recipes-bsp/u-boot: Allow deploying the u-boot DTB

Use ??= assignment for UBOOT_DTB_BINARY because it is set using ?= in
fitImage bbclass as well, using ?= will preempt that

(From OE-Core rev: efe9f33beb053c8d645bfa5791846ffaa3cbceb4)

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/meta/classes/uboot-config.bbclass b/meta/classes/uboot-config.bbclass
index 3bba02828b..451db0c650 100644
--- a/meta/classes/uboot-config.bbclass
+++ b/meta/classes/uboot-config.bbclass
@@ -71,6 +71,10 @@ UBOOT_MKIMAGE_SIGN ?= "${UBOOT_MKIMAGE}"
 UBOOT_MKIMAGE_SIGN_ARGS ?= ""
 SPL_MKIMAGE_SIGN_ARGS ?= ""
 
+# Options to deploy the u-boot device tree
+UBOOT_DTB ?= ""
+UBOOT_DTB_BINARY ??= ""
+
 python () {
     ubootmachine = d.getVar("UBOOT_MACHINE")
     ubootconfigflags = d.getVarFlags('UBOOT_CONFIG')