126 lines
4.6 KiB
Makefile
126 lines
4.6 KiB
Makefile
#
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# barebox image generation Makefile
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#
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# This Makefile generates multiple images from a common barebox image
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# and different pbl (pre bootloader) images. Optionally the result is
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# encapsulated in SoC (or SoC boot type) specific image formats.
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#
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# The basic idea here is that we generate a single barebox main binary. This
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# is compressed and prepended with a self extractor, generated as barebox.x.
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# barebox.x is then prepended with different board specific pbls. The pbls
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# are generally named after their entrypoints. So a pcm038 specific pbl will
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# generate the following files:
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#
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# start_imx27_pcm038.pbl - The ELF file, linked with the entrypoint start_imx27_pcm038
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# start_imx27_pcm038.pblb - The raw binary of the above.
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# start_imx27_pcm038.pblx - The pblb appended with barebox.x
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# start_imx27_pcm038.pbl.map - The linker map file
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# start_imx27_pcm038.pbl.s - the disassembled ELF, generated with:
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# make images/start_imx27_pcm038.pbl.s
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#
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# Example Makefile snippets for the i.MX51 babbage board (for readability in opposite
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# order):
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#
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## image-$(CONFIG_MACH_FREESCALE_MX51_PDK) += barebox-imx51-babbage.img
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#
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# For CONFIG_MACH_FREESCALE_MX51_PDK build barebox-imx51-babbage.img
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#
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## FILE_barebox-imx51-babbage.img = start_imx51_babbage.pblx.imximg
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#
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# barebox-imx51-babbage.img should be generated (copied) from
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# start_imx51_babbage.pblx.imximg. This copy process is only done so that we
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# can generate images with a sane name. So what we really need for this
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# board is a i.MX specific image, a .imximg
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#
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## imximage-$(CONFIG_MACH_FREESCALE_MX51_PDK) += start_imx51_babbage.pblx.imximg
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## CFG_start_imx51_babbage.pblx.imximg = $(board)/freescale-mx51-pdk/flash-header.imxcfg
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#
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# The .imximg can be generated from a .pblx using a rule specified in Makefile.imx.
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# The configfile needed for this image is specified with CFG_<filename> = <configfile>
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#
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## pblx-$(CONFIG_MACH_FREESCALE_MX51_PDK) += start_imx51_babbage
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#
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# For this image we need a pblx (self extracting barebox binary) with
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# start_imx51_babbage as entrypoint. start_imx51_babbage will be used
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# both as entrypoint and as filename
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#
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quiet_cmd_objcopy_bin = OBJCOPYB $@
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cmd_objcopy_bin = $(OBJCOPY) -O binary $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
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pbl-lds := $(obj)/pbl.lds
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extra-y += $(pbl-lds)
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$(pbl-lds): $(obj)/../arch/$(ARCH)/lib/pbl.lds.S FORCE
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$(call if_changed_dep,cpp_lds_S)
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quiet_cmd_elf__ ?= LD $@
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cmd_elf__ ?= $(LD) $(LDFLAGS) -static --gc-sections -pie \
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-e $(2) -Map $@.map $(LDFLAGS_$(@F)) -o $@ \
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-T $(pbl-lds) \
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--start-group $(barebox-pbl-common) --end-group
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PBL_CPPFLAGS += -fdata-sections -ffunction-sections
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$(obj)/%.pbl: $(pbl-lds) $(barebox-pbl-common) FORCE
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$(call if_changed,elf__,$(*F))
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$(obj)/%.pblb: $(obj)/%.pbl FORCE
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$(call if_changed,objcopy_bin,$(*F))
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quiet_cmd_pblx ?= PBLX $@
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cmd_pblx ?= cat $(obj)/$(patsubst %.pblx,%.pblb,$(2)) > $@; \
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$(call size_append, $(obj)/barebox.x) >> $@; \
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cat $(obj)/barebox.x >> $@
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$(obj)/%.pblx: $(obj)/%.pblb $(obj)/barebox.x FORCE
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$(call if_changed,pblx,$(@F))
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$(obj)/%.s: $(obj)/% FORCE
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$(call if_changed,disasm)
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suffix_$(CONFIG_IMAGE_COMPRESSION_GZIP) = gzip
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suffix_$(CONFIG_IMAGE_COMPRESSION_LZO) = lzo
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suffix_$(CONFIG_IMAGE_COMPRESSION_LZ4) = lz4
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suffix_$(CONFIG_IMAGE_COMPRESSION_NONE) = shipped
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# barebox.z - compressed barebox binary
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# ----------------------------------------------------------------
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$(obj)/barebox.z: $(obj)/../barebox.bin FORCE
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$(call if_changed,$(suffix_y))
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quiet_cmd_selfextract = COMP $@
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cmd_selfextract = cat $(obj)/start_uncompress.pblb > $@; \
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$(call size_append, $<) >> $@; \
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cat $< >> $@
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pblx-y += start_uncompress
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# barebox.x - self extracting barebox binary
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# ----------------------------------------------------------------
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$(obj)/barebox.x: $(obj)/barebox.z $(obj)/start_uncompress.pblb FORCE
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$(call if_changed,selfextract)
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# %.img - create a copy from another file
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# ----------------------------------------------------------------
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.SECONDEXPANSION:
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$(obj)/%.img: $(obj)/$$(FILE_$$(@F))
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$(Q)if [ -z $(FILE_$(@F)) ]; then echo "FILE_$(@F) empty!"; false; fi
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$(call if_changed,shipped)
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include $(srctree)/images/Makefile.imx
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targets += $(image-y) pbl.lds barebox.x barebox.z
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targets += $(patsubst %,%.pblx,$(pblx-y))
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targets += $(patsubst %,%.pblb,$(pblx-y))
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targets += $(patsubst %,%.pbl,$(pblx-y))
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targets += $(patsubst %,%.s,$(pblx-y))
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targets += $(imximage-y)
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SECONDARY: $(addprefix $(obj)/,$(targets))
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images: $(addprefix $(obj)/, $(image-y)) FORCE
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@echo "images built:\n" $(patsubst %,%\\n,$(image-y))
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clean-files := *.pbl *.pblb *.pblx *.map start_*.imximg *.img barebox.z
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clean-files += pbl.lds
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