Yocto Bitbake doesn't include kernel config fragment in build

Question

I am currently trying to setup docker on my yocto (thud - 2.6) project. For that, I need to enable some kernel configuration.

The problem is that the kernel config fragment is not included in the build.

To include the config fragment I created a custom layer with the following structure

meta-edge_controller
|__conf
|   |__layer.conf
|__recipes-kernel
    |__linux
        |__linux-intel
        |   |__docker_required.cfg
        |__linux-intel_4.14.bbappend  

linux-intel_4.14.bbappend

FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
SRC_URL += "file://docker_required.cfg"

docker_required.cfg

CONFIG_CGROUP_DEVICE=y
CONFIG_IP_MULTICAST=y
CONFIG_IP_ADVANCED_ROUTER=y
CONFIG_NETFILTER=y
CONFIG_NF_CONNTRACK=y
CONFIG_NF_TABLES=y
CONFIG_NF_NAT=y
CONFIG_NETFILTER_XT_MATCH_ADDRTYPE=y
CONFIG_NETFILTER_XT_MATCH_COMMENT=y
CONFIG_NETFILTER_XT_MATCH_HL=y
CONFIG_NETFILTER_XT_MATCH_IPRANGE=y
CONFIG_NETFILTER_XT_MATCH_LIMIT=y
CONFIG_NETFILTER_XT_MATCH_MULTIPORT=y
CONFIG_NETFILTER_XT_MATCH_RECENT=y
CONFIG_IP_VS=y
CONFIG_NF_TABLES_IPV4=y
CONFIG_IP_NF_IPTABLES=y
CONFIG_IP_NF_NAT=y
CONFIG_IP_NF_FILTER=y
CONFIG_IP_NF_MANGLE=y
CONFIG_IP6_NF_IPTABLES=y
CONFIG_IP6_NF_FILTER=y
CONFIG_IP6_NF_MANGLE=y
CONFIG_BTRFS_FS=y
CONFIG_OVERLAY_FS=y

I am builing for an Intel based Board (Atom E3940) and I have integrated the meta-intel layer, using the machine type "intel-corei7-64".

How can I further debug or investigate why bitbake doesn't include the kernel config fragment?

I also tried rebuilding the kernel manually: bitbake -c cleanall linux-intel and bitbake linux-intel

Answer 1

I see a typo in your snippet. SRC_URL should be SRC_URI instead. More info here.