linux-kernel - Re: IMX23 usb instability on 3.9-rc5

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Date:	Sat, 6 Apr 2013 16:44:42 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	Alexandre Pereira da Silva <aletes.xgr@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org,
	alexander.shishkin@...ux.intel.com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	fabio.estevam@...escale.com,
	Otavio Salvador <otavio@...ystems.com.br>
Subject: Re: IMX23 usb instability on 3.9-rc5

Alexandre,

On Sat, Apr 6, 2013 at 4:39 PM, Alexandre Pereira da Silva
<aletes.xgr@...il.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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