[OE-core] how to specify *just* the KERNEL_IMAGETYPES i want?

[Robert P. J. Day]

  playing with building fit images, and i started with mpc8315e-rdb,
built virtual/kernel using all defaults, and got this in images/:

modules--4.9.8+git0+b65e9b6153_6b67f448d6-r0-mpc8315e-rdb-20170315095945.tgz
uImage--4.9.8+git0+b65e9b6153_6b67f448d6-r0-mpc8315e-rdb-20170315095945.bin
uImage--4.9.8+git0+b65e9b6153_6b67f448d6-r0-mpc8315erdb-20170315095945.dtb

which is perfectly fine, since the machine conf file for that target
includes the line:

  KERNEL_IMAGETYPE = "uImage"

now i start another (fresh) build, and add to local.conf the lines:

  KERNEL_CLASSES = "kernel-fitimage"
  KERNEL_IMAGETYPES = "fitImage"

now my use of the above is my (alleged) way of saying, "i only want a
fitImage", but given this snippet from kernel.bbclass:

    # Merge KERNEL_IMAGETYPE and KERNEL_ALT_IMAGETYPE into KERNEL_IMAGETYPES
    type = d.getVar('KERNEL_IMAGETYPE') or ""
    alttype = d.getVar('KERNEL_ALT_IMAGETYPE') or ""
    types = d.getVar('KERNEL_IMAGETYPES') or ""
    if type not in types.split():
        types = (type + ' ' + types).strip()

i apparently get both the default as specified in the machine .conf
file, *as well as* the fitImage i ask for. and, sure enough, in my
images/ directory, i have uImages and fitImages (and zImages, but i
believe that's because fitImages require them, so no big deal).

  i suspect i could prevent the generation of uImages by using:

  KERNEL_IMAGETYPE_mpc8315e-rdb = "fitImage"

but from a clarity point of view, would it not make more sense that if
someone had a line:

  KERNEL_IMAGETYPES = " ... list of types ..."

that should override whatever KERNEL_IMAGETYPE is in the machine conf
file and generate *just* those images? or am i missing something here?

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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