On 05/04/2016 04:06 PM, Diego wrote: > In data mercoledì 4 maggio 2016 13:45:57, Marek Vasut ha scritto: >> On 05/04/2016 11:13 AM, Diego wrote: >>> In data martedì 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?
Hmmmmm :-( > For others following the thread, please post your experience, especially with > more recent drives (remember to test with files >16MB). I don't think it's really worth doing a thread about which sticks work and which don't. I would find it much more valuable to address this issue properly. I wonder if it would make sense to, instead of starting with a big value which might not work, start with a small(er) value and increase it with each subsequent block transfer. Quite similarly to what TCP does. Would you be willing to look into it ? > Diego > -- Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
