Slow/broken USB and Ethernet on Snowballs/Origen boards?

Sangwook Lee sangwook.lee at linaro.org
Fri Mar 16 12:36:01 UTC 2012


Hi Mans

On 16 March 2012 11:50, Mans Rullgard <mans.rullgard at linaro.org> wrote:

> On 16 March 2012 04:14, Sachin Kamat <sachin.kamat at linaro.org> wrote:
> > Hi,
> >
> > On 15/03/2012, Mans Rullgard <mans.rullgard at linaro.org> wrote:
> >> On 14 March 2012 20:04, Jannis Pohlmann <
> jannis.pohlmann at codethink.co.uk>
> >> wrote:
> >>> Hi,
> >>>
> >>> I am currently playing with a couple of the development boards for
> which
> >>> there are Linaro hwpacks and LEBs. Since what I am trying to do
> requires
> >>> a lot of disk and network I/O, I've been paying special attention to
> the
> >>> data transfer rates I can get out of these boards.
> >>>
> >>> Below is a brief summary of my findings.
> >>>
> >>> 3) Origen
> >>>
> >>>  * the internal USB hub runs at Full Speed (12 MBit/s), resulting in a
> >>>    maximum USB disk I/O of 1.5 MByte/s
> >>>
> >>>  * since the board does not feature Ethernet itself, I tried to attach
> >>>    a USB Ethernet controller to it, but of course the transfer rate
> >>>    through that is by the I/O upper limit of the USB hub
> >>>
> >>>  * I did not test wireless but it is not feasible for what I am trying
> >>>    to do anyway
> >>
> >> Which kernel version are you using on the Origen?  I noticed the same
> >> problem
> >> a while back, but it appears to have been fixed in the Samsung landing
> team
> >> tree.  There is still another bug present in the Origen kernel
> preventing
> >> USB-ethernet working with EHCI.  Some patches have been posted, but they
> >> have not made it into the trees yet.
> >
> > These patches have been added to Samsung LT tree [1].
> >
> > [1] git://git.linaro.org/landing-teams/working/samsung/kernel.git
> > (branch: tracking)
>
> That branch still needs one more patch (attached).
>
> Thanks for looking at this git.

Initially I submitted patches with the call-back function
http://www.spinics.net/lists/linux-usb/msg59212.html

But maintainers  don't like to use call-back function, and it was rejected.
So Now LT doesn't to use this call-back function


> but it was
>
--
> Mans Rullgard / mru
>
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