OpenWrt挂载SD卡，扩容 /overlay 分区

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opkg install kmod-sdhci kmod-sdhci-mt7620
opkg install block-mount kmod-fs-ext4 e2fsprogs fdisk
block info
mkfs.ext4 /dev/mmcblk0p1
mount /dev/mmcblk0p1 /mnt ; tar -C /overlay -cvf - . | tar -C /mnt -xf - ;
umount /mnt
block detect > /etc/config/fstab; sed -i s/option$'\t'enabled$'\t'\'0\'/option$'\t'enabled$'\t'\'1\'/ /etc/config/fstab; sed -i s#/mnt/mmcblk0p1#/overlay# /etc/config/fstab; cat /etc/config/fstab;
mount /dev/mmcblk0p1 /overlay
df