ARM: add config option to build zImage/dtb combo

Allows a defconfig to set a default dtb to concatenate with a zImage
to create a zImage-dtb.<dtb name>

Signed-off-by: Erik Gilling <konkers@android.com>
Change-Id: I34b643b1c49228fbae88a56e46c93c478089620d

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 88a56444749a61f0a120f13519e77ab7e401f70e..7ccb0fedf443c1bc820e6ccbe6100bd7fa8cced8 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1853,6 +1853,21 @@ config DEPRECATED_PARAM_STRUCT
          This was deprecated in 2001 and announced to live on for 5 years.
          Some old boot loaders still use this way.
 
+config BUILD_ARM_APPENDED_DTB_IMAGE
+       bool "Build a concatenated zImage/dtb by default"
+       depends on OF
+       help
+         Enabling this option will cause a concatenated zImage and DTB to
+         be built by default (instead of a standalone zImage.)  The image
+         will built in arch/arm/boot/zImage-dtb.<dtb name>
+
+config BUILD_ARM_APPENDED_DTB_IMAGE_NAME
+       string "Default dtb name"
+       depends on BUILD_ARM_APPENDED_DTB_IMAGE
+       help
+         name of the dtb to append when building a concatenated
+         zImage/dtb.
+
 # Compressed boot loader in ROM.  Yes, we really want to ask about
 # TEXT and BSS so we preserve their values in the config files.
 config ZBOOT_ROM_TEXT

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 2c2b28ee48119771dfa92f353124795d456d770a..0ec5ca6d93813bd3360dbf06616177b88309be74 100644 (file)
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -296,6 +296,8 @@ libs-y                              := arch/arm/lib/ $(libs-y)
 # Default target when executing plain make
 ifeq ($(CONFIG_XIP_KERNEL),y)
 KBUILD_IMAGE := xipImage
+else ifeq ($(CONFIG_BUILD_ARM_APPENDED_DTB_IMAGE),y)
+KBUILD_IMAGE := zImage-dtb.$(CONFIG_BUILD_ARM_APPENDED_DTB_IMAGE_NAME)
 else
 KBUILD_IMAGE := zImage
 endif