LXR linux/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
  22srctree="$1"
  23objtree="$2"
  24ref_cfg="$3"
  25cfg="$4"
  26boards_origin="$5"
  27shift 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.
  32case ${boards_origin} in
  33"command line")
  34        print_skipped=1
  35        ;;
  36environment*)
  37        print_skipped=1
  38        ;;
  39*)
  40        print_skipped=0
  41        ;;
  42esac
  43
  44for 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)'
  84done
  85