晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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#!/usr/bin/bash

# set -x

if [[ "$(uname -m)" == arm* || "$(uname -m)" == aarch64 ]]
then
COMMAND="$1"
KERNEL_VERSION="$2"
#BOOT_DIR_ABS="$3"
#KERNEL_IMAGE="$4"

[ -f /etc/u-boot.conf ] && source /etc/u-boot.conf || true
[ -z "$FIRMWAREDT" ] || FirmwareDT=$FIRMWAREDT

if [[ $FirmwareDT == "True" ]]
then
	# if we want to use firmware DT we remove symlink to current kernel DT
        if [ -h /boot/dtb ]; then
            rm -f /boot/dtb
        fi
	exit 0
fi

# Setup a /boot/dtb -> /boot/dtb-$newest_kernel_version symlink so that
# u-boot can find the correct dtb to load.
#
# If invoked to 'add' a new kernel, find the newest based on `sort`ing
# the kernel versions dtb.  If 'remove', then follow basically the same
# procedure but exclude the version currently being removed.
#
# The theory of operation here is that, while newer kernels may add new
# dtb nodes and fields, as upstreaming hw support for some particular
# device progresses, it should never make backward incompatible changes.
# So it should always be safe to use a newer dtb with an older kernel.

    list_dtb_versions() {
        excluded_version="$1"
        for dtbdir in /boot/dtb-*; do
            dtbver=${dtbdir#*-}
            if [ "$dtbver" != "$excluded_version" ]; then
                echo $dtbver
            fi
        done
    }

    setup_dtb_link() {
        ver=`list_dtb_versions $1 | sort -r --sort=version | head -1`
        if [ -h /boot/dtb ]; then
            rm -f /boot/dtb
        fi
        ln -s dtb-$ver /boot/dtb
    }

    ret=0
    case "$COMMAND" in
        add)
            # If we're adding a kernel we want that version
            if [ -h /boot/dtb ]; then
                rm -f /boot/dtb
            fi
            ln -s dtb-$KERNEL_VERSION /boot/dtb
            ret=$?
            ;;
        remove)
            setup_dtb_link $KERNEL_VERSION
            ret=$?
            ;;
    esac
    exit $ret
else
    # Just exit on non ARM
    exit 0
fi