kernel: fitimage: support device tree compiler options

This introduces a new variable to set the device tree compiler options while
calling mkimage ('-D' option). By default, this variable is not set but it can
be defined in a configuration file, as following example:

UBOOT_MKIMAGE_DTCOPTS = "-I dts -O dtb -p 2000"

(From OE-Core rev: 9a3f541da305c75418c2eec75ade902717a01b69)

Signed-off-by: Yannick Gicquel <yannick.gicquel@iot.bzh>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/meta/classes/kernel-fitimage.bbclass b/meta/classes/kernel-fitimage.bbclass
index e5b75edf5b..62e0017617 100644
--- a/meta/classes/kernel-fitimage.bbclass
+++ b/meta/classes/kernel-fitimage.bbclass
@@ -17,6 +17,9 @@ python __anonymous () {
             d.appendVarFlag('do_assemble_fitimage', 'depends', ' ${INITRAMFS_IMAGE}:do_image_complete')
 }
 
+# Options for the device tree compiler passed to mkimage '-D' feature:
+UBOOT_MKIMAGE_DTCOPTS ??= ""
+
 #
 # Emit the fitImage ITS header
 #
@@ -209,7 +212,10 @@ do_assemble_fitimage() {
                 #
                 # Step 4: Assemble the image
                 #
-                uboot-mkimage -f fit-image.its arch/${ARCH}/boot/fitImage
+                uboot-mkimage \
+                        ${@'-D "${UBOOT_MKIMAGE_DTCOPTS}"' if len('${UBOOT_MKIMAGE_DTCOPTS}') else ''} \
+                        -f fit-image.its \
+                        arch/${ARCH}/boot/fitImage
         fi
 }