[U-Boot] [PATCH 12/17] Makefile: add rules to generate SPL FIT images

[Andrew F. Davis <afd@ti.com>]

On 02/28/2017 08:25 PM, Andre Przywara wrote:
> Some platforms require more complex U-Boot images than we can easily
> generate via the mkimage command line, for instance to load additional
> image files.
> Introduce a CONFIG_SPL_FIT_SOURCE and CONFIG_SPL_FIT_GENERATOR symbol,
> which can either hold an .its source file describing the image layout,
> or, in the second case, a generator tool (script) to create such
> a source file. This script gets passed the list of device tree files
> from the CONFIG_OF_LIST variable.
> A platform or board can define either of those in their defconfig file
> to allow an easy building of such an image.
> 
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---

Acked-by: Andrew F. Davis <afd@ti.com>

>  Kconfig  | 17 +++++++++++++++++
>  Makefile | 20 ++++++++++++++++++++
>  2 files changed, 37 insertions(+)
> 
> diff --git a/Kconfig b/Kconfig
> index 81b4226..f3e4243 100644
> --- a/Kconfig
> +++ b/Kconfig
> @@ -238,6 +238,23 @@ config SPL_FIT_IMAGE_POST_PROCESS
>  	  injected into the FIT creation (i.e. the blobs would have been pre-
>  	  processed before being added to the FIT image).
>  
> +config SPL_FIT_SOURCE
> +	string ".its source file for U-Boot FIT image"
> +	depends on SPL_FIT
> +	help
> +	  Specifies a (platform specific) FIT source file to generate the
> +	  U-Boot FIT image. This could specify further image to load and/or
> +	  execute.
> +
> +config SPL_FIT_GENERATOR
> +	string ".its file generator script for U-Boot FIT image"
> +	depends on SPL_FIT
> +	help
> +	  Specifies a (platform specific) script file to generate the FIT
> +	  source file used to build the U-Boot FIT image file. This gets
> +	  passed a list of supported device tree file stub names to
> +	  include in the generated image.
> +
>  endif # FIT
>  
>  config OF_BOARD_SETUP
> diff --git a/Makefile b/Makefile
> index 38b42da..e09b0d9 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -826,6 +826,10 @@ quiet_cmd_mkimage = MKIMAGE $@
>  cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \
>  	$(if $(KBUILD_VERBOSE:1=), >$(MKIMAGEOUTPUT))
>  
> +quiet_cmd_mkfitimage = MKIMAGE $@
> +cmd_mkfitimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -f $(U_BOOT_ITS) -E $@ \
> +	$(if $(KBUILD_VERBOSE:1=), >$(MKIMAGEOUTPUT))
> +
>  quiet_cmd_cat = CAT     $@
>  cmd_cat = cat $(filter-out $(PHONY), $^) > $@
>  
> @@ -945,6 +949,19 @@ quiet_cmd_cpp_cfg = CFG     $@
>  cmd_cpp_cfg = $(CPP) -Wp,-MD,$(depfile) $(cpp_flags) $(LDPPFLAGS) -ansi \
>  	-DDO_DEPS_ONLY -D__ASSEMBLY__ -x assembler-with-cpp -P -dM -E -o $@ $<
>  
> +# Boards with more complex image requirments can provide an .its source file
> +# or a generator script
> +ifneq ($(CONFIG_SPL_FIT_SOURCE),"")
> +U_BOOT_ITS = $(subst ",,$(CONFIG_SPL_FIT_SOURCE))
> +else
> +ifneq ($(CONFIG_SPL_FIT_GENERATOR),"")
> +U_BOOT_ITS := u-boot.its
> +$(U_BOOT_ITS): FORCE
> +	$(srctree)/$(CONFIG_SPL_FIT_GENERATOR) \
> +	$(patsubst %,arch/$(ARCH)/dts/%.dtb,$(subst ",,$(CONFIG_OF_LIST))) > $@
> +endif
> +endif
> +
>  ifdef CONFIG_SPL_LOAD_FIT
>  MKIMAGEFLAGS_u-boot.img = -f auto -A $(ARCH) -T firmware -C none -O u-boot \
>  	-a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_UBOOT_START) \
> @@ -977,6 +994,9 @@ u-boot-dtb.img u-boot.img u-boot.kwb u-boot.pbl u-boot-ivt.img: \
>  		$(if $(CONFIG_SPL_LOAD_FIT),u-boot-nodtb.bin dts/dt.dtb,u-boot.bin) FORCE
>  	$(call if_changed,mkimage)
>  
> +u-boot.itb: u-boot-nodtb.bin dts/dt.dtb $(U_BOOT_ITS) FORCE
> +	$(call if_changed,mkfitimage)
> +
>  u-boot-spl.kwb: u-boot.img spl/u-boot-spl.bin FORCE
>  	$(call if_changed,mkimage)
>  
>