meta-kernel is used by meta-arm for some BSPs. However, in some configurations every recipe in the layer will be skipped, so the BBFILE_PATTERN test fails: WARNING: No bb files in default matched BBFILE_PATTERN_meta-kernel '^/home/ross/Yocto/meta-kernel/' All of the kernels were skipped: linux-stable was skipped: PREFERRED_PROVIDER_virtual/kernel set to linux-yocto, not linux-stable And the one other recipe is rpi-specific. By dumping the contents of pkg_fn it is clear that skipped recipes are removed from that list.
http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=0aff94023f931a84d21069d92522e0f5338f09a4