[yocto] Board specific bbappend file

[Stefan Roese]

Hi Bruce,

On 05.12.2013 17:09, Bruce Ashfield wrote:
>> I'm trying to add a board specific *.bbappend file to a recipe. To add
>> board specific informations/settings to this recipe but without changing
>> the common (generic) recipe (*.bb) file. Something like this:
>>
>> recipe:
>> linux-xyz_3.12.bb
>>
>> board-specific append file:
>> linux-xyz-board-foo_3.12.bbappend
>>
>>  From the documentation I read:
>> "
>> Append files must have the same root names as their corresponding
>> recipes. For example, the append file someapp_1.5.1.bbappend must apply
>> to someapp_1.5.1.bb.
>> "
>>
>> So it seems impossible to "encrypt" the board name into the bbappend
>> file name. Or am I missing something?
>>
>> If not, is there another way to add such board-specific stuff to a
>> recipe without changing the generic recipe?
> 
> What exactly are you tried to change on a per-board basis ? Assuming
> it is variables, you can use the standard OVERRIDES mechanism to
> have a version specific bbappend, that changes variables on a per
> board basis.
> 
> i.e.
> 
>       FOO_<machine name> = "bar"
>       FOO_<another machine name> = "bar2"
> 
> Assuming the generic recipe uses these variables appropriately, you'll
> be fine.

Specifically its the SRC_URI / SRC_URI_append variable (e.g. for a linux
kernel and u-boot etc). And since this one is used in many recipes, I
can't just put those settings in the machine conf file.

Do you have any recommendations how to change this variable (per recipe)
without touching the generic bb file?

Thanks,
Stefan