[U-Boot] [PATCH v2 08/22] omap: add spl support

[Aneesh V]

Hi Wolfgang,
On Tuesday 17 May 2011 01:46 PM, Wolfgang Denk wrote:
> Dear Aneesh V,
>
> In message<4DD21CD8.2080409 at ti.com>  you wrote:
>>
>>> There are common, board independent parts both in spl/nand and
>>> spl/onenand.
>>
>> How about having them at the root level in 'spl/' ?
>
> Why? It seems more logical to me to group nand and onenand related
> files in their own subdirectories.

I do not have any issue in having media specific files in their 
respective directories. However, I would like to see the 'Makefile's 
coming from the same directory tree irrespective of the media. So, how 
about something like this:

spl/
     mmc/
     nand/
     one-nand/
     board/<vendor>/<board>/Makefile

The idea is to have the board level Makefile in 'spl/board/<vendor>
/<board>/' no matter what the SPL type is. This will help in better
consolidation of SPLs.

I see 3 SPL use-cases in general:
1. A single SPL that supports multiple media(suitable for SoCs with
large internal RAM)
2. A single SPL supporting a single media(the board supports only one
media)
3. Multiple SPLs for the same board each supporting a different
memory device(maybe preferred over 1 to keep the foot-print of each
small).

Supporting (1) and (2) is straight forward with the above directory
structure.

To support (3) the board level Makefile should conditionally
include the respective image file in the target 'all' based on CONFIG
options. For instance 'all' may include 'onenand-ipl-2k.bin' if
CONFIG_ONENAND_U_BOOT is defined and so on.

Please let me know if any of you have better ideas. I would like to
finalize on this before re-working on my patch-set.

best regards,
Aneesh