[U-Boot] [PATCH 3/9] drivers: nand: Kconfig: add NAND as Kconfig option

[Scott Wood]

On Fri, 2016-04-01 at 19:41 -0400, Tom Rini wrote:
> On Fri, Apr 01, 2016 at 06:07:18PM -0500, Scott Wood wrote:
> 
> > On Fri, 2016-04-01 at 08:51 -0400, Tom Rini wrote:
> > > On Fri, Apr 01, 2016 at 04:59:44PM +0530, Mugunthan V N wrote:
> > > 
> > > > Add CONFIG_NAND as a Kconfig option so that it can be selected
> > > > using menuconfig or defconfig.
> > > > 
> > > > Signed-off-by: Mugunthan V N <mugunthanvnm at ti.com>
> > > 
> > > Good but you need to update configs/ to remove NAND from
> > > CONFIG_SYS_EXTRA_OPTIONS and add CONFIG_NAND=y
> > 
> > NACK
> > 
> > That CONFIG_NAND is a target-local option used by some boards to indicate
> > boot
> > source.  It is not equivalent to CONFIG_CMD_NAND which is what enables the
> > NAND subsystem.
> 
> Exactly!  We need to have 'NAND' moved from CONFIG_SYS_EXTRA_OPTIONS and
> into a real Kconfig entry.  That said, I think this might have forgotten
> to enable it in other places too but just 'NAND' needs to migrate out of
> where it is.

If we must start using NAND rather than CMD_NAND to enable the NAND subsystem
(which is what this patch does), then a lot more than that needs to change. 
 We'll need a new name for the boot source selection, and we'll need to
kconfigize all the boards that enable CONFIG_CMD_NAND via the board config
header.

-Scott