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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-or-later
#
# Copyright (C) 2017 Imagination Technologies
# Author: Paul Burton <paul.burton@mips.com>
#
# This script merges configuration fragments for boards supported by the
# generic MIPS kernel. It checks each for requirements specified using
# formatted comments, and then calls merge_config.sh to merge those
# fragments which have no unmet requirements.
#
# An example of requirements in your board config fragment might be:
#
# # require CONFIG_CPU_MIPS32_R2=y
# # require CONFIG_CPU_LITTLE_ENDIAN=y
#
# This would mean that your board is only included in kernels which are
# configured for little endian MIPS32r2 CPUs, and not for example in kernels
# configured for 64 bit or big endian systems.
#
srctree="$1"
objtree="$2"
ref_cfg="$3"
cfg="$4"
boards_origin="$5"
shift 5
# Only print Skipping... lines if the user explicitly specified BOARDS=. In the
# general case it only serves to obscure the useful output about what actually
# was included.
case ${boards_origin} in
"command line")
print_skipped=1
;;
environment*)
print_skipped=1
;;
*)
print_skipped=0
;;
esac
for board in $@; do
board_cfg="${srctree}/arch/mips/configs/generic/board-${board}.config"
if [ ! -f "${board_cfg}" ]; then
echo "WARNING: Board config '${board_cfg}' not found"
continue
fi
# For each line beginning with # require, cut out the field following
# it & search for that in the reference config file. If the requirement
# is not found then the subshell will exit with code 1, and we'll
# continue on to the next board.
grep -E '^# require ' "${board_cfg}" | \
cut -d' ' -f 3- | \
while read req; do
case ${req} in
*=y)
# If we require something =y then we check that a line
# containing it is present in the reference config.
grep -Eq "^${req}\$" "${ref_cfg}" && continue
;;
*=n)
# If we require something =n then we just invert that
# check, considering the requirement met if there isn't
# a line containing the value =y in the reference
# config.
grep -Eq "^${req/%=n/=y}\$" "${ref_cfg}" || continue
;;
*)
echo "WARNING: Unhandled requirement '${req}'"
;;
esac
[ ${print_skipped} -eq 1 ] && echo "Skipping ${board_cfg}"
exit 1
done || continue
# Merge this board config fragment into our final config file
${srctree}/scripts/kconfig/merge_config.sh \
-m -O ${objtree} ${cfg} ${board_cfg} \
| grep -Ev '^(#|Using)'
done
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