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

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Date:	Mon, 16 Dec 2013 04:08:43 +0000
From:	Caizhiyong <caizhiyong@...ilicon.com>
To:	Huang Shijie <b32955@...escale.com>
CC:	Huang Shijie <shijie8@...il.com>,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <David.Woodhouse@...el.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

> -----Original Message-----
> From: Huang Shijie [mailto:b32955@...escale.com]
> Sent: Monday, December 16, 2013 11:07 AM
> To: Caizhiyong
> Cc: Huang Shijie; Brian Norris; David Woodhouse; Quyaxin;
> linux-kernel@...r.kernel.org; linux-mtd@...ts.infradead.org; Artem Bityutskiy;
> Wanglin (Albert); David Woodhouse
> 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. :)

I have not found a good way to solve these problems. I expect your patch.

> 
> thanks
> Huang Shijie
> 

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