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
26srctree="$1"
27objtree="$2"
28ref_cfg="$3"
29cfg="$4"
30boards_origin="$5"
31shift 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.
36case ${boards_origin} in
37"command line")
38	print_skipped=1
39	;;
40environment*)
41	print_skipped=1
42	;;
43*)
44	print_skipped=0
45	;;
46esac
47
48for 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)'
88done
89