 Kingston Technology DT101 G2

NOT WORKING WITH 65535:
- recent Kingston G3 16GB
	ID 0951:1665 Kingston Technology Digital DataTraveler SE9 64GB
- new Kingston USB 2.0 8GB
	ID 0951:1689 Kingston Technology DataTraveler SE9
- brand new Kingston G2 16GB / 32GB USB 3.0
	ID 0951:1666 Kingston Technology DataTraveler G4

Why are you saying modern(ish) drives should work?

For others following the thread, please post your experience, especially with 
more recent drives (remember to test with files >16MB).

Diego