Re: [Ltib] slightly different kernel configs for subplatforms?

[Gernot Hillier]

Good morning!

Thanks for the quick answer!

The approach of qs857s with the preconfigs is exactly the thing I have
now but wanted to avoid. It duplicates the complete defconfig and
linux-foo.config.

For qs875s, this approach seems to make sense, as the defconfigs and the
linux-foo.configs seem to differ substantially.

In my case, however, the linux-foo.configs only differ in three lines
and the defconfigs only differ in one line (namely the linux-foo.config
to be used).

So I'm currently wasting 47kB only to change three lines for one
subplatform.

Therefore, I was looking for a mechanism which would allow to specify
small deviations for a defconfig and/or a linux-foo.config without
duplicating it completely.

Am 24.06.2010 21:09, schrieb Stuart Hughes:
> Take a look at config/platform/qs875s
> 
> There's a file in there called preconfigs.lkc, if you define one of
> these in your platform it enables you to have different configurations.
>  So you can use this to select different packages and/or kernels and
> configurations.
> 
> Unfortunately I haven't got time right now to document this, but if you
> build and play with it, it should be fairly easy to figure out.
> 
> Regards, Stuart
> 
> Gernot Hillier wrote:
>> Hi there!
>>
>> I'm again working on integrating a slightly different mpc837x platform
>> into LTIB mainline.
>>
>> There are three subtypes for this platform (mpc8377/8/9) with slightly
>> different kernel configurations (two are identical, the third differs in
>> three kernel options).
>>
>> Now I wonder if there's a more elegant solution than adding the same
>> 35kB of linux-...config to config/platform/xxx three times with only
>> slight modifications.
>>
>> Is there a (simple) possibility to have diffs applied to the kernel
>> config or to modify kernel configuration manually in the spec file for a
>> certain platform?
>>
>> TIA!
>>

-- 
Gernot Hillier

Siemens AG, Corporate Technology, CT T DE IT 1
Program "Open Source Platforms", GTF System Architecture & Platforms