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

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0-or-later
   3 #
   4 # Copyright (C) 2017 Imagination Technologies
   5 # Author: Paul Burton <paul.burton@mips.com>
   6 #
   7 # This script merges configuration fragments for boards supported by the
   8 # generic MIPS kernel. It checks each for requirements specified using
   9 # formatted comments, and then calls merge_config.sh to merge those
  10 # fragments which have no unmet requirements.
  11 #
  12 # An example of requirements in your board config fragment might be:
  13 #
  14 # # require CONFIG_CPU_MIPS32_R2=y
  15 # # require CONFIG_CPU_LITTLE_ENDIAN=y
  16 #
  17 # This would mean that your board is only included in kernels which are
  18 # configured for little endian MIPS32r2 CPUs, and not for example in kernels
  19 # configured for 64 bit or big endian systems.
  20 #
  21
  22 srctree="$1"
  23 objtree="$2"
  24 ref_cfg="$3"
  25 cfg="$4"
  26 boards_origin="$5"
  27 shift 5
  28
  29 # Only print Skipping... lines if the user explicitly specified BOARDS=. In the
  30 # general case it only serves to obscure the useful output about what actually
  31 # was included.
  32 case ${boards_origin} in
  33 "command line")
  34         print_skipped=1
  35         ;;
  36 environment*)
  37         print_skipped=1
  38         ;;
  39 *)
  40         print_skipped=0
  41         ;;
  42 esac
  43
  44 for board in $@; do
  45         board_cfg="${srctree}/arch/mips/configs/generic/board-${board}.config"
  46         if [ ! -f "${board_cfg}" ]; then
  47                 echo "WARNING: Board config '${board_cfg}' not found"
  48                 continue
  49         fi
  50
  51         # For each line beginning with # require, cut out the field following
  52         # it & search for that in the reference config file. If the requirement
  53         # is not found then the subshell will exit with code 1, and we'll
  54         # continue on to the next board.
  55         grep -E '^# require ' "${board_cfg}" | \
  56             cut -d' ' -f 3- | \
  57             while read req; do
  58                 case ${req} in
  59                 *=y)
  60                         # If we require something =y then we check that a line
  61                         # containing it is present in the reference config.
  62                         grep -Eq "^${req}\$" "${ref_cfg}" && continue
  63                         ;;
  64                 *=n)
  65                         # If we require something =n then we just invert that
  66                         # check, considering the requirement met if there isn't
  67                         # a line containing the value =y in the reference
  68                         # config.
  69                         grep -Eq "^${req/%=n/=y}\$" "${ref_cfg}" || continue
  70                         ;;
  71                 *)
  72                         echo "WARNING: Unhandled requirement '${req}'"
  73                         ;;
  74                 esac
  75
  76                 [ ${print_skipped} -eq 1 ] && echo "Skipping ${board_cfg}"
  77                 exit 1
  78         done || continue
  79
  80         # Merge this board config fragment into our final config file
  81         ${srctree}/scripts/kconfig/merge_config.sh \
  82                 -m -O ${objtree} ${cfg} ${board_cfg} \
  83                 | grep -Ev '^(#|Using)'
  84 done