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- # Makefile for making ELF bootable images for booting on CHRP
- # using Open Firmware.
- #
- # Geert Uytterhoeven September 1997
- #
- # Based on coffboot by Paul Mackerras
- # Simplified for ppc64 by Todd Inglett
- #
- # NOTE: this code is built for 32 bit in ELF32 format even though
- # it packages a 64 bit kernel. We do this to simplify the
- # bootloader and increase compatibility with OpenFirmware.
- #
- # To this end we need to define BOOTCC, etc, as the tools
- # needed to build the 32 bit image. These are normally HOSTCC,
- # but may be a third compiler if, for example, you are cross
- # compiling from an intel box. Once the 64bit ppc gcc is
- # stable it will probably simply be a compiler switch to
- # compile for 32bit mode.
- # To make it easier to setup a cross compiler,
- # CROSS32_COMPILE is setup as a prefix just like CROSS_COMPILE
- # in the toplevel makefile.
- HOSTCC := gcc
- BOOTCFLAGS := $(HOSTCFLAGS) -fno-builtin -nostdinc -isystem $(shell $(CROSS32CC) -print-file-name=include)
- BOOTAFLAGS := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
- BOOTLFLAGS := -Ttext 0x00400000 -e _start -T $(srctree)/$(src)/zImage.lds
- OBJCOPYFLAGS := contents,alloc,load,readonly,data
- src-boot := crt0.S string.S prom.c main.c zlib.c imagesize.c div64.S
- src-boot := $(addprefix $(obj)/, $(src-boot))
- obj-boot := $(addsuffix .o, $(basename $(src-boot)))
- quiet_cmd_bootcc = BOOTCC $@
- cmd_bootcc = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $<
- quiet_cmd_bootas = BOOTAS $@
- cmd_bootas = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTAFLAGS) -c -o $@ $<
- quiet_cmd_bootld = BOOTLD $@
- cmd_bootld = $(CROSS32LD) $(BOOTLFLAGS) -o $@ $(2)
- $(patsubst %.c,%.o, $(filter %.c, $(src-boot))): %.o: %.c
- $(call if_changed_dep,bootcc)
- $(patsubst %.S,%.o, $(filter %.S, $(src-boot))): %.o: %.S
- $(call if_changed_dep,bootas)
- #-----------------------------------------------------------
- # ELF sections within the zImage bootloader/wrapper
- #-----------------------------------------------------------
- required := vmlinux.strip
- initrd := initrd
- obj-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.o, $(section)))
- src-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.c, $(section)))
- gz-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.gz, $(section)))
- hostprogs-y := addnote addRamDisk
- targets += zImage.vmode zImage.initrd.vmode zImage zImage.initrd imagesize.c \
- $(patsubst $(obj)/%,%, $(call obj-sec, $(required) $(initrd))) \
- $(patsubst $(obj)/%,%, $(call src-sec, $(required) $(initrd))) \
- $(patsubst $(obj)/%,%, $(call gz-sec, $(required) $(initrd))) \
- vmlinux.initrd
- extra-y := initrd.o
- quiet_cmd_ramdisk = RAMDISK $@
- cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@
- quiet_cmd_stripvm = STRIP $@
- cmd_stripvm = $(STRIP) -s $< -o $@
- vmlinux.strip: vmlinux FORCE
- $(call if_changed,stripvm)
- $(obj)/vmlinux.initrd: vmlinux.strip $(obj)/addRamDisk $(obj)/ramdisk.image.gz FORCE
- $(call if_changed,ramdisk)
- quiet_cmd_addsection = ADDSEC $@
- cmd_addsection = $(CROSS32OBJCOPY) $@ \
- --add-section=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $@))=$(patsubst %.o,%.gz, $@) \
- --set-section-flags=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $@))=$(OBJCOPYFLAGS)
- quiet_cmd_imagesize = GENSIZE $@
- cmd_imagesize = ls -l vmlinux.strip | \
- awk '{printf "/* generated -- do not edit! */\n" "unsigned long vmlinux_filesize = %d;\n", $$5}' \
- > $(obj)/imagesize.c && \
- $(CROSS_COMPILE)nm -n vmlinux | tail -n 1 | \
- awk '{printf "unsigned long vmlinux_memsize = 0x%s;\n", substr($$1,8)}' >> $(obj)/imagesize.c
- quiet_cmd_addnote = ADDNOTE $@
- cmd_addnote = $(obj)/addnote $@
- $(call gz-sec, $(required)): $(obj)/kernel-%.gz: % FORCE
- $(call if_changed,gzip)
- $(obj)/kernel-initrd.gz: $(obj)/ramdisk.image.gz
- cp -f $(obj)/ramdisk.image.gz $@
- $(call src-sec, $(required) $(initrd)): $(obj)/kernel-%.c: $(obj)/kernel-%.gz FORCE
- @touch $@
- $(call obj-sec, $(required) $(initrd)): $(obj)/kernel-%.o: $(obj)/kernel-%.c FORCE
- $(call if_changed_dep,bootcc)
- $(call cmd,addsection)
- $(obj)/zImage.vmode: obj-boot += $(call obj-sec, $(required))
- $(obj)/zImage.vmode: $(call obj-sec, $(required)) $(obj-boot) FORCE
- $(call cmd,bootld,$(obj-boot))
- $(obj)/zImage.initrd.vmode: obj-boot += $(call obj-sec, $(required) $(initrd))
- $(obj)/zImage.initrd.vmode: $(call obj-sec, $(required) $(initrd)) $(obj-boot) FORCE
- $(call cmd,bootld,$(obj-boot))
- $(obj)/zImage: $(obj)/zImage.vmode $(obj)/addnote FORCE
- @cp -f $< $@
- $(call if_changed,addnote)
- $(obj)/zImage.initrd: $(obj)/zImage.initrd.vmode $(obj)/addnote FORCE
- @cp -f $< $@
- $(call if_changed,addnote)
- $(obj)/imagesize.c: vmlinux.strip
- $(call cmd,imagesize)
- install: $(CONFIGURE) $(BOOTIMAGE)
- sh -x $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" vmlinux System.map "$(INSTALL_PATH)" "$(BOOTIMAGE)"
- clean-files := $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip)
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