• Paul Burton's avatar
    MIPS: generic: Allow filtering enabled boards by requirements · 27e0d4b0
    Paul Burton authored
    Up until now when configuring a generic kernel all board config
    fragments have been merged by default unless boards are explicitly
    selected by the user specifying BOARDS=.
    
    In many cases this is sub-optimal, since some boards don't make sense to
    include in some kernels. For example the MIPS SEAD-3 development board
    has only ever been used with 32 bit CPUs, so including support for the
    SEAD-3 in a 64 bit kernel is wasteful.
    
    This patch introduces support for specifying requirements in board
    config fragments, using comments formatted like so:
    
      # require CONFIG_BLA=y
    
    For example the SEAD-3 board could specify that it should only be merged
    for 32 bit kernels using a requirement line like the following:
    
      # require CONFIG_32BIT=y
    
    A new generic-board-config.sh script is introduced to handle selecting
    the board config fragments to merge & calling merge_config.sh to merge
    them. In order to allow requirements to check Kconfig symbols that are
    implicitly selected, rather than explicitly specified by
    generic_defconfig or one of the ISA config fragments, an intermediate
    .config file is saved & used as a reference when checking requirements.
    Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
    Cc: linux-mips@linux-mips.org
    Patchwork: https://patchwork.linux-mips.org/patch/16943/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
    27e0d4b0
Makefile 17.9 KB