uboot: Introduce BR2_TARGET_UBOOT_FORMAT_DTB_IMX

Some i.MX boards which use device tree to describe the hardware
for U-Boot generate a u-boot-dtb.imx binary.

Introduce the BR2_TARGET_UBOOT_FORMAT_DTB_IMX option to
handle such case.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

boot/uboot/Config.in

@@ -190,6 +190,9 @@ config BR2_TARGET_UBOOT_FORMAT_DTB_BIN
 config BR2_TARGET_UBOOT_FORMAT_DTB_IMG
 	bool "u-boot-dtb.img"
 
+config BR2_TARGET_UBOOT_FORMAT_DTB_IMX
+	bool "u-boot-dtb.imx"
+
 config BR2_TARGET_UBOOT_FORMAT_IMG
 	bool "u-boot.img"
 

boot/uboot/uboot.mk

@@ -70,6 +70,11 @@ UBOOT_BINS += u-boot-dtb.img
 UBOOT_MAKE_TARGET += u-boot-dtb.img
 endif
 
+ifeq ($(BR2_TARGET_UBOOT_FORMAT_DTB_IMX),y)
+UBOOT_BINS += u-boot-dtb.imx
+UBOOT_MAKE_TARGET += u-boot-dtb.imx
+endif
+
 ifeq ($(BR2_TARGET_UBOOT_FORMAT_DTB_BIN),y)
 UBOOT_BINS += u-boot-dtb.bin
 UBOOT_MAKE_TARGET += u-boot-dtb.bin