5.12.4. Set Up Your Layer for the Build

These steps get your layer set up for the build:

  1. Create additional structure: Create the additional layer structure:

         $ cd ~/poky/meta-mylayer
         $ mkdir conf
         $ mkdir recipes-kernel
         $ mkdir recipes-kernel/linux
         $ mkdir recipes-kernel/linux/linux-yocto
                             

    The conf directory holds your configuration files, while the recipes-kernel directory holds your append file and your patch file.

  2. Create the layer configuration file: Move to the meta-mylayer/conf directory and create the layer.conf file as follows:

         # We have a conf and classes directory, add to BBPATH
         BBPATH .= ":${LAYERDIR}"
    
         # We have recipes-* directories, add to BBFILES
         BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
                     ${LAYERDIR}/recipes-*/*/*.bbappend"
    
         BBFILE_COLLECTIONS += "mylayer"
         BBFILE_PATTERN_mylayer = "^${LAYERDIR}/"
         BBFILE_PRIORITY_mylayer = "5"
                             

    Notice mylayer as part of the last three statements.

  3. Create the kernel recipe append file: Move to the meta-mylayer/recipes-kernel/linux directory and create the linux-yocto_3.4.bbappend file as follows:

         FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
    
         SRC_URI += "file://0001-calibrate-Add-printk-example.patch"
                            

    The FILESEXTRAPATHS and SRC_URI statements enable the OpenEmbedded build system to find the patch file. For more information on using append files, see the "Using .bbappend Files in Your Layer" section.

  4. Put the patch file in your layer: Move the 0001-calibrate-Add-printk-example.patch file to the meta-mylayer/recipes-kernel/linux/linux-yocto directory.