See: http://www.yoctoproject.org/docs/2.2/ref-manual/ref-manual.html#var-KERNEL_IMAGE_BASE_NAME

In the Morty/2.2 release, there were changes make to poky (kernel.bbclass), to KERNEL_IMAGE_BASE_NAME and the handling thereof, that don't match up with the reference guide for Morty. Specifically by KERNEL_IMAGE_BASE_NAME, but I'll let those more knowledgeable speak to greater impact of those changes (if there are any).

With commit 0437a59e3c29 ("kernel: Add KERNEL_IMAGETYPES to build multi types kernel at one time"), handling for building multiple kernel image types was added. This new feature effectively changed the definition and application of KERNEL_IMAGE_BASE_NAME (and at least one other var):

-KERNEL_IMAGE_BASE_NAME ?= "${KERNEL_IMAGETYPE}-${PKGE}-${PKGV}-${PKGR}-${MACHINE}-${DATETIME}"                                             
+KERNEL_IMAGE_BASE_NAME ?= "${PKGE}-${PKGV}-${PKGR}-${MACHINE}-${DATETIME}"

As of this change, the Morty documentation is no longer accurate for the variable.

I maintain a local bitbake recipe for the kernel, which copies the kernel config to DEPLOYDIR. My do_deploy changes, which had worked for krogoth, became problematic because of:

  KERNEL_IMAGE_BASE_NAME="-4.9-rc6+gitAUTOINC+<...snip...>"

instead of what I expected per the documentation, which ought to be:

  KERNEL_IMAGE_BASE_NAME="bzImage--4.9-rc6+gitAUTOINC+<...snip...>"

Inspecting the code, I do have a work-around. I had to re-use this pattern, adapted to my purposes:

<snip>
    install -m 0644 ${KERNEL_OUTPUT} ${DEPLOYDIR}/${KERNEL_IMAGE_BASE_NAME}.bin                                                         
    for type in ${KERNEL_IMAGETYPES} ; do                                                                                               
        base_name=${type}-${KERNEL_IMAGE_BASE_NAME}                                                                                 
        install -m 0644 ${KERNEL_OUTPUT_DIR}/${type} ${DEPLOYDIR}/${base_name}.bin                                                  
    done
</snip>