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27e0d4b051
Up until now when configuring a generic kernel all board config fragments have been merged by default unless boards are explicitly selected by the user specifying BOARDS=. In many cases this is sub-optimal, since some boards don't make sense to include in some kernels. For example the MIPS SEAD-3 development board has only ever been used with 32 bit CPUs, so including support for the SEAD-3 in a 64 bit kernel is wasteful. This patch introduces support for specifying requirements in board config fragments, using comments formatted like so: # require CONFIG_BLA=y For example the SEAD-3 board could specify that it should only be merged for 32 bit kernels using a requirement line like the following: # require CONFIG_32BIT=y A new generic-board-config.sh script is introduced to handle selecting the board config fragments to merge & calling merge_config.sh to merge them. In order to allow requirements to check Kconfig symbols that are implicitly selected, rather than explicitly specified by generic_defconfig or one of the ISA config fragments, an intermediate .config file is saved & used as a reference when checking requirements. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/16943/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
91 lines
2.6 KiB
Bash
Executable File
91 lines
2.6 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (C) 2017 Imagination Technologies
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# Author: Paul Burton <paul.burton@imgtec.com>
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2 of the License, or (at your
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# option) any later version.
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#
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# This script merges configuration fragments for boards supported by the
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# generic MIPS kernel. It checks each for requirements specified using
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# formatted comments, and then calls merge_config.sh to merge those
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# fragments which have no unmet requirements.
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#
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# An example of requirements in your board config fragment might be:
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#
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# # require CONFIG_CPU_MIPS32_R2=y
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# # require CONFIG_CPU_LITTLE_ENDIAN=y
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#
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# This would mean that your board is only included in kernels which are
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# configured for little endian MIPS32r2 CPUs, and not for example in kernels
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# configured for 64 bit or big endian systems.
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#
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srctree="$1"
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objtree="$2"
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ref_cfg="$3"
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cfg="$4"
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boards_origin="$5"
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shift 5
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cd "${srctree}"
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# Only print Skipping... lines if the user explicitly specified BOARDS=. In the
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# general case it only serves to obscure the useful output about what actually
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# was included.
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case ${boards_origin} in
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"command line")
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print_skipped=1
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;;
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environment*)
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print_skipped=1
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;;
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*)
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print_skipped=0
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;;
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esac
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for board in $@; do
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board_cfg="arch/mips/configs/generic/board-${board}.config"
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if [ ! -f "${board_cfg}" ]; then
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echo "WARNING: Board config '${board_cfg}' not found"
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continue
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fi
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# For each line beginning with # require, cut out the field following
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# it & search for that in the reference config file. If the requirement
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# is not found then the subshell will exit with code 1, and we'll
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# continue on to the next board.
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grep -E '^# require ' "${board_cfg}" | \
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cut -d' ' -f 3- | \
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while read req; do
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case ${req} in
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*=y)
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# If we require something =y then we check that a line
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# containing it is present in the reference config.
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grep -Eq "^${req}\$" "${ref_cfg}" && continue
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;;
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*=n)
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# If we require something =n then we just invert that
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# check, considering the requirement met if there isn't
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# a line containing the value =y in the reference
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# config.
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grep -Eq "^${req/%=n/=y}\$" "${ref_cfg}" || continue
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;;
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*)
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echo "WARNING: Unhandled requirement '${req}'"
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;;
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esac
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[ ${print_skipped} -eq 1 ] && echo "Skipping ${board_cfg}"
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exit 1
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done || continue
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# Merge this board config fragment into our final config file
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./scripts/kconfig/merge_config.sh \
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-m -O ${objtree} ${cfg} ${board_cfg} \
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| grep -Ev '^(#|Using)'
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done
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