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SubjectRe: IMX23 usb instability on 3.9-rc5
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On Sat, Apr 6, 2013 at 4:44 PM, Fabio Estevam <festevam@gmail.com> wrote:
> Maybe bad DDR initialization? Are using U-boot or bootlets to setup the DDR?
>
> What is your DDR frequency: 133 or 96MHz? I saw some posts in the
> olimex forum that people had to run it at 96MHz to get stable
> operation.

Thanks Fabio,

That seems to be the case. I did two of the mods sugested on olimex forums.
1) Remove R17.
2) Drop DDR speed to 96MHZ.

The first improved the behavior a lot, but still have crashes. The
second have almost eliminated them.

On Sat, Apr 6, 2013 at 4:44 PM, Fabio Estevam <festevam@gmail.com> wrote:
> Alexandre,
>
> On Sat, Apr 6, 2013 at 4:39 PM, Alexandre Pereira da Silva
> <aletes.xgr@gmail.com> wrote:
>> Hello,
>>
>> I am testing a usb key connected on a IMX23-Olinuxino board. The
>> kernel panics at heavy usb trafic. This was build with the mxs
>> defconfig
>>
>> This happens everytime with "dd if=/dev/sda of=/dev/null bs=4k". The
>> messages of the failure varies a lot from run to run.
>
> Maybe bad DDR initialization? Are using U-boot or bootlets to setup the DDR?
>
> What is your DDR frequency: 133 or 96MHz? I saw some posts in the
> olimex forum that people had to run it at 96MHz to get stable
> operation.


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