linux-kernel - Re: [PATCH 10/15] MTD: nand: make reads using MTD_OOB

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Date:	Mon, 22 Feb 2010 23:28:07 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Alex Dubov <oakad@...oo.com>, joern <joern@...fs.org>,
	stanley.miao@...driver.com, Vitaly Wool <vitalywool@...il.com>
Subject: Re: [PATCH 10/15] MTD: nand: make reads using MTD_OOB_RAW affect
 only ECC validation

On Mon, 2010-02-22 at 22:20 +0100, Thomas Gleixner wrote: 
> On Mon, 22 Feb 2010, Maxim Levitsky wrote:
> 
> > This changes the behavier of MTD_OOB_RAW. It used to read both OOB and data
> > to the data buffer, however you would still need to specify the dummy oob buffer.
> > 
> > This is only used in one place, but makes it hard to read data+oob without ECC
> > test, thus I removed that behavier, and fixed the user.
> > 
> > Now MTD_OOB_RAW behaves just like MTD_OOB_PLACE, but doesn't do ECC validation
> 
> Is this tested against existing user space tools like nanddump ? Can I
> still get the raw data from flash ?

Thats the point.
Userspace doesn't/can't use that mode.
It is not exposed through mtdchar.
Userspace reads the page, and then reads the oob.

It does use MTD_OOB_RAW, but without data buffer, and this path I don't
change.

The only user of this, is the nand itself, when it reads bad block
table.

I confess that I didn't run test that I ported this code correctly.
But I did logically verified many times that the new code works just
like old one.


Best regards,
Maxim Levitsky

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