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

[Marek Vasut <marex@denx.de>]

On Tuesday, February 02, 2016 at 05:28:42 PM, Fabio Estevam wrote:
> Adding Marek in case he has any ideas.
> 
> On Tue, Feb 2, 2016 at 8:35 AM, Schrempf Frieder
> 
> <frieder.schrempf@exceet.de> wrote:
> > Hello,
> > 
> > I'm using U-Boot on a custom i.MX6 board and I'm having problems while
> > reading (large) files from USB thumb drives.
> > I wouldn't really mind if this only happened with some specific USB
> > device, but the problem occurs with 3 out of 4 tested thumb drives while
> > loading a 100M test file.
> > The devices that work seem to be rather old ones.
> > 
> > The same issue is also reported here:
> > https://community.freescale.com/thread/377911
> > 
> > I can reproduce this behaviour with u-boot-imx v2014.04 and with
> > mainline u-boot v2015.10 and v2016.01.
> > 
> > Can someone tell me if this is a known issue?
> > What could be the reason for this and how can I get this working?
> > 
> > Thanks!
> > 
> > 
> > U-Boot 2016.01 (Feb 02 2016 - 10:31:32 +0100)
> > 
> > CPU:   Freescale i.MX6SOLO rev1.3 at 792MHz
> > CPU:   Industrial temperature grade (-40C to 105C) at 31C
> > Reset cause: POR
> > Board: MX6EXCEET
> > DRAM:  1 GiB
> > NAND:  256 MiB
> > MMC:   FSL_SDHC: 0, FSL_SDHC: 1
> > SF: Detected EN25Q80 with page size 256 Bytes, erase size 4 KiB, total 1
> > MiB No panel detected: default to Hannstar-XGA
> > Display: Hannstar-XGA (1024x768)
> > In:    serial
> > Out:   serial
> > Err:   serial
> > Net:   Found Micrel KS8051/KS8081 PHY
> > FEC
> > Hit any key to stop autoboot:  0
> > => usb start
> > starting USB...
> > USB0:   Port not available.
> > USB1:   USB EHCI 1.00
> > scanning bus 1 for devices... 2 USB Device(s) found
> > 
> >         scanning usb for storage devices... 1 Storage Device(s) found
> >         scanning usb for ethernet devices... 0 Ethernet Device(s) found
> > 
> > => fatload usb 0 0x18000000 test.file
> > reading test.file
> > EHCI timed out on TD - token=0xac008d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x128d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x801f8c80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x801f8c80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x801f8c80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x801f8c80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x80008d80
> > EHCI timed out on TD - token=0x80008d80
> > Error reading cluster
> > ** Unable to read file test.file **

What happens if you do 'dcache off' and then read the file ?