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

[Andre McCurdy]

On Tue, Mar 28, 2017 at 7:19 AM, Robert P. J. Day <rpjday at crashcourse.ca> wrote:
>
>   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?

KERNEL_IMAGETYPE is the legacy variable and it's added to
KERNEL_IMAGETYPES for backwards compatibility.

If you update your machine config and local.conf over-rides etc to all
consistently use KERNEL_IMAGETYPES then the behaviour should be closer
to what you expect.

> rday
>
> --
>
> ========================================================================
> 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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