[OE-core] [PATCH 4/8] kernel: Pull uImage generation into separate class

[Marek Vasut]

On Tuesday, April 28, 2015 at 11:16:17 PM, Marek Vasut wrote:
> On Tuesday, April 28, 2015 at 08:44:54 PM, Bruce Ashfield wrote:
> > On 2015-04-28 12:38 PM, Marek Vasut wrote:
> > > Pull the uImage image format generation from kernel.bbclass into
> > > a separate kernel-uimage.bbclass. The recipes which now need to
> > > generate an uImage will have to inherit kernel-uimage instead of
> > > kernel class.
> > > 
> > > Signed-off-by: Marek Vasut <marex at denx.de>
> > > Cc: Richard Purdie <richard.purdie at linuxfoundation.org>
> > > Cc: Koen Kooi <koen at dominion.thruhere.net>
> > > Cc: Paul Eggleton <paul.eggleton at linux.intel.com>
> > > Cc: Ross Burton <ross.burton at intel.com>
> > > Cc: Bruce Ashfield <bruce.ashfield at windriver.com>
> > > ---
> > > 
> > >   meta/classes/kernel-uimage.bbclass | 48
> > >   +++++++++++++++++++++++++++++++++ meta/classes/kernel.bbclass       
> > >   | 55 +++++++------------------------------- 2 files changed, 58
> > >   insertions(+), 45 deletions(-)
> > >   create mode 100644 meta/classes/kernel-uimage.bbclass
> > > 
> > > NOTE: The "inherit kernel-uimage" in kernel.bbclass should be changed
> > > to
> > > 
> > >        something like "inherit kernel-${@d.getVar("KERNEL_IMAGETYPE",
> > >        True).lower()}" but the problem is that I only want to perform
> > >        the inheritance for uimage and fitimage, the other image types
> > >        don't need to inherit any additional special stuff.
> > >        Paul suggested I can do "inherit <empty here>". This would at
> > >        least let me implement a python function which returns either
> > >        "kernel-uimage", "kernel-fitimage" or "" and based on that, I
> > >        could inherit the particular image type specifics into
> > >        kernel.bbclass.
> > >        What I don't know how to implement well is this function which
> > >        returns those three strings based on the KERNEL_IMAGETYPE. What
> > >        I would like to avoid is encoding those strings explicitly into
> > >        the function, since that would force each new kernel image
> > >        format to also edit this function in kernel.bbclass .
> > >        Apparently, checking whether class exists and inheriting it
> > >        only if it does is also not a simple task.
> > 
> > Agreed that this would be better. It would remove a lot of the checks
> > in the other tasks for the image type.
> 
> Hi!
> 
> Yes, that's indeed true. All the image type checks would disappear from
> kernel-uimage and kernel-fitimage bbclasses.
> 
> > I'm not aware of the exact details on how to make this work, but
> > hopefully others have the foo.

Any ideas please ?

Best regards,
Marek Vasut