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

Tushar Behera tushar.behera at linaro.org
Mon Mar 19 09:49:22 UTC 2012


On 03/16/2012 05:20 PM, Mans Rullgard 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 Mans for the patch. I have applied it to our tree. [1]

I would be nice if you can test this kernel once.

[1] git://git.linaro.org/landing-teams/working/samsung/kernel.git (tracking)
> 
> 
> 
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-- 
Tushar Behera



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