OtavioSalvador wrote:
Changing the recipe is not the best alternative; the best way is you to create an image specific for your needs and add the packages you need.
Which brings us back to my earlier lament about Yocto being about as clear and intelligible as the Voynich Manuscript. "Obviously" you would want to create your own layer and image recipe(s). What's not at all obvious is how to do that. It's taken me over three weeks of constantly staring at this gobbledegook to achieve even basic competence. I2C devices? SPI devices? Setting up an Agilent logic analyzer? Pfah! the work of merest trivia. But this Yocto stuff is just line noise...
...Blergh. That having been said:
In my case, I'm setting up a layer for our board. Right now it targets the SABRE-SD board, but will evolve to cover our Shiny New Thing(TM). To that end, I created a new layer using the command 'yocto-layer create <layer_name>'. It will ask you a series of questions; the defaults are probably okay. This command just creates a layer directory; it makes no other changes to your environment (so if you mess it up, you can just delete the directory and start over). When the command completes, you will have a layer directory that contains nothing but scaffolding (i.e. it doesn't do anything yet).
At this point, you're pretty much resigned to copy-pasting other files from the Yocto distribution into your new layer and modifying them. In my case, I copied the recipe for the core-image-minimal target into my layer and started hacking on it. Assuming your new layer is named meta-belis3:
mkdir -p sources/meta-belis3/recipes-core/images
cp sources/poky/meta/recipes-core/images/core-image-minimal.bb sources/meta-belis3/recipes-core/images/foobar.bb
At this point, load the newly copied foobar.bb into your favorite editor and start hacking on it. Almost certainly you'll be adding packages to the IMAGE_INSTALL variable.
Once you're ready to try something, go into your build directory. Edit the conf/bblayers.conf file to include your newly-created layer, along these lines:
BBLAYERS = " \
${BSPDIR}/sources/poky/meta \
[ ...blah, blah, blah... ]
${BSPDIR}/sources/meta-fsl-demos \
${BSPDIR}/sources/meta-belis3 \ # <-- Your new layer appended here.
"
Now the bitbake tool can see your new layer. Now tell bitbake to process your new build recipe:
$ bitbake foobar
At this point, something will happen. If you're very lucky, it will be what you wanted to happen.
Wish I could offer deeper, more meaningful insight, but this is about as much understanding as I've managed to acquire so far.
