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Date: Mon, 26 Apr 2010 13:34:34 -0500
From: Scott Wood <scottwood@freescale.com>
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To: Ron Madrid <ron_madrid@sbcglobal.net>
Subject: Re: MPC8313: fsl_elbc_nand and MDR
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Ron Madrid wrote:
> I am having what appears to be a little conflict
> with this driver, particularly with the MDR.  My
> hardware uses NAND flash and an FPGA connected
> through the UPM.  After the kernel is up and
> running, sometimes I cannot verify the data in
> the UPM RAM array.  I am guessing right now that
> this is due to a use conflict between my
> application and the fsl_elbc_nand driver both
> trying to use the MDR at once.
> 
> Is there currently any sort of coordination that
> exists for the MDR in the fsl_elbc_nand driver?
> I have been looking through the code and have
> not been able to find any.

There is not yet any such coordination.  The current UPM code does not 
use MDR that I can see.

> Any ideas on how to solve this would be
> appreciated as well.

Probably just add a mutex that protects the shared resources.

-Scott