linux_2.6.30.4_Makefile_4--make zImage流程

890阅读　0评论2014-12-07　644924073
分类：LINUX

    分析一下make zImage的流程，具体的操作是：首先将linux-2.6.30.4/config_EmbedSky_W35_256MB改名为.config，然后make zImage.看一下make zImage之后发生了什么事情。

点击(此处)折叠或打开

  1. linux-2.6.30.4/Makefile
  2. 284 #config-targets=0, mixed-targets=0, dot-config=1,不会进入L285
  3. 285 ifeq ($(mixed-targets),1) #不成立跳过
  4. ...
  5. 291 ifeq ($(config-targets),1) #不成立跳过
  6. 304 else
  7. 305
  8. 306 ifeq ($(KBUILD_EXTMOD),)
  9. ......
  10. 354 include $(srctree)/arch/$(SRCARCH)/Makefile
在 arch/arm/Makefile中包含了zImage

点击(此处)折叠或打开

  1.   linux-2.6.30.4/arch/arm/Makefile
  2.    174    ifeq ($(CONFIG_XIP_KERNEL),y)
  3.    175    KBUILD_IMAGE := xipImage
  4.    176    else
  5.    177    KBUILD_IMAGE := zImage
  6.    178    endif
  7.    179    
  8.    180    all:    $(KBUILD_IMAGE)
  9.    181    
  10.    182    boot := arch/arm/boot
  11.    183    
  12.    193    zImage Image xipImage bootpImage uImage: vmlinux
  13.    194        $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@
  14. #zImage依赖于vmliux, vmliux在linux-2.6.30.4/Makefile中
1. linux-2.6.30.4/Makefile 中包含了arch/arm/Makefile
2. 在 arch/arm/Makefile中找到目标zImage
3. zImage依赖linux-2.6.30.4中的Makefile中vmlinux
4. 分析 linux-2.6.30.4/Makefile中vmlinux的依赖
5.
就第4步进行具体分析

点击(此处)折叠或打开

  1.    306    ifeq ($(KBUILD_EXTMOD),)
  2.    307    PHONY += scripts
  3.    308    scripts: scripts_basic include/config/auto.conf
  4.    309        $(Q)$(MAKE) $(build)=$(@)
  5.    310    
  6.    311    init-y        := init/
  7.    312    drivers-y    := drivers/ sound/ firmware/
  8.    313    net-y        := net/
  9.    314    libs-y        := lib/
  10.    315    core-y        := usr/
  11.    316    endif # KBUILD_EXTMOD
  12.    317    
  13.    318    ifeq ($(dot-config),1)
  14.    319    -include include/config/auto.conf
  15.    320    
  16.    321    ifeq ($(KBUILD_EXTMOD),)
  17.    322    -include include/config/auto.conf.cmd
  18.    323    
  19.    324    $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
  20.    325    
  21.    326    include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
  22.    327        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
  23.    328    else
  24.    329    PHONY += include/config/auto.conf
  25.    330    
  26.    331    include/config/auto.conf:
  27.    332        $(Q)test -e include/linux/autoconf.h -a -e $@ || (        \
  28.    333        echo;                                \
  29.    334        echo " ERROR: Kernel configuration is invalid.";        \
  30.    335        echo " include/linux/autoconf.h or $@ are missing.";    \
  31.    336        echo " Run 'make oldconfig && make prepare' on kernel src to fix it.";    \
  32.    337        echo;                                \
  33.    338        /bin/false)
  34.    339    
  35.    340    endif # KBUILD_EXTMOD

  37. #vmliux的依赖vmlinux-lds=arch/arm/kernel/vmlinux.lds vmlinux-init=arch/arm/kernel/head-nommu.o arch/arm/      kernel/init_task.o  init/built-in.o vmlinux-main= usr/built-in.o  arch/arm/kernel/built-in.o  arch/arm/mm/built-in.o  arch/arm/common/built-in.o  kernel/built-in.o  mm/built-in.o  fs/built-in.o  ipc/built-in.o  security/    built-in.o  crypto/built-in.o  block/built-in.o  arch/arm/lib/lib.a  lib/lib.a  arch/arm/lib/built-in.o  lib/   built-in.o  drivers/built-in.o  sound/built-in.o  firmware/built-in.o  net/built-in.o kallsyms=
  38.    576    vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
  39. #vmlinux-lds等 依赖于vmlinux-dirs
  40.    598    $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
  41.    
  42.    601    PHONY += $(vmlinux-dirs)
  43.    602    $(vmlinux-dirs): prepare scripts
  44.    603        $(Q)$(MAKE) $(build)=$@

  46.    636    prepare3: include/config/kernel.release
  47.    649    
  48.    650    prepare2: prepare3 outputmakefile
  49.    651    
  50.    652    prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
  51.    653     include/asm include/config/auto.conf
  52.    654        $(cmd_crmodverdir)
  53.    655    
  54.    656    archprepare: prepare1 scripts_basic
  55.    657    
  56.    658    prepare0: archprepare FORCE
  57.    659        $(Q)$(MAKE) $(build)=.
  58.    660        $(Q)$(MAKE) $(build)=. missing-syscalls
  59.    661    
  60.    662    prepare: prepare0
  1. 整理一下上述的各个依赖关系，如下图所示
  3. 下面按照执行的顺序详细分析一下，各个步骤：
  4. 4.1 首先执行的是scripts的过程：
  5.     这个过程类似于make menuconfig的过程，只不过最后调用的是:conf -s ,不产生图形界面。

    点击(此处)折叠或打开

    1. scrpts的过程:
    2.  326    include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
    3.  327        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
    4.  即: make -f /root/kernel/linux-2.6.30.4/Makefile silentoldconfig
    5.      make -f scripts/Makefile.build obj=scripts/basic
    6.      mkdir -p include/linux include/config
    7.      make -f scripts/Makefile.build obj=scripts/kconfig silentoldconfig
    8.      scripts/kconfig/conf -s arch/arm/Kconfig
  6. 4.2 其次执行的是prepare的过程：

  8. 点击(此处)折叠或打开

    1. linux-2.6.30.4/Makefile 中archprepare: prepare1 scripts_basic
    2. 而在
    3. arch/arm/Makefile中archprepare: maketools
    4. 这地方有点没有看明白，在Makefile和arch/arm/Makefile中都有archprepare的规则，
    5. 什么这两个都执行了，而不是一个覆盖另一个？
    6.   
    7.    linux-2.6.30.4/Makefile
    8.    714    include/linux/version.h: $(srctree)/Makefile FORCE
    9.    715        $(call filechk,version.h)
    10.    这将会调用linux-2.6.30.4/scripts/Kbuild.include中的filechk函数,主要作用是：用Makefile中的版本信息更新include/linux/version.h中的版本信息。

    12.   arch/arm/Makefile
    13.   $(Q)$(MAKE) $(build)=arch/arm/tools include/asm-arm/mach-types.h
    14.  即: make -f scripts/Makefile.build obj=arch/arm/tools include/asm-arm/mach-types.h
    15.  这会调用arch/arm/tools/Makefile中的规则产生include/asm-arm/mach-types.h 文件

    17.    linux-2.6.30.4/Makefile
    18.    628    include/config/kernel.release: include/config/auto.conf FORCE
    19.    629        $(Q)rm -f $@
    20.    630        $(Q)echo $(kernelrelease) > $@
    21.    这会产生kernel.release文件: echo 2.6.30.4-EmbedSky > include/config/kernel.release
    22.     
    23.    linux-2.6.30.4/Makefile
    24.    717    include/linux/utsrelease.h: include/config/kernel.release FORCE
    25.    718        $(call filechk,utsrelease.h)
    26. 这将会调用linux-2.6.30.4/scripts/Kbuild.include中的filechk函数，主要是检查include/config/kernel.release中的kernel版本信息是否超过64字节，超过则报错。

    28.    linux-2.6.30.4/Makefile
    29.    693    include/asm: FORCE
    30.    694        $(Q)$(check-symlink)
    31.    695        $(Q)$(create-symlink)
    32.   #刚生出来(下载)的内核代码是不存在include/asm目录的，check-symlink是检查include/asm是存在并指向asm-arm,如果不存在asm-arm的符号连接则创建，存在但不正确就打印出错信息。

    34.    linux-2.6.30.4/Makefile
    35.    prepare1的最后执行 $(cmd_crmodverdir)
    36.    1146    cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
    37.    1147     $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
    38.    即:mkdir -p .tmp_versions

    39.
    40.    linux-2.6.30.4/Makefile
    41.    archprepare的第二个依赖 scripts_basic
    42.    即:make -f scripts/Makefile.build obj=scripts/basic

    44.    linux-2.6.30.4/Makefile
    45.    prepare0的依赖执行完之后，执行：
    46.    make -f scripts/Makefile.build obj=.
    47. #执行scripts/Makefile的__build目标，此处只执行always依赖，(KBUILD_BUILTIN=1，但是$(builtin-target) $(lib-target) $(extra-y)都为空，KBUILD_MODULES=0)
    48. always=./include/linux/bounds.h ./include/asm/asm-offsets.h 
    49. __build: ./include/linux/bounds.h ./include/asm/asm-offsets.h 
    50. :
    51. 这将会编译kernel/bounds.c 和 arch/arm/kernel/asm-offsets.c两个文件
    4.3 vmlinux-dirs的依赖执行完了之后，再去执行vmlinux-dirs的命令了

    点击(此处)折叠或打开

    1. linux-2.6.30.4/Makefile
    2.  880 PHONY += $(vmlinux-dirs)
    3.  881 $(vmlinux-dirs): prepare scripts
    4.  882 $(Q)$(MAKE) $(build)=$@
    5. 由于命令中用到$@即vmlinux-dirs先转到vmlinux-dirs的定义处:

    6.
    7. linux-2.6.30.4/Makefile
    8.  653 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
    9.  654 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
    10.  655 $(net-y) $(net-m) $(libs-y) $(libs-m)))
    11. 可以看到vmlinux-dirs是:
    12. vmlinux-dirs=init usr arch/arm/kernel arch/arm/mm arch/arm/common arch/arm/mach-s3c2410 arch/arm/mach-s3c2400 arch/arm/mach-s3c2412 arch/arm/mach-s3c2440 arch/arm/mach-s3c2442 arch/arm/mach-s3c2443 arch/arm/plat-s3c24xx arch/arm/plat-s3c kernel mm fs ipc security crypto block drivers sound firmware net arch/arm/lib lib
    13. 这就是要去内核的每一个目录下面去编译需要的每一个源文件了

    15. make -f scripts/Makefile.build obj=init
    16. #builtin-target=init/built-in.o lib-target= extra-y= subdir-ym= always=

    18. linux-2.6.30.4/scripts/Makefile.build
    19.  93 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
    20.  94 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
    21.  95 $(subdir-ym) $(always)
    22.  96 @:
    23. #此时只有builtin-target=init/built-in.o有定义，下一步生成目标builtin-target

    25. linux-2.6.30.4/scripts/Makefile.build
    26. 286 ifdef builtin-target
    27. 287 quiet_cmd_link_o_target = LD $@
    28. 288 # If the list of objects to link is empty, just create an empty built-in.o
    29. 289 cmd_link_o_target = $(if $(strip $(obj-y)),\
    30. 290 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
    31. 291 $(cmd_secanalysis),\
    32. 292 rm -f $@; $(AR) rcs $@)
    33. 293
    34. 294 $(builtin-target): $(obj-y) FORCE
    35. 295 $(call if_changed,link_o_target)

    37. #先去执行builtin-target的依赖obj-y，将所以.c编译为.o, .s编译为.o
    38. obj-y=init/main.o init/version.o init/mounts.o init/noinitramfs.o init/calibrate.o
    39. ld 
    40. 把obj-y链接成init/built-in.o
    41. 目标vmlinux-dirs执行完成后，built-in.o

    43.  $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
    44. 因为这个指令是一个空指令，所以当vmlinux-dirs执行完成之后,vmlinux的依赖$(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds)都准备好了。
    4.4 vmlinux的两个依赖: vmlinux.o与$(kallsyms.o)

    点击(此处)折叠或打开

    1. 4.4.1 vmlinux的一个依赖是:vmlinux.o
    2. linux-2.6.30.4/Makefile
    3.  866 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
    4.  867 $(call if_changed_rule,vmlinux-modpost)

    6. linux-2.6.30.4/scripts/Kbuild.include
    7. 208 if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
    8. 209 @set -e; \
    9. 210 $(rule_$(1)))
    10. #如果目标有更新则执行rule_vmlinux-modpost
    11. linux-2.6.30.4/Makefile
    12.  838 define rule_vmlinux-modpost
    13.  839 :
    14.  840 +$(call cmd,vmlinux-modpost)
    15.  841 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
    16.  842 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
    17.  843 endef

    19. linux-2.6.30.4/Makefile
    20.  834 quiet_cmd_vmlinux-modpost = LD $@
    21.  835 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
    22.  836 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
    23.  837 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
    24. #首先链接生成vmlinux.o: L834 arm-linux-ld -EL -r -o vmlinux.o
    25. 然后执行:make -f /root/kernel/linux-2.6.30.4/scripts/Makefile.modpost vmlinux.o，
    26. 最后把链接生成vmlinux.o的过程打印到.cmd文件中

    28. linux-2.6.30.4/scripts/Makefile.modpost
    29. 103 vmlinux.o: FORCE
    30. 104 @rm -fr $(kernelmarkersfile)
    31. 105 $(call cmd,kernel-mod)
    32. 然后执行:
    33. 101 cmd_kernel-mod = $(modpost) $@
    34. 即:scripts/mod/modpost -o /root/kernel/linux-2.6.30.4/Module.symvers -S -c vmlinux.o
    35. 用scripts/mod/modpost处理vmlinux.o，得到Module.symvers,这个具体有什么作用现在还没有搞清楚。


    38. 4.4.2 vmlinux的一个依赖是:$(kallsyms.o)=.tmp_kallsyms2.o
    39.  801 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
    40.  802 $(call if_changed_dep,as_o_S)

    42. .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
    43. 依赖中又含有%.o: %.S ? 没看明白
    44. 看到打印中: /opt/EmbedSky/4.3.3/bin/arm-none-linux-gnueabi-nm -n .tmp_vmlinux2 | scripts/kallsyms > .tmp_kallsyms2.S
    45. 然后通过: arm-linux-gcc $(a_flags) -c -o .tmp_kallsyms2.o .tmp_kallsyms2.S

    47. linux-2.6.30.4/scripts/Kbuild.include
    48. 198 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
    49. 199 @set -e; \
    50. 200 $(echo-cmd) $(cmd_$(1)); \
    51. 201 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
    52. 202 rm -f $(depfile); \
    53. 203 mv -f $(dot-target).tmp $(dot-target).cmd)

    55. #执行cmd_as_o_S
    56. linux-2.6.30.4/scripts/Makefile
    57. 1580 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<

  9. 4.5 当vmlinux的所有依赖都ok之后，执行vmlinux的命令

    点击(此处)折叠或打开

    1. 845 # vmlinux image - including updated kernel symbols
    2.  846 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
    3.  847 ifdef CONFIG_HEADERS_CHECK
    4.  848 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
    5.  849 endif
    6.  850 ifdef CONFIG_SAMPLES
    7.  851 $(Q)$(MAKE) $(build)=samples
    8.  852 endif
    9.  853 ifdef CONFIG_BUILD_DOCSRC
    10.  854 $(Q)$(MAKE) $(build)=Documentation
    11.  855 endif
    12.  856 $(call vmlinux-modpost)
    13.  857 $(call if_changed_rule,vmlinux__)
    14.  858 $(Q)rm -f .old_version

    16. #CONFIG_HEADERS_CHECK CONFIG_SAMPLES CONFIG_BUILD_DOCSRC都为空，所以
    17. 4.5.1 $(call vmlinux-modpost) ;没找到定义
    18. 4.5.2 $(call if_changed_rule,vmlinux__) ;具体分析
    19. 4.5.3 $(Q)rm -f .old_version


    22. linux-2.6.30.4/scripts/Kbuild.include
    23. 208 if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ),                 \
    24. 209     @set -e;                                                             \
    25. 210     $(rule_$(1)))
    26. #如果目标有更新则执行rule_vmlinux__

    28. linux-2.6.30.4/Makefile
    29.  731 define rule_vmlinux__
    30.  732     :
    31.  733     $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
    32.  734 
    33.  735     $(call cmd,vmlinux__)
    34.  736     $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
    35.  737 
    36.  738     $(Q)$(if $($(quiet)cmd_sysmap),                                      \
    37.  739       echo '  $($(quiet)cmd_sysmap)  System.map' &&)                     \
    38.  740     $(cmd_sysmap) $@ System.map;                                         \
    39.  741     if [ $$? -ne 0 ]; then                                               \
    40.  742         rm -f $@;                                                    \
    41.  743         /bin/false;                                                  \
    42.  744     fi;
    43.  745     $(verify_kallsyms)
    44.  746 endef
    45. L733行 CONFIG_KALLSYMS=y，所以不做任何操作
    46. L735行 在linux-2.6.30.4/scripts/Kbuild.include L160 cmd = @$(echo-cmd) $(cmd_$(1)),打印并执行cmd_vmlinux__

    48. linux-2.6.30.4/Makefile
    49.  704 quiet_cmd_vmlinux__ ?= LD      $@
    50.  705       cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
    51.  706       -T $(vmlinux-lds) $(vmlinux-init)                          \
    52.  707       --start-group $(vmlinux-main) --end-group                  \
    53.  708       $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
    54. #链接生成vmlinux的过程:
    55. L735 arm-linux-ld -o vmlinux -Tarch/arm/kernel/vmlinux.lds  
    56. L736 将链接生成vmlinux的过程写入到.cmd中
    57. L738   在linux-2.6.30.4/Makefile中 L724 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap

    59. .scripts/mksysmap  System.map 
    60. ./scripts/mksysmap vmlinux System.map
    61. if [ $? -ne 0 ];
    62.     then rm -f vmlinux;
    63. /bin/false; 
    64. fi

    66. L858 rm -f .old_version
    5. 生成最终的zImage

    点击(此处)折叠或打开

    1. 终于zImage的依赖vmlinux执行完了,下面回到arch/arm/Makefile中执行zImge的命令过程：
    2. linux-2.6.30.4/arch/am/Makefile
    3. 230 zImage Image xipImage bootpImage uImage: vmlinux
    4. 231 $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@
    5.  #make -f scripts/Makefile.build obj=arch/arm/boot MACHINE=arch/arm/mach-s3c2410/ arch/arm/boot/zImage

    7. #执行arch/arm/boot/Makefile中的zImage
    8. linux-2.6.30.4/arch/arm/boot/Makefile
    9.  56 $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
    10.  57 $(call if_changed,objcopy)
    11.  58 @cp -f arch/arm/boot/zImage zImage.bin
    12.  59 @echo ' Kernel: $@ is ready'
    13. 首先生成arch/arm/boot/compress/vmlinux

    15. linux-2.6.30.4/arch/arm/boot/Makefile中
    16.  53 $(obj)/compressed/vmlinux: $(obj)/Image FORCE
    17.  54 $(Q)$(MAKE) $(build)=$(obj)/compressed $@
    18.   make -f scripts/Makefile.build obj=arch/arm/boot/compressed arch/arm/boot/compressed/vmlinux

    20. 执行arch/arm/boot/compress/Makefile
    21. linux-2.6.30.4/arch/arm/boot/compressed/Makefile
    22.  94 $(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
    23.  95 $(addprefix $(obj)/, $(OBJS)) FORCE
    24.  96 $(call if_changed,ld)
    25.  97 @:

    27. #arm-linux-gcc -c -o arch/arm/boot/compressed/head.o arch/arm/boot/compressed/head.S
    28. linux-2.6.30.4/arch/arm/boot/compressed/Makefile
    29. 102 $(obj)/piggy.o: $(obj)/piggy.gz FORCE
    30. gzip -f -9 < arch/arm/boot/compressed/../Image > arch/arm/boot/compressed/piggy.gz
    31. piggy.o
    32. #arm-linux-gcc -c -o arch/arm/boot/compressed/piggy.o arch/arm/boot/compressed/piggy.S

    34. #arm-linux-gcc -c -o arch/arm/boot/compressed/misc.o arch/arm/boot/compressed/misc.c

    35.
    36. #arm-linux-ld -T arch/arm/boot/compressed/vmlinux.lds compressed/head.o piggy.o misc.o -o arch/arm/boot/compressed/vmlinux

    38. linux-2.6.30.4/arch/arm/boot/Makefile
    39.  56 $(obj)/zImage: $(obj)/compressed/vmlinux FORCE
    40.  57 $(call if_changed,objcopy)
    41.  58 @cp -f arch/arm/boot/zImage zImage.bin
    42.  59 @echo ' Kernel: $@ is ready'
    43. #好了compressed/vmlinux也生成了，最后一步$(call if_changed, objcopy)

    45. linux-2.6.30.4/scripts/Kbuild.include
    46. 192 if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
    47. 193 @set -e; \
    48. 194 $(echo-cmd) $(cmd_$(1)); \
    49. 195 echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
    50. #打印并执行$(cmd_objcopy)，最后把$(cmd_objcopy)写到.cmd文件中

    52. linux-2.6.30.4/scripts/Makefile.lib
    53. 184 quiet_cmd_objcopy = OBJCOPY $@
    54. 185 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
    55. 即:arm-linux-objcopy -O binary -R .note -R .note.gnu.build-id -R .comment -S arch/arm/boot/compressed/vmlinux arch/arm/boot/zImage
    56. 将vmlinux这个elf的二进制文件，转换为raw二进制文件。
    终于完成了，zImage的过程，不容易啊！
  10. 【参考文章】:
  11. 1. linux zImage生成过程详解 http://blog.csdn.net/boyskung/article/details/3616211
  12. 2. gnu make manual 
  13. 3. 曲径通幽论坛的大作  
上一篇：rk3188--1.mkimage.sh及cpio打包过程分析
下一篇：linux_2.6.30.4_Makefile_2--make menuconfig 流程分析