1#!/bin/sh
2#
3# Copyright (C) 2017 Imagination Technologies
4# Author: Paul Burton <paul.burton@imgtec.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
26srctree="$1"
27objtree="$2"
28ref_cfg="$3"
29cfg="$4"
30boards_origin="$5"
31shift 5
32
33cd "${srctree}"
34
35# Only print Skipping... lines if the user explicitly specified BOARDS=. In the
36# general case it only serves to obscure the useful output about what actually
37# was included.
38case ${boards_origin} in
39"command line")
40	print_skipped=1
41	;;
42environment*)
43	print_skipped=1
44	;;
45*)
46	print_skipped=0
47	;;
48esac
49
50for board in $@; do
51	board_cfg="arch/mips/configs/generic/board-${board}.config"
52	if [ ! -f "${board_cfg}" ]; then
53		echo "WARNING: Board config '${board_cfg}' not found"
54		continue
55	fi
56
57	# For each line beginning with # require, cut out the field following
58	# it & search for that in the reference config file. If the requirement
59	# is not found then the subshell will exit with code 1, and we'll
60	# continue on to the next board.
61	grep -E '^# require ' "${board_cfg}" | \
62	    cut -d' ' -f 3- | \
63	    while read req; do
64		case ${req} in
65		*=y)
66			# If we require something =y then we check that a line
67			# containing it is present in the reference config.
68			grep -Eq "^${req}\$" "${ref_cfg}" && continue
69			;;
70		*=n)
71			# If we require something =n then we just invert that
72			# check, considering the requirement met if there isn't
73			# a line containing the value =y in the reference
74			# config.
75			grep -Eq "^${req/%=n/=y}\$" "${ref_cfg}" || continue
76			;;
77		*)
78			echo "WARNING: Unhandled requirement '${req}'"
79			;;
80		esac
81
82		[ ${print_skipped} -eq 1 ] && echo "Skipping ${board_cfg}"
83		exit 1
84	done || continue
85
86	# Merge this board config fragment into our final config file
87	./scripts/kconfig/merge_config.sh \
88		-m -O ${objtree} ${cfg} ${board_cfg} \
89		| grep -Ev '^(#|Using)'
90done
91