[U-Boot] [PATCH] NAND: Allow nand_ids and nand_bbt to be compiled in SPL

[Scott Wood <scottwood@freescale.com>]

On 01/05/2012 08:15 AM, Tom Rini wrote:
> On Thu, Jan 5, 2012 at 2:09 AM, Marek Vasut <marek.vasut@gmail.com> wrote:
>>> I'll confirm gc-sections/etc are not as awesome as we think.  You can
>>> drop the size of current SPL builds (for say devkit8000) by taking
>>> things that should be dropped for us and forcing them out with #ifndef
>>> CONFIG_SPL_BUILD.
>>
>> Maybe if we had those LTO tables at the gc-sections time, it'd drop. But we
>> can't rely on those.
>>
>> So instead of compiling in the nand-ids, it'd be better to allow SPL to pull in
>> the whole NAND/MTD stack.
> 
> Possible, but without doing #Ifndef hacks, the size grows a good bit
> (don't have the #s handy right now), and with #ifndef hacks it's just
> a kb or so in growth.

Whatever the set of things is that you want to pull in for these SPLs,
it needs to be a separate config option from the one that enables
libnand.o to be included, so that other SPLs can pull in smaller NAND
implementations.

Is there any reason to keep defines like CONFIG_SPL_NAND_SUPPORT (versus
LIBS-y += drivers/mtd/nand/libnand.o), if everything within that
directory needs a separate config symbol to enable it inside an SPL
(just like a normal build)?

-Scott