arch/mips/tools/generic-board-config.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (C) 2017 Imagination Technologies
   4 # Author: Paul Burton <paul.burton@mips.com>
   5 #
   6 # This program is free software; you can redistribute it and/or modify it
   7 # under the terms of the GNU General Public License as published by the
   8 # Free Software Foundation;  either version 2 of the  License, or (at your
   9 # option) any later version.
  10 #
  11 # This script merges configuration fragments for boards supported by the
  12 # generic MIPS kernel. It checks each for requirements specified using
  13 # formatted comments, and then calls merge_config.sh to merge those
  14 # fragments which have no unmet requirements.
  15 #
  16 # An example of requirements in your board config fragment might be:
  17 #
  18 # # require CONFIG_CPU_MIPS32_R2=y
  19 # # require CONFIG_CPU_LITTLE_ENDIAN=y
  20 #
  21 # This would mean that your board is only included in kernels which are
  22 # configured for little endian MIPS32r2 CPUs, and not for example in kernels
  23 # configured for 64 bit or big endian systems.
  24 #
  25
  26 srctree="$1"
  27 objtree="$2"
  28 ref_cfg="$3"
  29 cfg="$4"
  30 boards_origin="$5"
  31 shift 5
  32
  33 # Only print Skipping... lines if the user explicitly specified BOARDS=. In the
  34 # general case it only serves to obscure the useful output about what actually
  35 # was included.
  36 case ${boards_origin} in
  37 "command line")
  38         print_skipped=1
  39         ;;
  40 environment*)
  41         print_skipped=1
  42         ;;
  43 *)
  44         print_skipped=0
  45         ;;
  46 esac
  47
  48 for board in $@; do
  49         board_cfg="${srctree}/arch/mips/configs/generic/board-${board}.config"
  50         if [ ! -f "${board_cfg}" ]; then
  51                 echo "WARNING: Board config '${board_cfg}' not found"
  52                 continue
  53         fi
  54
  55         # For each line beginning with # require, cut out the field following
  56         # it & search for that in the reference config file. If the requirement
  57         # is not found then the subshell will exit with code 1, and we'll
  58         # continue on to the next board.
  59         grep -E '^# require ' "${board_cfg}" | \
  60             cut -d' ' -f 3- | \
  61             while read req; do
  62                 case ${req} in
  63                 *=y)
  64                         # If we require something =y then we check that a line
  65                         # containing it is present in the reference config.
  66                         grep -Eq "^${req}\$" "${ref_cfg}" && continue
  67                         ;;
  68                 *=n)
  69                         # If we require something =n then we just invert that
  70                         # check, considering the requirement met if there isn't
  71                         # a line containing the value =y in the reference
  72                         # config.
  73                         grep -Eq "^${req/%=n/=y}\$" "${ref_cfg}" || continue
  74                         ;;
  75                 *)
  76                         echo "WARNING: Unhandled requirement '${req}'"
  77                         ;;
  78                 esac
  79
  80                 [ ${print_skipped} -eq 1 ] && echo "Skipping ${board_cfg}"
  81                 exit 1
  82         done || continue
  83
  84         # Merge this board config fragment into our final config file
  85         ${srctree}/scripts/kconfig/merge_config.sh \
  86                 -m -O ${objtree} ${cfg} ${board_cfg} \
  87                 | grep -Ev '^(#|Using)'
  88 done