Re: [Gumstix-users] Overo STORM USB Failures

[Niek K. <n....@mo...>]

Yes, i also manually applied the patch and that was pretty straightforward. Never had any problems during boot so I leave the uboot patch as suggested by Ash out. Ill keep you updated if we see the problems again.

Greetings Niek

-----Original Message-----
From: Hapgood, Ryan (STRX) [mailto:Rya...@ka...] 
Sent: maandag 5 augustus 2013 23:55
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Overo STORM USB Failures

Niek,

I manually applied the changes to a 3.4 Sakoman kernel easily. I would suggest you could do the same to 3.5 with no problems.

>From what we have experienced I would definitely give it a try.

Regards,
Ryan.

-----Original Message-----
From: Niek Kooij [mailto:n....@mo...]
Sent: Monday, 5 August 2013 5:51 PM
To: General mailing list for gumstix users.
Subject: Re: [Gumstix-users] Overo STORM USB Failures

Hi Ryan,

We also have been seeing USB problems (sometimes ending with the "disabled by hub (EMI?)" message). We are using the FireSTORM and the IronSTORM with the 3.5 Sakoman kernel. We attach a lot of USB devices to our system (via a powered hub) so we were blaming that part for the problems :).  This patch is for 3.5 Sakoman?

Greetings Niek

-----Original Message-----
From: Hapgood, Ryan (STRX) [mailto:Rya...@ka...]
Sent: maandag 5 augustus 2013 6:18
To: gum...@li...
Subject: [Gumstix-users] Overo STORM USB Failures

We are experiencing USB failures ("disabled by hub (EMI?)") on a significant number of WaterSTORM COMs (~10% in manufacturing) and it is starting to look like it's caused by the clock issues described in the DM3730 & DM3725 Silicon Errata (SPRZ319E) (P112).

It seems that some COMs are less susceptible than others but according to the errata a 26MHz system clock the problem cannot be truly eliminated, just reduced. To reduce the problem I have tried the following kernel changes:

https://bitbucket.org/sr105/linux-sakoman/commits/01cfa0831c55496c27ee3fc6a1141ad73f4020fc

and things are looking promising but I have noticed that these changes are not in Steve Sakoman's kernel by default. 
Anyone else having these problems?
Is anyone else using these changes? 

We are dealing with Gumstix on this matter also, but I thought others may benefit from the heads up.

Regards,
Ryan Hapgood
Digital Development Manager
        



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