[U-Boot] Supporting two boards which are almost similar

[Detlev Zundel <dzu@denx.de>]

Hi Sudhakar,

> On Fri, Jun 25, 2010 at 16:40:19, Sudhakar Rajashekhara wrote:
>> Hi,
>> 
>> Spectrum digital has two versions of DM6467 EVM, DM6467 and DM6467T.
>> Though there are some video related differences between these two boards,
>> from U-Boot perspective the only difference the developer need to worry
>> is the different oscillator frequency. DM6467 has 27MHz crystal but
>> DM6467T has 33MHz crystal. Both these EVMs are registered as two different
>> boards in mach-types.h. Existing U-Boot has support DM6467 EVM which has
>> 27MHz crystal. How should I go about adding support for DM6467T EVM which
>> has 33MHz crystal? Do I need to add a new configuration file for this or
>> can I make use of the existing configuration file in any way?
>> 
>> One method I was aware of was, using some scripting from the top level
>> Makefile but I believe this is not recommended.
>> 
>
> Any other method of achieving this?

Actually I'm just in the process of answering your question.
My immediate response would have been "use -t for mkconfig" but this
does not (yet) work for boards.cfg versions.  So I'm just in the process
of testing a mkconfig extension to allow for similar handling of
"BOARD_OPTION1_OPTION2" configurations which will be split into
'CONFIG_MK_{BOARD,OPTION1,OPTION2}' defines.

When we have this, we can use a common config file and use #ifdefs for
these CONFIG_MK defines.

Stay tuned
  Detlev

-- 
A foolish consistency is the hobgoblin of little minds.
                                   -- Ralph Waldo Emerson             
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