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Subject: Re: XD/smartmedia - how to implement it right?
From: Maxim Levitsky <maximlevitsky@gmail.com>
To: Alex Dubov <oakad@yahoo.com>
Cc: =?ISO-8859-1?Q?J=F6rn?= Engel <joern@logfs.org>,
       linux-kernel <linux-kernel@vger.kernel.org>, arnd@arndb.de,
       tglx@linutonix.de
In-Reply-To: <716701.11435.qm@web37602.mail.mud.yahoo.com>
References: <716701.11435.qm@web37602.mail.mud.yahoo.com>
Content-Type: text/plain; charset="UTF-8"
Date: Sat, 28 Nov 2009 12:36:39 +0200
Message-ID: <1259404599.15208.6.camel@maxim-laptop>
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On Fri, 2009-11-27 at 23:22 -0800, Alex Dubov wrote: 
> > 
> > The "mtd uses blocking calls" argument I can help
> > with.  For some other
> > project I've added non-blocking calls to mtd[1].
> > 
> > Biggest problems I see are a) the userspace interface and
> > b) allowing
> > both raw flash access through MTD and block device access
> > with an FTL.
> > 
> > [1] http://lists.infradead.org/pipermail/linux-mtd/2009-November/028065.html
> > 
> > Jörn
> 
> I actually tried several approaches to this problem and I think, I have a good idea about how to create a fully asynchronous mtd driver, which can handle different device models. Unfortunately, I had other commitments so I couldn't advance my mtd stuff.
> 
> Recently I was going to go back to it, but then I was asked to implement some additional functionality in rapidio subsystem, which I'll have to take care of first.

Hi, 

First of all, thank you very much for your contributions.
Could you explain, why we need an asynchronous mtd driver?

Also, as I understand the command interface more and more, it seems that
'magically' xD card had same interface as standard NAND flash chip.

I think I can implement the driver for each controller just like an nand
chip driver.

Best regards,
Maxim Levitsky


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