From mboxrd@z Thu Jan 1 00:00:00 1970 From: Diego Date: Wed, 04 May 2016 11:13:51 +0200 Subject: [U-Boot] Issue with USB mass storage (thumb drives) In-Reply-To: <57291196.9030901@denx.de> References: <6271677.LhHn0SdMV3@ip-192-168-197-87.eu-west-1.compute.internal> <6761027.omEggy50Dr@localhost.localdomain> <57291196.9030901@denx.de> Message-ID: <2082654.7tPcRGBzMV@localhost.localdomain> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de In data marted? 3 maggio 2016 23:01:10, Marek Vasut ha scritto: > On 04/29/2016 09:58 AM, Diego wrote: > > In data venerd? 29 aprile 2016 00:49:22, Marek Vasut ha scritto: > >> Urgh, so you seem to have third revision of this stick. I have two > > > >> sticks which are exactly the same and work in U-Boot on MX6 wandboard: > > Hi Marek, > > > > how big is the file you're trying to load? > > > > 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. As the transfer speed wouldn't be affected much for 32767: http://lists.denx.de/pipermail/u-boot/2016-February/246267.html and as the quirk table for 65535 would grow quite a lot with time, I think. Bests, Diego