Newbie Question regarding custom layer and populate_rootfs

Newbie Question regarding custom layer and populate_rootfs

[public-hk]

Hi all,
I have recently started to use Yocto. I also figured out a lot y myself
already. However, there is one problem I just can not solve. Sorry if
this is a dumb question..

My purpose is to create a customized distro for the Raspberry 2 which I
managed to get up and running. Yesterday, I tried to create a customized
splash image on bootup. That can be done via the psplash tool.

The current image that I create incorporates a recipe from the layer
meta-raspberry/recipes-core/psplash which adds a bbappend File and a
corresponding header which origins back to PNG file. This rule is
responsible for the typical bootup screen.

I myself created another layer meta-myproject and added a copy of the
same subfolder meta-myproject/recipes-core/psplash with ANOTHER header
file originating from ANOTHER image file. Also, I copied the
configuration file from meta-raspberry/conf to meta-myproject/conf (with
some minor adaptations) and added my new layer meta-myproject to the
bblayers-conf file in my main build folder.

Once running bitbake, I see that the psplash rules given in the
meta-raspberry layer causes a psplash-raspberry to be created. And due
to my new layer meta-myproject another version is created named
psplash-myproject. That all to be reviewd in tmp/work subfolder of my
build folder. So, that all worked out rather well.
If I afterwards run the step to create the root file system
(populate_rootfs), only the psplash-raspberry package seems to be
installed: There is only
/usr/bin/psplash-raspberry but there is no /usr/bin/psplash-myproject.

Copying the psplash-myproject binary to the raspberry manually and
setting up everything allows to display my image.

I also tried to deactivate the original recipe from
meta-raspberry/recipes-core/psplash by using BBMASK. This, however leads
to an error message during bitbake complaining that the RDEPENDENCY
psplash-raspberry can not be resoved.

So here are the questions:
1) Why my version of the psplash executable - even though it was built -
is not installed in the root fs?
2) I have been able to review the logs from build steps and almost
everything related to the package creation in tmp/work subfolder of my
build project. But how can I see which packages are installed during the
populate_rootfs step? There seems to be no dedicated log file.

I'd appreciate any assistance.

Thank you and best regards

Hauke

Re: Newbie Question regarding custom layer and populate_rootfs

[Stephan Roslen]

On Fr, 2016-05-20 at 08:44 +0200, public-hk@iks.rwth-aachen.de wrote:
> Hi all,
Hi Hauke,

nice to meet somebody familiar here. :)

> So here are the questions:
> 1) Why my version of the psplash executable - even though it was built -
> is not installed in the root fs?

Did you manually build your splash recipe (bitbake psplash-myproject)?
This does not include it in an image yet. It must be added to image
features either manually or through a dependency. 
The psplash-raspberry package seems to be included in the dependencies
here
https://git.yoctoproject.org/cgit/cgit.cgi/meta-raspberrypi/tree/conf/machine/include/rpi-base.inc#n51 - maybe there is a chance to override this in your local.conf
The cleanest way might be to include this in an own machine definition
and override it afterwards.

> 2) I have been able to review the logs from build steps and almost
> everything related to the package creation in tmp/work subfolder of my
> build project. But how can I see which packages are installed during the
> populate_rootfs step? There seems to be no dedicated log file.

There is a rather complex conglomerate of piped commands here, which
does this: https://community.freescale.com/docs/DOC-94953 

Regards,
Stephan

Re: Newbie Question regarding custom layer and populate_rootfs

[public-hk]

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Hi Stephan, hi Herrie,

thank you for your replies to my question.

>> So here are the questions:
>> 1) Why my version of the psplash executable - even though it was built -
>> is not installed in the root fs?
> Did you manually build your splash recipe (bitbake psplash-myproject)?
> This does not include it in an image yet. It must be added to image
> features either manually or through a dependency. 
> The psplash-raspberry package seems to be included in the dependencies
> here
> https://git.yoctoproject.org/cgit/cgit.cgi/meta-raspberrypi/tree/conf/machine/include/rpi-base.inc#n51 - maybe there is a chance to override this in your local.conf
> The cleanest way might be to include this in an own machine definition
> and override it afterwards.

I have finally added a machine raspberry2p which includes the original
raspberrypi2 machine definition - and then defines another SPLASH reference.
That worked.

>
>> 2) I have been able to review the logs from build steps and almost
>> everything related to the package creation in tmp/work subfolder of my
>> build project. But how can I see which packages are installed during the
>> populate_rootfs step? There seems to be no dedicated log file.
> There is a rather complex conglomerate of piped commands here, which
> does this: https://community.freescale.com/docs/DOC-94953 

What helped my a lot were the commands

bitbake-layers show-layers and
bitbake -g </image>/ && emacs pn-depends.dot

That reference is a really valuable link!

Thank you and best regards

Hauke


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