[OE-core] [PATCH 8/8] kernel: Build uImage only when really needed

[Marek Vasut]

On Tuesday, April 28, 2015 at 08:43:48 PM, Bruce Ashfield wrote:
> On 2015-04-28 12:38 PM, Marek Vasut wrote:
> > Build the uImage file using the kernel build system only when
> > it is really required, which is only in case KEEPUIMAGE == yes.
> > Otherwise, just build zImage, since the Yocto build system will
> > handle the uImage generation for us.
> > 
> > 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 | 8 ++++++++
> >   1 file changed, 8 insertions(+)
> > 
> > diff --git a/meta/classes/kernel-uimage.bbclass
> > b/meta/classes/kernel-uimage.bbclass index ce8f96f..acde9ae 100644
> > --- a/meta/classes/kernel-uimage.bbclass
> > +++ b/meta/classes/kernel-uimage.bbclass
> > @@ -6,6 +6,14 @@ python __anonymous () {
> > 
> >           depends = d.getVar("DEPENDS", True)
> >           depends = "%s u-boot-mkimage-native" % depends
> >           d.setVar("DEPENDS", depends)
> > 
> > +
> > +	# Override KERNEL_IMAGETYPE_FOR_MAKE variable, which is internal
> > +	# to kernel.bbclass . We override the variable here, since we need
> > +	# to build uImage using the kernel build system if and only if
> > +	# KEEPUIMAGE != yes. Otherwise, we pack compressed vmlinux into
> > +	# the uImage .
> 
> I keep reading this, and must be inverting the logic in my head.
> 
> If we've set KEEPUIMAGE = yes, that means we just want to let the
> kernel build the uImage and perform no extra generation steps.
> 
> When I read this, it looks like if I set the keep flag, I'll be
> overriden to build a zImage. Is that intentional ? I'd think we
> would have just left it alone or set it to uImage (unless we
> are saying that everyone should be building zImage now .. but
> I know some old ppc targets that do want to build uImages).

Uhhh, you're obviously right. The logic in the __anonymous function is
clearly inverted. Thanks for spotting this!

Best regards,
Marek Vasut