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

Mans Rullgard mans.rullgard at linaro.org
Fri Mar 16 11:50:22 UTC 2012


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).

-- 
Mans Rullgard / mru
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