[yocto] Correct way to use a custom bsp .scc file in morty

[Bruce Ashfield]

On 2017-01-20 09:19 AM, George McCollister wrote:
> On Thu, Jan 19, 2017 at 5:24 PM, Bruce Ashfield
> <bruce.ashfield at windriver.com> wrote:
>> On 2017-01-19 6:20 PM, George McCollister wrote:
>>>
>>> What's the correct way to use a custom bsp .scc file located in my
>>> custom bsp layer? For purposes of this email let's say it's name is
>>> myplatform-preempt-rt.scc. If I specifically add it to the
>>> yocto-linux-rt_4.4 SRC_URI it appears to get processed twice by scc
>>> according to the meta-series output file. It then tries to apply
>>> patches to standard/preempt-rt/base that don't apply. When building on
>>> a intel-core2-32 platform, intel-core2-32-preempt-rt.scc only gets
>>> processed once and no incorrect patches are applied.
>>
>>
>> Something could have broken, I never rule out bugs!
>>
>> Morty had some different semantics than the newer branches (which
>> are simplified compared to the auto-resume logic in old releases).
>>
>> That being said, the capability to have a BSP description in the
>> SRC_URI is there, and did work during that release cycle. To have
>> it work, you do need the right format in the BSP .scc file, in
>> particular something with the KMACHINE and KTYPE descriptions will
>> be seen as an entry point, and not trigger the re-application of
>> the inherited patches.
>>
>> Is there any way that I can see the contents of that .scc file ?
>> Otherwise, I can spin up a morty build and mock something up
>> myself.
>
> Bruce,
>
> I stripped down my bsp later and pushed it github. You can find the
> BSP .scc (and the files it includes) here:
> https://github.com/gmccollister/meta-orion-minimal-bsp/tree/master/recipes-kernel/linux/linux-yocto/orion-io
>
> The linux-yocto-rt_4.4.bbappend that adds orion-io-preempt-rt.scc to
> the SRC_URI is here:
> https://github.com/gmccollister/meta-orion-minimal-bsp/blob/master/recipes-kernel/linux/linux-yocto-rt_4.4.bbappend

Great. I'll take it for a spin and follow up when I know more.

Bruce

>
> -George
>
>>
>> Bruce
>>
>>
>>>
>>> If I don't include it in the yocto-linux-rt_4.4 SRC_URI it's never
>>> applied at all. I'm wondering if this a new problem with the last big
>>> push to morty since I didn't notice this before.
>>>
>>> I also verified that I can make myplatform-preempt-rt.scc work by
>>> doing the following (only shows as processed once in meta-series and
>>> no incorrect patches applied):
>>> bitbake -c cleanall linux-yocto-rt
>>> bitbake -c unpack linux-yocto-rt
>>> Manually copy myplatform-preempt-rt.scc and related .scc, .cfg files
>>> to the following path:
>>>
>>> work/myplatform-oe-linux-gnueabi/linux-yocto-rt/4.4.36+gitAUTOINC+b846fc6436_61d7bf47fe-r0/kernel-meta/bsp/myplatform/
>>> bitbake -c compile linux-yocto-rt
>>>
>>> Regards,
>>> George McCollister
>>>
>>