OpenWrt – Rev 2

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#!/bin/sh

case $(uname -m) in
        i?86|x86_64)
                if ! grep -q crashkernel /boot/grub/grub.cfg; then
                        mount /boot -o remount,rw
                        sed -i 's/linux.*/& crashkernel=32M@32M/' /boot/grub/grub.cfg
                        mount /boot -o remount,ro
                fi
                ;;
esac