[U-Boot] [PATCH v9 15/30] autoconfig.mk: Make it possible to define configs from other configs

[Tom Rini]

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On 03/06/2013 01:59 PM, Benoît Thébaudeau wrote:
> Give more flexibility to define configs that can be interpreted by
> make, e.g. to define fallback values of configs like in the example
> below.
> 
> Before this change, the config lines: #define CONFIG_SPL_MAX_SIZE
> 2048 #define CONFIG_SPL_PAD_TO	CONFIG_SPL_MAX_SIZE would have been
> changed in autoconfig.mk into: CONFIG_SPL_MAX_SIZE=2048 
> CONFIG_SPL_PAD_TO="CONFIG_SPL_MAX_SIZE"
> 
> Hence, a make recipe using as an argument to $(OBJCOPY): 
> --pad-to=$(CONFIG_SPL_PAD_TO) would have issued: 
> --pad-to="CONFIG_SPL_MAX_SIZE" which means nothing for $(OBJCOPY)
> and makes it fail.
> 
> Thanks to this change, the config lines above are changed in
> autoconfig.mk into: CONFIG_SPL_MAX_SIZE=2048 
> CONFIG_SPL_PAD_TO=$(CONFIG_SPL_MAX_SIZE)
> 
> Hence, the make recipe above now issues: --pad-to=2048 as expected
> from the defined config.
> 
> Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau at advansee.com>

Reviewed-by: Tom Rini <trini at ti.com>

- -- 
Tom
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