linux-kernel - Re: [PATCH] mtd: increase max page/OOB size to support 16K pagesize NAND

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Message-ID: <20131216030649.GA27109@shlinux2.ap.freescale.net>
Date:	Mon, 16 Dec 2013 11:06:51 +0800
From:	Huang Shijie <b32955@...escale.com>
To:	Caizhiyong <caizhiyong@...ilicon.com>
CC:	Huang Shijie <shijie8@...il.com>,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Quyaxin <quyaxin@...ilicon.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
	"Wanglin (Albert)" <albert.wanglin@...ilicon.com>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] mtd: increase max page/OOB size to support 16K
 pagesize NAND

On Mon, Dec 16, 2013 at 02:03:54AM +0000, Caizhiyong wrote:
> > >
> > > There are a lot of 16K page size NAND, they are used in android system.
> > >
> > > Many NAND need read retry and data randomization, kernel does not support this
> > feature.
> > Brian is adding the read-retry feature.
> > 
> > I think the data randomization should be done by the hardware.
> > If we do it by software, it costs lot of the cpu cycles.
> >
> > 
> > > Kernel also does not support synchronous NAND.
> > 
> > The synchronous NAND should be supported by the nand controller driver,
> > not the kernel.
> 
> Yes. Those feature should be support by NAND controller hardware and driver.
> But the driver does not know what NAND should use those feature.
> Perhaps, the NAND id table, should add something.
We can get the synchronous info from the ONFI nand.

In actually, if you do not add this patch, i will change it too.
I have several 16K nand chips on my hands now. :)

thanks
Huang Shijie


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