From cf2a5e0bb4c66e8c43caf9f1be93a1bd7fd07b17 Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Wed, 5 Oct 2016 18:18:19 +0100 Subject: [PATCH] MIPS: Support generating Flattened Image Trees (.itb) Add support for generating kernel images in the Flattened Image Tree (.itb) format as supported by U-Boot. This format is essentially a Flattened Device Tree binary containing images (kernels, DTBs, ramdisks) and configurations which link those images together. The big advantages of FIT images over the uImage format are: - We can include FDTs in the kernel image in a way that the bootloader can extract it & manipulate it before providing it to the kernel. Thus we can ship FDTs as part of the kernel giving us the advantages of being able to develop & maintain the DT within the kernel tree, but also have the benefits of the bootloader being able to manipulate the FDT. Example uses for this would be to inject the kernel command line into the chosen node, or to fill in the correct memory size. - We can include multiple configurations in a single kernel image. This means that a single FIT image can, given appropriate bootloaders, be booted on different boards with the bootloader selecting an appropriate configuration & providing the correct FDT to the kernel. - We can support a multitude of hashes over the data. Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/14352/ Signed-off-by: Ralf Baechle --- arch/mips/Makefile | 8 ++++++- arch/mips/boot/Makefile | 57 +++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 64 insertions(+), 1 deletion(-) diff --git a/arch/mips/Makefile b/arch/mips/Makefile index 598ab29..691a6e1 100644 --- a/arch/mips/Makefile +++ b/arch/mips/Makefile @@ -262,7 +262,8 @@ KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) KBUILD_CPPFLAGS += -DDATAOFFSET=$(if $(dataoffset-y),$(dataoffset-y),0) bootvars-y = VMLINUX_LOAD_ADDRESS=$(load-y) \ - VMLINUX_ENTRY_ADDRESS=$(entry-y) + VMLINUX_ENTRY_ADDRESS=$(entry-y) \ + PLATFORM=$(platform-y) LDFLAGS += -m $(ld-emul) @@ -302,6 +303,11 @@ boot-y += uImage.gz boot-y += uImage.lzma boot-y += uImage.lzo endif +boot-y += vmlinux.itb +boot-y += vmlinux.gz.itb +boot-y += vmlinux.bz2.itb +boot-y += vmlinux.lzma.itb +boot-y += vmlinux.lzo.itb # compressed boot image targets (arch/mips/boot/compressed/) bootz-y := vmlinuz diff --git a/arch/mips/boot/Makefile b/arch/mips/boot/Makefile index acb1988..ed65663 100644 --- a/arch/mips/boot/Makefile +++ b/arch/mips/boot/Makefile @@ -100,3 +100,60 @@ $(obj)/uImage.lzo: $(obj)/vmlinux.bin.lzo FORCE $(obj)/uImage: $(obj)/uImage.$(suffix-y) @ln -sf $(notdir $<) $@ @echo ' Image $@ is ready' + +# +# Flattened Image Tree (.itb) images +# + +targets += vmlinux.itb +targets += vmlinux.gz.itb +targets += vmlinux.bz2.itb +targets += vmlinux.lzma.itb +targets += vmlinux.lzo.itb + +quiet_cmd_cpp_its_S = ITS $@ + cmd_cpp_its_S = $(CPP) $(cpp_flags) -P -C -o $@ $< \ + -DKERNEL_NAME="\"Linux $(KERNELRELEASE)\"" \ + -DVMLINUX_BINARY="\"$(3)\"" \ + -DVMLINUX_COMPRESSION="\"$(2)\"" \ + -DVMLINUX_LOAD_ADDRESS=$(VMLINUX_LOAD_ADDRESS) \ + -DVMLINUX_ENTRY_ADDRESS=$(VMLINUX_ENTRY_ADDRESS) + +$(obj)/vmlinux.its: $(srctree)/arch/mips/$(PLATFORM)/vmlinux.its.S FORCE + $(call if_changed_dep,cpp_its_S,none,vmlinux.bin) + +$(obj)/vmlinux.gz.its: $(srctree)/arch/mips/$(PLATFORM)/vmlinux.its.S FORCE + $(call if_changed_dep,cpp_its_S,gzip,vmlinux.bin.gz) + +$(obj)/vmlinux.bz2.its: $(srctree)/arch/mips/$(PLATFORM)/vmlinux.its.S FORCE + $(call if_changed_dep,cpp_its_S,bzip2,vmlinux.bin.bz2) + +$(obj)/vmlinux.lzma.its: $(srctree)/arch/mips/$(PLATFORM)/vmlinux.its.S FORCE + $(call if_changed_dep,cpp_its_S,lzma,vmlinux.bin.lzma) + +$(obj)/vmlinux.lzo.its: $(srctree)/arch/mips/$(PLATFORM)/vmlinux.its.S FORCE + $(call if_changed_dep,cpp_its_S,lzo,vmlinux.bin.lzo) + +quiet_cmd_itb-image = ITB $@ + cmd_itb-image = \ + env PATH="$(objtree)/scripts/dtc:$(PATH)" \ + $(CONFIG_SHELL) $(MKIMAGE) \ + -D "-I dts -O dtb -p 500 \ + --include $(objtree)/arch/mips \ + --warning no-unit_address_vs_reg" \ + -f $(2) $@ + +$(obj)/vmlinux.itb: $(obj)/vmlinux.its $(obj)/vmlinux.bin FORCE + $(call if_changed,itb-image,$<) + +$(obj)/vmlinux.gz.itb: $(obj)/vmlinux.gz.its $(obj)/vmlinux.bin.gz FORCE + $(call if_changed,itb-image,$<) + +$(obj)/vmlinux.bz2.itb: $(obj)/vmlinux.bz2.its $(obj)/vmlinux.bin.bz2 FORCE + $(call if_changed,itb-image,$<) + +$(obj)/vmlinux.lzma.itb: $(obj)/vmlinux.lzma.its $(obj)/vmlinux.bin.lzma FORCE + $(call if_changed,itb-image,$<) + +$(obj)/vmlinux.lzo.itb: $(obj)/vmlinux.lzo.its $(obj)/vmlinux.bin.lzo FORCE + $(call if_changed,itb-image,$<) -- 2.7.4