I’m trying to write a meta laterfor scarthgap and build only the kernel for a custom board.

I have added all the configurations but it seems efi causes some erros in build despite following the documentation.

conf/machine/custom.conf

...
...
MACHINE_FEATURES = "acpi alsa bluetooth efi keyboard pci qemu-usermode rtc screen usbhost vfat wifi opengles opencl hwh264dec hwh264enc"

...
...
EFI_PROVIDER ?= "${@bb.utils.contains("DISTRO_FEATURES", "systemd", "systemd-boot", "grub-efi", d)}"
...
...

The build causes:

MACHINE=custom bitbake linux-yocto
...

ERROR: linux-yocto-5.10.184+git-r0 do_kernel_metadata: Feature 'cfg/efi.scc' not found, this will cause configuration failures.
ERROR: linux-yocto-5.10.184+git-r0 do_kernel_metadata: Check the SRC_URI for meta-data repositories or directories that may be missing
ERROR: linux-yocto-5.10.184+git-r0 do_kernel_metadata: Set KERNEL_DANGLING_FEATURES_WARN_ONLY to ignore this issue
ERROR: linux-yocto-5.10.184+git-r0 do_kernel_metadata: ExecutionError('/home/user1/workspace/yocto-scarthgap-5.0/build/tmp/work/custom-poky-linux/linux-yocto/5.10.184+git/temp/run.do_kernel_metadata.2434247', 1, None, None)
ERROR: Logfile of failure stored in: /home/user1/workspace/yocto-scarthgap-5.0/build/tmp/work/custom-poky-linux/linux-yocto/5.10.184+git/temp/log.do_kernel_metadata.2434247
...

Why is this happening? I do not find any file named efi.scc in poky:

user1@PC-1:~/workspace/yocto-scarthgap-5.0/poky$ find . -name efi.scc
user1@PC-1:~/workspace/yocto-scarthgap-5.0/poky$ 

user1@PC-1:~/workspace/yocto-scarthgap-5.0/poky$ grep -nri efi.scc
documentation/kernel-dev/advanced.rst:572:   include cfg/efi.scc
meta/recipes-kernel/linux/linux-yocto.inc:36:KERNEL_FEATURES:append = " ${@bb.utils.contains('MACHINE_FEATURES', 'efi', 'cfg/efi.scc', '', d)}"

How is this supposed to work? Is poky feature itself broken?