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

[Bruce Ashfield]

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).

Bruce

> +	if d.getVar("KEEPUIMAGE", True) == 'yes':
> +            d.setVar("KERNEL_IMAGETYPE_FOR_MAKE", "zImage")
>   }
>
>   do_uboot_mkimage() {
>