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

Mans Rullgard mans.rullgard at linaro.org
Thu Mar 15 13:26:03 UTC 2012


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.  Search the mailing lists for s5p usb burst
to find them.

-- 
Mans Rullgard / mru



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