uboot图形化配置浅析

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- mx6ull_alientek_emmc_defconfig
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- menuconfig

 %config: scripts_basic outputmakefile FORCE
 $(Q)$(MAKE) $(build)=scripts/kconfig $@

@ make -f ./scripts/Makefile.build obj=scripts/kconfig menuconfig

 menuconfig: $(obj)/mconf
 $< $(silent) $(Kconfig)

menuconfig: scripts/kconfig/mconf
scripts/kconfig/mconf Kconfig

mainmenu "U-Boot $UBOOTVERSION Configuration"

source "xxx/Kconfig" //xxx 为具体的目录名，相对路径

menu "General setup"

config LOCALVERSION
	string "Local version - append to U-Boot release"
	help
	  Append an extra string to the end of your U-Boot version.
	  This will show up on your boot log, for example.
	  The string you set here will be appended after the contents of
	  any files with a filename matching localversion* in your
	  object and source tree, in that order.  Your total string can
	  be a maximum of 64 characters.

config LOCALVERSION_AUTO
	bool "Automatically append version information to the version string"
	default y
	help
	  This will try to automatically determine if the current tree is a
	  release tree by looking for git tags that belong to the current
	  top of tree revision.

	  A string of the format -gxxxxxxxx will be added to the localversion
	  if a git-based tree is found.  The string generated by this will be
	  appended after any matching localversion* files, and after the value
	  set in CONFIG_LOCALVERSION.

	  (The actual string used here is the first eight characters produced
	  by running the command:

	    $ git rev-parse --verify HEAD

	  which is done within the script "scripts/setlocalversion".)

config CC_OPTIMIZE_FOR_SIZE
	bool "Optimize for size"
	default y
	help
	  Enabling this option will pass "-Os" instead of "-O2" to gcc
	  resulting in a smaller U-Boot image.

	  This option is enabled by default for U-Boot.

config SYS_MALLOC_F
	bool "Enable malloc() pool before relocation"
	default y if DM
	help
	  Before relocation memory is very limited on many platforms. Still,
	  we can provide a small malloc() pool if needed. Driver model in
	  particular needs this to operate, so that it can allocate the
	  initial serial device and any others that are needed.

config SYS_MALLOC_F_LEN
	hex "Size of malloc() pool before relocation"
	depends on SYS_MALLOC_F
	default 0x400
	help
	  Before relocation memory is very limited on many platforms. Still,
	  we can provide a small malloc() pool if needed. Driver model in
	  particular needs this to operate, so that it can allocate the
	  initial serial device and any others that are needed.

menuconfig EXPERT
	bool "Configure standard U-Boot features (expert users)"
	default y
	help
	  This option allows certain base U-Boot options and settings
	  to be disabled or tweaked. This is for specialized
	  environments which can tolerate a "non-standard" U-Boot.
	  Only use this if you really know what you are doing.

if EXPERT
	config SYS_MALLOC_CLEAR_ON_INIT
	bool "Init with zeros the memory reserved for malloc (slow)"
	default y
	help
	  This setting is enabled by default. The reserved malloc
	  memory is initialized with zeros, so first malloc calls
	  will return the pointer to the zeroed memory. But this
	  slows the boot time.

	  It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
	  value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
	  Then the boot time can be significantly reduced.
	  Warning:
	  When disabling this, please check if malloc calls, maybe
	  should be replaced by calloc - if expects zeroed memory.
endif
endmenu		# General setup

config SYS_GENERIC_BOARD
	bool
	depends on HAVE_GENERIC_BOARD

choice
	prompt "Architecture select"
	default SANDBOX

config ARC
	bool "ARC architecture"
	select HAVE_PRIVATE_LIBGCC
	select HAVE_GENERIC_BOARD
	select SYS_GENERIC_BOARD
	select SUPPORT_OF_CONTROL
endchoice

 menuconfig MODULES 
  bool "menu_name" 3 if MODULES
  ...
 endif # MODULES