kernel: Build uImage only when really needed

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@denx.de>
Cc: Richard Purdie <richard.purdie@linuxfoundation.org>
Cc: Koen Kooi <koen@dominion.thruhere.net>
Cc: Paul Eggleton <paul.eggleton@linux.intel.com>
Cc: Ross Burton <ross.burton@intel.com>
Cc: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/meta/classes/kernel-uimage.bbclass b/meta/classes/kernel-uimage.bbclass
index ce8f96f65b..f73965b13f 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 .
+	if d.getVar("KEEPUIMAGE", True) != 'yes':
+            d.setVar("KERNEL_IMAGETYPE_FOR_MAKE", "zImage")
 }
 
 do_uboot_mkimage() {