[U-Boot] Add spi nand support in u-boot

[Peter Pan 潘栋 (peterpandong)]

On 5 May 2015 at 16:105, Jagan Tek
> On 4 May 2015 at 06:19, Peter Pan 潘栋 (peterpandong)
> <peterpandong at micron.com> wrote:
> > Hi All,
> >
> > I’d like to add spi nand support in u-boot. But I don’t know where
> should
> > the spi nand drivers put in and how to define the architecture.
> >
> > I find that currently spi_flash in u-boot means spi nor flash. Should
> I create
> > a struct spi_nand_flash or make spi_flash compatible?
> 
> You have asked this again! check this[1]
> 
> [1] https://www.mail-archive.com/u-boot@lists.denx.de/msg171066.html
> 
> thanks!
> --
> Jagan.

Thanks for your reply. I missed your previous reply for some reason.
I will start to porting Linux spi nand patch to u-boot soon. 

Another question, I find that I can't pass read/write bits(4 pin mode or 2 pin mode)
through spi_xfer(). Is there any way to do that?

Thanks
Peter Pan