u-boot 1.3.4 cpu：s5pv210 架构体系armv7---Makefile概述

1030阅读　0评论2015-02-03　l658775
分类：嵌入式

    ***********************目标***********************************
     1.分析uboot1.3.4如何引导内核
     2.uboot1.3.4和内核之间的参数传递
     3.uboot1.3.4的命令实现
     4.uboot1.3.4的环境变量
     ***********************目标***********************************

     ^^^^^^^^^^^^^^^^^^^^^^^^从头开始，fighting^^^^^^^^^^^^^^^^^^^^^^^^
        ***********************顶层Makefile*******************************
      点击(此处)折叠或打开
  1. VERSION = 1
  2. PATCHLEVEL = 3
  3. SUBLEVEL = 4
  4. EXTRAVERSION =
  5. U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
  6. VERSION_FILE = $(obj)include/version_autogenerated.h
        由代码可知uboot的版本为1.3.4。继续往下

点击(此处)折叠或打开

  1. #########################################################################
  2. #
  3. # U-boot build supports producing a object files to the separate external
  4. # directory. Two use cases are supported:
  5. #
  6. # 1) Add O= to the make command line
  7. # 'make O=/tmp/build all'
  8. #
  9. # 2) Set environement variable BUILD_DIR to point to the desired location
  10. # 'export BUILD_DIR=/tmp/build'
  11. # 'make'
  12. #
  13. # The second approach can also be used with a MAKEALL script
  14. # 'export BUILD_DIR=/tmp/build'
  15. # './MAKEALL'
  16. #
  17. # Command line 'O=' setting overrides BUILD_DIR environent variable.
  18. #
  19. # When none of the above methods is used the local build is performed and
  20. # the object files are placed in the source directory.
  21. #
         以上是关于输出目录的解释，为了保持目录的干净。
***********************顶层Makefile*******************************

################### 终端操作############################
######        现在编译并生成u-boot.bin，输出目录即是当前源码目录.使用以下命令：
######        1.make distclean
 ######      2.make _config
 ######      3.make （all）
################### 终端操作############################

    ***********************顶层Makefile*******************************
       点击(此处)折叠或打开
  1. smdkv210single_config : unconfig
  2. @$(MKCONFIG) $(@:_config=) arm s5pc11x smdkc110 samsung s5pc110
  3. @echo "TEXT_BASE = 0xc3e00000" > $(obj)board/samsung/smdkc110/config.mk
        执行三种操作
        unconfig是清除上一次的配置结果。操作结果如下：
        rm -rf  include/config.h include/config.mk board/*/config.tmp  include/autoconf.mk 

        @$(MKCONFIG) $(@:_config=) arm s5pc11x smdkc110 samsung s5pc110 等效于 
        ./mkconfig   smdkv210single arm s5pc11x smdkc110 samsung s5pc110
        
        @echo "TEXT_BASE = 0xc3e00000" > $(obj)board/samsung/smdkc110/config.mk
    ***********************顶层Makefile*******************************

    ***********************顶层./mkconfig*******************************
        点击(此处)折叠或打开
  1. # Script to create header files and links to configure
  2. # U-Boot for a specific board.
  3. #
  4. # Parameters: Target Architecture CPU Board [VENDOR] [SOC]
  5. #
  6. # (C) 2002-2006 DENX Software Engineering, Wolfgang Denk <wd@denx.de>
  7. #

    在mkconfig脚本中给出了mkconfig的用法：

        # Parameters:  Target  Architecture  CPU  Board [VENDOR] [SOC]

       因此传递给mkconfig的参数的意义分别是：  ./mkconfig   smdkv210single arm s5pc11x smdkc110 samsung s5pc110

       smdkv210single ：Target（目标板型号）

        arm：Architecture （目标板的CPU架构）

        s5pc11x：CPU （具体使用的CPU型号）

        smdkc110 ：Board

        samsung：VENDOR（生产厂家名）

        s5pc110：SOC

       结果创建链接文件和在include下创建config.h（"#include smdkv210single.h>" >>config.h)和config.mk。
 ***********************顶层./mkconfig*******************************    

     ***********************顶层Makefile*******************************   
以上执行完uboot的配置过程，现在开始make。依据从顶层Makefile开始  
     点击(此处)折叠或打开
  1. ifeq ($(obj)include/config.mk,$(wildcard $(obj)include/config.mk)) ############判断是否执行过make _config############

  3. # load ARCH, BOARD, and CPU configuration ############加载config.mk的配置信息，确定架构、目标板、cPU等配置############
  4. include $(obj)include/config.mk
  5. export    ARCH CPU BOARD VENDOR SOC   ############ ARCH CPU BOARD VENDOR SOC = arm s5pc11x smdkc110 samsung s5pc110 ############


  7. ifndef CROSS_COMPILE  ####决定编译工具链######
  8. ........
  9. ifeq ($(ARCH),arm)####指定工具链的位置######
  10. #CROSS_COMPILE = arm-linux-
  11. #CROSS_COMPILE = /usr/local/arm/4.4.1-eabi-cortex-a8/usr/bin/arm-linux-
  12. #CROSS_COMPILE = /usr/local/arm/4.2.2-eabi/usr/bin/arm-linux-
  13. CROSS_COMPILE = /usr/local/arm/arm-2009q3/bin/arm-none-linux-gnueabi-
  14. endif
  15. # load other configuration############加载其他配置############
    include $(TOPDIR)/config.mk
  16. ................
  17. else    # !config.mk ############未行过make _config，退出make过程############
  18. .....................
  19.  @echo "System not configured - see README" >&2
  20. endif
     加载完各个配置信息后，会生成各个库文件，然后开始真正的编译过程。

$(obj)u-boot.bin:       $(obj)u-boot

                $(OBJCOPY) ${OBJCFLAGS} -O binary $< $@

＝arm-linux-objcopy   -O binary u-boot  u-boot.bin

     具体的编译过程，后续。。。。。。
    ***********************顶层Makefile******************************* 
   
 ***********************include $(TOPDIR)/config.mk加载其他配置分析*******************************   
点击(此处)折叠或打开
  1. #
  2. # (C) Copyright 2000-2006
  3. # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  4. #
  5. # See file CREDITS for list of people who contributed to this
  6. # project.
  7. #
  8. # This program is free software; you can redistribute it and/or
  9. # modify it under the terms of the GNU General Public License as
  10. # published by the Free Software Foundation; either version 2 of
  11. # the License, or (at your option) any later version.
  12. #
  13. # This program is distributed in the hope that it will be useful,
  14. # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. # GNU General Public License for more details.
  17. #
  18. # You should have received a copy of the GNU General Public License
  19. # along with this program; if not, write to the Free Software
  20. # Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21. # MA 02111-1307 USA
  22. #
  24. #########################################################################
  26. ifneq ($(OBJTREE),$(SRCTREE))
  27. ifeq ($(CURDIR),$(SRCTREE))
  28. dir :=
  29. else
  30. dir := $(subst $(SRCTREE)/,,$(CURDIR))
  31. endif
  33. obj := $(if $(dir),$(OBJTREE)/$(dir)/,$(OBJTREE)/)
  34. src := $(if $(dir),$(SRCTREE)/$(dir)/,$(SRCTREE)/)
  36. $(shell mkdir -p $(obj))
  37. else
  38. obj :=
  39. src :=
  40. endif
  42. # clean the slate ...
  43. PLATFORM_RELFLAGS =
  44. PLATFORM_CPPFLAGS =
  45. PLATFORM_LDFLAGS =
  47. #
  48. # When cross-compiling on NetBSD, we have to define __PPC__ or else we
  49. # will pick up a va_list declaration that is incompatible with the
  50. # actual argument lists emitted by the compiler.
  51. #
  52. # [Tested on NetBSD/i386 1.5 + cross-powerpc-netbsd-1.3]
  54. ifeq ($(ARCH),ppc)
  55. ifeq ($(CROSS_COMPILE),powerpc-netbsd-)
  56. PLATFORM_CPPFLAGS+= -D__PPC__
  57. endif
  58. ifeq ($(CROSS_COMPILE),powerpc-openbsd-)
  59. PLATFORM_CPPFLAGS+= -D__PPC__
  60. endif
  61. endif
  63. ifeq ($(ARCH),arm)
  64. ifeq ($(CROSS_COMPILE),powerpc-netbsd-)
  65. PLATFORM_CPPFLAGS+= -D__ARM__
  66. endif
  67. ifeq ($(CROSS_COMPILE),powerpc-openbsd-)
  68. PLATFORM_CPPFLAGS+= -D__ARM__
  69. endif
  70. endif
  72. #########################################################################
  74. CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
  75. else if [ -x /bin/bash ]; then echo /bin/bash; \
  76. else echo sh; fi ; fi)
  78. ifeq ($(HOSTOS)-$(HOSTARCH),darwin-ppc)
  79. HOSTCC = cc
  80. else
  81. HOSTCC = gcc
  82. endif
  83. HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
  84. HOSTSTRIP = strip
  86. #########################################################################
  87. #
  88. # Option checker (courtesy linux kernel) to ensure
  89. # only supported compiler options are used
  90. #
  91. cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
  92. > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
  94. #
  95. # Include the make variables (CC, etc...)
  96. #
  97. AS = $(CROSS_COMPILE)as
  98. LD = $(CROSS_COMPILE)ld
  99. CC = $(CROSS_COMPILE)gcc
  100. CPP = $(CC) -E
  101. AR = $(CROSS_COMPILE)ar
  102. NM = $(CROSS_COMPILE)nm
  103. LDR = $(CROSS_COMPILE)ldr
  104. STRIP = $(CROSS_COMPILE)strip
  105. OBJCOPY = $(CROSS_COMPILE)objcopy
  106. OBJDUMP = $(CROSS_COMPILE)objdump
  107. RANLIB = $(CROSS_COMPILE)RANLIB
  109. #########################################################################
  111. # Load generated board configuration
  112. sinclude $(OBJTREE)/include/autoconf.mk #####和目标板的宏定义相关#########
  114. ifdef ARCH
  115. sinclude $(TOPDIR)/$(ARCH)_config.mk # include architecture dependend rules
  116. endif
  117. ifdef CPU
  118. sinclude $(TOPDIR)/cpu/$(CPU)/config.mk # include CPU specific rules
  119. endif
  120. ifdef SOC
  121. sinclude $(TOPDIR)/cpu/$(CPU)/$(SOC)/config.mk # include SoC specific rules
  122. endif
  123. ifdef VENDOR
  124. BOARDDIR = $(VENDOR)/$(BOARD)
  125. else
  126. BOARDDIR = $(BOARD)
  127. endif
  128. ifdef BOARD
  129. sinclude $(TOPDIR)/board/$(BOARDDIR)/config.mk # include board specific rules
  130. endif
  132. #########################################################################
  134. ifneq (,$(findstring s,$(MAKEFLAGS)))
  135. ARFLAGS = cr
  136. else
  137. ARFLAGS = crv
  138. endif
  139. RELFLAGS= $(PLATFORM_RELFLAGS)
  140. DBGFLAGS= -g # -DDEBUG
  141. OPTFLAGS= -Os #-fomit-frame-pointer
  142. ifndef LDSCRIPT  #####在上层Makefile并没有全局定义LDSCRIPT####
  143. #LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds.debug
  144. ifeq ($(CONFIG_NAND_U_BOOT),y)
  145. LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot-nand.lds
  146. else
  147. LDSCRIPT := $(TOPDIR)/board/$(BOARDDIR)/u-boot.lds
  148.  #####LDSCRIPT被定义为board/samsung/smdkc110/u-boot.lds####
  149. endif
  150. endif
  151. OBJCFLAGS += --gap-fill=0xff
  153. gccincdir := $(shell $(CC) -print-file-name=include)
  155. CPPFLAGS := $(DBGFLAGS) $(OPTFLAGS) $(RELFLAGS) \
  156. -D__KERNEL__
  157. ifneq ($(TEXT_BASE),)
  158. CPPFLAGS += -DTEXT_BASE=$(TEXT_BASE)
  159. endif
  161. ifneq ($(OBJTREE),$(SRCTREE))
  162. CPPFLAGS += -I$(OBJTREE)/include2 -I$(OBJTREE)/include
  163. endif
  165. CPPFLAGS += -I$(TOPDIR)/include
  166. CPPFLAGS += -fno-builtin -ffreestanding -nostdinc \
  167. -isystem $(gccincdir) -pipe $(PLATFORM_CPPFLAGS)
  169. ifdef BUILD_TAG
  170. CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes \
  171. -DBUILD_TAG='"$(BUILD_TAG)"'
  172. else
  173. CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
  174. endif
  176. CFLAGS += $(call cc-option,-fno-stack-protector)
  178. # avoid trigraph warnings while parsing pci.h (produced by NIOS gcc-2.9)
  179. # this option have to be placed behind -Wall -- that's why it is here
  180. ifeq ($(ARCH),nios)
  181. ifeq ($(findstring 2.9,$(shell $(CC) --version)),2.9)
  182. CFLAGS := $(CPPFLAGS) -Wall -Wno-trigraphs
  183. endif
  184. endif
  186. # $(CPPFLAGS) sets -g, which causes gcc to pass a suitable -g
  187. # option to the assembler.
  188. AFLAGS_DEBUG :=
  190. # turn jbsr into jsr for m68k
  191. ifeq ($(ARCH),m68k)
  192. ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
  193. AFLAGS_DEBUG := -Wa,-gstabs,-S
  194. endif
  195. endif
  197. AFLAGS := $(AFLAGS_DEBUG) -D__ASSEMBLY__ $(CPPFLAGS)
  199. LDFLAGS += -Bstatic -T $(LDSCRIPT) $(PLATFORM_LDFLAGS)
  200. ifneq ($(TEXT_BASE),)
  201. LDFLAGS += -Ttext $(TEXT_BASE)
  202. endif
  204. # Location of a usable BFD library, where we define "usable" as
  205. # "built for ${HOST}, supports ${TARGET}". Sensible values are
  206. # - When cross-compiling: the root of the cross-environment
  207. # - Linux/ppc (native): /usr
  208. # - NetBSD/ppc (native): you lose ... (must extract these from the
  209. # binutils build directory, plus the native and U-Boot include
  210. # files don't like each other)
  211. #
  212. # So far, this is used only by tools/gdb/Makefile.
  214. ifeq ($(HOSTOS)-$(HOSTARCH),darwin-ppc)
  215. BFD_ROOT_DIR = /usr/local/tools
  216. else
  217. ifeq ($(HOSTARCH),$(ARCH))
  218. # native
  219. BFD_ROOT_DIR = /usr
  220. else
  221. #BFD_ROOT_DIR = /LinuxPPC/CDK # Linux/i386
  222. #BFD_ROOT_DIR = /usr/pkg/cross # NetBSD/i386
  223. BFD_ROOT_DIR = /opt/powerpc
  224. endif
  225. endif
  227. ifeq ($(PCI_CLOCK),PCI_66M)
  228. CFLAGS := $(CFLAGS) -DPCI_66M
  229. endif
  231. #########################################################################
  233. export CONFIG_SHELL HPATH HOSTCC HOSTCFLAGS CROSS_COMPILE \
  234. AS LD CC CPP AR NM STRIP OBJCOPY OBJDUMP \
  235. MAKE
  236. export TEXT_BASE PLATFORM_CPPFLAGS PLATFORM_RELFLAGS CPPFLAGS CFLAGS AFLAGS
  238. #########################################################################
  240. ifndef REMOTE_BUILD
  242. %.s: %.S
  243. $(CPP) $(AFLAGS) -o $@ $<
  244. %.o: %.S
  245. $(CC) $(AFLAGS) -c -o $@ $<
  246. %.o: %.c
  247. $(CC) $(CFLAGS) -c -o $@ $<
  249. else
  251. $(obj)%.s: %.S
  252. $(CPP) $(AFLAGS) -o $@ $<
  253. $(obj)%.o: %.S
  254. $(CC) $(AFLAGS) -c -o $@ $<
  255. $(obj)%.o: %.c
  256. $(CC) $(CFLAGS) -c -o $@ $<
  257. endif
  259. #########################################################################
    从board/samsung/smdkc110/u-boot.lds可知

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  1. .text :
  2.     {
  3.      cpu/s5pc11x/start.o    (.text)
  4.      cpu/s5pc11x/s5pc110/cpu_init.o    (.text)
  5.      board/samsung/smdkc110/lowlevel_init.o    (.text)
  6.           cpu/s5pc11x/onenand_cp.o (.text)
  7.           cpu/s5pc11x/nand_cp.o (.text)
  8.           cpu/s5pc11x/movi.o (.text)
  9.           common/secure_boot.o (.text)
  10.      common/ace_sha1.o (.text)
  11.      cpu/s5pc11x/pmic.o (.text)
  12.      *(.text)
  13.     }
    生成的bin文件从cpu/s5pc11x/start.o开始执行。
      ***********************include $(TOPDIR)/config.mk加载其他配置分析*******************************    
   
***********************Makefile总结******************************* 
  顶层Makefile包含了各个子Makefile，并且用export定义了全局变量。当make时，Makefile顺序往下拓展执行，各个子Makefile被include进来，依据全局变量的定义，决定是否包含其他文件
   ***********************Makefile总结*******************************              
             
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