1 # Makefile for making ELF bootable images for booting on CHRP
4 # Geert Uytterhoeven September 1997
6 # Based on coffboot by Paul Mackerras
7 # Simplified for ppc64 by Todd Inglett
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.
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.
24 #CROSS32_COMPILE = /usr/local/ppc/bin/powerpc-linux-
26 HAS_BIARCH := $(shell if gcc -m32 -S -o /dev/null -xc /dev/null > /dev/null 2>&1; then echo y; else echo n; fi;)
27 ifeq ($(HAS_BIARCH),y)
29 BOOTLD := ld -m elf32ppclinux
31 BOOTOBJCOPY := objcopy --target elf32-powerpc
33 BOOTCC = $(CROSS32_COMPILE)gcc
34 BOOTLD = $(CROSS32_COMPILE)ld
35 BOOTAS = $(CROSS32_COMPILE)as
36 BOOTOBJCOPY = $(CROSS32_COMPILE)objcopy
40 BOOTCFLAGS := $(HOSTCFLAGS) $(LINUXINCLUDE) -fno-builtin
41 BOOTAFLAGS := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional
42 BOOTLFLAGS := -Ttext 0x00400000 -e _start -T $(srctree)/$(src)/zImage.lds
43 OBJCOPYFLAGS := contents,alloc,load,readonly,data
45 src-boot := crt0.S string.S prom.c main.c zlib.c imagesize.c div64.S
46 src-boot := $(addprefix $(obj)/, $(src-boot))
47 obj-boot := $(addsuffix .o, $(basename $(src-boot)))
49 quiet_cmd_bootcc = BOOTCC $@
50 cmd_bootcc = $(BOOTCC) -Wp,-MD,$(depfile) $(BOOTCFLAGS) -c -o $@ $<
52 quiet_cmd_bootas = BOOTAS $@
53 cmd_bootas = $(BOOTCC) -Wp,-MD,$(depfile) $(BOOTAFLAGS) -c -o $@ $<
55 $(patsubst %.c,%.o, $(filter %.c, $(src-boot))): %.o: %.c
56 $(call if_changed_dep,bootcc)
57 $(patsubst %.S,%.o, $(filter %.S, $(src-boot))): %.o: %.S
58 $(call if_changed_dep,bootas)
60 #-----------------------------------------------------------
61 # ELF sections within the zImage bootloader/wrapper
62 #-----------------------------------------------------------
63 required := vmlinux.strip
66 obj-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.o, $(section)))
67 src-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.c, $(section)))
68 gz-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.gz, $(section)))
70 hostprogs-y := piggy addnote addRamDisk
71 targets += zImage zImage.initrd imagesize.c \
72 $(patsubst $(obj)/%,%, $(call obj-sec, $(required) $(initrd))) \
73 $(patsubst $(obj)/%,%, $(call src-sec, $(required) $(initrd))) \
74 $(patsubst $(obj)/%,%, $(call gz-sec, $(required) $(initrd))) \
78 quiet_cmd_ramdisk = RAMDISK $@
79 cmd_ramdisk = $(obj)/addRamDisk $(obj)/ramdisk.image.gz $< $@
81 quiet_cmd_stripvm = STRIP $@
82 cmd_stripvm = $(STRIP) -s $< -o $@
84 vmlinux.strip: vmlinux FORCE
85 $(call if_changed,stripvm)
86 $(obj)/vmlinux.initrd: vmlinux.strip $(obj)/addRamDisk $(obj)/ramdisk.image.gz FORCE
87 $(call if_changed,ramdisk)
89 addsection = $(BOOTOBJCOPY) $(1) \
90 --add-section=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $(1)))=$(patsubst %.o,%.gz, $(1)) \
91 --set-section-flags=.kernel:$(strip $(patsubst $(obj)/kernel-%.o,%, $(1)))=$(OBJCOPYFLAGS)
93 quiet_cmd_addnote = ADDNOTE $@
94 cmd_addnote = $(BOOTLD) $(BOOTLFLAGS) -o $@ $(obj-boot) && $(obj)/addnote $@
96 quiet_cmd_piggy = PIGGY $@
97 cmd_piggy = $(obj)/piggyback $(@:.o=) < $< | $(BOOTAS) -o $@
99 $(call gz-sec, $(required)): $(obj)/kernel-%.gz: % FORCE
100 $(call if_changed,gzip)
102 $(obj)/kernel-initrd.gz: $(obj)/ramdisk.image.gz
103 cp -f $(obj)/ramdisk.image.gz $@
105 $(call src-sec, $(required) $(initrd)): $(obj)/kernel-%.c: $(obj)/kernel-%.gz FORCE
108 $(call obj-sec, $(required) $(initrd)): $(obj)/kernel-%.o: $(obj)/kernel-%.c FORCE
109 $(call if_changed_dep,bootcc)
110 $(call addsection, $@)
112 $(obj)/zImage: obj-boot += $(call obj-sec, $(required))
113 $(obj)/zImage: $(call obj-sec, $(required)) $(obj-boot) $(obj)/addnote FORCE
114 $(call if_changed,addnote)
116 $(obj)/zImage.stub: $(obj-boot) FORCE
117 $(BOOTLD) -r $(BOOTLFLAGS) -o $@ $(obj-boot)
119 $(obj)/zImage.initrd: obj-boot += $(call obj-sec, $(required) $(initrd))
120 $(obj)/zImage.initrd: $(call obj-sec, $(required) $(initrd)) $(obj-boot) $(obj)/addnote FORCE
121 $(call if_changed,addnote)
123 $(obj)/imagesize.c: vmlinux.strip
125 ls -l vmlinux.strip | \
126 awk '{printf "/* generated -- do not edit! */\n" \
127 "unsigned long vmlinux_filesize = %d;\n", $$5}' > $(obj)/imagesize.c
128 $(CROSS_COMPILE)nm -n vmlinux | tail -n 1 | \
129 awk '{printf "unsigned long vmlinux_memsize = 0x%s;\n", substr($$1,8)}' \
130 >> $(obj)/imagesize.c
132 install: $(CONFIGURE) $(obj)/$(BOOTIMAGE)
133 sh -x $(src)/install.sh "$(KERNELRELEASE)" "$(obj)/$(BOOTIMAGE)" "$(INSTALL_PATH)"
135 clean-files := $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip)