Support for "cpio.gz" (which is the one we want to use) missing as valid parameter to "--enable-bootimage" option to WRLinux5 "configure" command.
Add IMAGE_FSTYPES += "cpio cpio.gz" in wrlinux-image-glibc-std.bbappend or wrlinux-image-glibc-small.bbappend or for whatever filesystem you are using...
Support for "cpio.gz" missing as valid parameter to "--enable-bootimage" option to WRLinux5 "configure" command.