• Masahiro Yamada's avatar
    kconfig: switch to Kconfig · 51148790
    Masahiro Yamada authored
    This commit enables Kconfig.
    Going forward, we use Kconfig for the board configuration.
    mkconfig will never be used. Nor will include/config.mk be generated.
    
    Kconfig must be adjusted for U-Boot because our situation is
    a little more complicated than Linux Kernel.
    We have to generate multiple boot images (Normal, SPL, TPL)
    from one source tree.
    Each image needs its own configuration input.
    
    Usage:
    
    Run "make <board>_defconfig" to do the board configuration.
    
    It will create the .config file and additionally spl/.config, tpl/.config
    if SPL, TPL is enabled, respectively.
    
    You can use "make config", "make menuconfig" etc. to create
    a new .config or modify the existing one.
    
    Use "make spl/config", "make spl/menuconfig" etc. for spl/.config
    and do likewise for tpl/.config file.
    
    The generic syntax of configuration targets for SPL, TPL is:
    
      <target_image>/<config_command>
    
    Here, <target_image> is either 'spl' or 'tpl'
          <config_command> is 'config', 'menuconfig', 'xconfig', etc.
    
    When the configuration is done, run "make".
    (Or "make <board>_defconfig all" will do the configuration and build
    in one time.)
    
    For futher information of how Kconfig works in U-Boot,
    please read the comment block of scripts/multiconfig.py.
    
    By the way, there is another item worth remarking here:
    coexistence of Kconfig and board herder files.
    
    Prior to Kconfig, we used C headers to define a set of configs.
    
    We expect a very long term to migrate from C headers to Kconfig.
    Two different infractructure must coexist in the interim.
    
    In our former configuration scheme, include/autoconf.mk was generated
    for use in makefiles.
    It is still generated under include/, spl/include/, tpl/include/ directory
    for the Normal, SPL, TPL image, respectively.
    Signed-off-by: default avatarMasahiro Yamada <yamada.m@jp.panasonic.com>
    Acked-by: default avatarSimon Glass <sjg@chromium.org>
    51148790
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