#daily tips# 查看openwrt系统架构：
cat /etc/os-release |grep ARCH

如N1的openwrt显示：
OPENWRT_ARCH="aarch64_cortex-a53"
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全部/etc/os-release 信息：
NAME="OpenWrt"
VERSION="SNAPSHOT"
ID="openwrt"
ID_LIKE="lede openwrt"
PRETTY_NAME="OpenWrt SNAPSHOT"
VERSION_ID="snapshot"
HOME_URL="https://openwrt.org/"
BUG_URL="https://bugs.openwrt.org/"
SUPPORT_URL="https://forum.openwrt.org/"
BUILD_ID="r4710-7dd7a8f96"
OPENWRT_BOARD="armvirt/64"
OPENWRT_ARCH="aarch64_cortex-a53"
OPENWRT_TAINTS="no-all override"
OPENWRT_DEVICE_MANUFACTURER="OpenWrt"
OPENWRT_DEVICE_MANUFACTURER_URL="https://openwrt.org/"
OPENWRT_DEVICE_PRODUCT="Generic"
OPENWRT_DEVICE_REVISION="v0"
OPENWRT_RELEASE="OpenWrt SNAPSHOT r4710-7dd7a8f96"