uboot-Makefile

源码编译

uboot 源代码链接

$cat menu_demo/demo_kconfig 

menu "menu1"

config MENU_SUBITEM1-1
bool
prompt "entry1.1"

config MENU_SUBITEM1-2
bool
prompt "entry1.2"

config MENU_SUBITEM1-3
bool
prompt "entry1.3"

endmenu


menu "menu2"

config MENU_SUBITEM2-1
bool
prompt "entry2.1"

config MENU_SUBITEM2-2
bool
prompt "entry2.2"

config MENU_SUBITEM2-3
bool
prompt "entry2.3"

endmenu

# for arm
$export ARCH=arm
$export CROSS_COMPILE=arm-linux-gnueabi-
$make  vexpress_ca9x4_defconfig 
$make -j4

make help

$make help
Cleaning targets:
  clean		  - Remove most generated files but keep the config
  mrproper	  - Remove all generated files + config + various backup files
  distclean	  - mrproper + remove editor backup and patch files

Configuration targets:
  config	  - Update current config utilising a line-oriented program
  nconfig         - Update current config utilising a ncurses menu based
                    program
  menuconfig	  - Update current config utilising a menu based program
  xconfig	  - Update current config utilising a Qt based front-end
  gconfig	  - Update current config utilising a GTK+ based front-end
  oldconfig	  - Update current config utilising a provided .config as base
  localmodconfig  - Update current config disabling modules not loaded
  localyesconfig  - Update current config converting local mods to core
  defconfig	  - New config with default from ARCH supplied defconfig
  savedefconfig   - Save current config as ./defconfig (minimal config)
  allnoconfig	  - New config where all options are answered with no
  allyesconfig	  - New config where all options are accepted with yes
  allmodconfig	  - New config selecting modules when possible
  alldefconfig    - New config with all symbols set to default
  randconfig	  - New config with random answer to all options
  listnewconfig   - List new options
  olddefconfig	  - Same as oldconfig but sets new symbols to their
                    default value without prompting

Test targets:

  check           - Run all automated tests that use sandbox

Other generic targets:
  all		  - Build all necessary images depending on configuration
  tests		  - Build U-Boot for sandbox and run tests
* u-boot	  - Build the bare u-boot
  dir/            - Build all files in dir and below
  dir/file.[oisS] - Build specified target only
  dir/file.lst    - Build specified mixed source/assembly target only
                    (requires a recent binutils and recent build (System.map))
  tags/ctags	  - Generate ctags file for editors
  etags		  - Generate etags file for editors
  cscope	  - Generate cscope index
  ubootrelease	  - Output the release version string (use with make -s)
  ubootversion	  - Output the version stored in Makefile (use with make -s)
  cfg		  - Don't build, just create the .cfg files
  envtools	  - Build only the target-side environment tools

Static analysers
  checkstack      - Generate a list of stack hogs
  coccicheck      - Execute static code analysis with Coccinelle

Documentation targets:
 Linux kernel internal documentation in different formats from ReST:
  htmldocs        - HTML
  latexdocs       - LaTeX
  pdfdocs         - PDF
  epubdocs        - EPUB
  xmldocs         - XML
  linkcheckdocs   - check for broken external links (will connect to external hosts)
  refcheckdocs    - check for references to non-existing files under Documentation
  cleandocs       - clean all generated files

  make SPHINXDIRS="s1 s2" [target] Generate only docs of folder s1, s2
  valid values for SPHINXDIRS are: 

  make SPHINX_CONF={conf-file} [target] use *additional* sphinx-build
  configuration. This is e.g. useful to build with nit-picking config.

  Default location for the generated documents is Documentation/output

  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build
  make V=2   [targets] 2 => give reason for rebuild of target
  make O=dir [targets] Locate all output files in "dir", including .config
  make C=1   [targets] Check all c source with $CHECK (sparse by default)
  make C=2   [targets] Force check of all c source with $CHECK
  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections
  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where
		1: warnings which may be relevant and do not occur too often
		2: warnings which occur quite often but may still be relevant
		3: more obscure warnings, can most likely be ignored
		Multiple levels can be combined with W=12 or W=123

Execute "make" or "make all" to build all targets marked with [*] 
For further info see the ./README file

config targets

make config

• scripts/kconfig/conf --oldaskconfig Kconfig
  config - Update current config utilising a line-oriented program
• 针对Kconfig文件， 手动设置config项、字符窗口

ospin@ospin-VirtualBox:~/code/u-boot-2018.11$ scripts/kconfig/conf --oldaskconfig menu_demo/demo_kconfig 
*
* Linux Kernel Configuration
*
*
* menu1
*
entry1.1 (MENU_SUBITEM1-1) [N/y/?] N
entry1.2 (MENU_SUBITEM1-2) [N/y/?] N
entry1.3 (MENU_SUBITEM1-3) [N/y/?] N
*
* menu2
*
entry2.1 (MENU_SUBITEM2-1) [N/y/?] y
entry2.2 (MENU_SUBITEM2-2) [N/y/?] y
entry2.3 (MENU_SUBITEM2-3) [N/y/?] y
#
# configuration written to .config
#
ospin@ospin-VirtualBox:~/code/u-boot-2018.11$ cat .config
#
# Automatically generated file; DO NOT EDIT.
# Linux Kernel Configuration
#

#
# menu1
#
# CONFIG_MENU_SUBITEM1-1 is not set
# CONFIG_MENU_SUBITEM1-2 is not set
# CONFIG_MENU_SUBITEM1-3 is not set

#
# menu2
#
CONFIG_MENU_SUBITEM2-1=y
CONFIG_MENU_SUBITEM2-2=y
CONFIG_MENU_SUBITEM2-3=y

make oldconfig

• 命令行窗口
• 基于已有的.config，根据Kconfig的增量变化–要求用户手动配置。相比make config更加简便了。

make nconfig/menuconfig/xconfig/gconfig

nconfig/menuconfig/xconfig/gconfig差别在显示窗口不同，举例nconfig：

• scripts/kconfig/nconf Kconfig
  nconfig - Update current config utilising a ncurses menu based

• scripts/kconfig/mconf Kconfig
  menuconfig - Update current config utilising a menu based program

• others
  xconfig - Update current config utilising a Qt based front-end
  gconfig - Update current config utilising a GTK+ based front-end

generic targets

1. 调试技巧

1. Makefile 编译出了什么？

   使用git工具将源码配置好 && 编译完毕后 && 使用git status 命令即可看到编译输出的全部文件
   

2. Makefile 编译对象日志

   make --trace vexpress_ca9x4_defconfig | tee trace_config
   cat  trace_config
   

   日志：

   Makefile:415: target 'scripts_basic' does not exist
   make -f ./scripts/Makefile.build obj=scripts/basic
   scripts/Makefile.host:97: update target 'scripts/basic/fixdep' due to: FORCE
   scripts/Makefile.build:117: update target '__build' due to: scripts/basic/fixdep
   :
   rm -f .tmp_quiet_recordmcount
   Makefile:496: update target 'vexpress_ca9x4_defconfig' due to: scripts_basic outputmakefile FORCE
   make -f ./scripts/Makefile.build obj=scripts/kconfig vexpress_ca9x4_defconfig
   scripts/Makefile.host:114: update target 'scripts/kconfig/conf.o' due to: FORCE
   scripts/Makefile.lib:228: update target 'scripts/kconfig/zconf.tab.c' due to: FORCE
   scripts/Makefile.lib:219: update target 'scripts/kconfig/zconf.lex.c' due to: FORCE
   scripts/Makefile.host:114: update target 'scripts/kconfig/zconf.tab.o' due to: FORCE
   scripts/Makefile.host:106: update target 'scripts/kconfig/conf' due to: FORCE
   scripts/kconfig/Makefile:128: update target 'vexpress_ca9x4_defconfig' due to: scripts/kconfig/conf
   scripts/kconfig/conf  --defconfig=arch/../configs/vexpress_ca9x4_defconfig Kconfig
   #
   # configuration written to .config
   #
   

3. make target 具体使用的规则

   $make -p vexpress_ca9x4_defconfig  | tee vexpress_ca9x4_defconfig_config
   $cat vexpress_ca9x4_defconfig_config
   vexpress_ca9x4_defconfig: scripts/kconfig/conf
   
    recipe to execute (from 'scripts/kconfig/Makefile', line 128):
   	$(Q)$< $(silent) --defconfig=arch/$(SRCARCH)/configs/$@ $(Kconfig)
   

2. 参考文档

GNU Makefile