projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | # Makefile for making ELF bootable images for booting on CHRP |
| 2 | # using Open Firmware. | |
| 3 | # | |
| 4 | # Geert Uytterhoeven September 1997 | |
| 5 | # | |
| 6 | # Based on coffboot by Paul Mackerras | |
| 7 | # Simplified for ppc64 by Todd Inglett | |
| 8 | # | |
| 9 | # NOTE: this code is built for 32 bit in ELF32 format even though | |
| 10 | # it packages a 64 bit kernel. We do this to simplify the | |
| 11 | # bootloader and increase compatibility with OpenFirmware. | |
| 12 | # | |
| 13 | # To this end we need to define BOOTCC, etc, as the tools | |
| 14 | # needed to build the 32 bit image. These are normally HOSTCC, | |
| 15 | # but may be a third compiler if, for example, you are cross | |
| 16 | # compiling from an intel box. Once the 64bit ppc gcc is | |
| 17 | # stable it will probably simply be a compiler switch to | |
| 18 | # compile for 32bit mode. | |
| 19 | # To make it easier to setup a cross compiler, | |
| 20 | # CROSS32_COMPILE is setup as a prefix just like CROSS_COMPILE | |
| 21 | # in the toplevel makefile. | |
| 22 | ||
| 23 | ||
| 24 | HOSTCC := gcc | |
| 25 | BOOTCFLAGS := $(HOSTCFLAGS) $(LINUXINCLUDE) -fno-builtin | |
| 26 | BOOTAFLAGS := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional | |
| 27 | BOOTLFLAGS := -Ttext 0x00400000 -e _start -T $(srctree)/$(src)/zImage.lds | |
| 28 | OBJCOPYFLAGS := contents,alloc,load,readonly,data | |
| 29 | ||
| 30 | src-boot := crt0.S string.S prom.c main.c zlib.c imagesize.c div64.S | |
| 31 | src-boot := $(addprefix $(obj)/, $(src-boot)) | |
| 32 | obj-boot := $(addsuffix .o, $(basename $(src-boot))) | |
| 33 | ||
| 34 | quiet_cmd_bootcc = BOOTCC $@ | |
| 35 | cmd_bootcc = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $< | |
| 36 | ||
| 37 | quiet_cmd_bootas = BOOTAS $@ | |
| 38 | cmd_bootas = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTAFLAGS) -c -o $@ $< | |
| 39 | ||
| 40 | $(patsubst %.c,%.o, $(filter %.c, $(src-boot))): %.o: %.c | |
| 41 | $(call if_changed_dep,bootcc) | |
| 42 | $(patsubst %.S,%.o, $(filter %.S, $(src-boot))): %.o: %.S | |
| 43 | $(call if_changed_dep,bootas) | |
| 44 | ||
| 45 | #----------------------------------------------------------- | |
| 46 | # ELF sections within the zImage bootloader/wrapper | |
| 47 | #----------------------------------------------------------- | |
| 48 | required := vmlinux.strip | |
| 49 | initrd := initrd | |
| 50 | ||
| 51 | obj-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.o, $(section))) | |
| 52 | src-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.c, $(section))) | |
| 53 | gz-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.gz, $(section))) | |
| 54 | ||
| 55 | hostprogs-y := piggy addnote addRamDisk | |
| 56 | targets += zImage zImage.initrd imagesize.c \ | |
| 57 | $(patsubst $(obj)/%,%, $(call obj-sec, $(required) $(initrd))) \ | |
| 58 | $(patsubst $(obj)/%,%, $(call src-sec, $(required) $(initrd))) \ | |
| 59 | $(patsubst $(obj)/%,%, $(call gz-sec, $(required) $(initrd))) \ | |
| 60 | vmlinux.initrd | |
| 61 | extra-y := initrd.o | |
| 62 | ||
| 63 | quiet_cmd_ramdisk = RAMDISK $@ | |
| 64 | cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@ | |
| 65 | ||
| 66 | quiet_cmd_stripvm = STRIP $@ | |
| 67 | cmd_stripvm = $(STRIP) -s $< -o $@ | |
| 68 | ||
| 69 | vmlinux.strip: vmlinux FORCE | |
| 70 | $(call if_changed,stripvm) | |
| 71 | $(obj)/vmlinux.initrd: vmlinux.strip $(obj)/addRamDisk $(obj)/ramdisk.image.gz FORCE | |
| 72 | $(call if_changed,ramdisk) | |
| 73 | ||
| 74 | addsection = $(CROSS32OBJCOPY) $(1) \ | |
| 75 | --add-section=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $(1)))=$(patsubst %.o,%.gz, $(1)) \ | |
| 76 | --set-section-flags=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $(1)))=$(OBJCOPYFLAGS) | |
| 77 | ||
| 78 | quiet_cmd_addnote = ADDNOTE $@ | |
| 79 | cmd_addnote = $(CROSS32LD) $(BOOTLFLAGS) -o $@ $(obj-boot) && $(obj)/addnote $@ | |
| 80 | ||
| 81 | quiet_cmd_piggy = PIGGY $@ | |
| 82 | cmd_piggy = $(obj)/piggyback $(@:.o=) < $< | $(CROSS32AS) -o $@ | |
| 83 | ||
| 84 | $(call gz-sec, $(required)): $(obj)/kernel-%.gz: % FORCE | |
| 85 | $(call if_changed,gzip) | |
| 86 | ||
| 87 | $(obj)/kernel-initrd.gz: $(obj)/ramdisk.image.gz | |
| 88 | cp -f $(obj)/ramdisk.image.gz $@ | |
| 89 | ||
| 90 | $(call src-sec, $(required) $(initrd)): $(obj)/kernel-%.c: $(obj)/kernel-%.gz FORCE | |
| 91 | touch $@ | |
| 92 | ||
| 93 | $(call obj-sec, $(required) $(initrd)): $(obj)/kernel-%.o: $(obj)/kernel-%.c FORCE | |
| 94 | $(call if_changed_dep,bootcc) | |
| 95 | $(call addsection, $@) | |
| 96 | ||
| 97 | $(obj)/zImage: obj-boot += $(call obj-sec, $(required)) | |
| 98 | $(obj)/zImage: $(call obj-sec, $(required)) $(obj-boot) $(obj)/addnote FORCE | |
| 99 | $(call if_changed,addnote) | |
| 100 | ||
| 101 | $(obj)/zImage.initrd: obj-boot += $(call obj-sec, $(required) $(initrd)) | |
| 102 | $(obj)/zImage.initrd: $(call obj-sec, $(required) $(initrd)) $(obj-boot) $(obj)/addnote FORCE | |
| 103 | $(call if_changed,addnote) | |
| 104 | ||
| 105 | $(obj)/imagesize.c: vmlinux.strip | |
| 106 | @echo Generating $@ | |
| 107 | ls -l vmlinux.strip | \ | |
| 108 | awk '{printf "/* generated -- do not edit! */\n" \ | |
| 109 | "unsigned long vmlinux_filesize = %d;\n", $$5}' > $(obj)/imagesize.c | |
| 110 | $(CROSS_COMPILE)nm -n vmlinux | tail -n 1 | \ | |
| 111 | awk '{printf "unsigned long vmlinux_memsize = 0x%s;\n", substr($$1,8)}' \ | |
| 112 | >> $(obj)/imagesize.c | |
| 113 | ||
| 114 | install: $(CONFIGURE) $(BOOTIMAGE) | |
| 115 | sh -x $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" vmlinux System.map "$(INSTALL_PATH)" "$(BOOTIMAGE)" | |
| 116 | ||
| 117 | clean-files := $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip) |