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

Caizhiyong
2013-12-16T04:10:34Z

> -----Original Message-----
> From: Huang Shijie [mailto:b32955@freescale.com]
> Sent: Monday, December 16, 2013 11:07 AM
> To: Caizhiyong
> Cc: Huang Shijie; Brian Norris; David Woodhouse; Quyaxin;
> linux-kernel@vger.kernel.org; linux-mtd@lists.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
>